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Ryuji Okazaki Last modified date:2016.09.09

Assistant Professor / Material Science of Solar Planets
Department of Earth and Planetary Sciences
Faculty of Sciences

Graduate School
Undergraduate School

Department of Earth and Planetary Sciences
Faculty of Sciences
Kyushu University .
Academic Degree
Doctor of Science
Field of Specialization
Planetary Material Science
Outline Activities
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.
Research Interests
  • Space weathering on the surface of asteroids
    keyword : space weathering, noble gas, Hayabusa, asteroid, regolith
  • Development of Hayabusa-2
    keyword : Hayabusa-2
  • Noble gas analysis for an asteroid sample from Itokawa
    keyword : Hayabusa, Itokawa, asteroid, noble gas, solar system
  • Pre-compaction ages for Ca-Al-rich refractory inclusions (CAIs) in chondrites
    keyword : CAIs, pre-compaction age, solar nebula
  • Interaction between minerals, water, and organic materials in the early solar system.
    keyword : minerals, water, organic materials, the early solar system.
  • 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
    2007.04Chondrites are primitive meteorites and classified into several groups based on their mineralogy and chemistry. In order to deduce the origin of the diversity of chondrites, fine-grained matrix consisiting of the most primitive material aggregates have been investigated..
  • Chemistry, mineralogy, and isotopic characteristics of crystalline Antarctic micrometeorites.
    keyword : micrometeorites, comet, asteroids, meteorites, crystalline, noble gas, oxygen, rare earth elements
    2006.04~2008.05Micrometeorites are the major part of dust particles falling on the Earth. Coarse-grained micrometeorites consist of crystalline olivine, pyroxene, metal and suldfides. Their origin could be asteroidal and cometary. In order to understand the origin and evolution history of primitive materials in the solar system, mineralogy, chemistry, and isotope compositions of coarse-grained micrometeorites have been investigated..
  • Origin and history of the reduced material in the solar nebula
    keyword : solar nebula, reduced material, enstatite chondrites, noble gas, oxygen, rare earth elements
    2001.04~2006.12The origin and evolution history of the reduced materials in the solar system is not well understood. Investigated are highly reduced meteorites, enstatite chondrites, in respects of petrology, mineralogy, noble gas isotopes, oyxgen isotopes, and rare earth element abundances..
Academic Activities
1. Okazaki Ryuji, Sawada Hirotaka, et al., 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, Space Science Reviews, in press, 2016.12.
2. Okazaki Ryuji, Takaaki Noguchi, 他, Mineralogy and noble gas isotopes of micrometeorites collected from Antarctic snow, EARTH PLANETS AND SPACE, 67, 2015.06.
3. 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, Space weathered rims found on the surfaces of the Itokawa dust particles., Meteoritics & Planetary Science, 49, 2, 2013.05.
4. 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, Hayabusa-returned sample curation in the Planetary Material Sample Curation Facility of JAXA., Meteoritics & Planetary Science, 49, 2, 2014.02.
5. Jenniskens P., 他, Okazaki Ryuji, 他, Radar-Enabled Recovery of the Sutter's Mill Meteorite, a Carbonaceous Chondrite Regolith Breccia, Science, 338, 6114, 1583-1587, 2012.12.
6. K. Bajo, H. Sumino, M. Toyoda, Okazaki Ryuji, T. Osawa, M. Ishihara, I. Katakuse, K. Notsu, G. Igarashi, K. Nagao, Construction of a newly designed small-size mass spectrometer for helium isotope analysis: Toward the continuous monitoring of 3He/4He ratios in natural fluids., Mass Spectrometry, DOI:10.5702, 2012.11.
7. 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., Incipient space weathering observed on the surface of Itokawa dust particles., Science, 333, 1121-1125, 2011.08.
8. 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., Irradiation history of Itokawa regolith material deduced from noble gases in the Hayabusa samples., Science, 333, 1128-1131, 2011.08.
9. Ryuji Okazaki, Nobuo Takaoka, Keisuke Nagao, Tomoki Nakamura, Noble gases in enstatite chondrites released by stepped crushing and heating, Meteoritics & Planetary Science, 45, 3, 339-360, 2010.03.
10. Okazaki Ryuji, K. Nagao, N. Imae, H. Kojima, Noble gas signatures of Antarctic nakhlites, Yamato (Y) 000593, Y000749, and Y000802, Antarctic Meteorite Research, 16, 2003.03.
11. Okazaki Ryuji, Tomoki Nakamura, N. Takaoka, K. Nagao, Noble gases in ureilites released by crushing, Meteoritics and Planetary Sciences, 38, 5, 2003.05.
12. Okazaki Ryuji, N. Takaoka, K. Nagao, Minoru Sekiya, Tomoki Nakamura, Noble-gas-rich chondrules in an enstatite meteorite, Nature, 412, 6849, 2001.08.
13. Okazaki Ryuji, N. Takaoka, T. Nakamura, K. Nagao, Cosmic-ray exposure ages of enstatite chondrites, Antarctic Meteorite Research, 13, 1999.03.
1. Nagao, K., Okazaki Ryuji, Miura, Y., Osawa, T., Gilmour, J. D., Nishimura, Y., Noble Gas Analysis of Two Hayabusa Samples as the First International A/O Investigation: A Progress Report , The 44th Lunar and Planetary Science Conference, 2013.03.
2. Tachibana, S., Sawada, H., Okazaki Ryuji, Takano, Y., Okamoto, C., Yano, H., Hayabusa-2 Sampler Team., Hayabusa-2 Sampler Team. The Sampling System of Hayabusa-2: Improvements from the Hayabusa Sampler, The 44th Lunar and Planetary Science Conference, 2013.03.
3. Mineralogy and isotope compositions of coarse-grained Antarctic micrometeorites. .
4. Noble-gas and oxygen isotopes and REE abundances in Antarctic micrometeorites. .
Membership in Academic Society
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