Faculty Profiles - OKAZAKI RYUJI

Information

写真a

OKAZAKI RYUJI

Organization

Faculty of Science Department of Earth and Planetary Sciences Associate Professor
School of Sciences Department of Earth and Planetary Sciences（Joint Appointment）
Graduate School of Sciences Department of Earth and Planetary Sciences（Joint Appointment）

Profile

Meteorites and cosmic dusts are sutdied in respects of petrological/mineralogical features and chemical/isotopical compositions. The goal of the studies is to understand the origin and evolution history of the solar system materials.

Homepage

http://jupiter.geo.kyushu-u.ac.jp/
Department of Earth and Planetary Sciences
Faculty of Sciences
Kyushu University

Degree

Doctor of Science

Research Interests・Research Keywords

Research theme：Noble gases in Martian meteorites

Keyword：Noble gas, Martian meteorite

Research period： 2024.4 - 2030.4
Research theme：Understanding of the condition and settings of chemical reaction in the interstellar space.

Keyword：interstellar space, organic matter, gas, ice

Research period： 2020.11 - 2025.3
Research theme：Initial analysis of the Hayabusa2 return sample

Keyword：Hayabusa2

Research period： 2019.4 - 2022.6
Research theme：Recovery of the re-entry capsule of the Hayabusa2 spacecraft.

Keyword：Hayabusa2

Research period： 2018.4 - 2021.3
Research theme：Pu-Xe isochron dating for eucrties

Keyword：eucrite, isochoron, Pu-Xe

Research period： 2017.10 - 2019.9
Research theme：Pre-compaction ages for Ca-Al-rich refractory inclusions (CAIs) in chondrites

Keyword：CAIs, pre-compaction age, solar nebula

Research period： 2011.4 - 2014.3
Research theme：Development of Hayabusa-2

Keyword：Hayabusa-2

Research period： 2010.9 - 2014.3
Research theme：Noble gas analysis for an asteroid sample from Itokawa

Keyword：Hayabusa, Itokawa, asteroid, noble gas, solar system

Research period： 2010.8 - 2013.3
Research theme：Interaction between minerals, water, and organic materials in the early solar system.

Keyword：minerals, water, organic materials, the early solar system.

Research period： 2010.4 - 2014.3
Research theme：A study on the chemical fractionation in the solar nebula based on chemistry, mineralogy, and isotopic compositions of the chondrite matrix.

Keyword：chondrite, matrix, chemical fractionation, solar nebula

Research period： 2007.4
Research theme：Chemistry, mineralogy, and isotopic characteristics of crystalline Antarctic micrometeorites.

Keyword：micrometeorites, comet, asteroids, meteorites, crystalline, noble gas, oxygen, rare earth elements

Research period： 2006.4 - 2008.5
Research theme：Origin and history of the reduced material in the solar nebula

Keyword：solar nebula, reduced material, enstatite chondrites, noble gas, oxygen, rare earth elements

Research period： 2001.4 - 2006.12

Papers

The noble gas and nitrogen relationship between Ryugu and carbonaceous chondrites Invited Reviewed International journal

Geochimica et Cosmochimica Acta 345 62 - 74 2023.5 （ ISSN:0016-7037 eISSN:1872-9533 ）

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DOI： 10.1016/j.gca.2023.01.020

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Macromolecular organic matter in samples of the asteroid (162173) Ryugu Reviewed International journal

Science 2023.3

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Soluble organic molecules in samples of the carbonaceous asteroid (162173) Ryugu Invited Reviewed International journal

Science 379 ( 6634 ) 789 - + 2023.3 （ ISSN:0036-8075 eISSN:1095-9203 ）

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DOI： 10.1126/science.abn9033

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Formation and evolution of carbonaceous asteroid Ryugu: Direct evidence from returned samples Reviewed International journal

Science 379 ( 6634 ) 787 - + 2023.3 （ ISSN:0036-8075 eISSN:1095-9203 ）

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DOI： 10.1126/science.abn8671

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Samples returned from the asteroid Ryugu are similar to Ivuna-type carbonaceous meteorites Reviewed International journal

Science 379 ( 6634 ) 786 - + 2023.3 （ ISSN:0036-8075 eISSN:1095-9203 ）

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DOI： 10.1126/science.abn7850

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Noble gases and nitrogen in samples of asteroid Ryugu record its volatile sources and recent surface evolution Reviewed International journal

Science 379 ( 6634 ) 788 - U52 2023.3 （ ISSN:0036-8075 eISSN:1095-9203 ）

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DOI： 10.1126/science.abo0431

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A dehydrated space-weathered skin cloaking the hydrated interior of Ryugu Reviewed International journal

Noguchi Takaaki, Matsumoto Toru, Miyake Akira, Igami Yohei, Haruta Mitsutaka, Saito Hikaru, Hata Satoshi, Seto Yusuke, Miyahara Masaaki, Tomioka Naotaka, Ishii Hope A., Bradley John P., Ohtaki Kenta K., Dobrică Elena, Leroux Hugues, Le Guillou Corentin, Jacob Damien, de la Peña Francisco, Laforet Sylvain, Marinova Maya, Langenhorst Falko, Harries Dennis, Beck Pierre, Phan Thi H. V., Rebois Rolando, Abreu Neyda M., Gray Jennifer, Zega Thomas, Zanetta Pierre-M., Thompson Michelle S., Stroud Rhonda, Burgess Kate, Cymes Brittany A., Bridges John C., Hicks Leon, Lee Martin R., Daly Luke, Bland Phil A., Zolensky Michael E., Frank David R., Martinez James, Tsuchiyama Akira, Yasutake Masahiro, Matsuno Junya, Okumura Shota, Mitsukawa Itaru, Uesugi Kentaro, Uesugi Masayuki, Takeuchi Akihisa, Sun Mingqi, Enju Satomi, Takigawa Aki, Michikami Tatsuhiro, Nakamura Tomoki, Matsumoto Megumi, Nakauchi Yusuke, Abe Masanao, Arakawa Masahiko, Fujii Atsushi, Hayakawa Masahiko, Hirata Naru, Hirata Naoyuki, Honda Rie, Honda Chikatoshi, Hosoda Satoshi, Iijima Yu-ichi, Ikeda Hitoshi, Ishiguro Masateru, Ishihara Yoshiaki, Iwata Takahiro, Kawahara Kousuke, Kikuchi Shota, Kitazato Kohei, Matsumoto Koji, Matsuoka Moe, Mimasu Yuya, Miura Akira, Morota Tomokatsu, Nakazawa Satoru, Namiki Noriyuki, Noda Hirotomo, Noguchi Rina, Ogawa Naoko, Ogawa Kazunori, Okada Tatsuaki, Okamoto Chisato, Ono Go, Ozaki Masanobu, Saiki Takanao, Sakatani Naoya, Sawada Hirotaka, Senshu Hiroki, Shimaki Yuri, Shirai Kei, Sugita Seiji, Takei Yuto, Takeuchi Hiroshi, Tanaka Satoshi, Tatsumi Eri, Terui Fuyuto, Tsukizaki Ryudo, Wada Koji, Yamada Manabu, Yamada Tetsuya, Yamamoto Yukio, Yano Hajime, Yokota Yasuhiro, Yoshihara Keisuke, Yoshikawa Makoto, Yoshikawa Kent, Fukai Ryohta, Furuya Shizuho, Hatakeda Kentaro, Hayashi Tasuku, Hitomi Yuya, Kumagai Kazuya, Miyazaki Akiko, Nakato Aiko, Nishimura Masahiro, Soejima Hiromichi, Suzuki Ayako I., Usui Tomohiro, Yada Toru, Yamamoto Daiki, Yogata Kasumi, Yoshitake Miwa, Connolly Harold C., Lauretta Dante S., Yurimoto Hisayoshi, Nagashima Kazuhide, Kawasaki Noriyuki, Sakamoto Naoya, Okazaki Ryuji, Yabuta Hikaru, Naraoka Hiroshi, Sakamoto Kanako, Tachibana Shogo, Watanabe Sei-ichiro, Tsuda Yuichi

Nature Astronomy 7 ( 2 ) 170 - 181 2023.2 （ ISSN:2397-3366 eISSN:23973366 ）

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Without a protective atmosphere, space-exposed surfaces of airless Solar System bodies gradually experience an alteration in composition, structure and optical properties through a collective process called space weathering. The return of samples from near-Earth asteroid (162173) Ryugu by Hayabusa2 provides the first opportunity for laboratory study of space-weathering signatures on the most abundant type of inner solar system body: a C-type asteroid, composed of materials largely unchanged since the formation of the Solar System. Weathered Ryugu grains show areas of surface amorphization and partial melting of phyllosilicates, in which reduction from Fe³⁺ to Fe²⁺ and dehydration developed. Space weathering probably contributed to dehydration by dehydroxylation of Ryugu surface phyllosilicates that had already lost interlayer water molecules and to weakening of the 2.7 µm hydroxyl (–OH) band in reflectance spectra. For C-type asteroids in general, this indicates that a weak 2.7 µm band can signify space-weathering-induced surface dehydration, rather than bulk volatile loss.

DOI： 10.1038/s41550-022-01841-6

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Soluble Sulfur-Bearing Organic Compounds in Carbonaceous Meteorites: Implications for Chemical Evolution in Primitive Asteroids Reviewed International journal

@Naraoka, Hiroshi; Hashiguchi, Minako; @Okazaki, Ryuji

ACS Earth and Space Chemistry 7 ( 1 ) 41 - 48 2023.1 （ ISSN:2472-3452 ）

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DOI： 10.1021/acsearthspacechem.2c00157

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Methods and tools for handling, transportation, weighing, and pelletization applied to the initial analysis of volatile components in the Hayabusa2 samples Reviewed International journal

@Okazaki, Ryuji; @Yamanouchi, Shinji; @Shimada, Kazuhiko; @Baba, Atsushi; @Kitajima, Fumio; Yada, Toru

Earth, Planets and Space 74 ( 1 ) 2022.12 （ ISSN:13438832 eISSN:1880-5981 ）

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DOI： 10.1186/s40623-022-01747-7

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The GAs Extraction and Analyses system (GAEA) for immediate extraction and measurements of volatiles in the Hayabusa2 sample container Invited Reviewed International journal

Miura, Yayoi N.; @Okazaki, Ryuji; Takano, Yoshinori; Sakamoto, Kanako; Tachibana, Shogo; Yamada, Keita; Sakai, Saburo; Sawada, Hirotaka

Earth, Planets and Space 74 ( 1 ) 2022.12 （ ISSN:13438832 eISSN:1880-5981 ）

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DOI： 10.1186/s40623-022-01638-x

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Antarctic micrometeorite composed of CP and CS IDP-like material: A micro-breccia originated from a partially ice-melted comet-like small body Reviewed International journal

Noguchi, Takaaki; Matsumoto, Rikako; Yabuta, Hikaru; Kobayashi, Hanae; Miyake, Akira; Naraoka, Hiroshi; @Okazaki, Ryuji; Imae, Naoya; Yamaguchi, Akira; Kilcoyne, A. L. David; Takeichi, Yasuo; Takahashi, Yoshio

Meteoritics & Planetary Science 57 ( 11 ) 2042 - 2062 2022.11 （ ISSN:1086-9379 eISSN:1945-5100 ）

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DOI： 10.1111/maps.13919

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First asteroid gas sample delivered by the Hayabusa2 mission: A treasure box from Ryugu Reviewed International journal

Okazaki Ryuji, Miura Yayoi N., Takano Yoshinori, Sawada Hirotaka, Sakamoto Kanako, Yada Toru, Yamada Keita, Kawagucci Shinsuke, Matsui Yohei, Hashizume Ko, Ishida Akizumi, Broadley Michael W., Marty Bernard, Byrne David, Füri Evelyn, Meshik Alex, Pravdivtseva Olga, Busemann Henner, Riebe My E.I., Gilmour Jamie, Park Jisun, Bajo Ken-ichi, Righter Kevin, Sakai Saburo, Sekimoto Shun, Kitajima Fumio, Crowther Sarah A., Iwata Naoyoshi, Shirai Naoki, Ebihara Mitsuru, Yokochi Reika, Nishiizumi Kunihiko, Nagao Keisuke, Lee Jong Ik, Clay Patricia, Kano Akihiro, Caffee Marc W., Uemura Ryu, Inagaki Makoto, Krietsch Daniela, Maden Colin, Yamamoto Mizuki, Fawcett Lydia, Lawton Thomas, Nakamura Tomoki, Naraoka Hiroshi, Noguchi Takaaki, Yabuta Hikaru, Yurimoto Hisayoshi, Tsuda Yuichi, Watanabe Sei-ichiro, Abe Masanao, Arakawa Masahiko, Fujii Atsushi, Hayakawa Masahiko, Hirata Naoyuki, Hirata Naru, Honda Rie, Honda Chikatoshi, Hosoda Satoshi, Iijima Yu-ichi, Ikeda Hitoshi, Ishiguro Masateru, Ishihara Yoshiaki, Iwata Takahiro, Kawahara Kosuke, Kikuchi Shota, Kitazato Kohei, Matsumoto Koji, Matsuoka Moe, Michikami Tatsuhiro, Mimasu Yuya, Miura Akira, Morota Tomokatsu, Nakazawa Satoru, Namiki Noriyuki, Noda Hirotomo, Noguchi Rina, Ogawa Naoko, Ogawa Kazunori, Okada Tatsuaki, Okamoto Chisato, Ono Go, Ozaki Masanobu, Saiki Takanao, Sakatani Naoya, Senshu Hiroki, Shimaki Yuri, Shirai Kei, Sugita Seiji, Takei Yuto, Takeuchi Hiroshi, Tanaka Satoshi, Tatsumi Eri, Terui Fuyuto, Tsukizaki Ryudo, Wada Koji, Yamada Manabu, Yamada Tetsuya, Yamamoto Yukio, Yano Hajime, Yokota Yasuhiro, Yoshihara Keisuke, Yoshikawa Makoto, Yoshikawa Kent, Furuya Shizuho, Hatakeda Kentaro, Hayashi Tasuku, Hitomi Yuya, Kumagai Kazuya, Miyazaki Akiko, Nakato Aiko, Nishimura Masahiro, Soejima Hiromichi, Iwamae Ayako, Yamamoto Daiki, Yogata Kasumi, Yoshitake Miwa, Fukai Ryota, Usui Tomohiro, Ireland Trevor, Connolly Harold C., Lauretta Dante S., Tachibana Shogo

Science Advances 8 ( 46 ) eabo7239 2022.11 （ ISSN:2375-2548 eISSN:23752548 ）

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The Hayabusa2 spacecraft returned to Earth from the asteroid 162173 Ryugu on 6 December 2020. One day after the recovery, the gas species retained in the sample container were extracted and measured on-site and stored in gas collection bottles. The container gas consists of helium and neon with an extraterrestrial ³He/⁴He and ²⁰Ne/²²Ne ratios, along with some contaminant terrestrial atmospheric gases. A mixture of solar and Earth’s atmospheric gas is the best explanation for the container gas composition. Fragmentation of Ryugu grains within the sample container is discussed on the basis of the estimated amount of indigenous He and the size distribution of the recovered Ryugu grains. This is the first successful return of gas species from a near-Earth asteroid.

DOI： 10.1126/sciadv.abo7239

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Pebbles and sand on asteroid (162173) Ryugu: In situ observation and particles returned to Earth Reviewed International journal

Tachibana, S.; Sawada, H.; Okazaki, R.; Takano, Y.; Sakamoto, K.; Miura, Y. N.; Okamoto, C.; Yano, H.; Yamanouchi, S.; Michel, P.; Zhang, Y.; Schwartz, S.; Thuillet, F.; Yurimoto, H.; Nakamura, T.; Noguchi, T.; Yabuta, H.; Naraoka, H.; Tsuchiyama, A.; Imae, N.; Kurosawa, K.; Nakamura, A. M.; Ogawa, K.; Sugita, S.; Morota, T.; Honda, R.; Kameda, S.; Tatsumi, E.; Cho, Y.; Yoshioka, K.; Yokota, Y.; Hayakawa, M.; Matsuoka, M.; Sakatani, N.; Yamada, M.; Kouyama, T.; Suzuki, H.; Honda, C.; Yoshimitsu, T.; Kubota, T.; Demura, H.; Yada, T.; Nishimura, M.; Yogata, K.; Nakato, A.; Yoshitake, M.; Suzuki, A. I.; Furuya, S.; Hatakeda, K.; Miyazaki, A.; Kumagai, K.; Okada, T.; Abe, M.; Usui, T.; Ireland, T. R.; Fujimoto, M.; Yamada, T.; Arakawa, M.; Connolly, H. C.; Fujii, A.; Hasegawa, S.; Hirata, N.; Hirata, N.; Hirose, C.; Hosoda, S.; Iijima, Y.; Ikeda, H.; Ishiguro, M.; Ishihara, Y.; Iwata, T.; Kikuchi, S.; Kitazato, K.; Lauretta, D. S.; Libourel, G.; Marty, B.; Matsumoto, K.; Michikami, T.; Mimasu, Y.; Miura, A.; Mori, O.; Nakamura-Messenger, K.; Namiki, N.; Nguyen, A. N.; Nittler, L. R.; Noda, H.; Noguchi, R.; Ogawa, N.; Ono, G.; Ozaki, M.; Senshu, H.; Shimada, T.; Shimaki, Y.; Shirai, K.; Soldini, S.; Takahashi, T.; Takei, Y.; Takeuchi, H.; Tsukizaki, R.; Wada, K.; Yamamoto, Y.; Yoshikawa, K.; Yumoto, K.; Zolensky, M. E.; Nakazawa, S.; Terui, F.; Tanaka, S.; Saiki, T.; Yoshikawa, M.; Watanabe, S.; Tsuda, Y.

Science 375 ( 6584 ) 1011 - + 2022.3 （ ISSN:0036-8075 eISSN:1095-9203 ）

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DOI： 10.1126/science.abj8624

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Environmental assessment in the prelaunch phase of Hayabusa2 for safety declaration of returned samples from the asteroid (162173) Ryugu: background monitoring and risk management during development of the sampler system Reviewed International journal

Sakamoto, Kanako; Takano, Yoshinori; Sawada, Hirotaka; @Okazaki, Ryuji; Noguchi, Takaaki; Uesugi, Masayuki; Yano, Hajime; Yada, Toru; Abe, Masanao; Tachibana, Shogo; Hayabusa2 Project Team

Earth, Planets and Space 74 ( 1 ) 2021.12 （ ISSN:13438832 eISSN:1880-5981 ）

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DOI： 10.1186/s40623-022-01628-z

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Hayabusa-returned sample curation in the Planetary Material Sample Curation Facility of JAXA. Reviewed International journal

T. Yada, A. Fujimura, M. Abe, T. Nakamura, T. Noguchi, Okazaki Ryuji, K. Nagao,, Y. Ishibashi,, K. Shirai, M. E. Zolensky, S. Sandford,, T. Okada, M. Uesugi, Y. Karouji, M. Ogawa, S. Yakame, M. Ueno, T. Mukai, M. Yoshikawa

Meteoritics & Planetary Science 49 ( 2 ) 135 - 153 2014.2

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DOI： 10.1111/maps.12027
Space weathered rims found on the surfaces of the Itokawa dust particles. Reviewed International journal

T. Noguchi, M. Kimura, T. Hashimoto, M. Konno, T. Nakamura, M. E. Zolensky,, M. Tanaka, Okazaki Ryuji, A. Tsuchiyama, A. Nakato, T. Ogami, H. Ishida, R. Sagae, S. Tsujimoto, T. Matsumoto, J. Matsuno, A. Fujimura, M. Abe, T. Yada

Meteoritics & Planetary Science 49 ( 2 ) 188 - 214 2013.5

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Radar-Enabled Recovery of the Sutter's Mill Meteorite, a Carbonaceous Chondrite Regolith Breccia Reviewed International journal

Science 338 ( 6114 ) 2012.12

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DOI： 10.1126/science.1227163
Construction of a newly designed small-size mass spectrometer for helium isotope analysis: Toward the continuous monitoring of 3He/4He ratios in natural fluids. Reviewed International journal

K. Bajo, H. Sumino, M. Toyoda, Okazaki Ryuji, T. Osawa, M. Ishihara, I. Katakuse, K. Notsu, G. Igarashi, K. Nagao

Mass Spectrometry DOI:10.5702 2012.11

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DOI： 10.5702
Irradiation history of Itokawa regolith material deduced from noble gases in the Hayabusa samples. Reviewed International journal

K. Nagao, R. Okazaki, T. Nakamura, Y. N. Miura, T. Osawa, K. Bajo, S. Matsuda, M. Ebihara, T. R. Ireland, F. Kitajima, H. Naraoka, T. Noguchi, A. Tsuchiyama, H. Yurimoto, M. E. Zolensky, M. Uesugi, K. Shirai, M. Abe, T. Yada, Y. Ishibashi, A. Fujimura, T. Mukai, M. Ueno, T. Okada, M. Yoshikawa, J. Kawaguchi.

Science 333 2011.8

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Incipient space weathering observed on the surface of Itokawa dust particles. Reviewed International journal

T. Noguchi, T. Nakamura, M. Kimura, M. E. Zolensky, M. Tanaka, T. Hashimoto, M. Konno, A. Nakato, T. Ogami, A. Fujimura, M. Abe, T. Yada, T. Mukai, M. Ueno, T. Okada, K. Shirai, Y. Ishibashi, R. Okazaki.

Science 333 2011.8

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Noble gases in enstatite chondrites released by stepped crushing and heating Reviewed International journal

Ryuji Okazaki, Nobuo Takaoka, Keisuke Nagao, Tomoki Nakamura

Meteoritics & Planetary Science 45 ( 3 ) 339 - 360 2010.3

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DOI： 10.1111/j.1945-5100.2010.01025.x
Noble gases in ureilites released by crushing Reviewed International journal

Okazaki Ryuji, Tomoki Nakamura, N. Takaoka, K. Nagao

Meteoritics and Planetary Sciences 38 ( 5 ) 767 - 781 2003.5

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Noble gas signatures of Antarctic nakhlites, Yamato (Y) 000593, Y000749, and Y000802 Reviewed International journal

Okazaki Ryuji, K. Nagao, N. Imae, H. Kojima

Antarctic Meteorite Research 16 58 - 79 2003.3

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Noble-gas-rich chondrules in an enstatite meteorite Reviewed International journal

Okazaki Ryuji, N. Takaoka, K. Nagao, Minoru Sekiya, Tomoki Nakamura

Nature 412 ( 6849 ) 795 - 798 2001.8

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DOI： 10.1038/35090520
Cosmic-ray exposure ages of enstatite chondrites Reviewed International journal

Okazaki Ryuji, N. Takaoka, T. Nakamura, K. Nagao

Antarctic Meteorite Research 13 153 - 169 1999.3

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Breunnerite grain and magnesium isotope chemistry reveal cation partitioning during aqueous alteration of asteroid Ryugu.

Yoshimura T, Araoka D, Naraoka H, Sakai S, Ogawa NO, Yurimoto H, Morita M, Onose M, Yokoyama T, Bizzarro M, Tanaka S, Ohkouchi N, Koga T, Dworkin JP, Nakamura T, Noguchi T, Okazaki R, Yabuta H, Sakamoto K, Yada T, Nishimura M, Nakato A, Miyazaki A, Yogata K, Abe M, Okada T, Usui T, Yoshikawa M, Saiki T, Tanaka S, Terui F, Nakazawa S, Watanabe SI, Tsuda Y, Tachibana S, Takano Y

Nature communications 15 ( 1 ) 6809 2024.9

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DOI： 10.1038/s41467-024-50814-y

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Variations of organic functional chemistry in carbonaceous matter from the asteroid 162173 Ryugu.

De Gregorio B, Cody GD, Stroud RM, David Kilcoyne AL, Sandford S, Le Guillou C, Nittler LR, Barosch J, Yabuta H, Martins Z, Kebukawa Y, Okumura T, Hashiguchi M, Yamashita S, Takeichi Y, Takahashi Y, Wakabayashi D, Engrand C, Bejach L, Bonal L, Quirico E, Remusat L, Duprat J, Verdier-Paoletti M, Mostefaoui S, Komatsu M, Mathurin J, Dazzi A, Deniset-Besseau A, Dartois E, Tamenori Y, Suga H, Montagnac G, Kamide K, Shigenaka M, Matsumoto M, Enokido Y, Yoshikawa M, Saiki T, Tanaka S, Terui F, Nakazawa S, Usui T, Abe M, Okada T, Yada T, Nishimura M, Nakato A, Miyazaki A, Yogata K, Yurimoto H, Nakamura T, Noguchi T, Okazaki R, Naraoka H, Sakamoto K, Tachibana S, Watanabe SI, Tsuda Y

Nature communications 15 ( 1 ) 7488 2024.8

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DOI： 10.1038/s41467-024-51731-w

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Pyrrhotites in asteroid 162173 Ryugu: Records of the initial changes on their surfaces with aqueous alteration

Yui, H; Urashima, SH; Onose, M; Morita, M; Komatani, S; Nakai, I; Abe, Y; Terada, Y; Homma, H; Motomura, K; Ichida, K; Yokoyama, T; Nagashima, K; Aléon, J; Alexander, CMOD; Amari, S; Amelin, Y; Bajo, K; Bizzarro, M; Bouvier, A; Carlson, RW; Chaussidon, M; Choi, BG; Dauphas, N; Davis, AM; Fujiya, W; Fukai, R; Gautam, I; Haba, MK; Hibiya, Y; Hidaka, H; Hoppe, P; Huss, GR; Iizuka, T; Ireland, TR; Ishikawa, A; Itoh, S; Kawasaki, N; Kita, NT; Kitajima, K; Kleine, T; Krot, S; Liu, MC; Masuda, Y; Moynier, F; Nguyen, A; Nittler, L; Pack, A; Park, C; Piani, L; Qin, LP; Di Rocco, T; Russell, SS; Sakamoto, N; Schönbächler, M; Tafla, L; Tang, HL; Terada, K; Usui, T; Wada, S; Wadhwa, M; Walker, RJ; Yamashita, K; Yin, QZ; Yoneda, S; Young, ED; Zhang, AC; Nakamura, T; Naraoka, H; Noguchi, T; Okazaki, R; Sakamoto, K; Yabuta, H; Abe, M; Miyazaki, A; Nakato, A; Nishimura, M; Okada, T; Yada, T; Yogata, K; Nakazawa, S; Saiki, T; Tanaka, S; Terui, F; Tsuda, Y; Watanabe, S; Yoshikawa, M; Tachibana, S; Yurimoto, H

GEOCHIMICA ET COSMOCHIMICA ACTA 379 172 - 183 2024.8 （ ISSN:0016-7037 eISSN:1872-9533 ）

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Publisher：Geochimica et Cosmochimica Acta

The surface chemistry of pyrrhotites from intact particles directly collected from asteroid (162173) Ryugu was investigated by micro-Raman spectroscopy. The Raman peak characteristic to pyrrhotite was observed at around 115 cm−1 in Ryugu pyrrhotites, similar to freshly cleaved surfaces of terrestrial pyrrhotites. Additional Raman bands centered at around 220, 275, and 313 cm−1 with broadened features were also detected from the Ryugu pyrrhotites. The set of Raman bands at 220 and 275 cm−1 was assigned to typical Fe-S stretching vibrations of ν2 (225 cm−1) and ν1 (275 cm−1). These bands are not clearly observed in bulk crystals of pyrrhotite but appear in its nanoparticulate phase. These bands are ordinarily seen in amorphous monosulfides that formed under low oxygen fugacity (fO2) conditions in nature, indicating that the structural alteration of pyrrhotite surfaces occurred heterogeneously on the nanoscale under low fO2 conditions. Further, the Raman band at 313 cm−1 was attributed to a characteristic tetrahedral bonding of Fe(III) in the lattice of FeII1-3xFeIII1-2xS, followed by the local breakdown of the crystal lattice structures from planar bonding with Fe(II). In addition, some areas of the Ryugu pyrrhotite grains showed corroded structures with iridescence. Furthermore, assemblages of magnetite particles were also preferentially observed on small areas of the likely-dissolved pyrrhotite crystals in phyllosilicate matrices. These characteristic features in the Raman spectra and in corroded structures of Ryugu pyrrhotites record changes in the local environmental conditions via aqueous alteration. The corrosion of pyrrhotite crystals followed by the preferential formation of magnetite particles by asteroidal water is the likely product of dissolution of Fe(II) from the pyrrhotite surface and its oxidative precipitation in microchemical environments on the Ryugu parent body.

DOI： 10.1016/j.gca.2024.06.016

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Electron microscopy observations of the diversity of Ryugu organic matter and its relationship to minerals at the micro- to nano-scale

Stroud R.M., Barosch J., Bonal L., Burgess K., Cody G.D., De Gregorio B.T., Daly L., Dartois E., Dobrică E., Duprat J., Engrand C., Harries D., Hashiguchi M., Ishii H., Kebukawa Y., Kilcoyne A.D., Langenhorst F., Lee M.R., Nittler L.R., Quirico E., Okumura T., Remusat L., Sandford S., Yabuta H., Abe M., Abreu N.M., Bagot P.A.J., Beck P., Bejach L., Bland P.A., Bridges J.C., Cymes B.A., Dazzi A., de la Peña F., Deniset-Besseau A., Enju S., Enokido Y., Frank D.R., Gray J., Haruta M., Hata S., Hicks L., Igami Y., Jacob D., Kamide K., Komatsu M., Laforet S., Leroux H., Le Guillou C., Martins Z., Marinova M., Martinez J., Mathurin J., Matsumoto M., Matsumoto T., Matsuno J., McFadzean S., Michikami T., Mitsukawa I., Miyake A., Miyahara M., Miyazaki A., Montagnac G., Mostefaoui S., Nakamura T., Nakato A., Naraoka H., Nakauchi Y., Nakazawa S., Nishimura M., Noguchi T., Ohtaki K., Ohigashi T., Okada T., Okumura S., Okazaki R., Phan T.H.V., Rebois R., Sakamoto K., Saiki T., Saito H., Seto Y., Shigenaka M., Smith W., Suga H., Sun M., Tachibana S., Takahashi Y., Takeichi Y., Takeuchi A., Takigawa A., Tamenori Y., Tanaka S., Terui F., Thompson M.S., Tomioka N., Tsuchiyama A., Tsuda Y., Uesugi K., Uesugi M.

Meteoritics and Planetary Science 59 ( 8 ) 2023 - 2043 2024.8 （ ISSN:10869379 ）

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Transmission electron microscopy analyses of Hayabusa2 samples show that Ryugu organic matter exhibits a range of morphologies, elemental compositions, and carbon functional chemistries consistent with those of carbonaceous chondrites that have experienced low-temperature aqueous alteration. Both nanoglobules and diffuse organic matter are abundant. Non-globular organic particles are also present, and including some that contain nanodiamond clusters. Diffuse organic matter is finely distributed in and around phyllosilicates, forms coatings on other minerals, and is also preserved in vesicles in secondary minerals such as carbonate and pyrrhotite. The average elemental compositions determined by energy-dispersive spectroscopy of extracted, demineralized insoluble organic matter samples A0107 and C0106 are C100N3O9S1 and C100N3O7S1, respectively, with the difference in O/C slightly outside the difference in the standard error of the mean. The functional chemistry of the nanoglobules varies from mostly aromatic C=C to mixtures of aromatic C=C, ketone C=O, aliphatic (CHn), and carboxyl (COOH) groups. Diffuse organic matter associated with phyllosilicates has variable aromatic C, ketone and carboxyl groups, and some localized aliphatics, but is dominated by molecular carbonate (CO3) absorption, comparable to prior observations of clay-bound organic matter in CI meteorites.

DOI： 10.1111/maps.14128

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Primordial aqueous alteration recorded in water-soluble organic molecules from the carbonaceous asteroid (162173) Ryugu

Takano Y., Naraoka H., Dworkin J.P., Koga T., Sasaki K., Sato H., Oba Y., Ogawa N.O., Yoshimura T., Hamase K., Ohkouchi N., Parker E.T., Aponte J.C., Glavin D.P., Furukawa Y., Aoki J., Kano K., Nomura S.I.M., Orthous-Daunay F.R., Schmitt-Kopplin P., Yurimoto H., Nakamura T., Noguchi T., Okazaki R., Yabuta H., Sakamoto K., Yada T., Nishimura M., Nakato A., Miyazaki A., Yogata K., Abe M., Okada T., Usui T., Yoshikawa M., Saiki T., Tanaka S., Terui F., Nakazawa S., Watanabe S.I., Tsuda Y., Tachibana S.

Nature communications 15 ( 1 ) 5708 2024.7

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Language：English Publisher：Nature communications

We report primordial aqueous alteration signatures in water-soluble organic molecules from the carbonaceous asteroid (162173) Ryugu by the Hayabusa2 spacecraft of JAXA. Newly identified low-molecular-weight hydroxy acids (HO-R-COOH) and dicarboxylic acids (HOOC-R-COOH), such as glycolic acid, lactic acid, glyceric acid, oxalic acid, and succinic acid, are predominant in samples from the two touchdown locations at Ryugu. The quantitative and qualitative profiles for the hydrophilic molecules between the two sampling locations shows similar trends within the order of ppb (parts per billion) to ppm (parts per million). A wide variety of structural isomers, including α- and β-hydroxy acids, are observed among the hydrophilic molecules. We also identify pyruvic acid and dihydroxy and tricarboxylic acids, which are biochemically important intermediates relevant to molecular evolution, such as the primordial TCA (tricarboxylic acid) cycle. Here, we find evidence that the asteroid Ryugu samples underwent substantial aqueous alteration, as revealed by the presence of malonic acid during keto-enol tautomerism in the dicarboxylic acid profile. The comprehensive data suggest the presence of a series for water-soluble organic molecules in the regolith of Ryugu and evidence of signatures in coevolutionary aqueous alteration between water and organics in this carbonaceous asteroid.

DOI： 10.1038/s41467-024-49237-6

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PubMed
Raman spectroscopy of Ryugu particles and their extracted residues: Fluorescence background characteristics and similarities to CI chondrites

Komatsu, M; Yabuta, H; Kebukawa, Y; Bonal, L; Quirico, E; Fagan, TJ; Cody, GD; Barosch, J; Bejach, L; Dartois, E; Dazzi, A; De Gregorio, B; Deniset-Besseau, A; Duprat, J; Engrand, C; Hashiguchi, M; Martins, Z; Mathurin, J; Montagnac, G; Mostefaoui, S; Nittler, LR; Ohigashi, T; Okumura, T; Rémusat, L; Sandford, S; Stroud, R; Suga, H; Takahashi, Y; Takeichi, Y; Tamenori, Y; Verdier-Paoletti, M; Yamashita, S; Yurimoto, H; Nakamura, T; Noguchi, T; Okazaki, R; Naraoka, H; Sakamoto, K; Yoshikawa, M; Saiki, T; Tanaka, S; Terui, F; Nakazawa, S; Usui, T; Abe, M; Okada, T; Yada, T; Nishimura, M; Nakato, A; Miyazaki, A; Yogata, K; Tachibana, S; Watanabe, S; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 59 ( 8 ) 2166 - 2185 2024.7 （ ISSN:1086-9379 eISSN:1945-5100 ）

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We present here an investigation of Ryugu particles recovered by the Hayabusa2 space mission and their extracted carbonaceous acid residues using Raman spectroscopy. Raman parameters of Ryugu intact grains and their acid residues are characterized by broad D (defect induced) and G (graphite) band widths, indicating the presence of polyaromatic carbonaceous matter with low thermal maturity. Raman spectra of Ryugu particles and CI (type 1) chondrites exhibit stronger laser-induced fluorescence backgrounds compared to Type 2 and Type 3 carbonaceous chondrites. The high fluorescence signatures and wide bandwidths of the D and G bands of Ryugu intact grains are similar to the Raman spectra observed in CI chondrites, reflecting the low structural order of their aromatic carbonaceous matter, and strengthening the link between Ryugu particles and CI chondrites. The high fluorescence background intensity of the Ryugu particles is due to multiple causes, but it is likely that the relative abundance of geometry-bearing macromolecular organic matter in total organic carbon contents makes a large contribution to the fluorescence intensities. Locally observed high fluorescence in the acid-extracted residues of Ryugu is due to nitrogen-bearing outlier phase. The high fluorescence signature is one consequence of the low degree of thermal maturity of the organic matter and supports evidence that the Ryugu particles have escaped significant parent body thermal metamorphism.

DOI： 10.1111/maps.14234

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Microscale hydrogen, carbon, and nitrogen isotopic diversity of organic matter in asteroid Ryugu

Nittler, LR; Barosch, J; Burgess, K; Stroud, RM; Wang, JH; Yabuta, H; Enokido, Y; Matsumoto, M; Nakamura, T; Kebukawa, Y; Yamashita, S; Takahashi, Y; Bejach, L; Bonal, L; Cody, G; Dartois, E; Dazzi, A; De Gregorio, B; Deniset-Besseau, A; Duprat, J; Engrand, C; Hashiguchi, M; Kilcoyne, ALD; Komatsu, M; Martins, Z; Mathurin, J; Montagnac, G; Mostefaoui, S; Okumura, T; Quirico, E; Remusat, L; Sandford, S; Shigenaka, M; Suga, H; Takeichi, Y; Tamenori, Y; Verdier-Paoletti, M; Wakabayashi, D; Abe, M; Kamide, K; Miyazaki, A; Nakato, A; Nakazawa, S; Nishimura, M; Okada, T; Saiki, T; Tanaka, S; Terui, F; Usui, T; Yada, T; Yogata, K; Yoshikawa, M; Yurimoto, H; Noguchi, T; Okazaki, R; Naraoka, H; Sakamoto, K; Tachibana, S; Watanabe, S; Tsuda, Y

EARTH AND PLANETARY SCIENCE LETTERS 637 2024.7 （ ISSN:0012-821X eISSN:1385-013X ）

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Publisher：Earth and Planetary Science Letters

We report the H, C, and N isotopic compositions of microscale (0.2 to 2 µm) organic matter in samples of asteroid Ryugu and the Orgueil CI carbonaceous chondrite. Three regolith particles of asteroid Ryugu, returned by the Hayabusa2 spacecraft, and several fragments of Orgueil were analyzed by NanoSIMS isotopic imaging. The isotopic distributions of the Ryugu samples from two different collection spots are closely similar to each other and to the Orgueil samples, strengthening the proposed Ryugu-CI chondrite connection. Most individual sub-μm organic grains have isotopic compositions within error of bulk values, but 2–10 % of them are outliers exhibiting large isotopic enrichments or depletions in D, 15N, and/or 13C. The H, C and N isotopic compositions of the outliers are not correlated with each other: while some organic grains are both D- and 15N-enriched, many are enriched or depleted in one or the other system. This most likely points to a diversity in isotopic fractionation pathways and thus diversity in the local formation environments for the individual outlier grains. The observation of a relatively small population of isotopic outlier grains can be explained either by escape from nebular and/or parent body homogenization of carbonaceous precursor material or addition of later isotopic outlier grains. The strong chemical similarity of isotopically typical and isotopically outlying grains, as reflected by synchrotron x-ray absorption spectra, suggests a genetic connection and thus favors the former, homogenization scenario. However, the fact that even the least altered meteorites show the same pattern of a small population of outliers on top of a larger population of homogenized grains indicates that some or most of the homogenization occurred prior to accretion of the macromolecular organic grains into asteroidal parent bodies.

DOI： 10.1016/j.epsl.2024.118719

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Three-dimensional textures of Ryugu samples and their implications for the evolution of aqueous alteration in the Ryugu parent body

Tsuchiyama, A; Matsumoto, M; Matsuno, J; Yasutake, M; Nakamura, T; Noguchi, T; Miyake, A; Uesugi, K; Takeuchi, A; Okumura, S; Fujioka, Y; Sun, MQ; Takigawa, A; Matsumoto, T; Enju, S; Mitsukawa, I; Enokido, Y; Kawamoto, T; Mikouchi, T; Michikami, T; Morita, T; Kikuiri, M; Amano, K; Kagawa, E; Rubino, S; Dionnet, Z; Aleon-Toppani, A; Brunetto, R; Zolensky, ME; Nakano, T; Nakano, N; Yurimoto, H; Okazaki, R; Yabuta, H; Naraoka, H; Sakamoto, K; Yada, T; Nishimura, M; Nakato, A; Miyazaki, A; Yogata, K; Abe, M; Okada, T; Usui, T; Yoshikawa, M; Saiki, T; Tanaka, S; Nakazawa, S; Terui, F; Tachibana, S; Watanabe, S; Tsuda, Y

GEOCHIMICA ET COSMOCHIMICA ACTA 375 146 - 172 2024.6 （ ISSN:0016-7037 eISSN:1872-9533 ）

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Publisher：Geochimica et Cosmochimica Acta

Samples collected from the surface/subsurface of C-type asteroid 162173 Ryugu by the Hayabusa2 mission were nondestructively analyzed in three dimensions (3D). Seventy-three small particles (approximately 10–180 µm in size) were observed using X-ray nanotomography, with an effective spatial resolution of approximately 200 nm. Detailed descriptions of these samples in terms of mineralogy, petrology, and variations among particles were reported. The 57 most common particles consisted of a phyllosilicate matrix containing mineral grains, mainly magnetite, pyrrhotite, dolomite and apatite. The remaining particles were mostly monomineralic particles (pyrrhotite, dolomite, breunnerite, apatite, and Mg-Na phosphate) with two unique particles (calcite in a Al2Si2O5(OH)4 matrix, and CaCO3, phyllosilicate, and tochilinite-chronstedtite inclusions in a carbonaceous material matrix). The results confirmed that the samples correspond to Ivuna-type carbonaceous chondrites (CI chondrites) or related materials. Many small inclusions of voids and carbonaceous materials were detected in pyrrhotite, dolomite, breunnerite, and apatite. However, no fluid inclusions were observed, except for those in pyrrhotite that have already been reported. Magnetite exhibited a wide variety of morphologies, from irregular shapes (spherulites, framboids, plaquettes, and whiskers) to euhedral shapes (equants, rods, and cubes), along with transitional shapes. In contrast, the other minerals exhibit predominantly euhedral shapes (pyrrhotite: pseudo-hexagonal plates, dolomite: flattened rhombohedrons, breunnerite: largely flattened rhombohedrons, and apatite: hexagonal prisms) or aggregates of faceted crystals, except for Mg-Na phosphate. The matrices were heterogeneous with variable phyllosilicate particle sizes, Mg/Fe ratios, density (1.7 ± 0.2 g/cm3), nanoporosities (36 ± 9 %), and abundances of nanograins of Fe(-Ni) sulfides. The macroporosity of the particles was estimated as 12 ± 4 %. The observed textural relationships among the minerals suggest a precipitation sequence of: magnetite (spherulite → plaquette/framboid → rod/equant) → pyrrhotite (pentlandite → pyrrhotite) → apatite → dolomite → breunnerite → coarse phyllosilicates. Fe-bearing olivine (or low-Ca pyroxene) might have precipitated later than dolomite, indicating a high Mg activity in the aqueous solution. This precipitation sequence corresponds to a transition from irregular crystal forms (as seen in some magnetite) to regular forms of euhedral crystals (observed in some magnetite and other minerals). Based on the precipitation sequence and mineral morphologies, together with previously reported observations, a model for aqueous alteration in the Ryugu parent body was proposed as follows: CO2-H2O ice, amorphous silicates (GEMS-like material), and some minerals (mostly metal, sulfides, and anhydrous silicates) accumulated to form the parent body of Ryugu. Amorphous silicates and Fe-Ni metal quickly dissolved into the melted ice to form a highly supersaturated aqueous solution. Poorly-crystalized phyllosilicate and spherulitic magnetite precipitated first, followed by plaquette/framboidal magnetites with decreasing degree of supersaturation due to precipitation. Pseudo-hexagonal pyrrhotite plates were formed by dissolution and reprecipitation under relatively low supersaturation. Subsequently, apatite, dolomite, and breunnerite precipitated in this order in response to decreasing supersaturation.

DOI： 10.1016/j.gca.2024.03.032

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Incipient space weathering on asteroid 162173 Ryugu recorded by pyrrhotite

Harries, D; Matsumoto, T; Langenhorst, F; Noguchi, T; Miyake, A; Igami, Y; Haruta, M; Seto, Y; Miyahara, M; Tomioka, N; Saito, H; Hata, S; Takigawa, A; Nakauchi, Y; Tachibana, S; Nakamura, T; Matsumoto, M; Ishii, HA; Bradley, JP; Ohtaki, K; Dobrica, E; Leroux, H; Le Guillou, C; Jacob, D; de la Pena, F; Laforet, S; Mouloud, BE; Marinova, M; Beck, P; Phan, VH; Rebois, R; Abreu, NM; Gray, J; Zega, T; Zanetta, PM; Thompson, MS; Stroud, R; Burgess, K; Cymes, BA; Bridges, JC; Hicks, L; Lee, MR; Daly, L; Bland, PA; Zolensky, ME; Frank, DR; Martinez, J; Tsuchiyama, A; Yasutake, M; Matsuno, J; Okumura, S; Mitsukawa, I; Uesugi, K; Uesugi, M; Takeuchi, A; Sun, MQ; Enju, S; Michikami, T; Yurimoto, H; Okazaki, R; Yabuta, H; Naraoka, H; Sakamoto, K; Yada, T; Nishimura, M; Nakato, A; Miyazaki, A; Yogata, K; Abe, M; Okada, T; Usui, T; Yoshikawa, M; Saiki, T; Tanaka, S; Terui, F; Nakazawa, S; Watanabe, SI; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 59 ( 8 ) 2134 - 2148 2024.5 （ ISSN:1086-9379 eISSN:1945-5100 ）

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Publisher：Meteoritics and Planetary Science

Regolith samples returned from asteroid 162173 Ryugu by the Hayabusa2 mission provide direct means to study how space weathering operates on the surfaces of hydrous asteroids. The mechanisms of space weathering, its effects on mineral surfaces, and the characteristic time scales on which alteration occurs are central to understanding the spectroscopic properties and the taxonomy of asteroids in the solar system. Here, we investigate the behavior of the iron monosulfides mineral pyrrhotite (Fe1−xS) at the earliest stages of space weathering. Using electron microscopy methods, we identified a partially exposed pyrrhotite crystal that morphologically shows evidence for mass loss due to exposure to solar wind ion irradiation. We find that crystallographic changes to the pyrrhotite can be related to sulfur loss from its space-exposed surface and the diffusive redistribution of resulting excess iron into the interior of the crystal. Diffusion profiles allow us to estimate an order of magnitude of the exposure time of a few thousand years consistent with previous estimates of space exposure. During this interval, the adjacent phyllosilicates did not acquire discernable damage, suggesting that they are less susceptible to alteration by ion irradiation than pyrrhotite.

DOI： 10.1111/maps.14176

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A comprehensive study of apatite grains in Ryugu rock fragments

Tkalcec, BJ; Tack, P; De Pauw, E; Bazi, B; Vekemans, B; Lindner, M; Vincze, L; Di Michiel, M; Garrevoet, J; Falkenberg, G; Nakamura, T; Morita, T; Amano, K; Nakashima, D; Langenhorst, F; Pollok, K; Yurimoto, H; Noguchi, T; Okazaki, R; Yabuta, H; Naraoka, H; Sakamoto, K; Tachibana, S; Yada, T; Nishimura, M; Nakato, A; Miyazaki, A; Yogata, K; Abe, M; Okada, T; Usui, T; Yoshikawa, M; Saiki, T; Tanaka, S; Terui, F; Nakazawa, S; Watanabe, S; Tsuda, Y; Brenker, FE

METEORITICS & PLANETARY SCIENCE 59 ( 8 ) 2149 - 2165 2024.5 （ ISSN:1086-9379 eISSN:1945-5100 ）

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Publisher：Meteoritics and Planetary Science

Apatite is present as an accessory phase in many meteorites and is often formed as a secondary product of aqueous alteration. Its propensity to incorporate rare earth elements (REE) results in apatite usually being the main REE-bearing phase in hydrously altered meteorites. Asteroid Ryugu is thought to have experienced pervasive aqueous alteration and material collected from the surface of Ryugu is expected to provide insight into asteroidal aqueous alteration processes without influence by terrestrial weathering. Morphologies and mineral associations of apatite grains from five rock fragments collected from the asteroid Ryugu by the Hayabusa2 spacecraft were examined and their REE concentrations were measured by synchrotron X-ray fluorescence (SXRF) spectroscopy. The main minerals associated with apatite are dolomite, magnetite, and pyrrhotite. Grain boundary corrosion of the interfaces between apatite assemblages and the surrounding matrix suggest that paragenetic formation on the asteroid was followed by a later episode of hydrous alteration. Light REE (LREE) concentration levels recorded at 20–150 times those of bulk CI levels together with a steady increase from LREE toward enrichment of medium REE (MREE, up to Er) at 50–400 times bulk CI levels may suggest postgenetic removal of LREE from Ryugu apatite grains by late-stage circulation of a hydrothermal fluid.

DOI： 10.1111/maps.14177

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Enantioselective three-dimensional high-performance liquid chromatographic determination of amino acids in the Hayabusa2 returned samples from the asteroid Ryugu

Furusho A., Ishii C., Akita T., Oyaide M., Mita M., Naraoka H., Takano Y., Dworkin J.P., Oba Y., Koga T., Fukushima K., Aoki D., Hashiguchi M., Mita H., Chikaraishi Y., Ohkouchi N., Ogawa N.O., Sakai S., Glavin D.P., Elsila J.E., Parker E.T., Aponte J.C., McLain H.L., Orthous-Daunay F.R., Vuitton V., Thissen R., Wolters C., Schmitt-Kopplin P., Ruf A., Isa J., Hertkorn N., Eiler J.M., Yoshimura T., Sugahara H., Graham H.V., Furukawa Y., Araoka D., Tanaka S., Yoshikawa T., Kabashima F., Sasaki K., Sato H., Yamazaki T., Onose M., Morita M., Kimura Y., Kano K., Aoki J., Fujishima K., Nomura S.i., Tachibana S., Nakamura T., Noguchi T., Okazaki R., Yabuta H., Yurimoto H., Sakamoto K., Yada T., Nishimura M., Nakato A., Miyazaki A., Yogata K., Abe M., Usui T., Yoshikawa M., Saiki T., Tanaka S., Terui F., Nakazawa S., Okada T., Watanabe S.i., Tsuda Y., Hamase K.

Journal of Chromatography Open 5 2024.5

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Publisher：Journal of Chromatography Open

The chirality of amino acids in extraterrestrial materials may provide an insight into the origin of the essential L-enantiopure amino acids in the terrestrial biosphere. In 2020, the Hayabusa2 mission succeeded in bringing back surface materials from the C-type asteroid (162173) Ryugu to the Earth. Amino acids were one of the targeted organic molecules to be studied in the Ryugu samples. To analyze the various structural isomers of amino acids, which were expected to be present, from the limited amount of the returned samples, the development of a highly-sensitive and selective analytical method was necessary. In the present study, a three-dimensional high-performance liquid chromatography (3D-HPLC) system has been developed for the enantioselective determination of five proteinogenic and three non-proteinogenic amino acids in the Ryugu samples, in which amino acids in the sample were separated by reversed-phase, anion-exchange and enantioselective columns after the fluorescence derivatization with 4-fluoro-7-nitro-2,1,3-benzoxadiozole. The applicability of the analytical system to the extraterrestrial samples was evaluated by analyzing several types of carbonaceous meteorites before applying the system to the Ryugu samples. In the analysis of the Ryugu samples, all of the target amino acids were successfully determined quantitatively. Non-proteinogenic amino acids including 2-amino-n-butyric acid, isovaline and norvaline, rarely present in the terrestrial environment, were found as almost racemic mixtures with 47.1 to 55.2%L.

DOI： 10.1016/j.jcoa.2024.100134

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The Earth atmosphere-like bulk nitrogen isotope composition obtained by stepwise combustion analyses of Ryugu return samples

Hashizume, K; Ishida, A; Chiba, A; Okazaki, R; Yogata, K; Yada, T; Kitajima, F; Yurimoto, H; Nakamura, T; Noguchi, T; Yabuta, H; Naraoka, H; Takano, Y; Sakamoto, K; Tachibana, S; Nishimura, M; Nakato, A; Miyazaki, A; Abe, M; Okada, T; Usui, T; Yoshikawa, M; Saiki, T; Terui, F; Tanaka, S; Nakazawa, S; Watanabe, SI; Tsuda, Y; Broadley, MW; Busemann, H

METEORITICS & PLANETARY SCIENCE 59 ( 8 ) 2117 - 2133 2024.4 （ ISSN:1086-9379 eISSN:1945-5100 ）

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Publisher：Meteoritics and Planetary Science

The nitrogen isotope compositions of two samples returned from the asteroid Ryugu were determined using a stepwise combustion method, along with Ivuna (CI) and Y-980115, a CI-like Antarctic meteorite, as references. The two Ryugu samples A0105-07 and C0106-07 showed bulk δ15N values of +1.7 ± 0.5‰ and +0.2 ± 0.6‰, respectively, significantly lower than Ivuna with +36.4 ± 0.4‰, but close to Y-980115 with +4.0 ± 0.3‰. The Ryugu samples are further characterized by C/N and 36Ar/N ratios up to 3.4× and 4.9× the value of Ivuna, respectively. Among all Ryugu samples and CI chondrites, a positive correlation was observed between nitrogen concentrations and δ15N values, with samples with lower nitrogen concentrations exhibiting lower δ15N. This trend is explained by a two-component mixing model. One component is present at a constant abundance among all CI-related samples, with a δ15N value around 0‰ or lower. The other varies in abundance between different samples, and exhibits a δ15N value of +56 ± 4‰. The first 15N-poor endmember is seemingly tightly incorporated into a carbonaceous host phase, whereas the 15N-rich endmember can be mobilized and decoupled from carbon, potentially because it is in the form of ammonia. Asteroid materials with volatile compositions that are similar to those reported here for the Ryugu samples are attractive candidates for the volatile sources among Earth's building blocks.

DOI： 10.1111/maps.14175

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Nonmagnetic framboid and associated iron nanoparticles with a space-weathered feature from asteroid Ryugu

Kimura, Y; Kato, T; Anada, S; Yoshida, R; Yamamoto, K; Tanigaki, T; Akashi, T; Kasai, H; Kurosawa, K; Nakamura, T; Noguchi, T; Sato, M; Matsumoto, T; Morita, T; Kikuiri, M; Amano, K; Kagawa, E; Yada, T; Nishimura, M; Nakato, A; Miyazaki, A; Yogata, K; Abe, M; Okada, T; Usui, T; Yoshikawa, M; Saiki, T; Tanaka, S; Terui, F; Nakazawa, S; Yurimoto, H; Okazaki, R; Yabuta, H; Naraoka, H; Sakamoto, K; Watanabe, SI; Tsuda, Y; Tachibana, S

NATURE COMMUNICATIONS 15 ( 1 ) 3493 2024.4 （ eISSN:2041-1723 ）

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Language：English Publisher：Nature Communications

Extraterrestrial minerals on the surface of airless Solar System bodies undergo gradual alteration processes known as space weathering over long periods of time. The signatures of space weathering help us understand the phenomena occurring in the Solar System. However, meteorites rarely retain the signatures, making it impossible to study the space weathering processes precisely. Here, we examine samples retrieved from the asteroid Ryugu by the Hayabusa2 spacecraft and discover the presence of nonmagnetic framboids through electron holography measurements that can visualize magnetic flux. Magnetite particles, which normally provide a record of the nebular magnetic field, have lost their magnetic properties by reduction via a high-velocity (>5 km s–1) impact of a micrometeoroid with a diameter ranging from 2 to 20 μm after destruction of the parent body of Ryugu. Around these particles, thousands of metallic-iron nanoparticles with a vortex magnetic domain structure, which could have recorded a magnetic field in the impact event, are found. Through measuring the remanent magnetization of the iron nanoparticles, future studies are expected to elucidate the nature of the nebular/interplanetary magnetic fields after the termination of aqueous alteration in an asteroid.

DOI： 10.1038/s41467-024-47798-0

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PubMed
Nonmagnetic framboid and associated iron nanoparticles with a space-weathered feature from asteroid Ryugu

Kimura Yuki, Kato Takeharu, Anada Satoshi, Yoshida Ryuji, Yamamoto Kazuo, Tanigaki Toshiaki, Akashi Tetsuya, Kasai Hiroto, Kurosawa Kosuke, Nakamura Tomoki, Noguchi Takaaki, Sato Masahiko, Matsumoto Toru, Morita Tomoyo, Kikuiri Mizuha, Amano Kana, Kagawa Eiichi, Yada Toru, Nishimura Masahiro, Nakato Aiko, Miyazaki Akiko, Yogata Kasumi, Abe Masanao, Okada Tatsuaki, Usui Tomohiro, Yoshikawa Makoto, Saiki Takanao, Tanaka Satoshi, Terui Fuyuto, Nakazawa Satoru, Yurimoto Hisayoshi, Okazaki Ryuji, Yabuta Hikaru, Naraoka Hiroshi, Sakamoto Kanako, Watanabe Sei-ichiro, Tsuda Yuichi, Tachibana Shogo

Nature Communications 15 2024.4 （ eISSN:20411723 ）

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Language：English

Extraterrestrial minerals on the surface of airless Solar System bodies undergo gradual alteration processes known as space weathering over long periods of time. The signatures of space weathering help us understand the phenomena occurring in the Solar System. However, meteorites rarely retain the signatures, making it impossible to study the space weathering processes precisely. Here, we examine samples retrieved from the asteroid Ryugu by the Hayabusa2 spacecraft and discover the presence of nonmagnetic framboids through electron holography measurements that can visualize magnetic flux. Magnetite particles, which normally provide a record of the nebular magnetic field, have lost their magnetic properties by reduction via a high-velocity (>5 km s⁻¹) impact of a micrometeoroid with a diameter ranging from 2 to 20 μm after destruction of the parent body of Ryugu. Around these particles, thousands of metallic-iron nanoparticles with a vortex magnetic domain structure, which could have recorded a magnetic field in the impact event, are found. Through measuring the remanent magnetization of the iron nanoparticles, future studies are expected to elucidate the nature of the nebular/interplanetary magnetic fields after the termination of aqueous alteration in an asteroid.

CiNii Research
AFM-IR nanospectroscopy of nanoglobule-like particles in Ryugu samples returned by the Hayabusa2 mission

Mathurin, J; Bejach, L; Dartois, E; Engrand, C; Dazzi, A; Deniset-Besseau, A; Duprat, J; Kebukawa, Y; Yabuta, H; Bonal, L; Quirico, E; Sandt, C; Borondics, F; Barosch, J; Beck, P; Cody, GD; De Gregorio, BT; Hashiguchi, M; Kilcoyne, DAL; Komatsu, M; Martins, Z; Matsumoto, M; Montagnac, G; Mostefaoui, S; Nittler, LR; Ohigashi, T; Okumura, T; Phan, VH; Remusat, L; Sandford, S; Shigenaka, M; Stroud, R; Suga, H; Takahashi, Y; Takeichi, Y; Tamenori, Y; Verdier-Paoletti, M; Yamashita, S; Nakamura, T; Morita, T; Kikuiri, M; Amano, K; Kagawa, E; Noguchi, T; Naraoka, H; Okazaki, R; Sakamoto, K; Yurimoto, H; Abe, M; Kamide, K; Miyazaki, A; Nakato, A; Nakazawa, S; Nishimura, M; Okada, T; Saiki, T; Tachibana, S; Tanaka, S; Terui, F; Tsuda, Y; Usui, T; Watanabe, SI; Yada, T; Yogata, K; Yoshikawa, M

ASTRONOMY & ASTROPHYSICS 684 2024.4 （ ISSN:0004-6361 eISSN:1432-0746 ）

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Publisher：Astronomy and Astrophysics

Context. The JAXA Hayabusa2 mission returned well-preserved samples collected from the carbonaceous asteroid Ryugu, providing unique non-terrestrially weathered samples from a known parent body. Aims. This work aims to provide a better understanding of the formation and evolution of primitive asteroidal matter by studying the fine scale association of organic matter and minerals in Ryugu samples. We characterized the samples by IR nanospectroscopy using infrared photothermal nanospectroscopy (AFM-IR) technique. This technique overcomes the diffraction limit (of several microns) of conventional infrared microspectroscopy (μ-FTIR). The samples were mapped in the mid-IR range at a lateral spatial resolution about a hundred times better than with μ-FTIR. This provided us with unique in situ access to the distribution of the different infrared signatures of organic components at the sub-micron scale present in the Ryugu whole-rock samples as well as to the characterization of the compositional variability of Ryugu in the insoluble organic matter (IOM) chemically extracted from the Ryugu samples. Methods. The AFM-IR maps of whole-rock particles and IOM residues from Ryugu samples were recorded with a lateral resolution of tens of nanometers. Spectra were recorded in the 1900-900 cm-1 spectral range by AFM-IR (Icon-IR) for all samples, and additional spectra were recorded from 2700 to 4000 cm-1 for one IOM sample by an optical photothermal IR (O-PTIR) technique using a mIRage® IR microscope. Results. Organic matter is present in two forms in the whole-rock samples: as a diffuse phase intermixed with the phyllosilicate matrix and as individual organic nanoparticles. We identify the Ryugu organic nanoparticles as nanoglobule-like inclusions texturally resembling nanoglobules present in primitive meteorites. Using AFM-IR, we record for the first time the infrared spectra of Ryugu organic nanoparticles that clearly show enhanced carbonyl (C=O) and CH contributions with respect to the diffuse organic matter in Ryugu whole-rock and IOM residue.

DOI： 10.1051/0004-6361/202347435

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Correlated IR-SEM-TEM studies of three different grains from Ryugu: From the initial material to post-accretional processes

Aléon-Toppani, A; Brunetto, R; Dionnet, Z; Rubino, S; Baklouti, D; Brisset, F; Vallet, M; Heripre, E; Nakamura, T; Lantz, C; Djouadi, Z; Borondics, F; Sandt, C; Troadec, D; Mivumbi, O; Matsumoto, M; Amano, K; Morita, T; Yurimoto, H; Noguchi, T; Okazaki, R; Yabuta, H; Naraoka, H; Sakamoto, K; Tachibana, S; Yada, T; Nishimura, M; Nakato, A; Miyazaki, A; Yogata, K; Abe, M; Okada, T; Usui, T; Yoshikawa, M; Saiki, T; Tanaka, S; Terui, F; Nakazawa, S; Watanabe, S; Tsuda, Y

GEOCHIMICA ET COSMOCHIMICA ACTA 371 1 - 30 2024.4 （ ISSN:0016-7037 eISSN:1872-9533 ）

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Publisher：Geochimica et Cosmochimica Acta

In order to better constrain the alteration history of the Ryugu parent body, we performed a multi-analytical study combining scanning electron microscopy, transmission electron microscopy and infrared spectroscopy on sections extracted from the three fragments A0064-FO019, A0064-FO021 and C0002-FO019 returned from Ryugu by the Hayabusa2 space mission. The three sections show large differences in terms of structure, mineralogy and infrared signature. Section A0064-FO019 resembles the major Ryugu lithology with the presence of both fine-grained phyllosilicates (fg-phyllos) with embedded nanosulfides and coarse-grained phyllosilicates (cg-phyllos), whereas section C0002-FO019 belongs to the group of the less altered lithologies with the presence of anhydrous minerals embedded in a partially amorphous matrix. Section A0064-FO021 also belongs to this group but shows two different lithologies, a compact amorphous one and a more porous and very fractured one showing the presence of Na-rich phosphate, calcite and olivine. The two less altered lithologies (sections A0064-FO021 and C0002-FO019) show the presence of numerous mineralogical features similar to those observed in cometary interplanetary dust particles, ultra-carbonaceous Antarctic micrometeorites or in the CM Paris meteorite, i.e. amorphous and partially crystallized matrix with GEMS-like ghosts objects, whisker olivine, phosphide, or FeNi metal. This supports an outer solar system origin common with that of cometary material for the Ryugu parent body. Combined with the results of Nakamura et al. (2022b) reporting the presence of a lithology showing the presence of GEMS-like objects, we propose that section C0002-FO019 represents the onset of aqueous alteration of such primitive materials. The cg-phyllos and fg-phyllos of section A0064-FO019, i.e. of the major Ryugu lithology, representing the advanced stage of alteration, exhibit distinctive IR signatures with a higher abundance of oxygen-rich functional groups in the organic matter (OM) from the cg-phyllos. We thus suggest the following chronology of formation and evolution for Ryugu: (1) accretion of highly porous aggregate of GEMS-like units with fine-grained high-temperature anhydrous silicates, (2) onset of alteration with the dissolution of primary nanosulfides and development of amorphous/partially crystallized material in the pores, (3) crystallization of fg-phyllos with a second generation of sulfides, (4) later formation of cg-phyllos devoid of nanosulfides and their associated oxygen-rich OM in a more water-rich environment.

DOI： 10.1016/j.gca.2024.02.006

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Coevolution of phyllosilicate, carbon, sulfide, and apatite in Ryugu's parent body

Gainsforth, Z; Dominguez, G; Amano, K; Matsumoto, M; Fujioka, Y; Kagawa, E; Nakamura, T; Tachibana, S; Morita, T; Kikuiri, M; Yurimoto, H; Noguchi, T; Okazaki, R; Yabuta, H; Naraoka, H; Sakamoto, K; Yada, T; Nishimura, M; Nakato, A; Miyazaki, A; Yogata, K; Abe, M; Okada, T; Usui, T; Yoshikawa, M; Saiki, T; Tanaka, S; Terui, F; Nakazawa, S; Watanabe, S; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 59 ( 8 ) 2073 - 2096 2024.4 （ ISSN:1086-9379 eISSN:1945-5100 ）

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Publisher：Meteoritics and Planetary Science

We analyzed an asteroid Ryugu sample returned to Earth by JAXA's Hayabusa2 mission using nanoIR, SEM, and TEM microscopy. We identified multiple distinct carbon reservoirs within the phyllosilicate matrix and demonstrate infrared spectral affinities for some of the carbon to insoluble organic matter (IOM). TEM studies of Ryugu samples have allowed us to better understand the interrelationship between the crystallographic orientations of phyllosilicates and the secondary minerals such as carbonate, sulfide, and apatite. Transport of elements provides a unifying theme for understanding these interrelationships.

DOI： 10.1111/maps.14161

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Disequilibrium oxygen isotope distribution among aqueously altered minerals in Ryugu asteroid returned samples

Kita, NT; Kitajima, K; Nagashima, K; Kawasaki, N; Sakamoto, N; Fujiya, W; Abe, Y; Aleon, J; Alexander, CMO; Amari, S; Amelin, Y; Bajo, KI; Bizzarro, M; Bouvier, A; Carlson, RW; Chaussidon, M; Choi, BG; Dauphas, N; Davis, AM; Di Rocco, T; Fukai, R; Gautam, I; Haba, MK; Hibiya, Y; Hidaka, H; Homma, H; Hoppe, P; Huss, GR; Ichida, K; Iizuka, T; Ireland, TR; Ishikawa, A; Itoh, S; Kleine, T; Komatani, S; Krot, AN; Liu, MC; Masuda, Y; Mckeegan, KD; Morita, M; Motomura, K; Moynier, F; Nakai, I; Nguyen, A; Nittler, L; Onose, M; Pack, A; Park, C; Piani, L; Qin, LP; Russell, SS; Schoenbaechler, M; Tafla, L; Tang, HL; Terada, K; Terada, Y; Usui, T; Wada, S; Wadhwa, M; Walker, RJ; Yamashita, K; Yin, QZ; Yokoyama, T; Yoneda, S; Young, ED; Yui, H; Zhang, AC; Nakamura, T; Naraoka, H; Noguchi, T; Okazaki, R; Sakamoto, K; Yabuta, H; Abe, M; Miyazaki, A; Nakato, A; Nishimura, M; Okada, T; Yada, T; Yogata, K; Nakazawa, S; Saiki, T; Tanaka, S; Terui, F; Tsuda, Y; Watanabe, SI; Yoshikawa, M; Tachibana, S; Yurimoto, H

METEORITICS & PLANETARY SCIENCE 59 ( 8 ) 2097 - 2116 2024.4 （ ISSN:1086-9379 eISSN:1945-5100 ）

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Publisher：Meteoritics and Planetary Science

Oxygen 3-isotope ratios of magnetite and carbonates in aqueously altered carbonaceous chondrites provide important clues to understanding the evolution of the fluid in the asteroidal parent bodies. We conducted oxygen 3-isotope analyses of magnetite, dolomite, and breunnerite in two sections of asteroid Ryugu returned samples, A0058 and C0002, using a secondary ion mass spectrometer (SIMS). Magnetite was analyzed by using a lower primary ion energy that reduced instrumental biases due to the crystal orientation effect. We found two groups of magnetite data identified from the SIMS pit morphologies: (1) higher δ18O (from 3‰ to 7‰) and ∆17O (~2‰) with porous SIMS pits mostly from spherulitic magnetite, and (2) lower δ18O (~ −3‰) and variable ∆17O (0‰–2‰) mostly from euhedral magnetite. Dolomite and breunnerite analyses were conducted using multi-collection Faraday cup detectors with precisions ≤0.3‰. The instrumental bias correction was applied based on carbonate compositions in two ways, using Fe and (Fe + Mn) contents, respectively, because Ryugu dolomite contains higher amounts of Mn than the terrestrial standard. Results of dolomite and breunnerite analyses show a narrow range of ∆17O; 0.0‰–0.3‰ for dolomite in A0058 and 0.2‰–0.8‰ for dolomite and breunnerite in C0002. The majority of breunnerite, including large ≥100 μm grains, show systematically lower δ18O (~21‰) than dolomite (25‰–30‰ and 23‰–27‰ depending on the instrumental bias corrections). The equilibrium temperatures between magnetite and dolomite from the coarse-grained lithology in A0058 are calculated to be 51 ± 11°C and 78 ± 14°C, depending on the instrumental bias correction scheme for dolomite; a reliable temperature estimate would require a Mn-bearing dolomite standard to evaluate the instrumental bias corrections, which is not currently available. These results indicate that the oxygen isotope ratios of aqueous fluids in the Ryugu parent asteroid were isotopically heterogeneous, either spatially, or temporary. Initial water ice accreted to the Ryugu parent body might have ∆17O > 2‰ that was melted and interacted with anhydrous solids with the initial ∆17O < 0‰. In the early stage of aqueous alteration, spherulitic magnetite and calcite formed from aqueous fluid with ∆17O ~ 2‰ that was produced by isotope exchange between water (∆17O > 2‰) and anhydrous solids (∆17O < 0‰). Dolomite and breunnerite, along with some magnetite, formed at the later stage of aqueous alteration under higher water-to-rock ratios where the oxygen isotope ratios were nearly at equilibrium between fluid and solid phases. Including literature data, δ18O of carbonates decreased in the order calcite, dolomite, and breunnerite, suggesting that the temperature of alteration might have increased with the degree of aqueous alteration.

DOI： 10.1111/maps.14163

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Curation protocol of Phobos sample returned by Martian Moons eXploration

Fukai, R; Usui, T; Fujiya, W; Takano, Y; Bajo, K; Beck, A; Bonato, E; Chabot, NL; Furukawa, Y; Genda, H; Hibiya, Y; Jourdan, F; Kleine, T; Koike, M; Matsuoka, M; Miura, YN; Moynier, F; Okazaki, R; Russell, SS; Sumino, H; Zolensky, ME; Sugahara, H; Tachibana, S; Sakamoto, K; Abe, M; Cho, Y; Kuramoto, K

METEORITICS & PLANETARY SCIENCE 59 ( 2 ) 321 - 337 2024.2 （ ISSN:1086-9379 eISSN:1945-5100 ）

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Publisher：Meteoritics and Planetary Science

Japan Aerospace Exploration Agency's Martian Moons eXploration (MMX) mission will launch a spacecraft in 2024 to return samples from Phobos in 2029. Curatorial work for the returned Phobos samples is critical for the sample allocation without degrading the sample integrity and subsequent sample analysis that will provide new constraints on the origin of Phobos and the evolution of the circum-Mars environment. The Sample Analysis Working Team of the MMX is designing the sample curation protocol. The curation protocol consists of three phases: (1) quick analysis (extraction and mass spectrometry for gases), (2) pre-basic characterization (bulk-scale observation), and (3) basic characterization (grain-by-grain observation and allocation of the sample aliquots). Nondestructive analyses within the clean chamber (e.g., visible and near-infrared spectral imaging) and outside the chamber (e.g., gas mass spectrometry) are incorporated into the curation flow in coordination with the MMX mission instrument teams for ground-truthing the remote-sensing data sets. The MMX curation/sample analysis flow enables the seamless integration between the sample and remote-sensing data sets to maximize the scientific value of the collected Phobos samples.

DOI： 10.1111/maps.14121

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Pervasive aqueous alteration in the early Solar System revealed by potassium isotopic variations in Ryugu samples and carbonaceous chondrites

Hu, Y; Moynier, F; Dai, W; Paquet, M; Yokoyama, T; Abe, Y; Aleon, J; Alexander, CMO; Amari, S; Amelin, Y; Bajo, K; Bizzarro, M; Bouvier, A; Carlson, RW; Chaussidon, M; Choi, BG; Dauphas, N; Davis, AM; Di Rocco, T; Fujiya, W; Fukai, R; Gautam, I; Haba, MK; Hibiya, Y; Hidaka, H; Homma, H; Hoppe, P; Huss, GR; Ichida, K; Iizuka, T; Irelandx, TR; Ishikawa, A; Itoh, S; Kawasakii, N; Kita, NT; Kitajima, K; Kleine, T; Komatani, S; Krot, AN; Liu, MC; Masuda, Y; Morita, M; Motomura, K; Nakai, I; Nagashimau, K; Nesvorny, D; Nguyen, A; Nittler, L; Onose, M; Pack, A; Park, C; Piani, L; Qin, LP; Russell, SS; Sakamoto, N; Schönbächler, M; Tafla, L; Tang, HL; Terada, K; Terada, Y; Usui, T; Wadai, S; Wadhwa, M; Walker, RJ; Yamashita, K; Yin, QZ; Yoneda, S; Young, ED; Yui, H; Zhang, AC; Nakamura, T; Naraoka, H; Noguchi, T; Okazaki, R; Sakamoto, K; Yabuta, H; Abe, M; Miyazaki, A; Nakato, A; Nishimura, M; Okada, T; Yada, T; Yogata, K; Nakazawa, S; Saiki, T; Tanaka, S; Terui, F; Tsuda, Y; Watanabe, S; Yoshikawap, M; Tachibana, S; Yurimotoi, H

ICARUS 409 2024.2 （ ISSN:0019-1035 eISSN:1090-2643 ）

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Publisher：Icarus

C-type asteroids are the presumed home to carbonaceous chondrites, some of which contain abundant life-forming volatiles and organics. For the first time, samples from a C-type asteroid (162173 Ryugu) were successfully returned to Earth by JAXA's Hayabusa2 mission. These pristine samples, uncontaminated by the terrestrial environment, allow a direct comparison with carbonaceous chondrites. This study reports the stable K isotopic compositions (expressed as δ41K) of Ryugu samples and seven carbonaceous chondrites to constrain the origin of K isotopic variations in the early Solar System. Three aliquots of Ryugu particles collected at two touchdown sites have identical δ41K values, averaged at −0.194 ± 0.038‰ (2SD). The K isotopic composition of Ryugu falls within the range of δ41K values measured on representative CI chondrites, and together, they define an average δ41K value of −0.185 ± 0.078‰ (2SE), which provides the current best estimate of the K isotopic composition of the bulk Solar System. Samples of CI chondrites with δ41K values that deviate from this range likely reflect terrestrial contaminations or compositional heterogeneities at sampled sizes. In addition to CI chondrites, substantial K isotopic variability is observed in other carbonaceous chondrites and within individual chondritic groups, with δ41K values inversely correlated with K abundances in many cases. These observations indicate widespread fluid activity occurred in chondrite parent bodies, which significantly altered the original K abundances and isotopic compositions of chondrules and matrices established at their accretion.

DOI： 10.1016/j.icarus.2023.115884

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Influx of nitrogen-rich material from the outer Solar System indicated by iron nitride in Ryugu samples

Matsumoto, T; Noguchi, T; Miyake, A; Igami, Y; Haruta, M; Seto, Y; Miyahara, M; Tomioka, N; Saito, H; Hata, S; Harries, D; Takigawa, A; Nakauchi, Y; Tachibana, S; Nakamura, T; Matsumoto, M; Ishii, HA; Bradley, JP; Ohtaki, K; Dobrica, E; Leroux, H; Le Guillou, C; Jacob, D; de la Peña, F; Laforet, S; Marinova, M; Langenhorst, F; Beck, P; Phan, THV; Rebois, R; Abreu, NM; Gray, J; Zega, T; Zanetta, PM; Thompson, MS; Stroud, R; Burgess, K; Cymes, BA; Bridges, JC; Hicks, L; Lee, MR; Daly, L; Bland, PA; Zolensky, ME; Frank, DR; Martinez, J; Tsuchiyama, A; Yasutake, M; Matsuno, J; Okumura, S; Mitsukawa, I; Uesugi, K; Uesugi, M; Takeuchi, A; Sun, MQ; Enju, S; Michikami, T; Yurimoto, H; Okazaki, R; Yabuta, H; Naraoka, H; Sakamoto, K; Yada, T; Nishimura, M; Nakato, A; Miyazaki, A; Yogata, K; Abe, M; Okada, T; Usui, T; Yoshikawa, M; Saiki, T; Tanaka, S; Terui, F; Nakazawa, S; Watanabe, S; Tsuda, Y

NATURE ASTRONOMY 8 ( 2 ) 207 - 215 2024.2 （ ISSN:2397-3366 ）

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Publisher：Nature Astronomy

Large amounts of nitrogen compounds, such as ammonium salts, may be stored in icy bodies and comets, but the transport of these nitrogen-bearing solids into the near-Earth region is not well understood. Here, we report the discovery of iron nitride on magnetite grains from the surface of the near-Earth C-type carbonaceous asteroid Ryugu, suggesting inorganic nitrogen fixation. Micrometeoroid impacts and solar wind irradiation may have caused the selective loss of volatile species from major iron-bearing minerals to form the metallic iron. Iron nitride is a product of nitridation of the iron metal by impacts of micrometeoroids that have higher nitrogen contents than the CI chondrites. The impactors are probably primitive materials with origins in the nitrogen-rich reservoirs in the outer Solar System. Our observation implies that the amount of nitrogen available for planetary formation and prebiotic reactions in the inner Solar System is greater than previously recognized.

DOI： 10.1038/s41550-023-02137-z

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Influx of nitrogen-rich material from the outer Solar System indicated by iron nitride in Ryugu samples

Matsumoto Toru, Noguchi Takaaki, Miyake Akira, Igami Yohei, Haruta Mitsutaka, Seto Yusuke, Miyahara Masaaki, Tomioka Naotaka, Saito Hikaru, Hata Satoshi, Harries Dennis, Takigawa Aki, Nakauchi Yusuke, Tachibana Shogo, Nakamura Tomoki, Matsumoto Megumi, Ishii Hope A., Bradley John P., Ohtaki Kenta, Dobrică Elena, Leroux Hugues, Le Guillou Corentin, Jacob Damien, de la Peña Francisco, Laforet Sylvain, Marinova Maya, Langenhorst Falko, Beck Pierre, Phan Thi H. V., Rebois Rolando, Abreu Neyda M., Gray Jennifer, Zega Thomas, Zanetta Pierre-M., Thompson Michelle S., Stroud Rhonda, Burgess Kate, Cymes Brittany A., Bridges John C., Hicks Leon, Lee Martin R., Daly Luke, Bland Phil A., Zolensky Michael E., Frank David R., Martinez James, Tsuchiyama Akira, Yasutake Masahiro, Matsuno Junya, Okumura Shota, Mitsukawa Itaru, Uesugi Kentaro, Uesugi Masayuki, Takeuchi Akihisa, Sun Mingqi, Enju Satomi, Michikami Tatsuhiro, Yurimoto Hisayoshi, Okazaki Ryuji, Yabuta Hikaru, Naraoka Hiroshi, Sakamoto Kanako, Yada Toru, Nishimura Masahiro, Nakato Aiko, Miyazaki Akiko, Yogata Kasumi, Abe Masanao, Okada Tatsuaki, Usui Tomohiro, Yoshikawa Makoto, Saiki Takanao, Tanaka Satoshi, Terui Fuyuto, Nakazawa Satoru, Watanabe Sei-ichiro, Tsuda Yuichi

Nature Astronomy 8 ( 2 ) 207 - 215 2024.2 （ eISSN:23973366 ）

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Language：English

Large amounts of nitrogen compounds, such as ammonium salts, may be stored in icy bodies and comets, but the transport of these nitrogen-bearing solids into the near-Earth region is not well understood. Here, we report the discovery of iron nitride on magnetite grains from the surface of the near-Earth C-type carbonaceous asteroid Ryugu, suggesting inorganic nitrogen fixation. Micrometeoroid impacts and solar wind irradiation may have caused the selective loss of volatile species from major iron-bearing minerals to form the metallic iron. Iron nitride is a product of nitridation of the iron metal by impacts of micrometeoroids that have higher nitrogen contents than the CI chondrites. The impactors are probably primitive materials with origins in the nitrogen-rich reservoirs in the outer Solar System. Our observation implies that the amount of nitrogen available for planetary formation and prebiotic reactions in the inner Solar System is greater than previously recognized.

CiNii Research
Quantification of bulk elemental composition for C-type asteroid Ryugu samples with nondestructive elemental analysis using muon beam

Ninomiya, K; Osawa, T; Terada, K; Wada, T; Nagasawa, S; Chiu, IH; Nakamura, T; Takahashi, T; Miyake, Y; Kubo, MK; Takeshita, S; Taniguchi, A; Umegaki, I; Watanabe, S; Azuma, T; Katsuragawa, M; Minami, T; Mizumoto, K; Shimomura, K; Takeda, S; Morita, T; Kikuiri, M; Amano, K; Kagawa, E; Furukawa, Y; Yurimoto, H; Noguchi, T; Okazaki, R; Yabuta, H; Naraoka, H; Sakamoto, K; Tachibana, S; Yada, T; Nishimura, M; Nakato, A; Miyazaki, A; Yogata, K; Abe, M; Okada, T; Usui, T; Yoshikawa, M; Saiki, T; Tanaka, S; Terui, F; Nakazawa, S; Watanabe, S; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 59 ( 8 ) 2044 - 2057 2024.1 （ ISSN:1086-9379 eISSN:1945-5100 ）

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Publisher：Meteoritics and Planetary Science

Samples from asteroid Ryugu, brought back by asteroid explorer Hayabusa2, are important for investigating the origin and evolution of the solar system. Here, we report the elemental compositions of a 123-mg Ryugu sample determined with a nondestructive muon elemental analysis method. This method is a powerful tool for determining bulk chemical composition, including light elements such as C, N, and O. From the muonic x-ray spectra with three carbonaceous chondrites, the relationship between the elemental composition and muonic x-ray intensity was determined for each element. Calibration curves showed linearity, and the elemental composition of Ryugu was quantitatively determined. The results reflect the average bulk elemental composition of asteroid Ryugu owing to the large amount of samples. Ryugu has an elemental composition similar to that of Orgueil (CI1) and should be classified as CI1. However, the O/Si ratio of Ryugu is 25% lower than that of Orgueil, indicating that Orgueil may have been seriously contaminated by terrestrial materials after its fall to Earth. These results indicate that the Ryugu sample is more representative than the CI chondrites as a solid material of the solar system.

DOI： 10.1111/maps.14135

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Hydrogen in magnetite from asteroid Ryugu

Aléon, J; Mostefaoui, S; Bureau, H; Vangu, D; Khodja, H; Nagashima, K; Kawasaki, N; Abe, Y; Alexander, CMO; Amari, S; Amelin, Y; Bajo, K; Bizzarro, M; Bouvier, A; Carlson, RW; Chaussidon, M; Choi, BG; Dauphas, N; Davis, AM; Di Rocco, T; Fujiya, W; Fukai, R; Gautam, I; Haba, MK; Hibiya, Y; Hidaka, H; Homma, H; Hoppe, P; Huss, GR; Ichida, K; Iizuka, T; Ireland, TR; Ishikawa, A; Itoh, S; Kita, NT; Kitajima, K; Kleine, T; Komatani, S; Krot, AN; Liu, MC; Masuda, Y; Morita, M; Motomura, K; Moynier, F; Nakai, I; Nguyen, A; Nittler, LR; Onose, M; Pack, A; Park, C; Piani, L; Qin, L; Russell, SS; Sakamoto, N; Schönbächler, M; Tafla, L; Tang, H; Terada, K; Terada, Y; Usui, T; Wada, S; Wadhwa, M; Walker, RJ; Yamashita, K; Yin, QZ; Yokoyama, T; Yoneda, S; Young, ED; Yui, H; Zhang, AC; Nakamura, T; Naraoka, H; Noguchi, T; Okazaki, R; Sakamoto, K; Yabuta, H; Abe, M; Miyazaki, A; Nakato, A; Nishimura, M; Okada, T; Yada, T; Yogata, K; Nakazawa, S; Saiki, T; Tanaka, S; Terui, F; Tsuda, Y; Watanabe, S; Yoshikawa, M; Tachibana, S; Yurimoto, H

METEORITICS & PLANETARY SCIENCE 59 ( 8 ) 2058 - 2072 2024.1 （ ISSN:1086-9379 eISSN:1945-5100 ）

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Publisher：Meteoritics and Planetary Science

In order to gain insights on the conditions of aqueous alteration on asteroid Ryugu and the origin of water in the outer solar system, we developed the measurement of water content in magnetite at the micrometer scale by secondary ion mass spectrometry (NanoSIMS) and determined the H and Si content of coarse-grained euhedral magnetite grains (polyhedral magnetite) and coarse-grained fibrous (spherulitic) magnetite from the Ryugu polished section A0058-C1001. The hydrogen content in magnetite ranges between ~900 and ~3300 wt ppm equivalent water and is correlated with the Si content. Polyhedral magnetite has low and homogenous silicon and water content, whereas fibrous magnetite shows correlated Si and water excesses. These excesses can be explained by the presence of hydrous Si-rich amorphous nanoinclusions trapped during the precipitation of fibrous magnetite away from equilibrium and testify that fibrous magnetite formed from a hydrous gel with possibly more than 20 wt% water. An attempt to determine the water content in sub-μm framboids indicates that additional calibration and contamination issues must be addressed before a safe conclusion can be drawn, but hints at elevated water content as well. The high water content in fibrous magnetite, expected to be among the first minerals to crystallize at low water–rock ratio, points to the control of water content by local conditions of magnetite precipitation rather than large-scale alteration conditions. Systematic lithological variations associated with water-rich and water-poor magnetite suggest that the global context of alteration may be better understood if local water concentrations are compared with millimeter-scale distribution of the various morphologies of magnetite. Finally, the high water content in the magnetite precursor gel indicates that the initial O isotopic composition in alteration water must not have been very different from that of the earliest magnetite crystals.

DOI： 10.1111/maps.14139

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Microstructural and chemical features of impact melts on Ryugu particle surfaces: Records of interplanetary dust hit on asteroid Ryugu

Matsumoto, M; Matsuno, J; Tsuchiyama, A; Nakamura, T; Enokido, Y; Kikuiri, M; Nakato, A; Yasutake, M; Uesugi, K; Takeuchi, A; Enju, S; Okumura, S; Mitsukawa, I; Sun, MQ; Miyake, A; Haruta, M; Igami, Y; Yurimoto, H; Noguchi, T; Okazaki, R; Yabuta, H; Naraoka, H; Sakamoto, K; Tachibana, S; Zolensky, M; Yada, T; Nishimura, M; Miyazaki, A; Yogata, K; Abe, M; Okada, T; Usui, T; Yoshikawa, M; Saiki, T; Tanaka, S; Terui, F; Nakazawa, S; Watanabe, S; Tsuda, Y

SCIENCE ADVANCES 10 ( 3 ) eadi7203 2024.1 （ ISSN:2375-2548 ）

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The Hayabusa2 spacecraft delivered samples of the carbonaceous asteroid Ryugu to Earth. Some of the sample particles show evidence of micrometeoroid impacts, which occurred on the asteroid surface. Among those, particles A0067 and A0094 have flat surfaces on which a large number of microcraters and impact melt splashes are observed. Two impact melt splashes and one microcrater were analyzed to unveil the nature of the objects that impacted the asteroid surface. The melt splashes consist mainly of Mg-Fe–rich glassy silicates and Fe-Ni sulfides. The microcrater trapped an impact melt consisting mainly of Mg-Fe–rich glassy silicate, Fe-Ni sulfides, and minor silica-rich glass. These impact melts show a single compositional trend indicating mixing of Ryugu surface materials and impactors having chondritic chemical compositions. The relict impactor in one of the melt splashes shows mineralogical similarity with anhydrous chondritic interplanetary dust particles having a probable cometary origin. The chondritic micrometeoroids probably impacted the Ryugu surface during its residence in a near-Earth orbit.

DOI： 10.1126/sciadv.adi7203

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The thermal history of Ryugu based on Raman characterization of Hayabusa2 samples

Bonal, L; Quirico, E; Montagnac, G; Komatsu, M; Kebukawa, Y; Yabuta, H; Amano, K; Barosch, J; Bejach, L; Cody, GD; Dartois, E; Dazzi, A; De Gregorio, B; Deniset-Besseau, A; Duprat, J; Engrand, C; Hashiguchi, M; Kamide, K; Kilcoyne, D; Martins, Z; Mathurin, J; Mostefaoui, S; Nittler, L; Ohigashi, T; Okumura, T; Remusat, L; Sandford, S; Shigenaka, M; Stroud, R; Suga, H; Takahashi, Y; Takeichi, Y; Tamenori, Y; Verdier-Paoletti, M; Yamashita, S; Nakamura, T; Naraoka, H; Noguchi, T; Okazaki, R; Yurimoto, H; Tachibana, S; Abe, M; Miyazaki, A; Nakato, A; Nakazawa, S; Nishimura, M; Okada, T; Saiki, T; Sakamoto, K; Tanaka, S; Terui, F; Tsuda, Y; Usui, T; Watanabe, S; Yada, T; Yogata, K; Yoshikawa, M

ICARUS 408 2024.1 （ ISSN:0019-1035 eISSN:1090-2643 ）

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This paper is focused on the characterization of the thermal history of C-type asteroid Ryugu through the structure of the polyaromatic carbonaceous matter in the returned samples determined by Raman spectroscopy. Both intact particles and extracted Insoluble Organic Matter (IOM) from the two sampling sites on Ryugu have been characterized. The main conclusions are that (i) there is no structural difference of the polyaromatic component probed by Raman spectroscopy between the two sampling sites, (ii) in a manner similar to type 1 and 2 chondrites, the characterized Ryugu particles did not experience significant long-duration thermal metamorphism related to the radioactive decay of elements such as 26Al; (iii) some structural variability is nevertheless observed within our particle set. It can be interpreted as some particles having experienced some short-duration and weak heating (R3 in the scale defined by Quirico et al. 2018 and TII or lower according to the scale defined by Nakamura, 2005).

DOI： 10.1016/j.icarus.2023.115826

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In situ investigation of an organic micro-globule and its mineralogical context within a Ryugu "sand" grain

Phan, VH; Beck, P; Rebois, R; Quirico, E; Noguchi, T; Matsumoto, T; Miyake, A; Igami, Y; Haruta, M; Saito, H; Hata, S; Seto, Y; Miyahara, M; Tomioka, N; Ishii, HA; Bradley, JP; Ohtaki, KK; Dobrica, E; Leroux, H; Le Guillou, C; Jacob, D; de la Pena, F; Laforet, S; Marinova, M; Langenhorst, F; Harries, D; Abreu, NM; Gray, J; Zega, T; Zanetta, PM; Thompson, MS; Stroud, R; Mathurin, J; Dazzi, A; Dartois, E; Engrand, C; Burgess, K; Cymes, BA; Bridges, JC; Hicks, L; Lee, MR; Daly, L; Bland, PA; Zolensky, ME; Frank, DR; Martinez, J; Tsuchiyama, A; Yasutake, M; Matsuno, J; Okumura, S; Mitsukawa, I; Uesugi, K; Uesugi, M; Takeuchi, A; Sun, MQ; Enju, S; Takigawa, A; Michikami, T; Nakamura, T; Matsumoto, M; Nakauchi, Y; Abe, M; Nakazawa, S; Okada, T; Saiki, T; Tanaka, S; Terui, F; Yoshikawa, M; Miyazaki, A; Nakato, A; Nishimura, M; Usui, T; Yada, T; Yurimoto, H; Nagashima, K; Kawasaki, N; Sakamotoa, N; Hoppe, P; Okazaki, R; Yabuta, H; Naraoka, H; Sakamoto, K; Tachibana, S; Watanabe, SI; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 59 ( 8 ) 1983 - 2001 2024.1 （ ISSN:1086-9379 eISSN:1945-5100 ）

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Publisher：Meteoritics and Planetary Science

The Hayabusa2 mission from the Japan Aerospace Exploration Agency (JAXA) returned to the Earth samples of carbonaceous asteroid (162173) Ryugu. This mission offers a unique opportunity to investigate in the laboratory samples from a C-type asteroid, without physical or chemical alteration by the terrestrial atmosphere. Here, we report on an investigation of the mineralogy and the organo-chemistry of Hayabusa2 samples using a combination of micro- and nano-infrared spectroscopy. Particles investigated with conventional FTIR spectroscopy have spectra dominated by phyllosilicate-related absorption, as observed for samples of CI-chondrites, selected ungrouped carbonaceous chondrites, and selected hydrated micrometeorites. Ryugu samples show smaller sulfate-related absorption than CI-chondrites. Our samples that were only briefly exposed to the Earth atmosphere show absorptions related to molecular water, revealing fast terrestrial contamination of the spectral signature at 3 μm. Overall, our FTIR data are in agreement with other work done on Ryugu samples, revealing a low degree of mineralogical variability across Ryugu samples. AFM-IR mapping of the grains shows the presence of a micrometer-sized organic globule in one of our analyzed grains. The AFM-IR spectra obtained on this globule are similar to IR spectra obtained on IOM suggesting that it is constituted of refractory organic matter. This globule may host silicate in its interior, with a different mineralogy than bulk Ryugu phyllosilicate. The shape, presence of peculiar silicate, and the nature of organic constituting the globule point toward a pre-accretionary origin of this globule and that at least part of Ryugu organics were inherited from the protosolar nebulae or the interstellar media. Altogether, our results show the similarities between Ryugu samples and CI chondrites.

DOI： 10.1111/maps.14122

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Four-dimensional-STEM analysis of the phyllosilicate-rich matrix of Ryugu samples

Mouloud, BE; Jacob, D; de la Peña, F; Marinova, M; Le Guillou, C; Viennet, JC; Laforet, S; Leroux, H; Teurtrie, A; Noguchi, T; Matsumoto, T; Miyake, A; Igami, Y; Haruta, M; Saito, H; Hata, S; Seto, Y; Miyahara, M; Tomioka, N; Ishii, HA; Bradley, JP; Ohtaki, KK; Dobrica, E; Langenhorst, F; Harries, D; Beck, P; Phan, THV; Rebois, R; Abreu, NM; Gray, J; Zega, T; Zanetta, PM; Thompson, MS; Stroud, R; Burgess, K; Cymes, BA; Bridges, JC; Hicks, L; Lee, MR; Daly, L; Bland, PA; Zolensky, ME; Frank, DR; Martinez, J; Tsuchiyama, A; Yasutake, M; Matsuno, J; Okumura, S; Mitsukawa, I; Uesugi, K; Uesugi, M; Takeuchi, A; Sun, MQ; Enju, S; Takigawa, A; Michikami, T; Nakamura, T; Matsumoto, M; Nakauchi, Y; Abe, M; Nakazawa, S; Okada, T; Saiki, T; Tanaka, S; Terui, F; Yoshikawa, M; Miyazaki, A; Nakato, A; Nishimura, M; Usui, T; Yada, T; Yurimoto, H; Nagashima, K; Kawasaki, N; Sakamotoa, N; Okazaki, R; Yabuta, H; Naraoka, H; Sakamoto, K; Tachibana, S; Watanabe, S; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 59 ( 8 ) 2002 - 2022 2024.1 （ ISSN:1086-9379 eISSN:1945-5100 ）

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Publisher：Meteoritics and Planetary Science

Ryugu asteroid grains brought back to the Earth by the Hayabusa2 space mission are pristine samples containing hydrated minerals and organic compounds. Here, we investigate the mineralogy of their phyllosilicate-rich matrix with four-dimensional scanning transmission electron microscopy (4D-STEM). We have identified and mapped the mineral phases at the nanometer scale (serpentine, smectite, pyrrhotite), observed the presence of Ni-bearing pyrrhotite, and identified the serpentine polymorph as lizardite, in agreement with the reported aqueous alteration history of Ryugu. Furthermore, we have mapped the d-spacings of smectite and observed a broad distribution of values, ranging from 1 to 2 nm, with an average d-spacing of 1.24 nm, indicating significant heterogeneity within the sample. Such d-spacing variability could be the result of either the presence of organic matter trapped in the interlayers or the influence of various geochemical conditions at the submicrometer scale, suggestive of a range of organic compounds and/or changes in smectite crystal chemistry.

DOI： 10.1111/maps.14124

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Analysis of Cation Composition in Dolomites on the Intact Particles Sampled from Asteroid Ryugu

Morita, M; Yui, H; Urashima, S; Onose, M; Komatani, S; Nakai, I; Abe, Y; Terada, Y; Homma, H; Motomura, K; Ichida, K; Yokoyama, T; Nagashima, K; Aléon, J; Alexander, CMO; Amari, S; Amelin, Y; Bajo, K; Bizzarro, M; Bouvier, A; Carlson, RW; Chaussidon, M; Choi, BG; Dauphas, N; Davis, AM; Fujiya, W; Fukai, R; Gautam, I; Haba, MK; Hibiya, Y; Hidaka, H; Hoppe, P; Huss, GR; Iizuka, T; Ireland, TR; Ishikawa, A; Itoh, S; Kawasaki, N; Kita, NT; Kitajima, K; Kleine, T; Krot, S; Liu, MC; Masuda, Y; Moynier, F; Nguyen, A; Nittler, L; Pack, A; Park, C; Piani, L; Qin, LP; Di Rocco, T; Russell, SS; Sakamoto, N; Schönböchler, M; Tafla, L; Tang, HL; Terada, K; Usui, T; Wada, S; Wadhwa, M; Walker, RJ; Yamashita, K; Yin, QZ; Yoneda, S; Young, ED; Zhang, AC; Nakamura, T; Naraoka, H; Noguchi, T; Okazaki, R; Sakamoto, K; Yabuta, H; Abe, M; Miyazaki, A; Nakato, A; Nishimura, M; Okada, T; Yada, T; Yogata, K; Nakazawa, S; Saiki, T; Tanaka, S; Terui, F; Tsuda, Y; Watanabe, SI; Yoshikawa, M; Tachibana, S; Yurimoto, H

ANALYTICAL CHEMISTRY 96 ( 1 ) 170 - 178 2023.12 （ ISSN:0003-2700 eISSN:1520-6882 ）

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Language：English Publisher：Analytical Chemistry

Characterization of the elemental distribution of samples with rough surfaces has been strongly desired for the analysis of various natural and artificial materials. Particularly for pristine and rare analytes with micrometer sizes embedded on specimen surfaces, non-invasive and matrix effect-free analysis is required without surface polishing treatment. To satisfy these requirements, we proposed a new method employing the sequential combination of two imaging modalities, i.e., microenergy-dispersive X-ray fluorescence (micro-XRF) and Raman micro-spectroscopy. The applicability of the developed method is tested by the quantitative analysis of cation composition in micrometer-sized carbonate grains on the surfaces of intact particles sampled directly from the asteroid Ryugu. The first step of micro-XRF imaging enabled a quick search for the sparsely scattered and micrometer-sized carbonates by the codistributions of Ca2+ and Mn2+ on the Mg2+- and Fe2+-rich phyllosilicate matrix. The following step of Raman micro-spectroscopy probed the carbonate grains and analyzed their cation composition (Ca2+, Mg2+, and Fe2+ + Mn2+) in a matrix effect-free manner via the systematic Raman shifts of the lattice modes. The carbonates were basically assigned to ferroan dolomite bearing a considerable amount of Fe2+ + Mn2+ at around 10 atom %. These results are in good accordance with the assignments reported by scanning electron microscopy-energy-dispersive X-ray spectroscopy, where the thin-sectioned and surface-polished Ryugu particles were applicable. The proposed method requires neither sectioning nor surface polishing; hence, it can be applied to the remote sensing apparatus on spacecrafts and planetary rovers. Furthermore, the non-invasive and matrix effect-free characterization will provide a reliable analytical tool for quantitative analysis of the elemental distribution on the samples with surface roughness and chemical heterogeneity at a micrometer scale, such as art paintings, traditional crafts with decorated shapes, as well as sands and rocks with complex morphologies in nature.

DOI： 10.1021/acs.analchem.3c03463

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Polycyclic aromatic hydrocarbons in samples of Ryugu formed in the interstellar medium

Zeichner, SS; Aponte, JC; Bhattacharjee, S; Dong, GN; Hofmann, AE; Dworkin, JP; Glavin, DP; Elsila, JE; Graham, HV; Naraoka, H; Takano, Y; Tachibana, S; Karp, AT; Grice, K; Holman, AI; Freeman, KH; Yurimoto, H; Nakamura, T; Noguchi, T; Okazaki, R; Yabuta, H; Sakamoto, K; Yada, T; Nishimura, M; Nakato, A; Miyazaki, A; Yogata, K; Abe, M; Okada, T; Usui, T; Yoshikawa, M; Saiki, T; Tanaka, S; Terui, F; Nakazawa, S; Watanabe, S; Tsuda, Y; Hamase, K; Fukushima, K; Aoki, D; Hashiguchi, M; Mita, H; Chikaraishi, Y; Ohkouchi, N; Ogawa, NO; Sakai, S; Parker, ET; McLain, HL; Orthous-Daunay, FR; Vuitton, V; Wolters, C; Schmitt-Kopplin, P; Hertkorn, N; Thissen, R; Ruf, A; Isa, J; Oba, Y; Koga, T; Yoshimura, T; Araoka, D; Sugahara, H; Furusho, A; Furukawa, Y; Aoki, J; Kano, K; Nomura, SM; Sasaki, K; Sato, H; Yoshikawa, T; Tanaka, S; Morita, M; Onose, M; Kabashima, F; Fujishima, K; Yamazaki, T; Kimura, Y; Eiler, JM

SCIENCE 382 ( 6677 ) 1411 - 1415 2023.12 （ ISSN:0036-8075 eISSN:1095-9203 ）

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Polycyclic aromatic hydrocarbons (PAHs) contain ≲20% of the carbon in the interstellar medium. They are potentially produced in circumstellar environments (at temperatures ≳1000 kelvin), by reactions within cold (~10 kelvin) interstellar clouds, or by processing of carbon-rich dust grains. We report isotopic properties of PAHs extracted from samples of the asteroid Ryugu and the meteorite Murchison. The doubly-13C substituted compositions (D2×13C values) of the PAHs naphthalene, fluoranthene, and pyrene are 9 to 51% higher than values expected for a stochastic distribution of isotopes. The D2×13C values are higher than expected if the PAHs formed in a circumstellar environment, but consistent with formation in the interstellar medium. By contrast, the PAHs phenanthrene and anthracene in Ryugu samples have D2×13C values consistent with formation by higher-temperature reactions.

DOI： 10.1126/science.adg6304

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Nucleosynthetic s-Process Depletion in Mo from Ryugu samples returned by Hayabusa2

Nakanishi, N; Yokoyama, T; Ishikawa, A; Walker, RJ; Abe, Y; Aléon, J; Alexander, CMO; Amari, S; Amelin, Y; Bajo, KI; Bizzarro, M; Bouvier, A; Carlson, RW; Chaussidon, M; Choi, BG; Dauphas, N; Davis, AM; Di Rocco, T; Fujiya, W; Fukai, R; Gautam, I; Haba, MK; Hibiya, Y; Hidaka, H; Homma, H; Hoppe, P; Huss, GR; Ichida, K; Iizuka, T; Ireland, TR; Itoh, S; Kawasaki, N; Kita, NT; Kitajima, K; Kleine, T; Komatani, S; Krot, AN; Liu, MC; Masuda, Y; Morita, M; Motomura, K; Moynier, F; Nakai, I; Nagashima, K; Nguyen, A; Nittler, L; Onose, M; Pack, A; Park, C; Piani, L; Qin, L; Russell, SS; Sakamoto, N; Schönbächler, M; Tafla, L; Tang, H; Terada, K; Terada, Y; Usui, T; Wada, S; Wadhwa, M; Yamashita, K; Yin, QZ; Yoneda, S; Young, D; Yui, H; Zhang, AC; Nakamura, T; Naraoka, H; Noguchi, T; Okazaki, R; Sakamoto, K; Yabuta, H; Abe, M; Miyazaki, A; Nakato, A; Nishimura, M; Okada, T; Yada, T; Yogata, K; Nakazawa, S; Saiki, T; Tanaka, S; Terui, F; Tsuda, Y; Watanabe, SI; Yoshikawa, M; Tachibana, S; Yurimoto, H

GEOCHEMICAL PERSPECTIVES LETTERS 28 31 - 36 2023.12 （ ISSN:2410-339X eISSN:2410-3403 ）

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Publisher：Geochemical Perspectives Letters

Initial analyses of samples collected from two locations on the asteroid Ryugu indicated that the mineralogical, chemical, and isotopic characteristics of the Ryugu samples show similarities to carbonaceous chondrites, particularly the Ivuna-type (CI) group. In this study, we analysed a composite sample of four bulk Ryugu samples (A0106, A0106-A0107, C0107, and C0108) collected from both sampling locations that were combined in order to determine its mass independent Mo isotopic composition and reveal contributions from diverse nucleosynthetic sources. The ε94Mo and ε95Mo values for the Ryugu sample are characterised by the carbonaceous chondrite (CC)-type, which is consistent with the nucleosynthetic isotope compositions observed for other elements (Cr, Ti, Fe, and Zn). The Ryugu composite sample, however, is characterised by greater s-process depletion of Mo isotopes compared with any known bulk carbonaceous chondrite, even including CI chondrites. The observed Mo isotopic signature in the Ryugu composite was most likely caused by either incomplete digestion of s-process-rich presolar SiC, or biased sampling of materials enriched in aqueously-formed secondary minerals characterised by s-process-poor Mo isotopes, resulting from the physicochemical separation between s-process-rich presolar grains and a complementary s-process-poor aqueous fluid in the Ryugu parent body.

DOI： 10.7185/geochemlet.2341

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Reassigning CI chondrite parent bodies based on reflectance spectroscopy of samples from carbonaceous asteroid Ryugu and meteorites

Amano, K; Matsuoka, M; Nakamura, T; Kagawa, E; Fujioka, Y; Potin, SM; Hiroi, T; Tatsumi, E; Milliken, RE; Quirico, E; Beck, P; Brunetto, R; Uesugi, M; Takahashi, Y; Kawai, T; Yamashita, S; Enokido, Y; Wada, T; Furukawa, Y; Zolensky, ME; Takir, D; Domingue, DL; Jaramillo-Correa, C; Vilas, F; Hendrix, AR; Kikuiri, M; Morita, T; Yurimoto, H; Noguchi, T; Okazaki, R; Yabuta, H; Naraoka, H; Sakamoto, K; Tachibana, S; Yada, T; Nishimura, M; Nakato, A; Miyazaki, A; Yogata, K; Abe, M; Okada, T; Usui, T; Yoshikawa, M; Saiki, T; Tanaka, S; Terui, F; Nakazawa, S; Watanabe, SI; Tsuda, Y

SCIENCE ADVANCES 9 ( 49 ) eadi3789 2023.12 （ ISSN:2375-2548 ）

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Language：English Publisher：Science Advances

The carbonaceous asteroid Ryugu has been explored by the Hayabusa2 spacecraft to elucidate the actual nature of hydrous asteroids. Laboratory analyses revealed that the samples from Ryugu are comparable to unheated CI carbonaceous chondrites; however, reflectance spectra of Ryugu samples and CIs do not coincide. Here, we demonstrate that Ryugu sample spectra are reproduced by heating Orgueil CI chondrite at 300°C under reducing conditions, which caused dehydration of terrestrial weathering products and reduction of iron in phyllosilicates. Terrestrial weathering of CIs accounts for the spectral differences between Ryugu sample and CIs, which is more severe than space weathering that likely explains those between asteroid Ryugu and the collected samples. Previous assignments of CI chondrite parent bodies, i.e., chemically most primitive objects in the solar system, are based on the spectra of CI chondrites. This study indicates that actual spectra of CI parent bodies are much darker and flatter at ultraviolet to visible wavelengths than the spectra of CI chondrites.

DOI： 10.1126/sciadv.adi3789

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Neodymium-142 deficits and samarium neutron stratigraphy of C-type asteroid (162173) Ryugu

Torrano, ZA; Jordan, MK; Mock, TD; Carlson, RW; Gautam, I; Haba, MK; Yokoyama, T; Abe, Y; Aléon, J; Alexander, C; Amari, S; Amelin, Y; Bajo, K; Bizzarro, M; Bouvier, A; Chaussidon, M; Choi, BG; Dauphas, N; Davis, AM; Di Rocco, T; Fujiya, W; Fukai, R; Hibiya, Y; Hidaka, H; Homma, H; Hoppe, P; Huss, GR; Ichida, K; Iizuka, T; Ireland, T; Ishikawa, A; Itoh, S; Kawasaki, N; Kita, NT; Kitajima, K; Kleine, T; Komatani, S; Krot, AN; Liu, MC; Masuda, Y; Mckeegan, KD; Morita, M; Motomura, K; Moynier, F; Nakai, I; Nagashima, K; Nguyen, A; Nittler, L; Onose, M; Pack, A; Park, C; Piani, L; Qin, LP; Russell, S; Sakamoto, N; Schönbächler, M; Tafla, L; Tang, HL; Terada, K; Terada, Y; Usui, T; Wada, S; Wadhwa, M; Walker, RJ; Yamashita, K; Yin, QZ; Yoneda, S; Young, ED; Yui, H; Zhang, AC; Nakamura, T; Naraoka, H; Noguchi, T; Okazaki, R; Sakamoto, K; Yabuta, H; Abe, M; Miyazaki, A; Nakato, A; Nishimura, M; Okada, T; Yada, T; Yogata, K; Nakazawa, S; Saiki, T; Tanaka, S; Terui, F; Tsuda, Y; Watanabe, S; Yoshikawa, M; Tachibana, S; Yurimoto, H

METEORITICS & PLANETARY SCIENCE 59 ( 8 ) 1966 - 1982 2023.12 （ ISSN:1086-9379 eISSN:1945-5100 ）

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We report Nd and Sm isotopic compositions of four samples of Ryugu returned by the Hayabusa2 mission, including “A” (first touchdown) and “C” (second touchdown) samples, and several carbonaceous chondrites to evaluate potential genetic relationships between Ryugu and known chondrite groups and track the cosmic ray exposure history of Ryugu. We resolved Nd and Sm isotopic anomalies in small (<20 ng Nd and Sm) sample sizes via thermal ionization mass spectrometer using 1013 Ω amplifiers. Ryugu samples exhibit resolvable negative μ142Nd values consistent with carbonaceous chondrite values, suggesting that Ryugu is related to the parent bodies of carbonaceous chondrites. Ryugu's negative μ149Sm values are the result of exposure to galactic cosmic rays, as demonstrated by the correlation between 150Sm/152Sm and 149Sm/152Sm ratios that fall along the expected neutron capture correlation line. The neutron fluence calculated in the “A” samples (2.75 ± 1.94 × 1015 n cm−2) is slightly higher compared to the “C” samples (0.95 ± 2.04 × 1015 n cm−2), though overlapping within measurement uncertainty. The Sm results for Ryugu, at this level of precision, thus are consistent with a well-mixed surface layer at least to the depths from which the “A” and “C” samples derive.

DOI： 10.1111/maps.14109

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The Magnesium Isotope Composition of Samples Returned from Asteroid Ryugu

Bizzarro, M; Schiller, M; Yokoyama, T; Abe, Y; Aléon, J; O'D Alexander, CM; Amari, S; Amelin, Y; Bajo, K; Bouvier, A; Carlson, RW; Chaussidon, M; Choi, BG; Dauphas, N; Davis, AM; Di Rocco, T; Fujiya, W; Fukai, R; Gautam, I; Haba, MK; Hibiya, Y; Hidaka, H; Homma, H; Hoppe, P; Huss, GR; Ichida, K; Iizuka, T; Ireland, TR; Ishikawa, A; Itoh, S; Kawasaki, N; Kita, NT; Kitajima, K; Kleine, T; Komatani, S; Krot, AN; Liu, MC; Masuda, Y; Morita, M; Moynier, F; Motomura, K; Nakai, I; Nagashima, K; Nesvorny, D; Nguyen, A; Nittler, L; Onose, M; Pack, A; Park, C; Piani, L; Qin, LP; Russell, SS; Sakamoto, N; Schönbächler, M; Tafla, L; Tang, HL; Terada, K; Terada, Y; Usui, T; Wada, S; Wadhwa, M; Walker, RJ; Yamashita, K; Yin, QZ; Yoneda, S; Young, ED; Yui, H; Zhang, AC; Nakamura, T; Naraoka, H; Noguchi, T; Okazaki, R; Sakamoto, K; Yabuta, H; Abe, M; Miyazaki, A; Nakato, A; Nishimura, M; Okada, T; Yada, T; Yogata, K; Nakazawa, S; Saiki, T; Tanaka, S; Terui, F; Tsuda, Y; Watanabe, S; Yoshikawa, M; Tachibana, S; Yurimoto, H

ASTROPHYSICAL JOURNAL LETTERS 958 ( 2 ) 2023.12 （ ISSN:2041-8205 eISSN:2041-8213 ）

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Publisher：Astrophysical Journal Letters

The nucleosynthetic isotope composition of planetary materials provides a record of the heterogeneous distribution of stardust within the early solar system. In 2020 December, the Japan Aerospace Exploration Agency Hayabusa2 spacecraft returned to Earth the first samples of a primitive asteroid, namely, the Cb-type asteroid Ryugu. This provides a unique opportunity to explore the kinship between primitive asteroids and carbonaceous chondrites. We report high-precision μ 26Mg* and μ 25Mg values of Ryugu samples together with those of CI, CM, CV, and ungrouped carbonaceous chondrites. The stable Mg isotope composition of Ryugu aliquots defines μ 25Mg values ranging from -160 ± 20 ppm to -272 ± 30 ppm, which extends to lighter compositions relative to Ivuna-type (CI) and other carbonaceous chondrite groups. We interpret the μ 25Mg variability as reflecting heterogeneous sampling of a carbonate phase hosting isotopically light Mg (μ 25Mg ∼ -1400 ppm) formed by low temperature equilibrium processes. After correcting for this effect, Ryugu samples return homogeneous μ 26Mg* values corresponding to a weighted mean of 7.1 ± 0.8 ppm. Thus, Ryugu defines a μ 26Mg* excess relative to the CI and CR chondrite reservoirs corresponding to 3.8 ± 1.1 and 11.9 ± 0.8 ppm, respectively. These variations cannot be accounted for by in situ decay of 26Al given their respective 27Al/24Mg ratios. Instead, it requires that Ryugu and the CI and CR parent bodies formed from material with a different initial 26Al/27Al ratio or that they are sourced from material with distinct Mg isotope compositions. Thus, our new Mg isotope data challenge the notion that Ryugu and CI chondrites share a common nucleosynthetic heritage.

DOI： 10.3847/2041-8213/ad09d9

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PAHs, hydrocarbons, and dimethylsulfides in Asteroid Ryugu samples A0106 and C0107 and the Orgueil (CI1) meteorite Reviewed International journal

Earth, Planets and Space 75 ( 1 ) article id.28 2023.12 （ ISSN:13438832 eISSN:1880-5981 ）

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1186/s40623-022-01758-4

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Small grains from Ryugu: handling and analysis pipeline for infrared synchrotron microspectroscopy Reviewed International journal

Earth, Planets and Space 75 ( 1 ) 2023.12 （ ISSN:13438832 eISSN:1880-5981 ）

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1186/s40623-022-01762-8

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Evidence of global space weathering by solar wind on asteroid 162173 Ryugu

Hiroi, T; Milliken, RE; Robertson, KM; Schultz, CD; Amano, K; Nakamura, T; Yurimoto, H; Noguchi, T; Okazaki, R; Naraoka, H; Yabuta, H; Sakamoto, K; Yada, T; Nishimura, M; Nakato, A; Miyazaki, A; Yogata, K; Abe, M; Okada, T; Usui, T; Yoshikawa, M; Saiki, T; Tanaka, S; Nakazawa, S; Yokota, Y; Tatsumi, E; Tsuda, Y; Tachibana, S; Fuyuto, T; Watanabe, S; Sasaki, S; Kaiden, H; Kitazato, K; Matsuoka, M

ICARUS 406 2023.12 （ ISSN:0019-1035 eISSN:1090-2643 ）

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Publisher：Icarus

Reflectance spectra (0.3–4 μm) of powder samples of the third largest stone C0002 returned from the asteroid Ryugu by JAXA Hayabusa2 mission were measured and compared with proximity observation data taken by the Optical Navigation Camera - Telescopic (ONC-T) and the Near-Infrared Spectrometer (NIRS3) onboard the Hayabusa2 spacecraft. Although the characteristics of the 2.7 μm absorption band due to structural hydroxyl of the Ryugu powder samples are consistent with CI1 chondrite meteorites, NIRS3 spectra of the global surface of Ryugu exhibit a wavelength shift of +6 nm in the 2.7 μm absorption band center in comparison with those of both the powder samples and an artificial crater on the asteroid formed by the Small Carry-on Impactor (SCI). This is consistent with effects of solar wind-induced space weathering being present across the global surface of asteroid Ryugu. The darkness of the Ryugu surface in comparison with the returned samples and an upturn in reflectance observed in the average ONC-T spectrum at ultraviolet wavelengths may also be due to space weathering.

DOI： 10.1016/j.icarus.2023.115755

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Mineralogy and petrology of fine-grained samples recovered from the asteroid (162173) Ryugu

Noguchi, T; Matsumoto, T; Miyake, A; Igami, Y; Haruta, M; Saito, H; Hata, S; Seto, Y; Miyahara, M; Tomioka, N; Ishii, HA; Bradley, JP; Ohtaki, KK; Dobrica, E; Leroux, H; Le Guillou, C; Jacob, D; de la Peña, F; Laforet, S; Mouloud, BE; Marinova, M; Langenhorst, F; Harries, D; Beck, P; Phan, THV; Rebois, R; Abreu, NM; Gray, J; Zega, T; Zanetta, PM; Thompson, MS; Stroud, R; Burgess, K; Cymes, BA; Bridges, JC; Hicks, L; Lee, MR; Daly, L; Bland, PA; Smith, WA; Mcfadzean, S; Martin, PE; Bagot, PAJ; Fougerouse, D; Saxey, DW; Reddy, S; Rickard, WDA; Zolensky, ME; Frank, DR; Martinez, J; Tsuchiyama, A; Yasutake, M; Matsuno, J; Okumura, S; Mitsukawa, I; Uesugi, K; Uesugi, M; Takeuchi, A; Sun, MQ; Enju, S; Takigawa, A; Michikami, T; Nakamura, T; Matsumoto, M; Nakauchi, Y; Abe, M; Nakazawa, S; Okada, T; Saiki, T; Tanaka, S; Terui, F; Yoshikawa, M; Miyazaki, A; Nakato, A; Nishimura, M; Usui, T; Yada, T; Yurimoto, H; Nagashima, K; Kawasaki, N; Sakamotoa, N; Hoppe, P; Okazaki, R; Yabuta, H; Naraoka, H; Sakamoto, K; Tachibana, S; Watanabe, S; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 59 ( 8 ) 1877 - 1906 2023.11 （ ISSN:1086-9379 eISSN:1945-5100 ）

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Publisher：Meteoritics and Planetary Science

Samples returned from the carbonaceous asteroid (162173) Ryugu by the Hayabusa2 mission revealed that Ryugu is composed of materials consistent with CI chondrites and some types of space weathering. We report detailed mineralogy of the fine-grained Ryugu samples allocated to our “Sand” team and report additional space weathering features found on the grains. The dominant mineralogy is composed of a fine-grained mixture of Mg-rich saponite and serpentine, magnetite, pyrrhotite, pentlandite, dolomite, and Fe-bearing magnesite. These grains have mineralogy comparable to that of CI chondrites, showing severe aqueous alteration but lacking ferrihydrite and sulfate. These results are similar to previous works on large Ryugu grains. In addition to the major minerals, we also find many minerals that are rare or have not been reported among CI chondrites. Accessory minerals identified are hydroxyapatite, Mg-Na phosphate, olivine, low-Ca pyroxene, Mg-Al spinel, chromite, manganochromite, eskolaite, ilmenite, cubanite, polydymite, transjordanite, schreibersite, calcite, moissanite, and poorly crystalline phyllosilicate. We also show scanning transmission electron microscope and scanning electron microscope compositional maps and images of some space-weathered grains and severely heated and melted grains. Although our mineralogical results are consistent with that of millimeter-sized grains, the fine-grained fraction is best suited to investigate impact-induced space weathering.

DOI： 10.1111/maps.14093

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The iron oxidation state of Ryugu samples

Roskosz, M; Beck, P; Viennet, JC; Nakamura, T; Lavina, B; Hu, MY; Zhao, JY; Alp, EE; Takahashi, Y; Morita, T; Amano, K; Yurimoto, H; Noguchi, T; Okazaki, R; Yabuta, H; Naraoka, H; Sakamoto, K; Tachibana, S; Yada, T; Nishimura, M; Nakato, A; Miyazaki, A; Yogata, K; Abe, M; Okada, T; Usui, T; Yoshikawa, M; Saiki, T; Tanaka, S; Terui, F; Nakazawa, S; Watanabe, SI; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 59 ( 8 ) 1925 - 1946 2023.11 （ ISSN:1086-9379 eISSN:1945-5100 ）

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Publisher：Meteoritics and Planetary Science

The Hayabusa2 mission sampled Ryugu, an asteroid that did not suffer extensive thermal metamorphism, and returned rocks to the Earth with no significant air exposure. It therefore offers a unique opportunity to study the redox state of carbonaceous Cb-type asteroids and evaluate the overall redox state of the most primitive rocks of the solar system. An analytical framework was developed to investigate the iron mineralogy and valence state in extraterrestrial material at the micron scale by combining x-ray diffraction, conventional Mössbauer (MS), and nuclear forward scattering (NFS) spectroscopies. An array of standard minerals was analyzed and cross-calibrated between MS and NFS. Then, MS and NFS spectra on three Ryugu grains were collected at the bulk and the micron scales. In Ryugu samples, iron is essentially accommodated in magnetite, clay minerals (serpentine–smectite), and sulfides. Only a single set of Mössbauer parameters was necessary to account for the entire variability observed in MS and NFS spectra, at all spatial scales investigated. These parameters therefore make up a fully consistent iron mineralogical model for the Ryugu samples. As far as MS and NFS spectroscopies are concerned, Ryugu grains are overall similar to each other and share most of their mineralogical features with CI-type chondrites. In detail however, no ferrihydrite is found in Ryugu particles even at the very sensitive scale of Mössbauer spectroscopy. The typical Fe3+/Fetot of clay minerals is much lower than typical redox ratios measured in CI chondrites (Fe3+/Fetot = 85%–90%). Furthermore, magnetite from Ryugu is stoichiometric with no significant maghemite component, whereas up to 12% of maghemite was previously identified in the Orgueil's so-called magnetite. These differences suggest that most CI meteorites suffered terrestrial alteration and that the preterrestrial composition of these carbon-rich samples was less oxidized than previously measured. However, it is not clear yet whether or not the parent bodies of CI chondrites were as reduced as Ryugu. Finally, the high spatial resolution of NFS allows to disentangle the redox state and the crystal chemistry of iron accommodated in serpentine and smectite. The most likely polytype of serpentine is lizardite, containing <35% of Fe3+, a fraction of which being tetrahedrally coordinated. Smectite is more oxidized (Fe3+/Fetot > 65%) and mainly contains octahedral ferric iron. This finding implies that these clays formed from highly alkaline fluids and the spatial variability highlighted here may suggest a temporal evolution or a spatial variability of the nature of this fluid.

DOI： 10.1111/maps.14098

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A curation for uncontaminated Hayabusa2-returned samples in the extraterrestrial curation center of JAXA: from the beginning to present day

Yada, T; Abe, M; Nishimura, M; Sawada, H; Okazaki, R; Takano, Y; Sakamoto, K; Okada, T; Nakato, A; Yoshitake, M; Nakano, Y; Yogata, K; Miyazaki, A; Furuya, S; Iwamae, AS; Nakatsubo, S; Hatakeda, K; Hitomi, Y; Kumagai, K; Suzuki, S; Miura, YN; Ito, M; Tomioka, N; Uesugi, M; Karouji, Y; Uesugi, K; Shirai, N; Yamaguchi, A; Imae, N; Naraoka, H; Yamamoto, Y; Tachibana, S; Yurimoto, H; Usui, T

EARTH PLANETS AND SPACE 75 ( 1 ) 2023.11 （ ISSN:13438832 eISSN:1880-5981 ）

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Publisher：Earth, Planets and Space

Developing a cleanroom and clean chambers (CCs) for Hayabusa2 returned samples has been discussed with the committee for Hayabusa2 sample curation facility since 2015. One major difference from the specifications of the CCs used for Itokawa samples is that a part of samples was decided to be handled and preserved in vacuum to avoid terrestrial nitrogen contamination with organics or unknown materials that might easily react with the samples. Thus, the CCs for Hayabusa2 samples were divided into two CCs for vacuum processes and three CCs for purified nitrogen conditions. The cleanroom was built in summer 2017, while the CCs were installed in the summer of 2018. After the installation of the CCs, instruments for initial descriptions, sample containers, handling tools for powder and particle samples, and jigs to assist handling samples were developed in parallel with functional checks and repeated rehearsals between the fall of 2018 and the fall of 2020. The curatorial works on Hayabusa2-retuned samples were conducted as previously planned. Simultaneously, contaminations and influences of inorganics, organics, microbial, and magnetic constructs have been assessed to evaluate their potential effects on the analysis of the returned samples. Additionally, the tools used to touch samples directly have been demagnetized to avoid sample magnetization during their handling and the tool magnetization was measured before and after their usages. The series of developments and experiences from the curatorial works of Hayabusa2-returned samples represent valuable implications for future sample return missions. Graphical Abstract: [Figure not available: see fulltext.].

DOI： 10.1186/s40623-023-01924-2

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Phyllosilicates with embedded Fe-based nanophases in Ryugu and Orgueil

Leroux, H; Le Guillou, C; Marinova, M; Laforet, S; Viennet, JC; Mouloud, BE; Teurtrie, A; de la Peña, F; Jacob, D; Hallatt, D; Fernandez, MP; Troadec, D; Noguchi, T; Matsumoto, T; Miyake, A; Igami, Y; Haruta, M; Saito, H; Hata, S; Seto, Y; Miyahara, M; Tomioka, N; Ishii, HA; Bradley, JP; Ohtaki, KK; Dobrica, E; Langenhorst, F; Harries, D; Beck, P; Phan, THV; Rebois, R; Abreu, NM; Gray, J; Zega, T; Zanetta, PM; Thompson, MS; Stroud, R; Burgess, K; Cymes, BA; Bridges, JC; Hicks, L; Lee, MR; Daly, L; Bland, PA; Zolensky, ME; Frank, DR; Martinez, J; Tsuchiyama, A; Yasutake, M; Matsuno, J; Okumura, S; Mitsukawa, I; Uesugi, K; Uesugi, M; Takeuchi, A; Sun, MQ; Enju, S; Takigawa, A; Michikami, T; Nakamura, T; Matsumoto, M; Nakauchi, Y; Abe, M; Nakazawa, S; Okada, T; Saiki, T; Tanaka, S; Terui, F; Yoshikawa, M; Miyazaki, A; Nakato, A; Nishimura, M; Usui, T; Yada, T; Yurimoto, H; Nagashima, K; Kawasaki, N; Sakamotoa, N; Okazaki, R; Yabuta, H; Naraoka, H; Sakamoto, K; Tachibana, S; Watanabe, SI; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 59 ( 8 ) 1947 - 1965 2023.11 （ ISSN:1086-9379 eISSN:1945-5100 ）

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Publisher：Meteoritics and Planetary Science

Samples were recently collected from the carbonaceous asteroid (162173) Ryugu, by the Japan Aerospace Exploration Agency (JAXA) Hayabusa2 mission. They resemble CI chondrites material, thus showing clear evidence of extensive aqueous alteration attested by the widespread presence of a mixture of serpentine and saponite. We present here a scanning transmission electron microscopy study of the Ryugu dominant lithology of the phyllosilicate matrix at the nanometer scale, which we compare with that of the Orgueil CI chondrite. In both objects, the phyllosilicates are of comparable nature and texture, consisting of a mixture of small-sized crystallites of serpentine and saponite. At the micrometer scale or less, the texture is an alternation of fine and coarse domains. The fine-grained regions are dominated by saponite. In Ryugu, they enclose numerous Fe,Ni nanosulfides, whereas in Orgueil, S- and Ni-rich ferrihydrite is abundant. The coarse-grained regions contain more serpentine and no or little Fe,Ni sulfides or ferrihydrite. Scanning transmission x-ray microscopy at the Fe-L3 edge also reveals that iron valency of phyllosilicates is higher and more homogeneous in Orgueil (~70% Fe3+) than in Ryugu (<50% Fe3+). We interpret the observed textures as being mostly a consequence of aqueous alteration, likely resulting from the replacement by phyllosilicates of submicrometric components, initially agglomerated by a primary accretion. The fine-grained domains may result from the replacement of GEMS (GEMS—glass with embedded metal and sulfides) objects or from other types of nanometric assemblages of silicate and Fe-based nanophases. On the other hand, the coarse-grained regions may correspond to the replacement of anhydrous crystalline silicates of the olivine and pyroxene type. The major difference is the presence of Fe,Ni sulfides in Ryugu and of ferrihydrite and higher iron valency of phyllosilicates in Orgueil. This might be due to long-term terrestrial weathering that would have destabilized the nanosulfides. We also explore an alternative scenario involving more oxidizing hydrothermal conditions on the Orgueil parent body.

DOI： 10.1111/maps.14101

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Compositional heterogeneity of insoluble organic matter extracted from asteroid Ryugu samples

Quirico, E; Bonal, L; Kebukawa, Y; Amano, K; Yabuta, H; Phan, VH; Beck, P; Remusat, L; Dartois, E; Engrand, C; Martins, Z; Bejach, L; Dazzi, A; Deniset-Besseau, A; Duprat, J; Mathurin, J; Montagnac, G; Barosch, J; Cody, GD; De Gregorio, B; Enokido, Y; Hashiguchi, M; Kamide, K; Kilcoyne, D; Komatsu, M; Matsumoto, M; Mostefaoui, S; Nittler, L; Ohigashi, T; Okumura, T; Sandford, S; Shigenaka, M; Stroud, R; Suga, H; Takahashi, Y; Takeichi, Y; Tamenori, Y; Verdier-Paoletti, M; Wakabayashi, D; Yamashita, S; Nakamura, T; Naraoka, H; Noguchi, T; Okazaki, R; Yurimoto, H; Sakamoto, K; Tachibana, S; Watanabe, SI; Tsuda, Y; Yada, T; Nishimura, M; Nakato, A; Miyazaki, A; Yogata, K; Abe, M; Okada, T; Usui, T; Yoshikawa, M; Saiki, T; Tanaka, S; Terui, F; Nakazawa, S

METEORITICS & PLANETARY SCIENCE 59 ( 8 ) 1907 - 1924 2023.11 （ ISSN:1086-9379 eISSN:1945-5100 ）

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Publisher：Meteoritics and Planetary Science

We report a Fourier transform infrared analysis of functional groups in insoluble organic matter (IOM) extracted from a series of 100–500 μm Ryugu grains collected during the two touchdowns of February 22 and July 11, 2019. IOM extracted from most of the samples is very similar to IOM in primitive CI, CM, and CR chondrites, and shows that the extent of thermal metamorphism in Ryugu regolith was, at best, very limited. One sample displays chemical signatures consistent with a very mild heating, likely due to asteroidal collision impacts. We also report a lower carbonyl abundance in Ryugu IOM samples compared to primitive chondrites, which could reflect the accretion of a less oxygenated precursor by Ryugu. The possible effects of hydrothermal alteration and terrestrial weathering are also discussed. Last, no firm conclusions could be drawn on the origin of the soluble outlier phases, observed along with IOM in this study and in the preliminary analysis of Ryugu samples. However, it is clear that the HF/HCl residues presented in this publication are a mix between IOM and the nitrogen-rich outlier phase.

DOI： 10.1111/maps.14097

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Water circulation in Ryugu asteroid affected the distribution of nucleosynthetic isotope anomalies in returned sample

Yokoyama, T; Wadhwa, M; Iizuka, T; Rai, V; Gautam, I; Hibiya, Y; Masuda, Y; Haba, MK; Fukai, R; Hines, R; Phelan, N; Abe, Y; Aléon, J; Alexander, CMO; Amari, S; Amelin, Y; Bajo, K; Bizzarro, M; Bouvier, A; Carlson, RW; Chaussidon, M; Choi, BG; Dauphas, N; Davis, AM; Di Rocco, T; Fujiya, W; Hidaka, H; Homma, H; Hoppe, P; Huss, GR; Ichida, K; Ireland, T; Ishikawa, A; Itoh, S; Kawasaki, N; Kita, NT; Kitajima, K; Kleine, T; Komatani, S; Krot, AN; Liu, MC; McKeegan, KD; Morita, M; Motomura, K; Moynier, F; Nakai, I; Nagashima, K; Nguyen, A; Nittler, L; Onose, M; Pack, A; Park, C; Piani, L; Qin, LP; Russell, S; Sakamoto, N; Schönbächler, M; Tafla, L; Tang, HL; Terada, K; Terada, Y; Usui, T; Wada, S; Walker, RJ; Yamashita, K; Yin, QZ; Yoneda, S; Young, ED; Yui, H; Zhang, AC; Nakamura, T; Naraoka, H; Noguchi, T; Okazaki, R; Sakamoto, K; Yabuta, H; Abe, M; Miyazaki, A; Nakato, A; Nishimura, M; Okada, T; Yada, T; Yogata, K; Nakazawa, S; Saiki, T; Tanaka, S; Terui, F; Tsuda, Y; Watanabe, S; Yoshikawa, M; Tachibana, S; Yurimoto, H

SCIENCE ADVANCES 9 ( 45 ) eadi7048 2023.11 （ ISSN:2375-2548 ）

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Language：English Publisher：Science Advances

Studies of material returned from Cb asteroid Ryugu have revealed considerable mineralogical and chemical heterogeneity, stemming primarily from brecciation and aqueous alteration. Isotopic anomalies could have also been affected by delivery of exogenous clasts and aqueous mobilization of soluble elements. Here, we show that isotopic anomalies for mildly soluble Cr are highly variable in Ryugu and CI chondrites, whereas those of Ti are relatively uniform. This variation in Cr isotope ratios is most likely due to physicochemical fractionation between 54Cr-rich presolar nanoparticles and Cr-bearing secondary minerals at the millimeter-scale in the bulk samples, likely due to extensive aqueous alteration in their parent bodies that occurred 5:2þ11::84 Ma after Solar System birth. In contrast, Ti isotopes were marginally affected by this process. Our results show that isotopic heterogeneities in asteroids are not all nebular or accretionary in nature but can also reflect element redistribution by water.

DOI： 10.1126/sciadv.adi7048

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Soluble organic matter Molecular atlas of Ryugu reveals cold hydrothermalism on C-type asteroid parent body

Schmitt-Kopplin, P; Hertkorn, N; Harir, M; Moritz, F; Lucio, M; Bonal, L; Quirico, E; Takano, Y; Dworkin, JP; Naraoka, H; Tachibana, S; Nakamura, T; Noguchi, T; Okazaki, R; Yabuta, H; Yurimoto, H; Sakamoto, K; Yada, T; Nishimura, M; Nakato, A; Miyazaki, A; Yogata, K; Abe, M; Usui, T; Yoshikawa, M; Saiki, T; Tanaka, S; Terui, F; Nakazawa, S; Okada, T; Watanabe, S; Tsuda, Y

NATURE COMMUNICATIONS 14 ( 1 ) 6525 2023.10 （ eISSN:2041-1723 ）

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Language：English Publisher：Nature Communications

The sample from the near-Earth carbonaceous asteroid (162173) Ryugu is analyzed in the context of carbonaceous meteorites soluble organic matter. The analysis of soluble molecules of samples collected by the Hayabusa2 spacecraft shines light on an extremely high molecular diversity on the C-type asteroid. Sequential solvent extracts of increasing polarity of Ryugu samples are analyzed using mass spectrometry with complementary ionization methods and structural information confirmed by nuclear magnetic resonance spectroscopy. Here we show a continuum in the molecular size and polarity, and no organomagnesium molecules are detected, reflecting a low temperature and water-rich environment on the parent body approving earlier mineralogical and chemical data. High abundance of sulfidic and nitrogen rich compounds as well as high abundance of ammonium ions confirm the water processing. Polycyclic aromatic hydrocarbons are also detected in a structural continuum of carbon saturations and oxidations, implying multiple origins of the observed organic complexity, thus involving generic processes such as earlier carbonization and serpentinization with successive low temperature aqueous alteration.

DOI： 10.1038/s41467-023-42075-y

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Space weathering acts strongly on the uppermost surface of Ryugu

Matsuoka, M; Kagawa, E; Amano, K; Nakamura, T; Tatsumi, E; Osawa, T; Hiroi, T; Milliken, R; Domingue, D; Takir, D; Brunetto, R; Barucci, A; Kitazato, K; Sugita, S; Fujioka, Y; Sasaki, O; Kobayashi, S; Iwata, T; Morota, T; Yokota, Y; Kouyama, T; Honda, R; Kameda, S; Cho, Y; Yoshioka, K; Sawada, H; Hayakawa, M; Sakatani, N; Yamada, M; Suzuki, H; Honda, C; Ogawa, K; Shirai, K; Lantz, C; Rubino, S; Yurimoto, H; Noguchi, T; Okazaki, R; Yabuta, H; Naraoka, H; Sakamoto, K; Tachibana, S; Yada, T; Nishimura, M; Nakato, A; Miyazaki, A; Yogata, K; Abe, M; Okada, T; Usui, T; Yoshikawa, M; Saiki, T; Tanaka, S; Terui, F; Nakazawa, S; Watanabe, S; Tsuda, Y

COMMUNICATIONS EARTH & ENVIRONMENT 4 ( 1 ) 2023.9 （ eISSN:2662-4435 ）

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Publisher：Communications Earth and Environment

Returned samples from Cb-type asteroid (162173) Ryugu exhibit very dark spectra in visible and near-infrared ranges, generally consistent with the Hayabusa2 observations. A critical difference is that a structural water absorption of hydrous silicates is around twice as deep in the returned samples compared with those of Ryugu’s surface, suggesting Ryugu surface is more dehydrated. Here we use laboratory experiments data to indicate the spectral differences between returned samples and asteroid surface are best explained if Ryugu surface has (1) higher porosity, (2) larger particle size, and (3) more space-weathered condition, with the last being the most effective. On Ryugu, space weathering by micrometeoroid bombardments promoting dehydration seem to be more effective than that by solar-wind implantation. Extremely homogeneous spectra of the Ryugu’s global surface is in contrast with the heterogeneous S-type asteroid (25143) Itokawa’s spectra, which suggests space weathering has proceeded more rapidly on Cb-type asteroids than S-type asteroids.

DOI： 10.1038/s43247-023-00991-3

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Chemical evolution of primordial salts and organic sulfur molecules in the asteroid 162173 Ryugu

Yoshimura, T; Takano, Y; Naraoka, H; Koga, T; Araoka, D; Ogawa, NO; Schmitt-Kopplin, P; Hertkorn, N; Oba, Y; Dworkin, JP; Aponte, JC; Yoshikawa, T; Tanaka, S; Ohkouchi, N; Hashiguchi, M; Mclain, H; Parker, ET; Sakai, S; Yamaguchi, M; Suzuki, T; Yokoyama, T; Yurimoto, H; Nakamura, T; Noguchi, T; Okazaki, R; Yabuta, H; Sakamoto, K; Yada, T; Nishimura, M; Nakato, A; Miyazaki, A; Yogata, K; Abe, M; Okada, T; Usui, T; Yoshikawa, M; Saiki, T; Tanaka, S; Terui, F; Nakazawa, S; Watanabe, SI; Tsuda, Y; Tachibana, S; Hamase, K; Furusho, A; Fukushima, K; Aoki, D; Glavin, DP; Mclain, HL; Elsila, JE; Graham, HV; Eiler, JM; Ruf, A; Orthous-Daunay, FR; Wolters, C; Isa, J; Morita, M; Vuitton, V; Thissen, R; Nomura, SM; Sugahara, H; Mita, H; Furukawa, Y; Chikaraishi, Y; Onose, M; Kabashima, F; Fujishima, K; Sato, H; Sasaki, K; Kano, K; Aoki, J; Yamazaki, T; Kimura, Y

NATURE COMMUNICATIONS 14 ( 1 ) 5284 2023.9 （ eISSN:2041-1723 ）

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Language：English Publisher：Nature Communications

Samples from the carbonaceous asteroid (162173) Ryugu provide information on the chemical evolution of organic molecules in the early solar system. Here we show the element partitioning of the major component ions by sequential extractions of salts, carbonates, and phyllosilicate-bearing fractions to reveal primordial brine composition of the primitive asteroid. Sodium is the dominant electrolyte of the salt fraction extract. Anions and NH4+ are more abundant in the salt fraction than in the carbonate and phyllosilicate fractions, with molar concentrations in the order SO42−> Cl−> S2O32−> NO3−> NH4+. The salt fraction extracts contain anionic soluble sulfur-bearing species such as S n-polythionic acids (n < 6), C n-alkylsulfonates, alkylthiosulfonates, hydroxyalkylsulfonates, and hydroxyalkylthiosulfonates (n < 7). The sulfur-bearing soluble compounds may have driven the molecular evolution of prebiotic organic material transforming simple organic molecules into hydrophilic, amphiphilic, and refractory S allotropes.

DOI： 10.1038/s41467-023-40871-0

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Three-dimensional multiscale assembly of phyllosilicates, organics, and carbonates in small Ryugu fragments

Dionnet, Z; Rubino, S; Aléon-Toppani, A; Brunetto, R; Tsuchiyama, A; Lantz, C; Djouadi, Z; Baklouti, D; Nakamura, T; Borondics, F; Sandt, C; Heripre, E; Troadec, D; Mivumbi, O; Aléon, J; Ternier, T; Matsumoto, M; Amano, K; Morita, T; Yurimoto, H; Noguchi, T; Okazaki, R; Yabuta, H; Naraoka, H; Sakamoto, K; Tachibana, S; Yada, T; Nishimura, M; Nakato, A; Miyazaki, A; Yogata, K; Abe, M; Okada, T; Usui, T; Yoshikawa, M; Saiki, T; Tanaka, S; Terui, F; Nakazawa, S; Watanabe, S; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 59 ( 8 ) 1859 - 1876 2023.9 （ ISSN:1086-9379 eISSN:1945-5100 ）

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Publisher：Meteoritics and Planetary Science

We report μm-scale nondestructive infrared (IR) hyperspectral results (IR computed tomography, IR-CT) in 3-D and IR surface imaging, IR-S) in 2-D, at SOLEIL) combined with X-ray nano-computed tomography analyses (at SPring-8) performed on eight small Ryugu fragments extracted from mm-sized grains coming both from touchdown first and second sites. We describe the multiscale assembly of phyllosilicates, carbonates, sulfides, oxides, and organics. Two types of silicates, as well as diverse kinds of organic matter, were detected inside Ryugu material. Their spatial correlations are described to discuss the role of the mineralogical microenvironments in the formation/evolution of organic matter. In particular, we have shown that there is a redistribution of the organic matter diffuse component during aqueous alteration on the parent body, with a preferential circulation among fine-grained phyllosilicates.

DOI： 10.1111/maps.14068

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Noble gas mass-spectrometry for extraterrestrial micro-samples: analyses of asteroid matter returned by Hayabusa2 JAXA mission

Meshik, A; Pravdivtseva, O; Okazaki, R; Yogata, K; Yada, T; Kitajima, F; Yurimoto, H; Nakamura, T; Noguchi, T; Yabuta, H; Naraoka, H; Sakamoto, K; Tachibana, S; Nishimura, M; Nakato, A; Miyazaki, A; Abe, M; Okada, T; Usui, T; Yoshikawa, M; Sakai, T; Tanaka, S; Terui, F; Nakazawa, S; Watanabe, S; Tsuda, Y

JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY 38 ( 9 ) 1785 - 1797 2023.8 （ ISSN:0267-9477 eISSN:1364-5544 ）

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Publisher：Journal of Analytical Atomic Spectrometry

Mass spectrometry of noble gas isotopes extracted from limited amounts of extraterrestrial materials delivered by robotic space missions requires high sensitivity, high ion transmission, low detection limit, and several other characteristics not readily available in commercial instruments. We compared two different configurations of electron impact ionisation. We concluded that the ion source with cylindrical symmetry and without a magnetic field in the ionisation region is better for analyzing all stable noble gas isotopes extracted from sub-milligram extraterrestrial samples. Isotopic analyses of noble gases retrieved using multi-step heating of sub-mg samples delivered from near-Earth (162 173) asteroid Ryugu support this conclusion.

DOI： 10.1039/d3ja00125c

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Visualization of nanoscale magnetic domain states in the asteroid Ryugu

Kimura, Y; Kato, T; Tanigaki, T; Akashi, T; Kasai, H; Anada, S; Yoshida, R; Yamamoto, K; Nakamura, T; Sato, M; Amano, K; Kikuiri, M; Morita, T; Kagawa, E; Yada, T; Nishimura, M; Nakato, A; Miyazaki, A; Yogata, K; Abe, M; Okada, T; Usui, T; Yoshikawa, M; Saiki, T; Tanaka, S; Terui, F; Nakazawa, S; Yurimoto, H; Noguchi, T; Okazaki, R; Yabuta, H; Naraoka, H; Sakamoto, K; Watanabe, SI; Tsuda, Y; Tachibana, S

SCIENTIFIC REPORTS 13 ( 1 ) 14096 2023.8 （ ISSN:2045-2322 ）

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Language：English Publisher：Scientific Reports

In the samples collected from the asteroid Ryugu, magnetite displays natural remanent magnetization due to nebular magnetic field, whereas contemporaneously grown iron sulfide does not display stable remanent magnetization. To clarify this counterintuitive feature, we observed their nanoscale magnetic domain structures using electron holography and found that framboidal magnetites have an external magnetic field of 300 A m−1, similar to the bulk value, and its magnetic stability was enhanced by interactions with neighboring magnetites, permitting a disk magnetic field to be recorded. Micrometer-sized pyrrhotite showed a multidomain magnetic structure that was unable to retain natural remanent magnetization over a long time due to short relaxation time of magnetic-domain-wall movement, whereas submicron-sized sulfides formed a nonmagnetic phase. These results show that both magnetite and sulfide could have formed simultaneously during the aqueous alteration in the parent body of the asteroid Ryugu.

DOI： 10.1038/s41598-023-41242-x

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Infrared absorption spectra from organic matter in the asteroid Ryugu samples: Some unique properties compared to unheated carbonaceous chondrites

Kebukawa, Y; Quirico, E; Dartois, E; Yabuta, H; Bejach, L; Bonal, L; Dazzi, A; Deniset-Besseau, A; Duprat, J; Engrand, C; Mathurin, J; Barosch, J; Cody, GD; De Gregorio, B; Hashiguchi, M; Kamide, K; Kilcoyne, D; Komatsu, M; Martins, Z; Montagnac, G; Mostefaoui, S; Nittler, LR; Ohigashi, T; Okumura, T; Remusat, L; Sandford, S; Shigenaka, M; Stroud, R; Suga, H; Takahashi, Y; Takeichi, Y; Tamenori, Y; Verdier-Paoletti, M; Wakabayashi, D; Yamashita, S; Yurimoto, H; Nakamura, T; Noguchi, T; Okazaki, R; Naraoka, H; Sakamoto, K; Tachibana, S; Yada, T; Nishimura, M; Nakato, A; Miyazaki, A; Yogata, K; Abe, M; Okada, T; Usui, T; Yoshikawa, M; Saiki, T; Tanaka, S; Terui, F; Nakazawa, S; Watanabe, S; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 59 ( 8 ) 1845 - 1858 2023.8 （ ISSN:1086-9379 eISSN:1945-5100 ）

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Publisher：Meteoritics and Planetary Science

The infrared spectral characteristics of organic-rich acid residues prepared from Ryugu samples returned by the JAXA Hayabusa2 mission generally match those from unheated carbonaceous chondrite meteorites, but the residues from Ryugu are richer in methyl and methylene functional groups and have higher CH2/CH3 ratios. Moreover, two distinct outlier carbonaceous phases are found; one with spectral characteristics of N-H functional groups, likely amides, and a second phase containing less nitrogen. Such infrared characteristics of Ryugu organic matter might indicate the pristine nature of the freshly collected samples and reflect the near-surface chemistry in the parent asteroid.

DOI： 10.1111/maps.14064

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The Oxygen Isotopic Composition of Samples Returned from Asteroid Ryugu with Implications for the Nature of the Parent Planetesimal

Tang, HL; Young, ED; Tafla, L; Pack, A; Di Rocco, T; Abe, Y; Aleon, J; Alexander, CMO; Amari, S; Amelin, Y; Bajo, K; Bizzarro, M; Bouvier, A; Carlson, RW; Chaussidon, M; Choi, BG; Dauphas, N; Davis, AM; Fujiya, W; Fukai, R; Gautam, I; Haba, MK; Hibiya, Y; Hidaka, H; Homma, H; Hoppe, P; Huss, GR; Ichida, K; Iizuka, T; Ireland, TR; Ishikawa, A; Ito, M; Itoh, S; Kawasaki, N; Kita, NT; Kitajima, K; Kleine, T; Komatani, S; Krot, AN; Liu, MC; Masuda, Y; McKeegan, KD; Morita, M; Motomura, K; Moynier, F; Nagashima, K; Nakai, I; Nguyen, A; Nittler, L; Onose, M; Park, C; Piani, L; Qin, LP; Russell, SS; Sakamoto, N; Schoenbaechler, M; Terada, K; Terada, Y; Usui, T; Wada, S; Wadhwa, M; Walker, RJ; Yamashita, K; Yin, QZ; Yokoyama, T; Yoneda, S; Yui, H; Zhang, AC; Nakamura, T; Naraoka, H; Noguchi, T; Okazaki, R; Sakamoto, K; Yabuta, H; Abe, M; Miyazaki, A; Nakato, A; Nishimura, M; Okada, T; Yada, T; Yogata, K; Nakazawa, S; Saiki, T; Tanaka, S; Terui, F; Tsuda, Y; Watanabe, SI; Yoshikawa, M; Tachibana, S; Yurimoto, H

PLANETARY SCIENCE JOURNAL 4 ( 8 ) 2023.8 （ eISSN:2632-3338 ）

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We present oxygen isotopic analyses of fragments of the near-Earth Cb-type asteroid Ryugu returned by the Hayabusa2 spacecraft that reinforce the close correspondence between Ryugu and CI chondrites. Small differences between Ryugu samples and CI chondrites in D¢17O can be explained at least in part by contamination of the latter by terrestrial water. The discovery that a randomly sampled C-complex asteroid is composed of CI-chondrite-like rock, combined with thermal models for formation prior to significant decay of the short-lived radioisotope 26Al, suggests that if lithified at the time of alteration, the parent body was small (=50 km radius). If the parent planetesimal was large (>50 km in radius), it was likely composed of high-permeability, poorly lithified sediment rather than consolidated rock.

DOI： 10.3847/PSJ/acea62

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Carbonate record of temporal change in oxygen fugacity and gaseous species in asteroid Ryugu

Fujiya, W; Kawasaki, N; Nagashima, K; Sakamoto, N; Alexander, CMO; Kita, NT; Kitajima, K; Abe, Y; Aléon, J; Amari, S; Amelin, Y; Bajo, K; Bizzarro, M; Bouvier, A; Carlson, RW; Chaussidon, M; Choi, BG; Dauphas, N; Davis, AM; Di Rocco, T; Fukai, R; Gautam, I; Haba, MK; Hibiya, Y; Hidaka, H; Homma, H; Hoppe, P; Huss, GR; Ichida, K; Iizuka, T; Ireland, TR; Ishikawa, A; Itoh, S; Kleine, T; Komatani, S; Krot, AN; Liu, MC; Masuda, Y; McKeegan, KD; Morita, M; Motomura, K; Moynier, F; Nakai, I; Nguyen, A; Nittler, L; Onose, M; Pack, A; Park, C; Piani, L; Qin, LP; Russell, SS; Schönbächler, M; Tafla, L; Tang, HL; Terada, K; Terada, Y; Usui, T; Wada, S; Wadhwa, M; Walker, RJ; Yamashita, K; Yin, QZ; Yokoyama, T; Yoneda, S; Young, ED; Yui, H; Zhang, AC; Nakamura, T; Naraoka, H; Noguchi, T; Okazaki, R; Sakamoto, K; Yabuta, H; Abe, M; Miyazaki, A; Nakato, A; Nishimura, M; Okada, T; Yada, T; Yogata, K; Nakazawa, S; Saiki, T; Tanaka, S; Terui, F; Tsuda, Y; Watanabe, S; Yoshikawa, M; Tachibana, S; Yurimoto, H

NATURE GEOSCIENCE 16 ( 8 ) 675 - + 2023.8 （ ISSN:1752-0894 eISSN:1752-0908 ）

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Publisher：Nature Geoscience

The Hayabusa2 spacecraft explored asteroid Ryugu and brought its surface materials to Earth. Ryugu samples resemble Ivuna-type (CI) chondrites—the most chemically primitive meteorites—and contain secondary phyllosilicates and carbonates, which are indicative of aqueous alteration. Understanding the conditions (such as temperature, redox state and fluid composition) during aqueous alteration is crucial to elucidating how Ryugu evolved to its present state, but little is known about the temporal changes in these conditions. Here we show that calcium carbonate (calcite) grains in Ryugu and Ivuna samples have variable 18O/16O and 13C/12C ratios that are, respectively, 24–46‰ and 65–108‰ greater than terrestrial standard values, whereas those of calcium–magnesium carbonate (dolomite) grains are much more homogeneous, ranging within 31–36‰ for oxygen and 67–75‰ for carbon. We infer that the calcite precipitated first over a wide range of temperatures and oxygen partial pressures, and that the proportion of gaseous CO2/CO/CH4 molecules changed temporally. By contrast, the dolomite formed later in a more oxygen-rich and thus CO2-dominated environment when the system was approaching equilibrium. The characteristic isotopic compositions of secondary carbonates in Ryugu and Ivuna are not observed for other hydrous meteorites, suggesting a unique evolutionary pathway for their parent asteroid(s).

DOI： 10.1038/s41561-023-01226-y

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COSMIC RAY IRRADIATION RECORD OF WILLARD (B) H CHONDRITE

Tobimatsu, Y; Okazaki, R

METEORITICS & PLANETARY SCIENCE 58 A299 - A299 2023.8 （ ISSN:1086-9379 eISSN:1945-5100 ）

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Ryugu's Anhydrous Ingredients and Their Spectral Link to Primitive Dust from the Outer Solar System

Brunetto, R; Lantz, C; Fukuda, Y; Aléon-Toppani, A; Nakamura, T; Dionnet, Z; Baklouti, D; Borondics, F; Djouadi, Z; Rubino, S; Amano, K; Matsumoto, M; Fujioka, Y; Morita, T; Kukuiri, M; Kagawa, E; Matsuoka, M; Milliken, R; Yurimoto, H; Noguchi, T; Okazaki, R; Yabuta, H; Naraoka, H; Sakamoto, K; Tachibana, S; Yada, T; Nishimura, M; Nakato, A; Miyazaki, A; Yogata, K; Abe, M; Okada, T; Usui, T; Yoshikawa, M; Saiki, T; Tanaka, S; Terui, F; Nakazawa, S; Watanabe, S; Tsuda, Y

ASTROPHYSICAL JOURNAL LETTERS 951 ( 2 ) 2023.7 （ ISSN:2041-8205 eISSN:2041-8213 ）

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Publisher：Astrophysical Journal Letters

Ryugu is a second-generation C-type asteroid formed by the reassembly of fragments of a previous larger body in the main asteroid belt. While the majority of Ryugu samples returned by Hayabusa2 are composed of a lithology dominated by aqueously altered minerals, clasts of pristine olivine and pyroxene remain in the least-altered lithologies. These clasts are objects of great interest for revealing the composition of the dust from which the original building blocks of Ryugu's parent asteroid formed. Here we show that some grains rich in olivine, pyroxene, and amorphous silicates discovered in one millimeter-sized stone of Ryugu have infrared spectra similar to the D-type asteroid Hektor (a Jupiter Trojan), to comet Hale-Bopp, and to some anhydrous interplanetary dust particles of probable cometary origin. This result indicates that Ryugu's primary parent body incorporated anhydrous ingredients similar to the building blocks of asteroids (and possibly some comets) formed in the outer solar system, and that Ryugu retained valuable information on the formation and evolution of planetesimals at different epochs of our solar system's history.

DOI： 10.3847/2041-8213/acdf5c

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Abundant presolar grains and primordial organics preserved in carbon-rich exogenous clasts in asteroid Ryugu

Nguyen, AN; Mane, P; Keller, LP; Piani, L; Abe, Y; Aléon, J; Alexander, CMO; Amari, S; Amelin, Y; Bajo, KI; Bizzarro, M; Bouvier, A; Carlson, RW; Chaussidon, M; Choi, BG; Dauphas, N; Davis, AM; Di Rocco, T; Fujiya, W; Fukai, R; Gautam, I; Haba, MK; Hibiya, Y; Hidaka, H; Homma, H; Hoppe, P; Huss, GR; Ichida, K; Iizuka, T; Ireland, TR; Ishikawa, A; Itoh, S; Kawasaki, N; Kita, NT; Kitajima, K; Kleine, T; Komatani, S; Krot, AN; Liu, MC; Masuda, Y; McKeegan, KD; Morita, M; Motomura, K; Moynier, F; Nakai, I; Nagashima, K; Nesvorny, D; Nittler, L; Onose, M; Pack, A; Park, C; Qin, LP; Russell, SS; Sakamoto, N; Schönbächler, M; Tafla, L; Tang, HL; Terada, K; Terada, Y; Usui, T; Wada, S; Wadhwa, M; Walker, RJ; Yamashita, K; Yin, QZ; Yokoyama, T; Yoneda, S; Young, ED; Yui, H; Zhang, AC; Nakamura, T; Naraoka, H; Noguchi, T; Okazaki, R; Sakamoto, K; Yabuta, H; Abe, M; Miyazaki, A; Nakato, A; Nishimura, M; Okada, T; Yada, T; Yogata, K; Nakazawa, S; Saiki, T; Tanaka, S; Terui, F; Tsuda, Y; Watanabe, SI; Yoshikawa, M; Tachibana, S; Yurimoto, H

SCIENCE ADVANCES 9 ( 28 ) eadh1003 2023.7 （ ISSN:2375-2548 ）

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Language：English Publisher：Science Advances

Preliminary analyses of asteroid Ryugu samples show kinship to aqueously altered CI (Ivuna-type) chondrites, suggesting similar origins. We report identification of C-rich, particularly primitive clasts in Ryugu samples that contain preserved presolar silicate grains and exceptional abundances of presolar SiC and isotopically anomalous organic matter. The high presolar silicate abundance (104 ppm) indicates that the clast escaped extensive alteration. The 5 to 10 times higher abundances of presolar SiC (~235 ppm), N-rich organic matter, organics with N isotopic anomalies (1.2%), and organics with C isotopic anomalies (0.2%) in the primitive clasts compared to bulk Ryugu suggest that the clasts formed in a unique part of the protoplanetary disk enriched in presolar materials. These clasts likely represent previously unsampled outer solar system material that accreted onto Ryugu after aqueous alteration ceased, consistent with Ryugu’s rubble pile origin.

DOI： 10.1126/sciadv.adh1003

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Phoenix "Hayabusa": A tale of the future (29) - Analyses of volatile compositions of Hayabusa2 samples ‒

Okazaki R.

Planetary People - The Japanese Society for Planetary Sciences 32 ( 2 ) 133 - 138 2023.6 （ ISSN:0918273X eISSN:2423897X ）

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Language：Japanese Publisher：The Japanese Society for Planetary Sciences

DOI： 10.14909/yuseijin.32.2_133

CiNii Research
The spatial distribution of soluble organic matter and their relationship to minerals in the asteroid (162173) Ryugu

Hashiguchi, M; Aoki, D; Fukushima, K; Naraoka, H; Takano, Y; Dworkin, JP; Dworkin, KE; Aponte, JC; Elsila, JE; Eiler, JM; Furukawa, Y; Furusho, A; Glavin, DP; Graham, HV; Hamase, K; Hertkorn, N; Isa, J; Koga, T; McLain, HL; Mita, H; Oba, Y; Ogawa, NO; Ohkouchi, N; Orthous-Daunay, FR; Parker, ET; Ruf, A; Sakai, S; Schmitt-Kopplin, P; Sugahara, H; Thissen, R; Vuitton, V; Wolters, C; Yoshimura, T; Yurimoto, H; Nakamura, T; Noguchi, T; Okazaki, R; Yabuta, H; Sakamoto, K; Tachibana, S; Yada, T; Nishimura, M; Nakato, A; Miyazaki, A; Yogata, K; Abe, M; Usui, T; Yoshikawa, M; Saiki, T; Tanaka, S; Terui, F; Nakazawa, S; Watanabe, SI; Tsuda, Y

EARTH PLANETS AND SPACE 75 ( 1 ) 2023.5 （ ISSN:13438832 eISSN:1880-5981 ）

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Publisher：Earth, Planets and Space

We performed in-situ analysis on a ~ 1 mm-sized grain A0080 returned by the Hayabusa2 spacecraft from near-Earth asteroid (162173) Ryugu to investigate the relationship of soluble organic matter (SOM) to minerals. Desorption electrospray ionization-high resolution mass spectrometry (DESI-HRMS) imaging mapped more than 200 CHN, CHO, CHO–Na (sodium adducted), and CHNO soluble organic compounds. A heterogeneous spatial distribution was observed for different compound classes of SOM as well as among alkylated homologues on the sample surface. The A0080 sample showed mineralogy more like an Ivuna-type (CI) carbonaceous chondrite than other meteorites. It contained two different lithologies, which are either rich (lithology 1) or poor (lithology 2) in magnetite, pyrrhotite, and dolomite. CHN compounds were more concentrated in lithology 1 than in lithology 2; on the other hand, CHO, CHO–Na, and CHNO compounds were distributed in both lithologies. Such different spatial distribution of SOM is likely the result of interaction of the SOM with minerals, during precipitation of the SOM via fluid activity, or could be due to difference in transportation efficiencies of SOMs in aqueous fluid. Organic-related ions measured by time-of-flight secondary ion mass spectrometry (ToF–SIMS) did not coincide with the spatial distribution revealed by DESI-HRMS imaging. This result may be because the different ionization mechanism between DESI and SIMS, or indicate that the ToF–SIMS data would be mainly derived from methanol-insoluble organic matter in A0080. In the Orgueil meteorite, such relationship between altered minerals and SOM distributions was not observed by DESI-HRMS analysis and field-emission scanning electron microscopy, which would result from differences of SOM formation processes and sequent alteration process on the parent bodies or even on the Earth. Alkylated homologues of CHN compounds were identified in A0080 by DESI-HRMS imaging as observed in the Murchison meteorite, but not from the Orgueil meteorite. These compounds with a large C number were enriched in Murchison fragments with abundant carbonate grains. In contrast, such relationship was not observed in A0080, implying different formation or growth mechanisms for the alkylated CHN compounds by interaction with fluid and minerals on the Murchison parent body and asteroid Ryugu. Graphical Abstract: [Figure not available: see fulltext.]

DOI： 10.1186/s40623-023-01792-w

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Hydrogen Isotopic Composition of Hydrous Minerals in Asteroid Ryugu Reviewed International journal

The Astrophysical Journal Letters 946 ( 2 ) 2023.4 （ ISSN:2041-8205 eISSN:2041-8213 ）

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DOI： 10.3847/2041-8213/acc393

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Measurement of Microscopic Thermal Diffusivity Distribution for Ryugu Sample by Infrared Lock-in Periodic Heating Method Reviewed International journal

Ishizaki, Takuya; Nagano, Hosei; Tanaka, Satoshi; Sakatani, Naoya; Nakamura, Tomoki; Okada, Tatsuaki; Fujita, Ryohei; Alasli, Abdulkareem; Morita, Tomoyo; Kikuiri, Mizuha; Amano, Kana; Kagawa, Eiichi; Yurimoto, Hisayoshi; Noguchi, Takaaki; @Okazaki, Ryuji; Yabuta, Hikaru; Naraoka, Hiroshi; Sakamoto, Kanako; Tachibana, Shogo; Watanabe, Sei-ichiro; Tsuda, Yuichi

International Journal of Thermophysics 44 ( 4 ) 2023.4 （ ISSN:0195-928X eISSN:1572-9567 ）

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DOI： 10.1007/s10765-023-03158-6

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Extraterrestrial amino acids and amines identified in asteroid Ryugu samples returned by the Hayabusa2 mission Reviewed International journal

Geochimica et Cosmochimica Acta 347 42 - 57 2023.4 （ ISSN:0016-7037 eISSN:1872-9533 ）

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DOI： 10.1016/j.gca.2023.02.017

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Nonequilibrium spherulitic magnetite in the Ryugu samples Reviewed International journal

Geochimica et Cosmochimica Acta 346 65 - 75 2023.4 （ ISSN:0016-7037 eISSN:1872-9533 ）

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DOI： 10.1016/j.gca.2023.02.003

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Chemical composition of carbonaceous asteroid Ryugu from synchrotron spectroscopy in the mid- to far-infrared of Hayabusa2-returned samples Reviewed International journal

Astronomy & Astrophysics 671 2023.3 （ ISSN:0004-6361 eISSN:1432-0746 ）

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DOI： 10.1051/0004-6361/202244702

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Uracil in the carbonaceous asteroid (162173) Ryugu Reviewed International journal

Oba, Yasuhiro; Koga, Toshiki; Takano, Yoshinori; Ogawa, Nanako O.; Ohkouchi, Naohiko; Sasaki, Kazunori; Sato, Hajime; Glavin, Daniel P.; Dworkin, Jason P.; Naraoka, Hiroshi; Tachibana, Shogo; Yurimoto, Hisayoshi; Nakamura, Tomoki; Noguchi, Takaaki; @Okazaki, Ryuji; Yabuta, Hikaru; Sakamoto, Kanako; Yada, Toru; Nishimura, Masahiro; Nakato, Aiko; Miyazaki, Akiko; Yogata, Kasumi; Abe, Masanao; Okada, Tatsuaki; Usui, Tomohiro; Yoshikawa, Makoto; Saiki, Takanao; Tanaka, Satoshi; Terui, Fuyuto; Nakazawa, Satoru; Watanabe, Sei-ichiro; Tsuda, Yuichi; Hayabusa2-initial-analysis SOM team

Nature Communications 14 ( 1 ) 1292 2023.3 （ eISSN:2041-1723 ）

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DOI： 10.1038/s41467-023-36904-3

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Author Correction: Contribution of Ryugu-like material to Earth's volatile inventory by Cu and Zn isotopic analysis Reviewed International journal

Nature Astronomy 2023.3

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DOI： 10.1038/s41550-023-01938-6
Interaction between clay minerals and organics in asteroid Ryugu Reviewed International journal

Viennet, J. -C.; Roskosz, M.; Nakamura, T.; Beck, P.; Baptiste, B.; Lavina, B.; Alp, E. E.; Hu, M. Y.; Zhao, J.; Gounelle, M.; Brunetto, R.; Yurimoto, H.; Noguchi, T.; @Okazaki, R.; Yabuta, H.; Naraoka, H.; Sakamoto, K.; Tachibana, S.; Yada, T.; Nishimura, M.; Nakato, A.; Miyazaki, A.; Yogata, K.; Abe, M.; Okada, T.; Usui, T.; Yoshikawa, M.; Saiki, T.; Tanaka, S.; Terui, F.; Nakazawa, S.; Watanabe, S. -I.; Tsuda, Y.

Geochemical Perspectives Letters 25 8 - 12 2023.3 （ ISSN:2410-339X eISSN:2410-3403 ）

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DOI： 10.7185/geochemlet.2307

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Macromolecular organic matter in samples of the asteroid (162173) Ryugu

Yabuta, H; Cody, GD; Engrand, C; Kebukawa, Y; De Gregorio, B; Bonal, L; Remusat, L; Stroud, R; Quirico, E; Nittler, L; Hashiguchi, M; Komatsu, M; Okumura, T; Mathurin, J; Dartois, E; Duprat, J; Takahashi, Y; Takeichi, Y; Kilcoyne, D; Yamashita, S; Dazzi, A; Deniset-Besseau, A; Sandford, S; Martins, Z; Tamenori, Y; Ohigashi, T; Suga, H; Wakabayashi, D; Verdier-Paoletti, M; Mostefaoui, S; Montagnac, G; Barosch, J; Kamide, K; Shigenaka, M; Bejach, L; Matsumoto, M; Enokido, Y; Noguchi, T; Yurimoto, H; Nakamura, T; Okazaki, R; Naraoka, H; Sakamoto, K; Connolly, HC Jr; Lauretta, DS; Abe, M; Okada, T; Yada, T; Nishimura, M; Yogata, K; Nakato, A; Yoshitake, M; Iwamae, A; Furuya, S; Hatakeda, K; Miyazaki, A; Soejima, H; Hitomi, Y; Kumagai, K; Usui, T; Hayashi, T; Yamamoto, D; Fukai, R; Sugita, S; Kitazato, K; Hirata, N; Honda, R; Morota, T; Tatsumi, E; Sakatani, N; Namiki, N; Matsumoto, K; Noguchi, R; Wada, K; Senshu, H; Ogawa, K; Yokota, Y; Ishihara, Y; Shimaki, Y; Yamada, M; Honda, C; Michikami, T; Matsuoka, M; Hirata, N; Arakawa, M; Okamoto, C; Ishiguro, M; Jaumann, R; Bibring, JP; Grott, M; Schröder, S; Otto, K; Pilorget, C; Schmitz, N; Biele, J; Ho, TM; Moussi-Soffys, A; Miura, A; Noda, H; Yamada, T; Yoshihara, K; Kawahara, K; Ikeda, H; Yamamoto, Y; Shirai, K; Kikuchi, S; Ogawa, N; Takeuchi, H; Ono, G; Mimasu, Y; Yoshikawa, K; Takei, Y; Fujii, A; Iijima, Y; Nakazawa, S; Hosoda, S; Iwata, T; Hayakawa, M; Sawada, H; Yano, H; Tsukizaki, R; Ozaki, M; Terui, F; Tanaka, S; Fujimoto, M; Yoshikawa, M; Saiki, T; Tachibana, S; Watanabe, S; Tsuda, Y

SCIENCE 379 ( 6634 ) 790 - + 2023.2 （ ISSN:0036-8075 eISSN:1095-9203 ）

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Language：English Publisher：Science

Samples of the carbonaceous asteroid (162173) Ryugu were collected and brought to Earth by the Hayabusa2 spacecraft. We investigated the macromolecular organic matter in Ryugu samples and found that it contains aromatic and aliphatic carbon, ketone, and carboxyl functional groups. The spectroscopic features of the organic matter are consistent with those in chemically primitive carbonaceous chondrite meteorites that experienced parent-body aqueous alteration (reactions with liquid water). The morphology of the organic carbon includes nanoglobules and diffuse carbon associated with phyllosilicate and carbonate minerals. Deuterium and/or nitrogen-15 enrichments indicate that the organic matter formed in a cold molecular cloud or the presolar nebula. The diversity of the organic matter indicates variable levels of aqueous alteration on Ryugu’s parent body.

DOI： 10.1126/science.abn9057

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Contribution of Ryugu-like material to Earth's volatile inventory by Cu and Zn isotopic analysis Reviewed International journal

Nature Astronomy 7 ( 2 ) 182 - 189 2023.2 （ ISSN:2397-3366 ）

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1038/s41550-022-01846-1

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Chondrule-like objects and Ca-Al-rich inclusions in Ryugu may potentially be the oldest Solar System materials Reviewed International journal

Nakashima, Daisuke; Nakamura, Tomoki; Zhang, Mingming; Kita, Noriko T.; Mikouchi, Takashi; Yoshida, Hideto; Enokido, Yuma; Morita, Tomoyo; Kikuiri, Mizuha; Amano, Kana; Kagawa, Eiichi; Yada, Toru; Nishimura, Masahiro; Nakato, Aiko; Miyazaki, Akiko; Yogata, Kasumi; Abe, Masanao; Okada, Tatsuaki; Usui, Tomohiro; Yoshikawa, Makoto; Saiki, Takanao; Tanaka, Satoshi; Nakazawa, Satoru; Terui, Fuyuto; Yurimoto, Hisayoshi; Noguchi, Takaaki; Yabuta, Hikaru; Naraoka, Hiroshi; @Okazaki, Ryuji; Sakamoto, Kanako; Watanabe, Sei-ichiro; Tachibana, Shogo; Tsuda, Yuichi

Nature Communications 14 ( 1 ) 532 2023.2 （ eISSN:2041-1723 ）

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DOI： 10.1038/s41467-023-36268-8

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PubMed
Rare earth element identification and quantification in millimetre-sized Ryugu rock fragments from the Hayabusa2 space mission Reviewed International journal

Tack, Pieter; De Pauw, Ella; Tkalcec, Beverley; Lindner, Miles; Bazi, Benjamin; Vekemans, Bart; Brenker, Frank; Di Michiel, Marco; Uesugi, Masayuki; Yurimoto, Hisayoshi; Nakamura, Tomoki; Amano, Kana; Matsumoto, Megumi; Fujioka, Yuri; Enokido, Yuma; Nakashima, Daisuke; Noguchi, Takaaki; @Okazaki, Ryuji; Yabuta, Hikaru; Naraoka, Hiroshi; Sakamoto, Kanako; Tachibana, Shogo; Yada, Toru; Nishimura, Masahiro; Nakato, Aiko; Miyazaki, Akiko; Yogata, Kasumi; Abe, Masanao; Okada, Tatsuaki; Usui, Tomohiro; Yoshikawa, Makoto; Saiki, Takanao; Tanaka, Satoshi; Terui, Fuyuto; Nakazawa, Satoru; Watanabe, Sei-Ichiro; Tsuda, Yuichi; Vincze, Laszlo

Earth, Planets and Space 74 ( 1 ) 146 2022.12 （ ISSN:13438832 eISSN:1880-5981 ）

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DOI： 10.1186/s40623-022-01705-3

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Oxygen isotopes of anhydrous primary minerals show kinship between asteroid Ryugu and comet 81P/Wild2 Reviewed International journal

Science Advances 8 ( 50 ) eade2067 2022.12 （ ISSN:2375-2548 ）

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DOI： 10.1126/sciadv.ade2067

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Trace-element analysis of mineral grains in Ryugu rock fragment sections by synchrotron-based confocal X-ray fluorescence Reviewed International journal

Bazi, Benjamin; Tack, Pieter; Lindner, Miles; Vekemans, Bart; De Pauw, Ella; Tkalcec, Beverley; Brenker, Frank E.; Garrevoet, Jan; Falkenberg, Gerald; Yabuta, Hikaru; Yurimoto, Hisayoshi; Nakamura, Tomoki; Amano, Kana; Matsumoto, Megumi; Fujioka, Yuri; Enokido, Yuma; Nakashima, Daisuke; Uesugi, Masayuki; Naraoka, Hiroshi; Noguchi, Takaaki; @Okazaki, Ryuji; Sakamoto, Kanako; Yada, Toru; Nishimura, Masahiro; Nakato, Aiko; Miyazaki, Akiko; Yogata, Kasumi; Abe, Masanao; Okada, Tatsuaki; Usui, Tomohiro; Yoshikawa, Makoto; Saiki, Takanao; Tanaka, Satoshi; Terui, Fuyuto; Nakazawa, Satoru; Tachibana, Shogo; Watanabe, Sei-ichiro; Tsuda, Yuichi; Vincze, Laszlo

Earth, Planets and Space 74 ( 1 ) 2022.12 （ ISSN:13438832 eISSN:1880-5981 ）

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DOI： 10.1186/s40623-022-01726-y

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Rock Magnetic Characterization of Returned Samples From Asteroid (162173) Ryugu: Implications for Paleomagnetic Interpretation and Paleointensity Estimation Reviewed International journal

Sato, Masahiko; Kimura, Yuki; Tanaka, Satoshi; Hatakeyama, Tadahiro; Sugita, Seiji; Nakamuna, Tomoki; Tachibana, Shogo; Yurimoto, Hisayoshi; Noguchi, Takaaki; @Okazaki, Ryuji; Yabuta, Hikaru; Naraoka, Hiroshi; Sakamoto, Kanako; Yada, Toru; Nishimura, Masahiro; Nakato, Aiko; Miyazaki, Akiko; Yogata, Kasumi; Abe, Masanao; Okada, Tatsuaki; Usui, Tomohiro; Yoshikawa, Makoto; Saiki, Takanao; Terui, Fuyuto; Nakazawa, Satoru; Watanabe, Sei-ichiro; Tsuda, Yuichi

Journal of Geophysical Research 127 ( 11 ) 2022.11 （ ISSN:2169-9097 eISSN:2169-9100 ）

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DOI： 10.1029/2022JE007405

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Ryugu's nucleosynthetic heritage from the outskirts of the Solar System Reviewed International journal

Science Advances 8 ( 46 ) eadd8141 2022.11 （ ISSN:2375-2548 ）

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DOI： 10.1126/sciadv.add8141

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The Solar System calcium isotopic composition inferred from Ryugu samples Invited Reviewed International journal

Geochemical Perspectives Letters 24 1 - 6 2022.10 （ ISSN:2410-339X eISSN:2410-3403 ）

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DOI： 10.7185/geochemlet.2238

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Presolar Stardust in Asteroid Ryugu

Barosch, J; Nittler, LR; Wang, JH; Alexander, CMO; De Gregorio, BT; Engrand, C; Kebukawa, Y; Nagashima, K; Stroud, RM; Yabuta, H; Abe, Y; Aléon, J; Amari, S; Amelin, Y; Bajo, KI; Bejach, L; Bizzarro, M; Bonal, L; Bouvier, A; Carlson, RW; Chaussidon, M; Choi, BG; Cody, GD; Dartois, E; Dauphas, N; Davis, AM; Dazzi, A; Deniset-Besseau, A; Di Rocco, T; Duprat, J; Fujiya, W; Fukai, R; Gautam, I; Haba, MK; Hashiguchi, M; Hibiya, Y; Hidaka, H; Homma, H; Hoppe, P; Huss, GR; Ichida, K; Iizuka, T; Ireland, TR; Ishikawa, A; Ito, M; Itoh, S; Kamide, K; Kawasaki, N; Kilcoyne, ALD; Kita, NT; Kitajima, K; Kleine, T; Komatani, S; Komatsu, M; Krot, AN; Liu, MC; Martins, Z; Masuda, Y; Mathurin, J; McKeegan, KD; Montagnac, G; Morita, M; Mostefaoui, S; Motomura, K; Moynier, F; Nakai, I; Nguyen, AN; Ohigashi, T; Okumura, T; Onose, M; Pack, A; Park, C; Piani, L; Qin, LP; Quirico, E; Remusat, L; Russell, SS; Sakamoto, N; Sandford, SA; Schönbächler, M; Shigenaka, M; Suga, H; Tafla, L; Takahashi, Y; Takeichi, Y; Tamenori, Y; Tang, HL; Terada, K; Terada, Y; Usui, T; Verdier-Paoletti, M; Wada, S; Wadhwa, M; Wakabayashi, D; Walker, RJ; Yamashita, K; Yamashita, S; Yin, QZ; Yokoyama, T; Yoneda, S; Young, ED; Yui, H; Zhang, AC; Abe, M; Miyazaki, A; Nakato, A; Nakazawa, S; Nishimura, M; Okada, T; Saiki, T; Tanaka, S; Terui, F; Tsuda, Y; Watanabe, SI; Yada, T; Yogata, K; Yoshikawa, M; Nakamura, T; Naraoka, H; Noguchi, T; Okazaki, R; Sakamoto, K; Tachibana, S; Yurimoto, H

ASTROPHYSICAL JOURNAL LETTERS 935 ( 1 ) 2022.8 （ ISSN:2041-8205 eISSN:2041-8213 ）

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We have conducted a NanoSIMS-based search for presolar material in samples recently returned from C-type asteroid Ryugu as part of JAXA's Hayabusa2 mission. We report the detection of all major presolar grain types with O- and C-anomalous isotopic compositions typically identified in carbonaceous chondrite meteorites: 1 silicate, 1 oxide, 1 O-anomalous supernova grain of ambiguous phase, 38 SiC, and 16 carbonaceous grains. At least two of the carbonaceous grains are presolar graphites, whereas several grains with moderate C isotopic anomalies are probably organics. The presolar silicate was located in a clast with a less altered lithology than the typical extensively aqueously altered Ryugu matrix. The matrix-normalized presolar grain abundances in Ryugu are 4.8 − 2.6 + 4.7 ppm for O-anomalous grains, 25 − 5 + 6 ppm for SiC grains, and 11 − 3 + 5 ppm for carbonaceous grains. Ryugu is isotopically and petrologically similar to carbonaceous Ivuna-type (CI) chondrites. To compare the in situ presolar grain abundances of Ryugu with CI chondrites, we also mapped Ivuna and Orgueil samples and found a total of 15 SiC grains and 6 carbonaceous grains. No O-anomalous grains were detected. The matrix-normalized presolar grain abundances in the CI chondrites are similar to those in Ryugu: 23 − 6 + 7 ppm SiC and 9.0 − 3.6 + 5.4 ppm carbonaceous grains. Thus, our results provide further evidence in support of the Ryugu-CI connection. They also reveal intriguing hints of small-scale heterogeneities in the Ryugu samples, such as locally distinct degrees of alteration that allowed the preservation of delicate presolar material.

DOI： 10.3847/2041-8213/ac83bd

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3D MORPHOLOGIES OF MAGNETITE, SULFIDES, CARBONATES AND PHOSPHATES IN RYUGU SAMPLES AND THEIR CRYSTALLIZATION SEQUENCE DURING AQUEOUS ALTERATION.

Tsuchiyama, A; Matsumoto, M; Matsuno, J; Nakamura, T; Noguchi, T; Yasutake, M; Uesugi, K; Takeuchi, A; Miyake, A; Okumura, S; Enju, S; Mitsukawa, I; Fujioka, Y; Sun, M; Takigawa, A; Enokido, Y; Kawamoto, T; Morita, T; Kikuiri, M; Amano, K; Kagawa, E; Matsumoto, T; Nakano, N; Rubino, S; Nakano, T; Yurimoto, H; Okazaki, R; Yabuta, H; Naraoka, H; Sakamoto, K; Tachibana, S; Watanabe, S; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 57 2022.8 （ ISSN:1086-9379 eISSN:1945-5100 ）

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VISIBLE-IR SPECTROSCOPIC DIVERSITY OF RYUGU COARSE GRAINS AND COMPARISON TO SPECTRAL PROPERTIES OF CARBONACEOUS CHONDRITES

Amano, K; Matsuoka, M; Nakamura, T; Kagawa, E; Fujioka, Y; Potin, SM; Hiroi, T; Tatsumi, E; Mil-Liken, RE; Brunetto, R; Beck, P; Takahashi, Y; Kawai, T; Yamashita, S; Uesugi, M; Morita, T; Kikuiri, M; Yurimoto, H; Noguchi, T; Okazaki, R; Yabuta, H; Naraoka, H; Sakamoto, K; Tachibana, S; Watanabe, S; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 57 2022.8 （ ISSN:1086-9379 eISSN:1945-5100 ）

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UPDATE ON MEASUREMENT OF THE COMPOSITION OF RYUGU FLUID INCLUSIONS

Zolensky, M; Dolocan, A; Bodnar, R; Gearba, I; Martinez, J; Han, J; Nakamura, T; Tsuchiyama, A; Matsuno, J; Sun, M; Matsumoto, M; Fujioka, Y; Enokido, Y; Uesugi, K; Takeuchi, A; Yasutake, M; Miyake, A; Okumura, S; Mitsukawa, I; Takigawa, A; Mikouchi, T; Enju, S; Morita, T; Kikuiri, M; Amano, K; Yurimoto, H; Noguchi, T; Okazaki, R; Yabuta, H; Naraoka, H; Sakamoto, K; Tachibana, S; Watanabe, S; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 57 2022.8 （ ISSN:1086-9379 eISSN:1945-5100 ）

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THE RARITY OF SPACE WEATHERED GRAINS FROM RYUGU: REGOLITH ABRASION?

Daly, L; Lee, MR; Smith, W; McFadzean, S; Martin, PE; Bagot, PAJ; Fougerouse, D; Saxey, DW; Reddy, S; Rickard, WDA; Noguchi, T; Yurimoto, H; Nakamura, T; Yabuta, H; Naraoka, H; Okazaki, R; Sakamoto, K; Tachibana, S; Watanabe, S; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 57 2022.8 （ ISSN:1086-9379 eISSN:1945-5100 ）

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SYNCHROTRON BASED TRACE ELEMENT ANALYSES OF A MAGNETITE VEIN CROSS CUTTING A MM-SIZED RYUGU ROCK FRAGMENT

Brenker, FE; Bazi, B; DePauw, E; Di Michiel, M; Falkenberg, G; Garrevoet, J; Lindner, M; Nakamura, T; Tack, P; Tkalcec, B; Vekemans, B; Uesugi, M; Matsumoto, M; Nakashima, D; Fujioka, Y; Morita, T; Kikuiri, M; Amano, K; Kagawa, E; Yurimoto, H; Noguchi, T; Okazaki, R; Yabuta, H; Naraoka, H; Sakamoto, K; Tachibana, S; Watanabe, S; Tsuda, Y; Vincze, L

METEORITICS & PLANETARY SCIENCE 57 2022.8 （ ISSN:1086-9379 eISSN:1945-5100 ）

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SPECTRAL ANALYSIS OF (162173) RYUGU RETURNED SAMPLE UNDER SIMULATED SPACE VACUUM CONDITIONS

Takir, D; Hibbitts, CH; Stockstill-Cahill, KR; Amano, K; Matsuoka, M; Nakamura, T; Yurimoto, H; Noguchi, T; Okazaki, R; Yabuta, H; Naraoka, H; Sakamoto, K; Tachibana, S; Watanabe, S; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 57 2022.8 （ ISSN:1086-9379 eISSN:1945-5100 ）

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SHOCK-INDUCED DEFORMATION RECORDED IN THE REGOLITH PARTICLES FROM C-TYPE ASTEROID RYUGU.

Kikuiri, M; Nakamura, T; Langenhorst, F; Pollok, K; Mikouchi, T; Yoshida, H; Nakashima, D; Zolensky, ME; Uesugi, M; Yurimoto, H; Noguchi, T; Okazaki, R; Yabuta, H; Naraoka, H; Sakamoto, K; Tachibana, S; Watanabe, S; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 57 2022.8 （ ISSN:1086-9379 eISSN:1945-5100 ）

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RYUGU PARTICLES FOUND OUTSIDE OF THE HAYABUSA2 SAMPLE CONTAINER

Inada, S; Nakato, A; Furuya, S; Nishimura, M; Yada, T; Abe, M; Usui, T; Yoshida, H; Mikouchi, T; Sakamoto, K; Okazaki, R; Sawada, H; Tachibana, S

METEORITICS & PLANETARY SCIENCE 57 2022.8 （ ISSN:1086-9379 eISSN:1945-5100 ）

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RARE EARTH ELEMENT ANALYSIS BY SXRF OF TWO RYUGU ROCK FRAGMENTS COLLECTED DURING THE HAYABUSA2 SPACE MISSION

Tkalcec, BJ; Tack, P; De Pauw, E; Lindner, M; Di Michiel, M; Bazi, B; Vekemans, B; Uesugi, M; Nakamura, T; Matsumoto, M; Fujioka, Y; Nakashima, D; Yurimoto, H; Noguchi, T; Okazaki, R; Yabuta, H; Naraoka, H; Sakamoto, K; Tachibana, S; Watanabe, S; Tsuda, Y; Vincze, L; Brenker, FE

METEORITICS & PLANETARY SCIENCE 57 2022.8 （ ISSN:1086-9379 eISSN:1945-5100 ）

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PRESOLAR OXIDE AND CARBONCEOUS GRAINS IN ASTEROID RYUGU AND IVUNA

Barosch, J; De Gregorio, B; Stroud, RM; Nittler, LR; Yurimoto, H; Yabuta, H; Nakamura, T; Noguchi, T; Okazaki, R; Naraoka, H; Sakamoto, K; Watanabe, Y; Tsuda, Y; Tachibana, S

METEORITICS & PLANETARY SCIENCE 57 2022.8 （ ISSN:1086-9379 eISSN:1945-5100 ）

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OLIVINE MINERALOGY OF ASTEROID RYUGU SAMPLES AND CI CHONDRITES: FURTHER EVIDENCE FOR THEIR COMMON ORIGIN.

Mikouchi, T; Yoshida, H; Nakamura, T; Zolensky, ME; Nakashima, D; Hagiya, K; Kikuiri, M; Morita, T; Amano, K; Kagawa, E; Yurimoto, H; Noguchi, T; Okazaki, R; Yabuta, H; Naraoka, H; Sakamoto, K; Tachibana, S; Watanabe, S; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 57 2022.8 （ ISSN:1086-9379 eISSN:1945-5100 ）

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NOBLE GAS ISOTOPIC ANALYZES OF THE ASTEROID RYUGU SAMPLES: INITIAL RESULTS OF THE MULTI-STEP PYROLYSIS.

Meshik, A; Pravdivtseva, O; Okazaki, R; Yurimoto, H; Nakamura, T; Noguchi, T; Naraoka, H; Yabuta, H; Sakamoto, K; Tachibana, S; Watanabe, S; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 57 2022.8 （ ISSN:1086-9379 eISSN:1945-5100 ）

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MODAL MINERALOGY OF ASTEROID 162173 RYUGU BY X-RAY DIFFRACTION.

King, AJ; Russell, SS; Nakamura, T; Yurimoto, H; Noguchi, T; Okazaki, R; Yabuta, H; Naraoka, H; Sakamoto, K; Tachibana, S; Watanabe, S; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 57 2022.8 （ ISSN:1086-9379 eISSN:1945-5100 ）

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MELT ZONES IN RYUGU SURFACE SAMPLES: XANES AND STEM-EELS CHARACTERISATION OF SPACE WEATHERING

Bridges, JC; Hicks, LJ; Noguchi, T; Matsumoto, T; Miyake, A; Yurimoto, H; Nakamura, T; Yabuta, H; Naraoka, H; Okazaki, R; Sakamoto, K; Tachibana, S; Watanabe, S; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 57 2022.8 （ ISSN:1086-9379 eISSN:1945-5100 ）

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INVESTIGATING THE NITROGEN-NOBLE GAS RELATIONSHIP OF ASTEROID RYUGU AND THE LINK TO OTHER CARBONACEOUS CHONDRITES

Broadley, MW; Byrne, DJ; Füri, E; Marty, B; Okazaki, R; Yurimoto, H; Nakamura, T; Noguchi, T; Naraoka, H; Yabuta, H; Sakamoto, K; Tachibana, S; Watanabe, S; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 57 2022.8 （ ISSN:1086-9379 eISSN:1945-5100 ）

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INITIAL NOBLE GAS RESULTS FROM RYUGU INSOLUBLE ORGANIC MATTER (IOM) AND OTHER SAMPLES.

Krietsch, D; Busemann, H; Riebe, MEI; Maden, C; Yabuta, H; Naraoka, H; Okazaki, R; Yurimoto, H; Nakamura, T; Noguchi, T; Sakamoto, K; Tachibana, S; Watanabe, S; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 57 2022.8 （ ISSN:1086-9379 eISSN:1945-5100 ）

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INITIAL ANALYSIS ACTIVITY OF HAYABUSA2-RETURNED SAMPLES FROM C-TYPE NEAR-EARTH ASTEROID (162173) RYUGU.

Tachibana, S; Yurimoto, H; Nakamura, T; Noguchi, T; Okazaki, R; Yabuta, H; Naraoka, H; Sakamoto, K; Watanabe, S; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 57 2022.8 （ ISSN:1086-9379 eISSN:1945-5100 ）

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HIGH RESOLUTION STEP PYROLYSIS XENON ISOTOPIC ANALYSIS OF RYUGU MATERIAL RETURNED BY HAYABUSA2.

Crowther, SA; Lawton, TP; Clay, PL; Fawcett, L; Cowpe, J; Gilmour, JD; Okazaki, R; Yurimoto, H; Nakamura, T; Noguchi, T; Naraoka, H; Yabuta, H; Sakamoto, K; Tachibana, S; Watanabe, S; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 57 2022.8 （ ISSN:1086-9379 eISSN:1945-5100 ）

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FUNCTIONAL GROUP COMPOSITIONS OF MACROMOLECULAR ORGANIC GRAINS IN (162173) RYUGU IN RELATION TO CARBONACEOUS CHONDRITES.

De Gregorio, BT; Cody, GD; Stroud, RM; Kilcoyne, ALD; Sandford, S; Nittler, LR; Barosch, J; Yabuta, H; Kebukawa, Y; Okumura, T; Hashiguchi, M; Yamashita, S; Takeichi, Y; Takahashi, Y; Yurimoto, H; Nakamura, T; Noguchi, T; Okazaki, R; Naraoka, H; Sakamoto, K; Tachibana, S; Watanabe, S; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 57 2022.8 （ ISSN:1086-9379 eISSN:1945-5100 ）

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COMPARISON OF MINERALOGICAL COMPOSITION OF ASTEROID RYUGU SAMPLES RETURNED BY THE HAYABUSA2 MISSION AND ANTARCTIC MICROMETEORITES (AMMs).

Bejach, L; Engrand, C; Duprat, J; Dartois, E; Mathurin, J; Dazzi, A; Deniset-Besseau, A; Rividi, N; Sandt, C; Borondics, F; Troadec, D; Nakamura, T; Morita, T; Kikuiri, M; Amano, K; Kagawa, E; Yabuta, H; Noguchi, T; Yurimoto, H; Okazaki, R; Naraoka, H; Sakamoto, K; Tachibana, S; Watanabe, S; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 57 2022.8 （ ISSN:1086-9379 eISSN:1945-5100 ）

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ANALYSIS OF "STONE" SAMPLES FROM C-TYPE ASTEROID RYUGU.

Nakamura, T; Matsumoto, M; Amano, K; Enokido, Y; Zolensky, M; Mikouchi, T; Genda, H; Tanaka, S; Zolotov, Y; Kurosawa, K; Wakita, S; Hyodo, R; Nagano, H; Nakashima, D; Takahashi, Y; Fujioka, Y; Kikuiri, M; Kagawa, E; Matsuoka, M; Brearley, AJ; Tsuchiyama, A; Uesugi, M; Matsuno, J; Kimura, Y; Sato, M; Milliken, RE; Tatsumi, E; Sugita, S; Hiroi, T; Kitazato, K; Brownlee, D; Joswiak, DJ; Takahashi, M; Ninomiya, K; Takahashi, T; Osawa, T; Terada, K; Brenker, FE; Tkalcec, BJ; Vincze, L; Brunetto, R; Aleon-Toppani, A; Chan, Q; Roskosz, M; Viennet, JC; Beck, P; Alp, E; Michikami, I; Nagaashi, Y; Tsuji, T; Ino, Y; Martinez, J; Han, J; Dolocan, A; Bodnar, RJ; Tanaka, M; Yoshida, H; Sugiyama, K; King, AJ; Fukushi, K; Suga, H; Yamashita, S; Kawai, T; Inoue, K; Nakato, A; Noguchi, T; Vilas, F; Hendrix, AR; Jaramillo, C; Domingue, DL; Dominguez, G; Gainsforth, Z; Engrand, C; Duprat, J; Russell, SS; Bonato, E; Ma, C; Kawamoto, T; Yurimoto, H; Okazaki, R; Naraoka, H; Sakamoto, K; Tachibana, S; Watanabe, S; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 57 2022.8 （ ISSN:1086-9379 eISSN:1945-5100 ）

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AN UPDATED OVERVIEW OF MACROMOLECULAR ORGANIC MATTER IN THE C-TYPE ASTEROID RYUGU SAMPLES.

Yabuta, H; Cody, GD; Engrand, C; Kebukawa, Y; De Gregorio, B; Bonal, L; Remusat, L; Stroud, R; Quirico, E; Nittler, LR; Hashiguchi, M; Komatsu, M; Dartois, E; Mathurin, J; Duprat, J; Okumura, T; Takahashi, Y; Takeichi, Y; Kilcoyne, D; Yamashita, S; Dazzi, A; Deniset-Besseau, A; Sandford, S; Mar-Tins, Z; Tamenori, Y; Ohigashi, T; Suga, H; Wakabayashi, D; Verdier-Paoletti, M; Mostefaoui, S; Monta-Gnac, G; Barosch, J; Kamide, K; Shigenaka, M; Bejach, L; Vitale, S; Aoki, D; Fukushima, K; Sugita, S; Yumoto, K; Sugimoto, N; Noguchi, T; Yurimoto, H; Nakamura, T; Okazaki, R; Naraoka, H; Sakamoto, K; Tachibana, S; Watanabe, S; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 57 2022.8 （ ISSN:1086-9379 eISSN:1945-5100 ）

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ACQUEOUS ALTERATION PROBED BY MUTLI-ASSEMBLY AND 3D HETEROGENEITY IN SMALL RYUGU FRAGMENTS

Dionnet, Z; Aléon-Toppani, A; Brunetto, R; Rubino, S; Nakamura, T; Baklouti, D; Djouadi, Z; Lantz, C; Mivumbi, O; Borondics, F; Héripré, E; Troadec, D; Tsuchiyama-, A; Matsuno, J; Matsumoto, M; Morita, T; Kikuiri, M; Amano, K; Kagawa, E; Yurimoto, H; Noguchi, T; Okazaki, R; Yabuta, H; Naraoka, H; Sa-Kamoto, K; Tachibana, S; Watanabe, S; Tsuda, Y

METEORITICS & PLANETARY SCIENCE 57 2022.8 （ ISSN:1086-9379 eISSN:1945-5100 ）

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Phoenix “Hayabusa”: A tale of the future (26) ‒ Curatorial works on returned Ryugu samples ‒

Yada T., Abe M., Okada T., Nakato A., Yogata K., Miyazaki A., Nishimura M., Sakamoto K., Hatakeda K., Kumagai K., Furuya S., Iwamae A., Yoshitake M., Hitomi Y., Soejima H., Nagashima K., Kanemaru R., Yamamoto D., Hayashi T., Fukai R., Sugawara H., Suzuki S., Tachibana S., Usui T., Yurimoto H., Fujimoto M., Sawada H., Okazaki R., Takano Y., Miura Y., Yano H., Ireland T., Sugita S., Cho Y., Yumoto K., Yabe Y., Mori S., Bibring J, Pilorget C., Brunetto R., Riu L., Loizeau D., Lourit L., Hamm V., Nakazawa S., Tanaka S., Saiki T., Yoshikawa M., Watanabe S., Tsuda Y.

Planetary People - The Japanese Society for Planetary Sciences 31 ( 2 ) 153 - 164 2022.6 （ ISSN:0918273X eISSN:2423897X ）

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DOI： 10.14909/yuseijin.31.2_153

CiNii Research
Preliminary analysis of the Hayabusa2 samples returned from C-type asteroid Ryugu

Yada, T; Abe, M; Okada, T; Nakato, A; Yogata, K; Miyazaki, A; Hatakeda, K; Kumagai, K; Nishimura, M; Hitomi, Y; Soejima, H; Yoshitake, M; Iwamae, A; Furuya, S; Uesugi, M; Karouji, Y; Usui, T; Hayashi, T; Yamamoto, D; Fukai, R; Sugita, S; Cho, Y; Yumoto, K; Yabe, Y; Bibring, JP; Pilorget, C; Hamm, V; Brunetto, R; Riu, L; Lourit, L; Loizeau, D; Lequertier, G; Moussi-Soffys, A; Tachibana, S; Sawada, H; Okazaki, R; Takano, Y; Sakamoto, K; Miura, YN; Yano, H; Ireland, TR; Yamada, T; Fujimoto, M; Kitazato, K; Namiki, N; Arakawa, M; Hirata, N; Yurimoto, H; Nakamura, T; Noguchi, T; Yabuta, H; Naraoka, H; Ito, M; Nakamura, E; Uesugi, K; Kobayashi, K; Michikami, T; Kikuchi, H; Hirata, N; Ishihara, Y; Matsumoto, K; Noda, H; Noguchi, R; Shimaki, Y; Shirai, K; Ogawa, K; Wada, K; Senshu, H; Yamamoto, Y; Morota, T; Honda, R; Honda, C; Yokota, Y; Matsuoka, M; Sakatani, N; Tatsumi, E; Miura, A; Yamada, M; Fujii, A; Hirose, C; Hosoda, S; Ikeda, H; Iwata, T; Kikuchi, S; Mimasu, Y; Mori, O; Ogawa, N; Ono, G; Shimada, T; Soldini, S; Takahashi, T; Takei, Y; Takeuchi, H; Tsukizaki, R; Yoshikawa, K; Terui, F; Nakazawa, S; Tanaka, S; Saiki, T; Yoshikawa, M; Watanabe, S; Tsuda, Y

NATURE ASTRONOMY 6 ( 2 ) 214 - + 2022.2 （ ISSN:2397-3366 ）

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C-type asteroids1 are considered to be primitive small Solar System bodies enriched in water and organics, providing clues to the origin and evolution of the Solar System and the building blocks of life. C-type asteroid 162173 Ryugu has been characterized by remote sensing2–7 and on-asteroid measurements8,9 with Hayabusa2 (ref. 10). However, the ground truth provided by laboratory analysis of returned samples is invaluable to determine the fine properties of asteroids and other planetary bodies. We report preliminary results of analyses on returned samples from Ryugu of the particle size distribution, density and porosity, spectral properties and textural properties, and the results of a search for Ca–Al-rich inclusions (CAIs) and chondrules. The bulk sample mainly consists of rugged and smooth particles of millimetre to submillimetre size, confirming that the physical and chemical properties were not altered during the return from the asteroid. The power index of its size distribution is shallower than that of the surface boulder observed on Ryugu11, indicating differences in the returned Ryugu samples. The average of the estimated bulk densities of Ryugu sample particles is 1,282 ± 231 kg m−3, which is lower than that of meteorites12, suggesting a high microporosity down to the millimetre scale, extending centimetre-scale estimates from thermal measurements5,9. The extremely dark optical to near-infrared reflectance and spectral profile with weak absorptions at 2.7 and 3.4 μm imply a carbonaceous composition with indigenous aqueous alteration, matching the global average of Ryugu3,4 and confirming that the sample is representative of the asteroid. Together with the absence of submillimetre CAIs and chondrules, these features indicate that Ryugu is most similar to CI chondrites but has lower albedo, higher porosity and more fragile characteristics.

DOI： 10.1038/s41550-021-01550-6

Web of Science

Scopus
Comparison of reduction power between serpentine and saponite based on oxidation analysis of Fe in Ryugu

Kawai Takahro, Enokido Yuma, Nakamura Tomoki, Yamashita Shohei, Fukushi Keisuke, Yabuta Hikaru, Yurimoto Hisayoshi, Noguchi Takaaki, Okazaki Ryuji, Naraoka Hiroshi, Tachibana Shogo, Sakamoto Kanako, Watanabe Sei―ichiro, Tsuda Yuichi, Takahashi Yoshio

Abstracts of Annual Meeting of the Geochemical Society of Japan 69 ( 0 ) 106 2022

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In mineral alteration processes in reducing hydrothermal environments such as the Central Ridge and subduction zones, much work has been done on the generation of hydrogen associated with the oxidation of divalent iron (Fe(II)) (e.g., McCollom and Bach, 2009), and the Fischer-Tropsch type reaction (carbon dioxide and hydrogen to produce aliphatic organic carbons such as methane) as a nonbiological organic matter formation process (e.g., Sforna et al., 2018). Similar arguments have been made for carbonaceous chondrites with similar mineral compositions, for example (e.g., Glein and Zolotov). As for the Fe(II)-associated reactions, the formation of magnetite from olivine has been considered important from the beginning, but it has been noted that oxidation reactions that Fe(II) undergoes at lower temperatures in the structure of layered silicates (serpentinite, saponite), once formed, contribute to the same extent (Andreani et al. 2013). On the other hand, the Fe(II)/Fetotal ratio in the structure of 2:1-type layered silicates (e.g., smectite) decreases with increasing Eh over a wide Eh range, but the changing Eh range has been shown to be mineral dependent (Gorski et al., 2013). Samples from the C-type asteroid Ryuguu brought back by Hayabusa2 indicate that Ryuguu experienced water alteration in the early solar system and that there was coevolution of minerals and organic matter associated with water alteration. Quantifying the Fe(II)/Fe(III) ratio in layered silicates from Ryuguu, which, unlike carbonaceous chondrites, are unaffected by terrestrial weathering, will provide important information for studying the reducing effects of layered silicates within the asteroid. In this study, the Fe(II)/Fe(III) ratios of layered silicates in Ryuguu were investigated by analyzing them with a scanning transmission X-ray microscope (STXM) without the influence of the oxidative Earth atmosphere.

DOI： 10.14862/geochemproc.69.0_106

CiNii Research
In-situ oxygen and manganese-chromium isotope studies of Ryugu: Implications to temperature and timing of aqueous activity

Nagashima Kazuhide, Kawasaki Noriyuki, Sakamoto Naoya, Nakamura Tomoki, Noguchi Takaaki, Okazaki Ryuji, Yabuta Hikaru, Naraoka Hiroshi, Sakamoto Kanako, Watanabe Sei―ichiro, Tsuda Yuichi, Tachibana Shogo, Yurimoto Hisayoshi

Abstracts of Annual Meeting of the Geochemical Society of Japan 69 ( 0 ) 107 2022

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DOI： 10.14862/geochemproc.69.0_107

CiNii Research
Spatial distribution of soluble organic compounds and its relationship with minerals in the asteroid Ryugu.

Hashiguchi Minako, Aoki Dan, Fukushima Kazuhiko, Naraoka Hiroshi, Yurimoto Hisayoshi, Nakamura Tomoki, Noguchi Takaaki, Okazaki Ryuji, Yabuta Hikaru, Sakamoto Kanako, Tachibana Shogo, Watanabe Sei―ichiro, Tsuda Yuichi

Abstracts of Annual Meeting of the Geochemical Society of Japan 69 ( 0 ) 104 2022

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DOI： 10.14862/geochemproc.69.0_104

CiNii Research
Organic matter in Ryugu vs. carbonaceous chondrites: IR spectroscopic perspectives

Kebukawa Yoko, Dartois Emmanuel, Quirico Eric, Bonal Lydie, Engrand Cecile, Duprat Jean, Mathurin Jeremie, Dazzi Alexandre, Deniset―Besseau Ariane, Yabuta Hikaru, Yurimoto Hisayoshi, Nakamura Tomoki, Noguchi Takaaki, Okazaki Ryuji, Naraoka Hiroshi, Sakamoto Kanako, Tachibana Shogo, Watanabe Sei―ichiro, Tsuda Yuichi

Abstracts of Annual Meeting of the Geochemical Society of Japan 69 ( 0 ) 103 2022

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As a part of the organic macromolecule subteam, infrared absorption spectra from the intact Ryugu particles and extracted insoluble organic matter (IOM) were obtained using Fourier transform infrared (FTIR) microspectroscopy, to understand the nature of organic matter in Ryugu. Both in the case of intact particles and extracted IOM, the IR absorption spectra of chamber A and chamber C were almost identical, but some local heterogeneity exists. The Ryugu IOM had the highest CH2/CH3 with the highest aliphatic CH/aromatic C=C ratios compared to unheated chondritic IOM. We also observed possible N-H features in the Ryugu IOM. Such characteristics of Ryugu organic matter might indicate freshness of the Ryugu particles, which is not preserved in carbonaceous chondrites.

DOI： 10.14862/geochemproc.69.0_103

CiNii Research
Ryugu particles found outside the Hayabusa2 sample container

Nakato Aiko, Inada Shiori, Furuya Shizuho, Nishimura Masahiro, Yada Toru, Abe Masanao, Usui Tomohiro, Yoshida Hideto, Mikouchi Takashi, Sakamoto Kanako, Yano Hajime, Miura Yayoi N., Takano Yoshinori, Yamanouchi Shinji, Okazaki Ryuji, Sawada Hirotaka, Tachibana Shogo

GEOCHEMICAL JOURNAL 56 ( 6 ) 197 - 222 2022 （ ISSN:00167002 eISSN:18805973 ）

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The Hayabusa2 spacecraft explored C-type near-Earth asteroid (162173) Ryugu and returned asteroidal materials, collected during two touchdown operations, to the Earth as the first sample from carbonaceous-type asteroid. The sample container, in which ~5 g of Ryugu sample was enclosed, was safely opened in the clean chamber system with no severe exposure to the terrestrial atmosphere. In the course of preparation operation of the sample container, two dark-colored millimeter- to sub-millimeter-sized particles were found outside the sealing part of the sample container. Because they look similar to the Ryugu particles inside the sample container, the particles were named as Q particles (Q from questionable). In this study, we investigated Q particles (Q001 and Q002) mineralogically and petrographically to compare them with potential contaminants (the ablator material of the reentry capsule and fine sand particles at the capsule landing site), Ryugu sample, and CI chondrites. The Q particles show close resemblance to Ryugu sample and CI chondrites, but have no evidence of terrestrial weathering that CI chondrites experienced. We therefore conclude that the Q particles are originated from Ryugu and were expelled from the sample catcher (sample storage canister) in space prior to the enclosure operation of the sample catcher in the sample container. The most likely scenario is that the Q particles escaped from the sample catcher during the retrieval of the sample collection reflector, which was the necessary operation for the sample container closing.

DOI： 10.2343/geochemj.gj22017

Web of Science

Scopus

CiNii Research
Experimental characterization of elastomeric O-rings as reusable seals for mass spectrometric measurements Application to in situ K–Ar dating on Mars

60 ( 7 ) 1453 - 1462 2017.10

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Mass spectrometry has been widely used in lander missions to characterize the volatiles in rocks and soils on planetary surfaces. A good vacuum seal is very important for introducing such solid samples to a vacuum chamber and ejecting them. However, multiple measurements require many metal gaskets, leading to extra weight and complexity for the instruments. In this study, we investigate the capability of three kinds of elastomeric O-rings (Viton, Nexus-SLT, and Nexus-FV) as vacuum seals for mass spectrometric measurements, particularly for in situ K–Ar dating on Mars. First, thermal cycle tests revealed that low-temperature-resistant O-rings can maintain pressure <10⁻⁵ Pa at −60 °C under 1 bar ambient pressure, whereas Viton O-rings leaked at −25 °C. Then, the amount of ⁴⁰Ar due to outgassing from the O-rings and permeation under the ambient pressure of 650 Pa or 3 Pa was measured and compared with the amounts of ⁴⁰Ar that a flight-equivalent laser would liberate from potential target Martian rocks. The measured amounts were <1% of that a target rock with 5000 ppm K₂O and an age of 4.2 Ga would yield. These results suggest that a Viton O-ring can maintain the Ar blank low under the Mars atmospheric pressure when temperatures are higher than −25 °C. A double O-ring seal using the low-temperature-resistant elastomers would be an alternative approach at lower temperatures. The elastomeric O-rings would be useful for constructing a small and light-weighted mass spectrometric instrument for in situ K–Ar dating on Mars.

DOI： 10.1016/j.asr.2017.07.002
Formation of an ultracarbonaceous Antarctic micrometeorite through minimal aqueous alteration in a small porous icy body Reviewed

Hikaru Yabuta, Takaaki Noguchi, Shoichi Itoh, Tomoki Nakamura, Akira Miyake, Shinichi Tsujimoto, Noriaki Ohashi, Naoya Sakamoto, Minako Hashiguchi, Ken ichi Abe, Aya Okubo, A. L.David Kilcoyne, Shogo Tachibana, Ryuji Okazaki, Kentaro Terada, Mitsuru Ebihara, Hiroko Nagahara

Geochmica et Cosmochimica Acta 214 172 - 190 2017.10

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DOI： 10.1016/j.gca.2017.06.047
Hayabusa2 Sample Catcher and Container Metal-Seal System for Vacuum Encapsulation of Returned Samples with Volatiles and Organic Compounds Recovered from C-Type Asteroid Ryugu Reviewed

Ryuji Okazaki, Hirotaka Sawada, Shinji Yamanouchi, Shogo Tachibana, Yayoi N. Miura, Kanako Sakamoto, Yoshinori Takano, Masanao Abe, Shoichi Itoh, Keita Yamada, Hikaru Yabuta, Chisato Okamoto, Hajime Yano, Takaaki Noguchi, Tomoki Nakamura, Keisuke Nagao,

Space Science Reviews 208 ( 1-4 ) 107 - 124 2017.7

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DOI： 10.1007/s11214-016-0289-5
Variation of mineralogy and organic material during the early stages of aqueous activity recorded in Antarctic micrometeorites Reviewed

Takaaki Noguchi, H. Yabuta, S. Itoh, N. Sakamoto, T. Mitsunari, A. Okubo, Ryuji Okazaki, T. Nakamura, S. Tachibana, K. Terada, M. Ebihara, N. Imae, M. Kimura, H. Nagahara

Geochmica et Cosmochimica Acta 208 119 - 144 2017.7

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DOI： 10.1016/j.gca.2017.03.034
Hayabusa2 Sampler Collection of Asteroidal Surface Material Reviewed

Hirotaka Sawada, Ryuji Okazaki, Shogo Tachibana, Kanako Sakamoto, Yoshinori Takano, Chisato Okamoto, Hajime Yano, Yayoi Miura, Masanao Abe, Sunao Hasegawa, Takaaki Noguchi,

Space Science Reviews 208 ( 1-4 ) 81 - 106 2017.7

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DOI： 10.1007/s11214-017-0338-8
Primordial and cosmogenic noble gases in the Sutter's Mill CM chondrite Reviewed

Ryuji Okazaki, Keisuke Nagao

Meteoritics and Planetary Science 52 ( 4 ) 669 - 689 2017.4

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DOI： 10.1111/maps.12819
Conceptual Design of an In Situ K-Ar Isochron Dating Instrument for Future Mars Rover Missions Reviewed International journal

Transaction of JSASS, Aerospace Technology Japan 2016.12

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An in-situ K-Ar isochron dating method for planetary landers using a spot-by-spot laser-ablation technique Reviewed

Yuichiro Cho, Seiji Sugita, Yayoi N. Miura, Ryuji Okazaki, Naoyoshi Iwata, Tomokatsu Morota, Shingo Kameda

Planetary and Space Science 128 14 - 29 2016.9

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DOI： 10.1016/j.pss.2016.05.004
Mineralogy and noble gas isotopes of micrometeorites collected from Antarctic snow Planetary Science Reviewed

Ryuji Okazaki, Takaaki Noguchi, Shin Ichi Tsujimoto, Yu Tobimatsu, Tomoki Nakamura, Mitsuru Ebihara, Shoichi Itoh, Hiroko Nagahara, Shogo Tachibana, Kentaro Terada, Hikaru Yabuta

Earth, Planets and Space 67 ( 1 ) 2015.12

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DOI： 10.1186/s40623-015-0261-8
惑星探査での年代測定に向けた開発の動向 Reviewed

長勇一郎, 三浦弥生, 亀田真吾, 岡崎隆司, 他

地球化学 48 231 - 243 2014.12

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Sylvite and halite on particles recovered from 25143 Itokawa: A preliminary report. Reviewed International journal

T. Noguchi, M. Kimura, T. Hashimoto, M. Konno, T. Nakamura, M. E. Zolensky,, A. Tsuchiyama, T. Matsumoto, J. Matsuno, Okazaki Ryuji, M. Uesugi, Y. Karouji, T. Yada, Y. Ishibashi, K. Shirai, M. Abe, T. Okada

Meteoritics & Planetary Science 49 1305 - 1314 2014.7

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Investigation of cutting methods for small samples of Hayabusa and future sample return missions. Reviewed International journal

Meteoritics & Planetary Science 49 ( 7 ) 2014.7

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Mineral chemistry of MUSES-C Regio inferred from analysis of dust particles collected from the first- and second-touchdown sites on asteroid Itokawa. Reviewed International journal

Meteoritics & Planetary Science 49 ( 2 ) 2014.2

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Hayabusa-returned sample curation in the Planetary Material Sample Curation Facility of JAXA. Reviewed International journal

Meteoritics & Planetary Science 49 ( 2 ) 2014.2

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Space weathered rims found on the surfaces of the Itokawa dust particles. Reviewed International journal

Meteoritics & Planetary Science 49 ( 2 ) 2014.2

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Effects of pressure and temperature on the silicon diffusivity 1 of pyrope-rich garnet Reviewed International journal

Akira Shimojuku, Tomoaki Kubo, Takumi Kato, Takashi Yoshino, Masayuki Nishi, Tomoki Nakamura, Ryuji Okazaki, Yuki Kakazu

Physics of the Earth and Planetary Interiors ( 226 ) 28 - 38 2014.1

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はやぶさ試料の希ガス同位体組成にもとづく太陽風照射の履歴解読

馬上謙一, 松田伸太郎, 岡崎隆司, 野口高明

日本惑星科学会誌 22 86 - 93 2013.6

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その場年代計測装置による月惑星年代学探査 Reviewed

長勇一郎, 諸田智克, 三浦弥生, 亀田真吾, 吉岡和夫, 岡崎隆司, 他

日本惑星科学会誌 21 267 - 275 2012.12

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Preliminary organic compound analysis of microparticles returned from Asteroid 25143 Itokawa by the Hayabusa mission. Reviewed International journal

H. Naraoka, H. Mita, K. Hamase, M. Mita, H. Yabuta, K. Saito, K. Fukushima , F. Kitajima, S. A. Sandford, T. Nakamura, T. Noguchi, R. Okazaki, K. Nagao, M. Ebihara, H. Yurimoto, A. Tsuchiyama, M. Abe, K. Shirai, M. Ueno, T. Yada, Y. Ishibashi, T. Okada, A. Fujimura, T. Mukai, M. Yoshikawa, J. Kawaguchi.

Geochemical Journal 46 2012.4

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Neutron activation analysis of a particle returned from asteroid Itokawa. Reviewed International journal

M. Ebihara, S. Sekimoto, N. Shirai, Y. Hamajima, M. Yamamoto, K. Kumagai, Y. Oura, T. R. Ireland, F. Kitajima, K. Nagao, T. Nakamura, H. Naraoka, T. Noguchi, R. Okazaki, A. Tsuchiyama, M. Uesugi, H. Yurimoto, M. E. Zolensky, M. Abe, A. Fujimura, T. Mukai, Y. Yada.

Science 333 2011.8

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Oxygen isotopic compositions of asteroidal materials returned from Itokawa by the Hayabusa mission.

H. Yurimoto, K. Abe, M. Abe, M. Ebihara, A. Fujimura, M. Hashiguchi, K. Hashizume, T. R. Ireland, S. Itoh, J. Katayama, C. Kato, J. Kawaguchi, N. Kawasaki, F. Kitajima, S. Kobayashi, T. Meike, T. Mukai, K. Nagao, T. Nakamura, H. Naraoka, T. Noguchi, R. Okazaki, C. Park, N. Sakamoto, Y. Seto, M. Takei, A. Tsuchiyama, M. Uesugi, S. Wakaki, T. Yada, K. Yamamoto, M. Yoshikawa, M. E. Zolensky.

Science 333 2011.8
Three-dimensional structure of Hayabusa samples: Origin and evolution of Itokawa regolith. Reviewed International journal

A. Tsuchiyama, M. Uesugi, T. Matsushima, T. Michikami, T. Kadono, T. Nakamura, K. Uesugi, T. Nakano, S. A. Sandford, R. Noguchi, T. Matsumoto, J. Matsuno, T. Nagano, Y. Imai, A. Takeuchi, Y. Suzuki, T. Ogami, J. Katagiri, M. Ebihara, T. R. Ireland, F. Kitajima, K. Nagao, H. Naraoka, T. Noguchi, R. Okazaki, H. Yurimoto, M. E. Zolensky, T. Mukai, M. Abe, T. Yada, A. Fujimura, M. Yoshikawa, J. Kawaguchi.

Science 333 2011.8

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Itokawa dust particles: A direct link between S-type asteroids and ordinary chondrites. Reviewed International journal

T. Nakamura, T. Noguchi, M. Tanaka, M. E. Zolensky, M. Kimura, A. Tsuchiyama, A. Nakato, T. Ogami, H. Ishida, M. Uesugi, T. Yada, K. Shirai, A. Fujimura, R. Okazaki, S. A. Sandford, Y. Ishibashi, M. Abe, T. Okada, M. Ueno, T. Mukai, M. Yoshikawa, J. Kawaguchi.

Science 333 2011.8

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Effects of hydrogen and iron on the silicon diffusivity of wadsleyite. International journal

Shimojuku A., Kubo T., Ohtani E., Nakamura T., Okazaki R.

Physics of the Earth and Planetary Interiors 183 2010.11

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Cosmic-ray exposure age and heliocentric distance of the parent bodies of enstatite chondrites ALH 85119 and MAC 88136. Reviewed International journal

D. Nakashima, T. Nakamura, R. Okazaki

Meteoritics & Planetary Science 2006.6

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Effects of experimental aqueous alteration on the abundances of argon-rich noble gases in the Ningqiang carbonaceous chondrite. Reviewed International journal

Y. Yamamoto, R. Okazaki, T. Nakamura

Meteoritics & Planetary Science 2006.4

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Thermal history of the enestatite chondrites from silica polymorphs. Reviewed International journal

M. Kimura, M. K. Weisberg, Y. Lin, A. Suzuki, E. Ohtani, Okazaki Ryuji

Meteoritics & Planetary Science 40 ( 6 ) 855 - 868 2005.6

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Construction of I-Xe and 40Ar-39Ar dating system using a modified VG3600 mass spectrometer and the first I-Xe data obtained in Japan. Reviewed

Ebisawa N., Sumino H., Okazaki R., Takigami Y., Hirano N., Nagao K., and Kaneoka I.

J. Mass Spectrom. Soc. Jpn. 2004.8

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Noble gases of Yamato 980459 shergottite. Reviewed International journal

Okazaki R. and Nagao K.

Anatarctic Meteorite Research 2004.3

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火星隕石の希ガス同位体 Invited

岡崎隆司、長尾敬介

月刊地球 2004.1

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Presentations

LL3-5コンドライト NWA 7985の宇宙線照射履歴

#飛松優、@岡崎隆司

日本地球化学会 2024.9

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Event date： 2024.9

Language：Japanese

Venue：東京海洋大学 Country：Japan
越谷、小牧、習志野、八王子、曽根隕石の希ガス同位体組成

@岡崎隆司、米田成一、山口亮

日本地球化学会 2023.9

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Event date： 2024.9

Language：Japanese

Venue：東京海洋大学 Country：Japan
40Ar/39Ar analyses on Martian meteorites, Yamato 002712, Asuka 12325 and Northwest Africa 12542 International conference

J. Park, @R. Okazaki, A. Yamaguchi, M. Inagaki, and A. J. Irving

55th Lunar and Planetary Science Conference 2024.3

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Event date： 2024.3

Language：English

Country：United States
Isotopic compositions of noble gases and nitrogen in the Ryugu samples returned by Hayabusa2 International conference

The 53rd Lunar and Planetary Science Conference 2022.3

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Event date： 2022.5

Language：English Presentation type：Oral presentation (general)

Country：United States
Initial Analysis of Volatile Components in the Hayabusa2 Samples Invited International conference

Hayabusa Symposium 2021 2021.11

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Event date： 2021.5 - 2022.5

Language：English Presentation type：Oral presentation (general)

Country：Japan
In-situ K-Ar dating of rock samples by a combination of laser-induced breakdown spectroscopy (LIBS) and noble-gas mass spectrometry International conference

@Ryuji Okazaki, @Moeka Harada, @Kasumi Yogata

82nd Annual Meetings of the Meteoritical Society 2019.7

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Event date： 2019.7

Language：English

Country：Japan
希ガス同位体に基づく惑星物質科学 Invited

岡崎隆司

日本地球化学会 2013.9

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Event date： 2013.9

Language：Japanese Presentation type：Oral presentation (general)

Country：Japan
sub-microgram地球外物質のための超高感度希ガス質量分析システム Invited

岡崎隆司

日本質量分析学会 2013.9

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Event date： 2013.9

Language：Japanese Presentation type：Oral presentation (general)

Venue：茨城 Country：Japan
Noble Gas Analysis of Two Hayabusa Samples as the First International A/O Investigation: A Progress Report International conference

Nagao, K., Okazaki Ryuji, Miura, Y., Osawa, T., Gilmour, J. D., Nishimura, Y.

The 44th Lunar and Planetary Science Conference 2013.3

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Event date： 2013.3

Language：English

Country：United States
Hayabusa-2 Sampler Team. The Sampling System of Hayabusa-2: Improvements from the Hayabusa Sampler International conference

Tachibana, S., Sawada, H., Okazaki Ryuji, Takano, Y., Okamoto, C., Yano, H., Hayabusa-2 Sampler Team.

The 44th Lunar and Planetary Science Conference 2013.3

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Event date： 2013.3

Language：English

Country：United States
Noble Gases Recovered from the Hayabusa Sample Container International conference

Okazaki R. * Nagao K. Miura Y. N. Osawa T. Bajo K. Matsuda S. Nakamura T. Shirai K. Abe M. Yada T. Noguchi T. Ishibashi Y. Fujimura A. Mukai T. Ueno M. Okada T. Yoshikawa M. Kawaguchi J.

The 42nd Lunar and Planetary Science Conference 2011.3

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Event date： 2011.4

Presentation type：Oral presentation (general)

Country：United States
Noble Gases of the Itokawa Samples Returned by the Hayabusa Mission International conference

Nagao K. * Okazaki R. Nakamura T. Miura Y. N. Osawa T. Bajo K. Matsuda S. Ebihara M. Ireland T. R. Kitajima F. Naraoka H. Noguchi T. Tsuchiyama A. Uesugi M. Yurimoto H. Zolensky M. Shirai K. Abe M. Yada T. Ishibashi Y. Fujimura A. Mukai T. Ueno M. Okada T. Yoshikawa M. Kawaguchi J.

The 42nd Lunar and Planetary Science Conference 2011.3

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Event date： 2011.4

Country：United States
エンスタタイトコンドライトの始原物質

岡崎隆司、中村智樹

日本地球化学会 2009.9

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Event date： 2009.9

Presentation type：Oral presentation (general)

Venue：広島大学 Country：Japan
Oxygen isotopes and REE abundances of lithic materials in the Begaa LL3 chondrite. International conference

R. Okazaki and T. Nakamura

The 29th Symposium on Antarctic Meteorites 2005.6

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Presentation type：Oral presentation (general)

Country：Japan
Noble-gas and oxygen isotopes and REE abundances in Antarctic micrometeorites. International conference

Okazaki R. and Nakamura T.

The 31st Symposium on Antarctic Meteorites 2007.6

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Country：Japan

Noble-gas and oxygen isotopes and REE abundances in Antarctic micrometeorites.
Mineralogy and isotope compositions of coarse-grained Antarctic micrometeorites. International conference

Okazaki R. Nakamura T.

71th Annual Meteoritical Society Meeting 2008.7

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Country：Japan

Mineralogy and isotope compositions of coarse-grained Antarctic micrometeorites.
Exposure Conditions of Samples Collected on Ryugu's Two Touchdown Sites Determined by Cosmogenic Nuclides 10Be and 26Al International conference

Nishiizumi, K.; Caffee, M. W.; Nagao, K.; Masarik, J.; @Okazaki, R.; Yurimoto, H.; Nakamura, T.; Noguchi, T.; Naraoka, H.; Yabuta, H.; Sakamoto, K.; Tachibana, S.; Watanabe, S.; Tsuda, Y.; Hayabusa2-Initial-Analysis Volatile Team

54th Lunar and Planetary Science Conference 2023.3

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Event date： 2023.3

Language：English

Country：United States
UV-Visible Reflectance Spectra of Grains Returned from 162173 Ryugu Unexposed to Earth's Atmosphere

Hendrix, Amanda R.; Vilas, Faith; JaramilloCorrea, Camilo; Pearson, Neil; Zolensky, Mike E.; Domingue, Deborah L.; Clark, Roger Nelson; Allain, Jean Paul; Nakamuna, Tomoki; Matsuoka, Moe; Amano, Kana; Morita, Tomoyo; Kikuiri, Mizuha; Naraoka, Hiroshi; Sakamoto, Kanako; Kagawa, Eiichi; Yurimoto, Hisayoshi; Noguchi, Takaaki; @Okazaki, Ryuji; Yabuta, Hikaru; Tachibana, Shogo; Watanabe, Seiichiro; Tsuda, Yuichi

AGU Fall Meeting 2022 2022.11

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Event date： 2022.12

Language：English

Country：United States
Rock-magnetic and paleointensity studies of returned samples from asteroid (162173) Ryugu

Sato, Masahiko; Kimura, Yuki; Tanaka, Satoshi; Hatakeyama, Tadahiro; Sugita, Seiji; Nakamuna, Tomoki; Tachibana, Shogo; Okuzumi, Satoshi; Watanabe, Seiichiro; Yurimoto, Hisayoshi; Noguchi, Takaaki; @Okazaki, Ryuji; Yabuta, Hikaru; Naraoka, Hiroshi; Sakamoto, Kanako; Yada, Toru; Nishimura, Masahiro; Nakato, Aiko; Miyazaki, Akiko; Yogata, Kasumi; Abe, Masanao; Okada, Tatsuaki; Usui, Tomohiro; Yoshikawa, Makoto; Saiki, Takanao; Terui, Fuyuto; Nakazawa, Satoru; Tsuda, Yuichi

AGU Fall Meeting 2022 2022.12

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Event date： 2022.12

Language：English

Country：United States
Initial Analysis Activity of Hayabusa2-Returned Samples from C-Type Near-Earth Asteroid (162173) Ryugu International conference

Tachibana, S.; Yurimoto, H.; Nakamura, T.; Noguchi, T.; @Okazaki, R.; Yabuta, H.; Naraoka, H.; Hayabusa2-Initial-Analysis Team

85th Annual Meeting of The Meteoritical Society 2022.8

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Event date： 2022.8

Language：English

Country：United Kingdom
Noble Gases of Eight Hayabusa2 Samples from the Asteroid Ryugu International conference

Nagao, K.; @Okazaki, R.; Nishiizumi, K.; Caffee, M. W.; Masarik, J.; Yurimoto, H.; Nakamura, T.; Noguchi, T.; Naraoka, H.; Yabuta, H.; Sakamoto, K.; Tachibana, S.; Watanabe, S.; Tsuda, Y.; Hayabusa2-Initial-Analysis Volatile Team

85th Annual Meeting of The Meteoritical Society 2022.8

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Event date： 2022.8

Language：English

Country：United Kingdom
Investigating the Nitrogen-Noble Gas Relationship of Asteroid Ryugu and the Link to Other Carbonaceous Chondrites International conference

85th Annual Meeting of The Meteoritical Society 2022.8

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Event date： 2022.8

Language：English

Country：United Kingdom
Noble Gas Isotopic Analyzes of the Asteroid Ryugu Samples: Initial Results of Multi-Step Pyrolysis International conference

Meshik, A.; Pravdivtseva, O.; @Okazaki, R.; Yurimoto, H.; Nakamura, T.; Noguchi, T.; Naraoka, H.; Yabuta, H.; Sakamoto, K.; Tachibana, S.; Watanabe, S.; Tsuda, Y.; Hayabusa2-Initial-Analysis Volatile Team

85th Annual Meeting of The Meteoritical Society 2022.8

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Event date： 2022.8

Language：English

Country：United Kingdom
超低ブランク希ガス質量分析装置を用いた微量希ガス同位体分析

@馬上謙一、# 岡崎隆司

第69回質量分析学総合討論会2021 2021.5

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Event date： 2021.5

Language：Japanese

Venue：オンライン Country：Japan
地球外物質のAr-Ar年代測定にむけて

@岩田尚能（山形大）、#岡崎隆司（九大）、@三浦弥生（東大）

惑星物質科学のフロンティア 2021.3

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Event date： 2021.3

Language：Japanese Presentation type：Oral presentation (general)

Venue：オンライン Country：Japan

微小量の地球外物質の年代測定にための開発を行った。
Trace elements analysis and Ar-Ar dating for microgram-scaled extraterrestrial samples International conference

2019.5

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Event date： 2019.5

Language：Japanese

Country：Japan
Willard (b) 角礫岩質HコンドライトおよびクラストのK-Ar年代、宇宙線照射年代

原田萌香、岡崎隆司

日本地球化学会年会 2018.9

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Event date： 2018.9

Language：Japanese

Venue：琉球大学 Country：Japan
レーザープラズマ発光分光と希ガス局所分析の融合による岩石試料局所年代測定

岡崎隆司、与賀田佳澄

日本地球化学会年会 2018.9

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Event date： 2018.9

Language：Japanese

Venue：琉球大学 Country：Japan

レーザーを用いた局所分析はICP-MSなど以外に希ガス分析でも利用されており、局所加熱で抽出される希ガス同位体を用いた特定の鉱物や包有物などの年代測定が可能となってきた。例えば、中性子照射した試料を用いて局所Ar-Ar年代測定が行われている。Ar-ArやI-Xe年代法のように親核種(KおよびI)を放射化により娘核種と同時に（同一の測定装置で）分析する場合以外は、親核種や標的元素の定量が必要である。しかし、レーザーアブレーションにより希ガスが抽出された領域そのものの元素分析は不可能であり、これまでは試料切片の表面観察・分析による情報で代用されてきた。本研究では、レーザーアブレーションの際に生じるプラズマ発光分光(Laser-Induced Breakdown Spectrometry, LIBS)による元素分析と希ガス同位体分析を組み合わせた分析システムの開発を行い、岩石試料の局所年代分析に適用した。
システムはNd:YAGパルスレーザー(1064 nm, pulse width ~8 nsec, beam diameter ~ 20 µm)、可視光分光器、希ガス質量分析計からなる。厚さ約100ミクロンのマダガスカル・Itlongay産orthoclaseおよび隕石試料に対して直径約20 µmの領域に0.1 uJのレーザーを10 Hzで1~2分間x10箇所（~0.5µg）に照射し、LIBS分析および希ガス質量分析を行った。希ガス抽出効率はorthoclaseのEPMAによるK濃度、K-Ar年代（435-461 Ma; Arnaud & Kelley, 1997; Wartho et al. 1999; Nägler &Villa, 2000）をもとに補正した。希ガス質量分析計の感度補正は既知量の地球大気により行った。LIBSのK感度はorthoclase (K2O=15.226 wt%)、albite (K2O=0.255 wt%)、wollastonite (K2O=0.466 wt%)のK (767 nm)と酸素(777.7nm)の輝線面積比をもとに線形近似により校正した。
これまでに普通コンドライト中のコンドリュールおよびマトリックスを分析し、K2O値が0.1wt%を超えるものについては約4.5GaのK-Ar年代を得ることができた。K濃度の低いものは輝線面積計算の不確かさが100%を超える。今後はLIBS検出器測定条件の見直し、バックグランド補正・関数フィッティングの精度向上により定量限界を改善していく。LIBSおよび希ガス質量分析計の検出限界を考慮すると、~100Maの年代を持つ地球岩石試料のhornblend, biotite, feldsparなどに対して、厚さ100µm、200x200 µmの領域での局所分析が可能である。これら複数鉱物年代を得ることができればアイソクロンK-Ar年代も可能になる。現在は更にK定量に加えて他の元素 (Mg, Si, Fe, Ca, Na)の定量を行い、隕石の宇宙線照射年代の精密測定（化学組成補正）を目指している。
はやぶさ２サンプラー開発とサンプル初期分析

岡崎隆司

京都大学原子炉実験所専門研究会　「京大炉(KUR)を用いた放射化分析の成果と今後の展望-2-」 2017.1

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Event date： 2017.1

Language：Japanese

Venue：京都大学原子炉実験所事務棟大会議室 Country：Japan
An In-situ Dating Instrument Package for a Future Mars Rover Mission

Yuichiro Cho, Shingo Kameda, Yayoi N. Miura, Yoshifumi Saito, Shoichiro Yokota, Satoshi Kasahara, Ryuji Okazaki, others

30th International Symposium on Space Technology and Science 2016.7

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Event date： 2016.7

Language：English

Country：Japan
イトカワ試料の形態的特徴と希ガス同位体組成との関係

岡崎隆司, T. Noguchi, 他

日本地球惑星科学連合2015年大会 2015.5

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Event date： 2016.5 - 2015.5

Language：Japanese Presentation type：Oral presentation (general)

Country：Japan
A laser-induced breakdown spectroscopy instrument for elemental analyses on Phobos

Yuichiro Cho, M. Horiuchi, K. Shibasaki, S. Kameda, K. Wada, T. Nakamura, T. Mikouchi, Y. Miura, Ryuji Okazaki, others

Phobos, Deimos, and Mars Workshop 2016.2

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Event date： 2016.2

Language：English

Country：Japan
惑星着陸探査におけるカリウム・アルゴン年代のその場計測: 月・火星でアルゴンを分析するための真空容器開発

長勇一郎, 三浦弥生, 岡崎隆司, 他

第63回質量分析討論会 2015.6

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Event date： 2015.6

Language：Japanese

Country：Japan
地球外物質希ガス測定のための新しい分析方法とシステム Invited

岡崎隆司

日本地球惑星科学連合2015年大会 2015.5

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Event date： 2015.5

Language：Japanese Presentation type：Oral presentation (general)

Country：Japan
月惑星探査における年代その場計測を目指した開発

長勇一郎, 芝崎和夫, 梅山未紗子, 大石峻裕, 亀田真吾, 三浦弥生, 吉岡和夫, 齋藤義文, 横田勝一郎, 笠原慧, 吉光徹雄, 岡崎隆司, 他

日本地球惑星科学連合2015年大会 2015.5

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Event date： 2015.5

Language：Japanese

Country：Japan
年代計測装置CHRONICLEによる火星表面年代のその場計測

長勇一郎, 亀田真吾, 三浦弥生, 齋藤義文, 横田勝一郎, 笠原慧, 岡崎隆司, 他

2015.1

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Event date： 2015.1

Language：Japanese

Country：Japan
宇宙塵のAr-Ar分析にむけて

岡崎隆司, 関本俊, 飛松優, 平山友紀子

2014年度同位体比部会 2014.11

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Event date： 2014.11

Language：Japanese Presentation type：Symposium, workshop panel (public)

Venue：茨城県つくば市 Country：Japan
マイクログラムサンプルのINAA＆Ar-Ar分析

岡崎隆司

京大炉(KUR)を用いた放射化分析の成果と今後の展望 2014.11

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Event date： 2014.11

Language：Japanese Presentation type：Symposium, workshop panel (public)

Venue：京都大学原子炉実験所 Country：Japan
火星探査で岩石のK-Ar年代を測る

長勇一郎, 三浦弥生, 亀田真吾, 岡崎隆司, 他

質量分析学会同位体比部会 2014.11

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Event date： 2014.11

Language：Japanese

Country：Japan
Mineral Ratios of Itokawa Samples — Difference Between Two Rooms of a Hayabusa Sample Catcher International conference

2013.3

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Event date： 2013.3

Language：English

Venue：Houston Country：United States
Coexisting Nitrogen-Rich and Poor Organic Materials in Ultracarbonaceous Antarctic Micrometeorite International conference

Yabuta, H., Itoh, S., Noguchi, T., Sakamoto, N., Hashiguchi, M., Abe, K., Tsujimoto, S., Kilcoyne, A. L. D., Okubo, A., Okazaki Ryuji, Tachibana, S., Terada, K., Nakamura, T., Nagahara, H.

The 75th Annual Meeting of the Meteoritical Society. 2012.8

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Event date： 2012.8

Language：English

Country：Australia
A Mineral Ratio of Itokawa Particles Recovered from the Hayabusa Sample Catcher International conference

Yada, T., Abe, M., Okada, T., Uesugi, M., Karouji, Y., Ishibashi, Y., Yakame, S., Shirai, K.,, Nakamura, T., Noguchi, T., Okazaki Ryuji, Fujimura, A.

The 75th Annual Meeting of the Meteoritical Society. 2012.8

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Event date： 2012.8

Language：English

Country：Australia
Asteroid Itokawa sample curation and distribution for initial analyses and international AO held in the planetary material sample curation facility of JAXA International conference

M. Abe, T. Yada, A. Fujimura, T. Okada, Y. Ishibashi1, K. Shirai, M. Uesugi, Y. Karouji, S. Yakame, T. Nakamura, T. Noguchi, R. Okazaki, T. Mukai, M. Fujimoto, M. Yoshikawa and J. Kawaguchi.

43rd Lunar and Planetary Science Conference 2011.3

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Event date： 2012.3

Country：United States
The shock state of Itokawa samples International conference

M. Zolensky, T. Nakamura, T. Mikouchi, K.Hagiya, K. Ohsumi, M. Tanaka, T. Noguchi, M. Kimura, A. Tsuchiyama, A. Nakato, T. Ogami, H. Ishida, M. Uesugi, T. Yada, K. Shirai, A. Fujimura, R. Okazaki, Y. Ishibashi, M. Abe, T. Okada, M. Ueno, T. Mukai, M. Yoshikawa, J. Kawaguchi

43rd Lunar and Planetary Science Conference 2011.3

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Event date： 2012.3

Country：United States
Space weathering products found on the surface of the Itokawa dust particles: A summary of the initial analysis International conference

T. Noguchi, M. Kimura, T. Hashimoto, M. Konno, T. Nakamura, A. Nakato, T. Ogami, H. Ishida, R. Sagae, S. Tsujimoto, A. Tsuchiyama, M. E. Zolensky, M. Tanaka, A. Fujimura, M. Abe, T. Yada, T. Mukai, M. Ueno, T. Okada, K. Shirai, Y. Ishibashi, and R. Okazaki.

43rd Lunar and Planetary Science Conference 2011.3

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Event date： 2012.3

Country：United States
Finding of nitrogen-rich organic material in Antarctic ultracarbonaceous micrometeorite International conference

H. Yabuta, S. Itoh, T. Noguchi, N. Sakamoto, M. Hashiguchi, K. Abe, S. Tsujimoto, A. L. D. Kilcoyne, A. Okubo, R. Okazaki, S Tachibana, K. Terada, T. Nakamura and H. Nagahara.

43rd Lunar and Planetary Science Conference 2011.3

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Event date： 2012.3

Country：United States
Evidence of Minimum Aqueous Alteration in Rock-Ice Body: Update of Organic Chemistry and Mineralogy of Ultracarbonaceous Antarctic Micrometeorite International conference

Yabuta, H, Noguchi, T., Itoh, S., Sakamoto, N., Hashiguchi, M., Abe, K., Tsujimoto, S., Kilcoyne, A. L. D., Okubo, A., Okazaki Ryuji, Tachibana, S.,, Nakamura, T.,, Terada, K, Ebihara, M.,, Nagahara, H

The 44th Lunar and Planetary Science Conference 2012.3

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Event date： 2012.3

Language：English

Country：United States
Chemical Composition of Dust Samples (Micrometeorites) Recovered from Antarctic Snow International conference

Ebihara, M.,, Sekimoto, S., Shirai, N., Tsujimoto, S., Noguchi, T., Nakamura, T.,, Okazaki Ryuji, Itoh, S., Tachibana, S.,, Yabuta, H, Terada, K, Nagahara, H

The 44th Lunar and Planetary Science Conference 2012.3

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Event date： 2012.3

Language：English

Country：United States
Noble Gas Study of the KOREAMET Antarctic Meteorite Collections, International conference

S. Matsuda, R. Okazaki, K. Nagao, J. I. Lee, M. J. Lee, and I. S. Ahn

The Isotope-ratio Mass Spectrometry Meeting 2011.11

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Event date： 2011.11

Country：Korea, Republic of
First direct evidence of asteroidal space weathering found on the surface of Itokawa particles International conference

T. Noguchi, T. Nakamura, M. Kimura, M.E. Zolensky, M. Tanaka, T. Hashimoto, M. Konno, A. Nakatou, T. Ogami, A. Fujimura, M. Abe, T. Yada, T. Mukai, M. Ueno, T. Okada, K. Shirai, Y. Ishibashi, R. Okazaki

74th Annual Meeting of the Meteoritical Society 2011.8

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Event date： 2011.8

Country：United Kingdom
Hayabusa sample curation at planetary material sample curation facility in JAXA International conference

T. Yada, A. Fujimura, M. Abe, T. Nakamura, T. Noguchi, R. Okazaki, T. Okada, Y. Ishibashi, K. Shirai, M.E. Zolensky, S. Sandford, M. Uesugi, K. Karouji, M. Ueno, T. Mukai, M. Yoshikawa, J. Kawaguchi

74th Annual Meeting of the Meteoritical Society 2011.8

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Event date： 2011.8

Country：United Kingdom
Mineralogy and thermal history of Itokawa surface particles recovered by Hayabusa mission International conference

T. Nakamura, T. Noguchi, M. Tanaka, M.E. Zolensky, M. Kimura, A. Tsuchiyama, A. Nakatou. T. Ogami, H. Ishida, M. Uesugi. T. Yada, K. Shirai, A. Fujimura, R. Okazaki, S. Sandford, S. Wakita, Y. Ishibashi, M. Abe, T. Okada, M. Ueno, T. Mukai, M. Yoshikawa, J. Kawaguchi

74th Annual Meeting of the Meteoritical Society 2011.8

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Event date： 2011.8

Country：United Kingdom
A preliminary micro-spectroscopic analysis of the carbonaceous matter in the particles recovered by the Hayabusa mission International conference

F. Kitajima, M. Kotsugi, T. Ohkochi, H. Naraoka, Y. Ishibashi, M. Abe, A. Fujimura, R. Okazaki, T. Yada, T. Nakamura, T. Noguchi, K. Nagao, A. Tsuchiyama, H. Yurimoto, M. Ebihara, T. Mukai. S.A. Sandford, T. Okada, K. Shirai, M. Ueno, M. Yoshikawa, J. Kawaguchi

74th Annual Meeting of the Meteoritical Society 2011.8

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Event date： 2011.8

Country：United Kingdom
Oxygen and magnesium isotopic compositions of Asteroid 25143 Itokawa returned by the Hayabusa mission International conference

H. Yurimoto, K. Abe, M. Abe, M. Ebihara, A. Fujimura, M. Hashiguchi, K. Hashizume, T.R. Ireland, S. Itoh, J. Katayama, C. Kato, J. Kawaguchi, N. Kawasaki, F. Kitajima S. Kobayashi, T. Meike. T. Mukai, K. Nagao, T. Nakamura, H. Naraoka. T. Noguchi, R. Okazaki, C. Park. N. Sakamoto, Y. Seto, M. Takei, A. Tsuchiya, M. Uesugi, S. Wakaki, T. Yada, K. Yamamoto, M. Yoshikawa, M.E. Zolensky

74th Annual Meeting of the Meteoritical Society 2011.8

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Event date： 2011.8

Country：United Kingdom
Origin and evolution of Itokawa regolith particles based on three dimensional shapes and sizes of Hayabusa samples International conference

A. Tsuchiyama, M. Uesugi, T. Matsushima, T. Michikami, T. Kadono, T. Nakamura, K. Uesugi, T. Nakano, S.A. Sandford, R. Noguchi, T. Matsumoto, J. Matsuno, T. Nagano, Y. Imai, A. Takeuchi, Y. Suzuki, T. Ogami, J. Katagiri, M. Ebihara, T.R. Ireland, F. Kitajima, K. Nagao, H. Naraoka. T. Noguchi, R. Okazaki, H. Yurimoto, M.E. Zolensky, T. Mukai, M. Abe, T. Yada, A. Fujimura, M. Yoshikawa, J. Kawaguchi

74th Annual Meeting of the Meteoritical Society 2011.8

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Event date： 2011.8

Country：United Kingdom
Solar noble gas in Itokawa regolith materials returned by the Hayabusa mission International conference

K. Nagao, R. Okazaki, T. Nakamura, Y.N. Miura, T. Osawa. K. Bajo, S. Matsuda, M. Ebihara, T.R. Ireland, F. Kitajima, H. Naraoka, T. Noguchi, A. Tsuchiyama, M. Uesugi, H. Yurimoto, M.E. Zolensky, K. Shirai, M. Abe, T. Yada, Y. Ishibashi, A. Fujimura, T. Mukai. M. Ueno, T. Okada, M. Yoshikawa, J. Kawaguchi

74th Annual Meeting of the Meteoritical Society 2011.8

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Event date： 2011.8

Country：United Kingdom
Examination of organic compounds in the Hayabusa samples from the asteroid Itokawa International conference

H. Naraoka, H. Mita, K. Hamase, M. Mita, H, Yabuta, K. Saito, K. Fukushima, F. Kitajima, S.A. Sandford, T. Nakamura, T. Noguchi, R. Okazaki, K. Nagao, M. Ebihara, H. Yurimoto, A. Tsuchiyama, M. Abe, K. Shirai, M. Ueno, T. Yada, Y. Ishibashi, T. Okada, A. Fujimura, T. Mukai, M. Yoshikawa, J. Kawaguchi

74th Annual Meeting of the Meteoritical Society 2011.8

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Event date： 2011.8

Country：United Kingdom
Mineralogy and Major Element Abundance of the Dust Particles Recovered from Muses-C Regio on the Asteroid Itokawa

Nakamura T. * Noguchi T. Tanaka M. Zolensky M. E. Kimura M. Nakato A. Ogami T. Ishida H. Tsuchiyama A. Yada T. Shirai K. Okazaki R. Fujimura A. Ishibashi Y. Abe M. Okada T. Ueno M. Mukai T.

The 42nd Lunar and Planetary Science Conference 2011.3

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Event date： 2011.4

Country：United States
はやぶさ回収サンプルのキュレーション作業（3）～ピックアップサンプルの観察

中村智樹(東北大･理),野口高明(茨城大･理),岡崎隆司(九州大･理),藤村彰夫(ISAS/JAXA),安部正真(ISAS/JAXA),矢田達(ISAS/JAXA),石橋之宏(JSPEC/JAXA),白井慶(JSPEC/JAXA),岡田達明(ISAS/JAXA),上野宗孝(ISAS/JAXA),向井利典(JAXA)

太陽系科学シンポジウム 2010.3

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Event date： 2011.4

Country：Japan
はやぶさサンプルのキュレーション運用計画

藤村彰夫,安部正真,矢田達,中村智樹,岡崎隆司,野口高明,石橋之宏,白井慶,小川真帆,田中智,小林直樹,岡田達明,加藤學,上野宗孝,向井利典

日本地球惑星科学連合2010年大会 2010.5

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Event date： 2011.4

Country：Japan
はやぶさサンプルの初期分析計画

土山明,海老原充,北島富美雄,長尾敬介,中村智樹,奈良岡浩,野口高明,岡崎隆司,上椙真之,圦本尚義

日本地球惑星科学連合2010年大会 2010.5

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Event date： 2011.4

Country：Japan
はやぶさサンプル初期分析でめざすもの

土`山明○ （阪大・理）,海老原充（首都大東京・理工）,北島冨美雄（九大・理）,長尾敬介（東大・理）,中村智樹（東北大・理）,奈良岡浩（九大・理）,野口高明（茨城大・理）,岡崎隆司（九大）,上椙真之（阪大・工）,圦本尚義（北大・理）,初期分析チーム

月惑星シンポジウム 2010.8

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Event date： 2011.4

Country：Japan
「はやぶさ」カプセルの受け入れとサンプルコンテナの開封

藤村彰夫○ （JAXA）,安部正真（JAXA）,矢田達（JAXA）,白井慶（JAXA）,石橋之宏（JAXA）,中村智樹（東北大）,岡崎隆司（九大）,野口高明（茨城大）,上野宗孝（JAXA）,向井利典（JAXA）

月惑星シンポジウム 2010.8

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Event date： 2011.4

Country：Japan
「はやぶさ」回収カプセル受入れとキュレーション作業

藤村彰夫*，安部正真(JAXA)，中村智樹(東北大)，野口高明(茨城大)，岡崎隆司(九州大)，矢田達，石橋之宏，白井慶，上野宗孝，向井利典(JAXA)

日本惑星科学会秋季大会 2010.10

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Event date： 2011.4

Country：Japan
はやぶさ回収サンプルのキュレーション作業（2）～コンテナ開封からサンプルピックアップ作業まで

藤村彰夫(ISAS/JAXA),安部正真(ISAS/JAXA),矢田達(ISAS/JAXA),中村智樹(東北大･理),野口高明(茨城大･理),岡崎隆司(九州大･理),石橋之宏(JSPEC/JAXA),白井慶(JSPEC/JAXA),石井信明(ISAS/JAXA),横田力男(ISAS/JAXA),岡田達明(ISAS/JAXA),上野宗孝(ISAS/JAXA),向井利典(JAXA)

太陽系科学シンポジウム 2010.12

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Event date： 2011.4

Country：Japan
はやぶさ回収サンプルのキュレーション作業（１）～カプセル回収からコンテナ洗浄まで

安部正真(ISAS/JAXA),藤村彰夫(ISAS/JAXA),矢田達(ISAS/JAXA),中村智樹(東北大･理),野口高明(茨城大･理),岡崎隆司(九州大･理),石橋之宏(JSPEC/JAXA),白井慶(JSPEC/JAXA),岡田達明(ISAS/JAXA),矢野創(ISAS/JAXA),岡本千里(JSPEC/JAXA),上野宗孝(ISAS/JAXA),向井利典(JAXA)

太陽系科学シンポジウム 2010.12

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Event date： 2011.4

Country：Japan
Recovery, Transpotation and Acceptance of the Curation Facility of the Hayabusa Re-Entry Capsule International conference

Abe M. Fujimura A. Yano H. Okamoto C. Okada T. Yada T. Ishibashi Y. Shirai K. Nakamura T. Noguchi T. Okazaki R. Zolensky M. E. Sandford S. A. Ireland T. Ueno M. Mukai T. Yoshikawa M. Yamada T. Kuninaka H. Kawaguchi J.

The 42nd Lunar and Planetary Science Conference 2011.3

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Event date： 2011.4

Country：United States
Preliminary Organic Compound Analysis of Particles Returned from Asteroid 25143 Itokawa by the Hayabusa Mission International conference

Naraoka H. * Mita H. Hamase K. Mita M. Yabuta H. Saito K. Fukushima K. Kitajima F. Sandford S. A. Nakamura T. Noguchi T. Okazaki R. Tsuchiyama A. Yada T. Shirai K. Fujimura A. Ishibashi Y. Abe M. Okada T. Ueno M. Mukai T.

The 42nd Lunar and Planetary Science Conference 2011.3

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Event date： 2011.4

Country：United States
A Micro-Spectroscopic Approach to the Carbonaceous Matter in the Particles Recovered by the Hayabusa Mission International conference

Kitajima F. * Kotsugi M. Ohkochi T. Naraoka H. Ishibashi Y. Abe M. Fujimura A. Okazaki R. Yada T. Nakamura T. Noguchi T. Nagao K. Tsuchiyama A. Mukai T. Sandford S. A. Okada T. Shirai K. Ueno M. Yoshikawa M. Kawaguchi J.

The 42nd Lunar and Planetary Science Conference 2011.3

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Event date： 2011.4

Country：United States
SEM and TEM Observation of the Surfaces of the Fine-Grained Particles Retrieved from the MUSES-C Region on the Asteroid 25413 Itokawa International conference

Noguchi T. * Nakamura T. Kimura M. Zolensky M. E. Tanaka M. Hashimoto T. Konno M. Nakato A. Ogami T. Fujimura A. Abe M. Yada T. Mukai T. Ueno M. Okada T. Shirai K. Ishibashi Y. Okazaki R.

The 42nd Lunar and Planetary Science Conference 2011.3

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Event date： 2011.4

Country：United States
Oxygen and Magnesium Isotopic Compositions of Asteroidal Materials Returned from Itokawa by the Hayabusa Mission International conference

Yurimoto H. * Abe M. Ebihara M. Fujimura A. Hashizume K. Ireland T. R. Itoh S. Kawaguchi J. Kitajima F. Mukai T. Nagao K. Nakamura T. Naraoka H. Noguchi T. Okazaki R. Sakamoto N. Seto Y. Tsuchiyama A. Uesugi M. Yada T. Yoshikawa M. Zolensky M.

The 42nd Lunar and Planetary Science Conference 2011.3

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Event date： 2011.4

Country：United States
Neutron Activation Analysis of Single Grains Recovered by the Hayabusa Spacecraft International conference

Ebihara M. * Sekimoto S. Hamajima Y. Yamamoto M. Kumagai K. Oura Y. Shirai N. Ireland T. R. Kitajima F. Nagao K. Nakamura T. Naraoka H. Noguchi T. Okazaki R. Tsuchiyama A. Uesugi M. Yurimoto H. Zorensky M. E. Abe M. Fujimura A. Mukai T. Yada T.

The 42nd Lunar and Planetary Science Conference 2011.3

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Event date： 2011.4

Country：United States
Three-Dimensional Structures of Particles Recovered from the Asteroid Itokawa by the Hayabusa Mission and a Role of X-Ray Microtomography in the Preliminary Examination International conference

Tsuchiyama A. * Uesugi M. Uesugi K. Nakano T. Nakamura T. Noguchi T. Noguchi R. Matsumoto T. Matsuno J. Nagano T. Takeuchi A. Suzuki Y. Ebihara M. Ireland T. R. Kitajima F. Nagao K. Naraoka H. Okazaki R. Sandford S. A. Yurimoto H. Zolensky M. E. Fujimura A. Abe M. Yada T. Mukai T. Kawaguchi J. Yoshikawa M.

The 42nd Lunar and Planetary Science Conference 2011.3

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Event date： 2011.4

Country：United States
Preliminary Examination of Particles Recovered from the Surface of the Asteroid 25143 Itokawa by the Hayabusa Mission International conference

Tsuchiyama A. * Ebihara M. Kimura M. Kitajima F. Kotsugi M. Ito S. Nagao K. Nakamura T. Naraoka H. Noguchi T. Okazaki R. Uesugi K. Uesugi M. Yurimoto H. Ireland T. R. Sandford S. A. Zolensky M. Fujimura A. Abe M. Yada T. Mukai T. Okada T. Ishibashi Y. Shirai K. Ueno M. Kawaguchi J. Yoshikawa M.

The 42nd Lunar and Planetary Science Conference 2011.3

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Event date： 2011.3

Presentation type：Oral presentation (general)

Country：United States
Processes to Open the Container and the Sample Catcher of the Hayabusa Returned Capsule in the Planetary Material Sample Curation Facility of JAXA International conference

Fujimura A. Abe M. Yada T. * Nakamura T. Noguchi T. Okazaki R. Ishibashi Y. Shirai K. Okada T. Yano H. Zokensky M. E. Sandford S. Ueno M. Mukai T. Yoshikawa M. Kawaguchi J.

The 42nd Lunar and Planetary Science Conference 2011.3

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Event date： 2011.3

Country：United States
Si and O diffusion in (Mg,Fe)2SiO4 wadsleyite and ringwoodite and its implications for rheology of the mantle transition zone. International conference

Shimojuku A., Kubo T., Ohtani E., Nakamura T., Okazaki R., Chakraborty S., Dohmen R.

American Geophysical Union 2008.12

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Event date： 2008.12

Country：United States
Nigqiang炭素質コンドライトの希ガス組成に基づいたプレソーラー粒子の存在度

山本征生、中村智樹、岡崎隆司、長尾敬介

日本惑星科学会 2008.11

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Event date： 2008.11

Venue：九州大学 Country：Japan
ウォズレアイトとリングウッダイト中の原子拡散とマントル遷移層のレオロジーへの適用

下宿彰、久保友明、大谷栄治、中村智樹、岡崎隆司、Sumit Chakraborty、Ralf Dohmen

日本鉱物科学会 2008.9

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Event date： 2008.9

Venue：秋田大学 Country：Japan
Noble gas analyses of small extraterrestrial samples

2008.9

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Event date： 2008.9

Country：Japan
ウォズレアイトとリングウッダイト中のSiとOの拡散, Si and O diffusion in wadsleyite and ringwoodite,

下宿彰，久保友明，大谷栄治，中村智樹，岡崎隆司，S. Chakraborty, R. Dohmen,

日本地球惑星科学連合２００８年大会 2008.5

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Event date： 2008.5

Venue：千葉 Country：Japan
無水条件下におけるMg2SiO4 ウォズレアイト中のシリコン拡散 Si diffusivity in Mg2SiO4 wadsleyite under nominally dry conditions

下宿彰，久保友明，大谷栄治，中村智樹，岡崎隆司

日本地球惑星科学連合２００８年大会 2008.5

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Event date： 2008.5

Venue：千葉 Country：Japan
Aqueous alteration effects on argon-rich noble gases in the Ningqiang carbonaceous chondrite: an experimental study. International conference

Y. Yamamoto, R. Okazaki, T. Nakamura

The 28th Symposium on Antarctic Meteorites 2004.6

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Presentation type：Oral presentation (general)

Country：Japan
Significant depletion of argon-rich noble gases in the Ningqiang carbonaceous chondrite during experimental aqueous alteration.

Y. Yamamoto, R. Okazaki, T. Nakamura

The 67th Annual Meeting of the Meteoritical Society 2004.8

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Presentation type：Oral presentation (general)

Country：Brazil
Lithic clasts in the Begaa LL3 chondrite.

2004.10

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Presentation type：Oral presentation (general)

Country：Japan
Noble gas study of new enstatite SaU 290 with high solar gases.

J. Park, R. Okazaki, K. Nagao and R. Bartoschewitz

36th Lunar and Planetary Science Conference 2005.3

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Presentation type：Symposium, workshop panel (public)

Country：United States
Origin and thermal history of lithic materials in the Begaa LL3 chondrite. International conference

R. Okazaki and T. Nakamura.

36th Lunar and Planetary Science Conference 2005.3

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Presentation type：Oral presentation (general)

Country：United States
Mineralogy and noble gas composition in experimentally altered Ningqiang carbonaceous chondrite

2005.5

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Presentation type：Oral presentation (general)

Country：Japan
Noble gas and oxygen isotopes of new CH chondrite, SaU 290 with abundant solar gases. International conference

J. Park, R. Okazaki, K. Nagao, R. Bartoschewitz, M. Kusakabe, M. Kimura

The 29th Symposium on Antarctic Meteorites 2005.6

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Presentation type：Oral presentation (general)

Country：Japan
Drastic chnages of mineralogy and noble gas compositions in carbonaceous chondrite Ningqiang during experimental aqueous alteration. International conference

Y. Yamamoto, R. Okazaki, T. Nakamura

The 29th Symposium on Antarctic Meteorites 2005.6

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Presentation type：Oral presentation (general)

Country：Japan
Sayh al Uhaymir 290 - A new CH3 Chondrite. International conference

R. Bartroschewitz, P. Appel, B. Mader, J. Park, K. Nagao, R. Okazaki, M Kusakabe

68th Annual Meteoritical Society Meeting 2005.9

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Presentation type：Oral presentation (general)

Country：United States
Ningqiang炭素質コンドライト中の鉱物、希ガス組成に与える実験的水質変質の影響

山本征生、中村智樹、野口高明、岡崎隆司

日本惑星科学会２００５年秋期講演会 2005.9

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Presentation type：Oral presentation (general)

Venue：福島 Country：Japan
Ningqiang炭素質コンドライト中の水質変質実験による鉱物、希ガス組成に与える影響

山本征生、中村智樹、野口高明、岡崎隆司

２００５年日本地球化学会第５２回年会 2005.9

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Presentation type：Oral presentation (general)

Venue：沖縄 Country：Japan
火星隕石中希ガスの起源：地球風化岩石の希ガス組成からの考察

朴芝鮮、長尾敬介、岡崎隆司

２００５年日本地球化学会第５２回年会 2005.9

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Presentation type：Oral presentation (general)

Venue：沖縄 Country：Japan
リングウッダイト中のシリコン拡散

下宿彰、大谷栄治、久保友明、中村智樹、岡崎隆司

２００５年鉱物学会 2005.9

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Presentation type：Oral presentation (general)

Venue：愛媛 Country：Japan
Temperature dependence of mineralogical and noble gas compositional changes during experimental aqueous alteration of Ningqiang. International conference

Y. Yamamoto, T. Nakamura, T. Noguchi, R. Okazaki, K. Nagao

37th Lunar and Planetary Science Conference 2006.3

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Presentation type：Oral presentation (general)

Country：United States
Thermal metamorphysm of CM carbonaceous chondrites: Effects on phyllosilicate mineralogy and presolar grain abundances. International conference

T. Nakamura, R. Okazaki, G. R. Huss

37th Lunar and Planetary Science Conference 2006.3

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Presentation type：Oral presentation (general)

Country：United States
Mineralogy and oxygen isotopes of unmelted Antarctic micrometeorites. International conference

R. Okazaki, T. Nakamura

37th Lunar and Planetary Science Conference 2006.3

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Presentation type：Oral presentation (general)

Country：United States
非溶融南極宇宙塵の酸素同位体

岡崎隆司、中村智樹

地球外起源固体微粒子に関する総合研究 2006.3

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Presentation type：Oral presentation (general)

Venue：茨城 Country：Japan
高圧下でのリングウッダイト中のシリコン拡散

下宿彰、大谷栄治、久保友明、中村智樹、岡崎隆司

日本地球惑星科学連合２００６年大会 2006.5

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Presentation type：Oral presentation (general)

Venue：千葉 Country：Japan
Primordial noble gases in enstatite chondrites: Implication for their parent bodies. International conference

R. Okazaki, N. Takaoka, T. Nakamura, K. Nagao

19th General Meeting of the International Mineralogical Association 2006.7

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Presentation type：Oral presentation (general)

Country：Japan
Mineralogical and noble-gas isotopic signatures of thermally metamorphosed hydrous carbonaceous chondrites. International conference

T. Nakamura, R. Okazaki, G. R. Huss

19th General Meeting of the International Mineralogical Association 2006.7

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Presentation type：Oral presentation (general)

Country：Japan
Silicon diffusivity in ringwoodite at the transition zone conditions. International conference

A. Shimojuku, T. Kubo, E. Ohtani, T. Nakamura, R. Okazaki

19th General Meeting of the International Mineralogical Association 2006.7

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Presentation type：Oral presentation (general)

Country：Japan
El-Quss Abu Said: A CM2 carbonaceous chondrite with decomposed phyllosilicates. International conference

T. Nakamura, T. Noguchi, R. Okazaki, K. Jogo, K. Ohtsuki

Desert Meteorite Workshop 2006.8

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Presentation type：Oral presentation (general)

Country：Morocco
Microchondrules within a troilite-rich rim around a chondrule in Yamato 790448 LL3 chondrite. International conference

R. Okazaki, T. Nakamura

69th Annual Meteoritical Soceity Meeting 2006.8

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Presentation type：Oral presentation (general)

Country：Switzerland
Geochemical study on Temagami iron-formations, Canada. International conference

Shimada Y., Yasumatsu A., Motomura Y., Okazaki R., Nakamura T., Ohmoto H., Okaue Y. and Yokoyama T.

16th Annual V.M. Goldschmidt conference 2006.8

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Country：Australia

Geochemical study on Temagami iron-formations, Canada.
リングウッダイト中のシリコンと酸素の拡散

下宿彰、大谷栄治、久保友明、中村智樹、岡崎隆司、S. Chakraborty、R. Dohmen

第４７回高圧討論会 2006.11

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Presentation type：Oral presentation (general)

Venue：熊本 Country：Japan
Chemical composition and formation process of silica-rich chondrule rims in the Sahara 00182 CR/CV chondrite. International conference

Kakazu Y., Nakamura T., Ohnishi I. and Okazaki R.

38th Lunar and Planetary Science Conference 2007.3

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Country：United States

Chemical composition and formation process of silica-rich chondrule rims in the Sahara 00182 CR/CV chondrite.
Si and O diffusivity in ringwoodite. International conference

Shimojuku A., Kubo T., Ohtani E., Nakamura T., Okazaki R., Chakraborty S. and Dohmen R.

High Pressure Mineral Physics Seminar (HPMPS-7) 2007.5

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Country：Japan

Si and O diffusivity in ringwoodite.
Mineralogical and stable isotope signatures of El-Quss Abu Said CM2 carbonaceous chondrite: pristine material from outer asteroid belt. International conference

T. Nakamura, T. Noguchi, R. Okazaki, K. Jogo, and K. Ohtsuka

71th Annual Meteoritical Society Meeting 2008.7

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Country：Japan

Mineralogical and stable isotope signatures of El-Quss Abu Said CM2 carbonaceous chondrite: pristine material from outer asteroid belt.
南極雪中から回収された宇宙塵の化学組成

岡崎隆司

日本地球惑星科学連合

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Language：Japanese

Country：Japan
微隕石研究のための新しい分析スキームの開発と特異な鉱物学的特徴を持つ微隕石の発見

岡崎隆司

日本地球惑星科学連合

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Language：Japanese

Country：Japan
南極雪から回収された宇宙塵の希ガス同位体

岡崎隆司, 飛松優

日本地球惑星科学連合

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Language：Japanese

Country：Japan
A fine-grained polycrustalline micrometeorite: An asteroidal dust particle with a unique mineralogy International conference

Ryuji Okazaki

The 76th Annual Meeting of the Meteoritical Society.

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Language：English

Country：Canada

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MISC

Author Correction: Contribution of Ryugu-like material to Earth’s volatile inventory by Cu and Zn isotopic analysis (Nature Astronomy, (2022), 7, 2, (182-189), 10.1038/s41550-022-01846-1)

Paquet M., Moynier F., Yokoyama T., Dai W., Hu Y., Abe Y., Aléon J., Conel C.M., Amari S., Amelin Y., Bajo K.i., Bizzarro M., Bouvier A., Carlson R.W., Chaussidon M., Choi B.G., Dauphas N., Davis A.M., Di Rocco T., Fujiya W., Fukai R., Gautam I., Haba M.K., Hibiya Y., Hidaka H., Homma H., Hoppe P., Huss G.R., Ichida K., Iizuka T., Ireland T.R., Ishikawa A., Ito M., Itoh S., Kawasaki N., Kita N.T., Kitajima K., Kleine T., Komatani S., Krot A.N., Liu M.C., Masuda Y., McKeegan K.D., Morita M., Motomura K., Nakai I., Nagashima K., Nesvorný D., Nguyen A.N., Nittler L., Onose M., Pack A., Park C., Piani L., Qin L., Russell S.S., Sakamoto N., Schönbächler M., Tafla L., Tang H., Terada K., Terada Y., Usui T., Wada S., Wadhwa M., Walker R.J., Yamashita K., Yin Q.Z., Yoneda S., Young E.D., Yui H., Zhang A.C., Nakamura T., Naraoka H., Noguchi T., Okazaki R., Sakamoto K., Yabuta H., Abe M., Miyazaki A., Nakato A., Nishimura M., Okada T., Yada T., Yogata K., Nakazawa S., Saiki T., Tanaka S., Terui F., Tsuda Y., Watanabe S.i., Yoshikawa M., Tachibana S., Yurimoto H.

Nature Astronomy 7 ( 5 ) 2023.5

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Publisher：Nature Astronomy

DOI： 10.1038/s41550-023-01938-6

Scopus
書評：微隕石探索図鑑：あなたの身近の美しい宇宙のかけら

岡崎隆司

遊星人 2018.9

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Language：Japanese Publishing type：Book review, literature introduction, etc.
火星隕石の希ガス同位体

岡崎隆司、長尾敬介

月刊地球、海洋出版株式会社 2004.1

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Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal)

Professional Memberships

The Geochemical Society of Japan
非公開
Meteoritics and Planetary Science

Committee Memberships

日本惑星科学会編集委員 Domestic

2005.6 - 2021.6

Academic Activities

Screening of academic papers

Role(s)： Peer review

2023

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Type：Peer review

Number of peer-reviewed articles in foreign language journals：2
Screening of academic papers

Role(s)： Peer review

2022

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Type：Peer review

Number of peer-reviewed articles in foreign language journals：0
Screening of academic papers

Role(s)： Peer review

2021

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Type：Peer review

Number of peer-reviewed articles in foreign language journals：1
Screening of academic papers

Role(s)： Peer review

2020

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Type：Peer review

Number of peer-reviewed articles in foreign language journals：1
Screening of academic papers

Role(s)： Peer review

2019

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Type：Peer review

Number of peer-reviewed articles in foreign language journals：3
Screening of academic papers

Role(s)： Peer review

2018

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Type：Peer review

Number of peer-reviewed articles in foreign language journals：1
Screening of academic papers

Role(s)： Peer review

2017

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Type：Peer review

Number of peer-reviewed articles in foreign language journals：2
座長（Chairmanship） International contribution

2007.6 - Present

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Type：Competition, symposium, etc.
遊星人、日本惑星科学会

2005.6 - Present

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Type：Academic society, research group, etc.

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Research Projects

火星衛星探査計画 MMX International coauthorship

2023.2

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Authorship：Collaborating Investigator(s) (not designated on Grant-in-Aid)
はやぶさ２帰還試料のガス採取および試料分析に関する研究開発

2020.4 - 2021.3

国立研究開発法人宇宙航空研究開発機構

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Authorship：Coinvestigator(s)

太陽系科学分野において研究を推進するため，はやぶさ２帰還試料におけるガス分析および微小固体試料分析に関する研究・開発を行う．
The Chemical Environment of the Solar System during its Formation

Grant number：2 0 H 0 5 8 4 6 2020 - 2024

Japan Society for the Promotion of Science・Ministry of Education, Culture, Sports, Science and Technology Grants-in-Aid for Scientific Research Grant-in-Aid for Transformative Research Areas (A)

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Authorship：Coinvestigator(s) Grant type：Scientific research funding

CiNii Research
木星の形成は原始太陽系星雲を分裂させたのか？ -分化隕石からのアプローチ-

Grant number：19H01959 2019.4 - 2023.3

科学研究費助成事業基盤研究(B)

山口亮, 白井直樹, 岡崎隆司, 飯塚毅

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Grant type：Scientific research funding

小惑星起源の隕石は、太陽系の原材料の生き残りとされるため、初期太陽系を理解するためには重要な試料である。本研究では、隕石の中でもエコンドライト（分化したケイ酸塩質隕石）に着目する。その加熱の度合い、原材料の元素組成、安定同位体、年代を網羅的に比較し、初期太陽系の組成構造やその進化過程の解明に迫る。

CiNii Research
木星の形成は原始太陽系星雲を分裂させたのか? -分化隕石からのアプローチ-

2019 - 2023

日本学術振興会科学研究費助成事業基盤研究(B)

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Authorship：Coinvestigator(s) Grant type：Scientific research funding
大気のない天体表面で何が起きているか：イトカワ試料詳細分析と宇宙風化研究の新展開

Grant number：24244088 2013

日本学術振興会科学研究費助成事業基盤研究(A)

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Authorship：Coinvestigator(s) Grant type：Scientific research funding
始原隕石中難揮発性包有物CAIの浮遊年代：太陽系星雲物質輸送・循環機構の解明

2011 - 2014

科学研究費助成事業若手研究(A)

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Authorship：Principal investigator Grant type：Scientific research funding
国立極地研究所研究プロジェクト（太陽系惑星物質の起源と進化過程の解明）

2010.7 - 2016.3

国立極地研究所

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Authorship：Coinvestigator(s)
初期太陽系における鉱物―水―有機物相互作用：惑星と生命の起源物質初期進化

2010 - 2014

日本学術振興会科学研究費助成事業基盤研究(S)

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Authorship：Coinvestigator(s) Grant type：Scientific research funding

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Class subject

基礎科学実習

2023.12 - 2024.2 Winter quarter
初期太陽系進化論

2023.10 - 2024.3 Second semester
地球惑星生物環境実験

2023.10 - 2024.3 Second semester
地球惑星化学実験

2023.10 - 2024.3 Second semester
地球惑星科学特別講義ⅩⅡ

2023.4 - 2023.9 First semester
地球惑星科学基礎実験

2023.4 - 2023.9 First semester
地球惑星実験学

2023.4 - 2023.9 First semester
宇宙科学概論

2023.4 - 2023.9 First semester
基礎科学実習

2022.12 - 2023.2 Winter quarter
地球惑星化学実験

2022.10 - 2023.3 Second semester
宇宙科学概論

2022.4 - 2022.9 First semester
地球惑星科学基礎実験

2022.4 - 2022.9 First semester
地球惑星実験学

2022.4 - 2022.9 First semester
基礎科学実習

2021.12 - 2022.2 Winter quarter
初期太陽系進化論

2021.10 - 2022.3 Second semester
地球惑星化学実験

2021.10 - 2022.3 Second semester
地球惑星実験学

2021.4 - 2021.9 First semester
地球惑星科学基礎実験

2021.4 - 2021.9 First semester
地球惑星実験学

2021.4 - 2021.9 First semester
初期太陽系進化論

2020.10 - 2021.3 Second semester
地球惑星化学実験

2020.10 - 2021.3 Second semester
地球惑星科学基礎実験

2020.4 - 2020.9 First semester
宇宙科学概論

2020.4 - 2020.9 First semester
地球惑星科学基礎実験

2020.4 - 2020.9 First semester
自然科学総合実験

2020.4 - 2020.6 Spring quarter
自然科学総合実験

2019.10 - 2020.3 Second semester
地球惑星化学実験

2019.10 - 2020.3 Second semester
国際科学特論Ⅴ

2019.10 - 2019.12 Fall quarter
地球惑星科学特別研究

2019.4 - 2020.3 Full year
地球惑星科学特別研究I

2019.4 - 2020.3 Full year
地球惑星科学基礎実験

2019.4 - 2019.9 First semester
物質科学演習

2019.4 - 2019.9 First semester
物質科学演習

2019.4 - 2019.9 First semester
地球惑星化学実験

2019.4 - 2019.9 First semester
地球惑星科学I

2019.4 - 2019.9 First semester
地球惑星化学実験

2018.10 - 2019.3 Second semester
地球惑星科学II

2018.10 - 2019.3 Second semester
自然科学総合実験

2018.10 - 2019.3 Second semester
地球惑星科学特別研究

2018.4 - 2019.3 Full year
地球惑星科学特別研究I

2018.4 - 2019.3 Full year
地球惑星科学基礎実験

2018.4 - 2018.9 First semester
地球惑星科学特別講義Ⅰ

2018.4 - 2018.9 First semester
物質科学演習

2018.4 - 2018.9 First semester
地球惑星化学実験

2018.4 - 2018.9 First semester
地球惑星化学実験

2015.10 - 2016.3 Second semester
自然科学総合実験

2015.10 - 2016.3 Second semester
地球惑星科学特別研究

2015.4 - 2016.3 Full year
地球惑星科学特別研究I

2015.4 - 2016.3 Full year
物質科学演習

2015.4 - 2015.9 First semester
地球惑星化学実験

2014.10 - 2015.3 Second semester
自然科学総合実験

2014.10 - 2015.3 Second semester
地球惑星科学特別研究

2014.4 - 2015.3 Full year
地球惑星科学特別研究I

2014.4 - 2015.3 Full year
物質科学演習

2014.4 - 2014.9 First semester
物質科学演習

2013.4 - 2013.9 First semester
物質科学演習

2012.4 - 2012.9 First semester
熱力学演習

2011.10 - 2012.3 Second semester
自然科学総合実験

2010.4 - 2010.9 First semester
地球惑星化学実験

2009.10 - 2010.3 Second semester
自然科学総合実験

2009.10 - 2010.3 Second semester
コアセミナー

2008.4 - 2008.9 First semester
Basic Laboratory Experiments in Natural Science Ⅱ

2024.12 - 2025.2 Winter quarter
地球惑星化学実験

2024.10 - 2025.3 Second semester
初期太陽系進化論

2024.10 - 2025.3 Second semester
物質科学演習

2024.6 - 2024.8 Summer quarter
地球惑星科学基礎実験

2024.4 - 2024.9 First semester
地球惑星実験学

2024.4 - 2024.9 First semester

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FD Participation

2022.3 Role：Participation Title：地球惑星科学科FD

Organizer：Undergraduate school department
2008.12 Role：Participation Title：必修実験について

Organizer：Undergraduate school department
2007.12 Role：Participation Title：新しい大学院教育について

Organizer：Undergraduate school department
2006.7 Role：Participation Title：地球惑星科学科FD　地球惑星科学科の新しいカリキュラムについて

Organizer：Undergraduate school department
2005.7 Role：Participation Title：地球惑星科学科　低年次専攻教育科目について考える

Organizer：Undergraduate school department
2004.7 Role：Participation Title：地球惑星科学科FD　企業人の視点から見た地球惑星科学科の教育

Organizer：Undergraduate school department

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Social Activities

第168回制御技術部会大会にて講演（タイトル「小惑星探査機はやぶさ2の試料回収・封入装置の開発と帰還試料初期分析」）

日本鉄鋼協会 2023.7

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Audience： General,　Scientific,　Company,　Civic organization,　Governmental agency

Type：Lecture
はやぶさ２試料分析に関して

はまぎんこども宇宙科学館 2022.5

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Audience： General,　Scientific,　Company,　Civic organization,　Governmental agency

Type：Lecture
「九州で解明するリュウグウの秘密！」～「はやぶさ２」トークライブ　シーズン２～

福岡市科学館　 2020.7

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Audience： General,　Scientific,　Company,　Civic organization,　Governmental agency

Type：Lecture

はやぶさ初号機の回収試料分析をきっかけに、はやぶさシリーズとは約20年のお付き合い。現在、はやぶさ２サンプル初期分析チームのサブチームリーダーの一人であり、帰還カプセル回収チームメンバーでもある。希ガス分析が専門。
福岡市立西陵小学校の学童保育施設にて、探査機はやぶさ２に関する講演と体験授業（かんたんな実験）を行った。

福岡市立西陵小学校、学童保育施設福岡市立西陵小学校、学童保育施設 2019.8

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Audience： General,　Scientific,　Company,　Civic organization,　Governmental agency

Type：Other
リカレント教育として、高校教員の方々を対象として、研究活動などに関する講演を行った。

九州大学九州大学伊都キャンパス 2019.8

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Audience： General,　Scientific,　Company,　Civic organization,　Governmental agency

Type：Seminar, workshop
社会連携活動として、高校生（唐津東高校）を対象とした研究活動紹介などに関する講演を行った。

九州大学、唐津東高校九州大学、伊都キャンパス 2019.7

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Audience： General,　Scientific,　Company,　Civic organization,　Governmental agency

Type：Other
はやぶさ２探査機の開発とリターンサンプルの科学について

科学を語る会 2015.9

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Audience： General,　Scientific,　Company,　Civic organization,　Governmental agency

Type：Lecture
はやぶさ粒子分析に関する講演

長崎県立長崎南高等学校 2012.7

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Audience： General,　Scientific,　Company,　Civic organization,　Governmental agency

Type：Seminar, workshop
はやぶさ粒子分析とその科学的成果について

まほろば・けいはんなサイエンス交流フォーラム 2011.10

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Audience： General,　Scientific,　Company,　Civic organization,　Governmental agency

Type：Lecture

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Media Coverage

はやぶさ２試料分析に関して TV or radio program

2022.10

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はやぶさ２試料分析に関して
はやぶさ２探査機について Newspaper, magazine

毎日新聞 2020.12

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はやぶさ２探査機について
一般向け科学解説記事 Newspaper, magazine

読売新聞 2019.4

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一般向け科学解説記事
はやぶさ２探査機のサンプル回収装置開発について TV or radio program

福岡放送 2014.12

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はやぶさ２探査機のサンプル回収装置開発について
はやぶさ２探査機のサンプル回収装置開発について TV or radio program

NHK、コズミックフロント 2014.12

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はやぶさ２探査機のサンプル回収装置開発について
はやぶさ２探査機のサンプル回収装置開発について TV or radio program

九州朝日放送 2014.11

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はやぶさ２探査機のサンプル回収装置開発について
はやぶさ２探査機のサンプル回収装置開発について TV or radio program

テレビ西日本 2014.11

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はやぶさ２探査機のサンプル回収装置開発について
はやぶさ２探査機のサンプル回収装置開発について Newspaper, magazine

読売新聞 2014.11

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はやぶさ２探査機のサンプル回収装置開発について
はやぶさ２探査機のサンプル回収装置開発について Newspaper, magazine

西日本新聞 2014.10

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はやぶさ２探査機のサンプル回収装置開発について
はやぶさ探査機リターンサンプルの回収作業について Newspaper, magazine

西日本新聞 2010.7

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はやぶさ探査機リターンサンプルの回収作業について

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