Updated on 2025/01/23

Information

 

写真a

 
ONOUE TETSUJI
 
Organization
Faculty of Science Department of Earth and Planetary Sciences Professor
International Center for Space and Planetary Environmental Science (Concurrent)
School of Sciences Department of Earth and Planetary Sciences(Concurrent)
Graduate School of Sciences Department of Earth and Planetary Sciences(Concurrent)
Title
Professor
Contact information
メールアドレス
Tel
0928024246
Profile
【研究活動】 顕生代には,何度かの大量絶滅を引き起こした海洋環境変動が報告されており,大規模な火成活動,隕石衝突,大気・海洋表層における酸素濃度の急激な低下などが原因と考えられている.これらはイジェクタ層や黒色頁岩層といった特徴的な堆積岩として記録されており,詳しく調べることで大量絶滅へとつながる具体的な環境変動のメカニズムを知ることができる.研究室では,放散虫やコノドントといった微化石と,堆積学・地球化学的な手法を利用して,堆積岩に記録された環境変動と大量絶滅との関連性を解明する研究を積極的に進めている. 【教育活動】 層序学を習得した学生の育成につとめており,層序・岩相の記載や化石年代の決定といった基本的な地質調査法の指導にこれまで取り組んできた.大学院生には,学会発表を積極的に行わせ,論文公表を最終目標とした教育を心がけている.また国際的に活躍する学生の育成を期待して,海外でのフィールドワークや国際学会で発表する機会も積極的に与えている.
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Research Areas

  • Natural Science / Biogeosciences

Degree

  • Ph.D. (Science)

Research History

  • Kyushu University Professor

    2019 - Present

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  • 鹿児島大学理学部 助手(平成17年4月〜19年3月) 鹿児島大学大学院理工学研究科 助教(平成21年4月〜25年3月) 熊本大学大学院自然科学研究科 准教授(平成25年4月〜28年3月) 熊本大学大学院先端科学研究部 准教授(平成28年4月〜31年3月)

Research Interests・Research Keywords

  • Research theme:Mass extinction

    Keyword:Mass extinction

    Research period: 2017.4 - 2023.4

  • Research theme:Micropaleontology

    Keyword:Permian, Triassic, conodont, radiolaria

    Research period: 2015.4 - 2023.4

  • Research theme:Changes in ancient marine environments

    Keyword:Permian, Triassic, Panthalassa, Tethys

    Research period: 2015.4 - 2023.4

  • Research theme:Large impact event in geological age

    Keyword:Meteorite, Impact, extinction

    Research period: 2012.4 - 2023.4

Awards

  • 第83回西日本文化賞 奨励賞 学術文化部門

    2024.11   公益財団法人西日本新聞文化財団   地質時代における宇宙物質流入の分析技術を開発し、地球生命史研究の新たな領域を開拓した功績

    尾上哲治

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    Award type:Award from publisher, newspaper, foundation, etc.  Country:Japan

  • 令和5年度科学技術分野の文部科学大臣表彰科学技術賞(研究部門)

    2023.4   文部科学省   地質時代を通した宇宙物質流入と地球生命史に関する研究

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    本研究は、日本の深海底堆積岩を対象として、地質時代における宇宙物質流入量の時間変化を復元するための年代決定手法と化学分析技術を開発したものである。本研究により、過去 3 億年間の深海底堆積岩から、これまで未報告の小惑星衝突イベントと宇宙塵の大量流入イベントを発見した。これらのイベントが発生した時代には、突発的な化石の絶滅や進化が記録されており、宇宙物質流入量の変動は、気温や大気組成の変動と同じく、地球生命史において重要な役割を持つことを示した。

  • 日本地質学会小澤儀明賞

    2013.9   日本地質学会   付加体の海洋性岩石を用いた地球環境変動に関する研究

  • 日本地質学会小藤賞

    2012.9   日本地質学会   受賞論文:中部日本,美濃帯の上部トリアス系チャートから発見した Ni に富むスピネル 粒子

  • 日本地質学会西日本支部例会 優秀発表賞(川上高平、池上直樹、尾上哲治)

    2023.3   日本地質学会   熊本県南部黒瀬川帯(日奈久帯)の上部ジュラ系~下部白亜系の層序と堆積環境

  • 日本地質学会研究奨励賞

    2005.9  

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Papers

  • Unveiling a new oceanic anoxic event at the Norian/Rhaetian boundary (Late Triassic)

    Manuel Rigo, Xin Jin, Linda Godfrey, Miriam E. Katz, Honami Sato, Yuki Tomimatsu, Mariachiara Zaffani, Matteo Maron, Sara Satolli, Giuseppe Concheri, Alessandra Cardinali, Qiangwang Wu, Yixing Du, Jerry Zhen Xiao Lei, Connor S. van Wieren, Lydia S. Tackett, Hamish Campbell, Angela Bertinelli, Tetsuji Onoue

    Scientific Reports   14 ( 1 )   15574   2024.7   ISSN:2045-2322 eISSN:2045-2322

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    Abstract

    The latest Triassic was characterised by protracted biotic extinctions concluding in the End-Triassic Extinction (~ 200 Ma) and a global carbon cycle perturbation. The onset of declining diversity is closely related to reducing conditions that spread globally from upper Sevatian (uppermost Norian) to across the Norian-Rhaetian boundary, likely triggered by unusually high volcanic activity. We correlate significant organic carbon cycle perturbations to an increase of CO<sub>2</sub> in the ocean–atmosphere system, likely outgassed by the Angayucham igneous province, the onset of which is indicated by the initiation of a rapid decline in <sup>87</sup>Sr/<sup>86</sup>Sr and <sup>188</sup>Os/<sup>187</sup>Os seawater values. A possible causal mechanism involves elevated CO<sub>2</sub> levels causing global warming and accelerating chemical weathering, which increased nutrient discharge to the oceans and greatly increased biological productivity. Higher export production and oxidation of organic matter led to a global O<sub>2</sub> decrease in marine water across the Norian/Rhaetian boundary (NRB). Biotic consequences of dysoxia/anoxia include worldwide extinctions in some fossil groups, such as bivalves, ammonoids, conodonts, radiolarians.

    DOI: 10.1038/s41598-024-66343-z

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    Other Link: https://www.nature.com/articles/s41598-024-66343-z

  • A dilute sodium hydroxide technique for radiolarian extraction from cherts

    Tetsuji Onoue, Sakiko Hori, Yuki Tomimatsu, Manuel Rigo

    Scientific Reports   14 ( 1 )   12831   2024.6   ISSN:2045-2322 eISSN:2045-2322

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    Radiolarians have been used to determine geological ages and have contributed markedly to our understanding of Earth’s history. Hydrofluoric acid (HF) has traditionally been used to extract radiolarian fossils from siliceous deposits (i.e., radiolarian cherts), but this acid is strictly regulated because of environmental and human health concerns. Here we report on the successful extraction of radiolarians from cherts using a low-concentration NaOH solution (1 mol/L NaOH) as an alternative to HF. The degree of chert dissolution in NaOH is strongly temperature-dependent and is limited at < 80 °C. However, even a 1 mol/L NaOH solution is sufficient to dissolve chert at 100 °C. Our new NaOH method yields better-preserved radiolarian fossils compared with the conventional HF method. The 1 mol/L NaOH solution is less hazardous, easier to handle, and has fewer effects on the environment and human health than HF. Therefore, this method can be widely used for research and teaching purposes in studies of radiolarian fossils, even in institutions where HF cannot be used owing to chemical restrictions.

    DOI: 10.1038/s41598-024-63755-9

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  • Weathering trends in the Norian through geochemical and rock magnetic analyses from the Pignola-Abriola section (Lagonegro Basin, Italy)

    Matteo Maron, Tetsuji Onoue, Sara Satolli, Katsuhito Soda, Honami Sato, Giovanni Muttoni, Manuel Rigo

    Climate of the Past   20 ( 3 )   637 - 658   2024.3   ISSN:1814-9324 eISSN:1814-9332

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    We investigated the geochemical and rock magnetic properties of the magnetostratigraphically calibrated Pignola-Abriola section (Italy) in order to understand the climatic perturbations that characterize the late Norian-early Rhaetian interval (Late Triassic). We performed experiments on anhysteretic and isothermal remanence (ARM and IRM) and on magnetic susceptibility (χ) to obtain the rock magnetic parameters necessary for our paleoclimatic investigation. An episode of increase in the relative quantity of hematite, suggesting the enhanced subaerial oxidation of iron minerals, was identified in the Norian from ~217 Ma in the Alaunian up to ~211 Ma in the early Sevatian, followed by a decline up to 207-206 Ma at the end of the Norian (late Sevatian). The results of geochemical and multivariate statistical analyses support a long-term increase and reduction in rock weathering, confirming and extending previous 87Sr / 86Sr data from the Pizzo Mondello section (Italy). Possible causes of these long-term weathering trends are the multiphase uplifting of the Cimmerian orogen, occurring at mid-northern latitudes along the southern margin of Asia in the Late Triassic, and/or the northward motion of Pangea across the equatorial humid belt. Rapid excursions in oxidized iron minerals have also been observed across the Norian-Rhaetian boundary, the origin of which still has to be determined.

    DOI: 10.5194/cp-20-637-2024

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  • Petrography and stratigraphic Os isotopic ages of ferromanganese nodules from the Northwest Pacific east of Minamitorishima Island

    Tatsuo Nozaki, Kosuke T. Goto, Yutaro Takaya, Kazuhiko Shimada, Akira Owada, Gen Shimoda, Jun-Ichi Kimura, Qing Chang, Tetsuji Onoue, Shiki Machida, Teruaki Ishii, Kenji Shimizu, Naoto Hirano, Kazuhide Mimura, Moei Yano, Junichiro Ohta, Yasuhiro Kato

    Journal of Asian Earth Sciences: X   11   100176 - 100176   2024.3   ISSN:2590-0560

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    DOI: 10.1016/j.jaesx.2024.100176

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  • Pelagic responses to oceanic anoxia during the Carnian Pluvial Episode (Late Triassic) in Panthalassa Ocean

    Tomimatsu, Y; Nozaki, T; Onoue, T; Matsumoto, H; Sato, H; Takaya, Y; Kimura, JI; Chang, Q; Rigo, M

    SCIENTIFIC REPORTS   13 ( 1 )   16316   2023.9   ISSN:2045-2322

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    The Carnian Pluvial Episode (CPE) was a short interval of extreme rainfall in the Late Triassic that caused significant changes in marine ecosystems. Global warming induced by Wrangellia volcanism is thought to have resulted in oceanic anoxia during the CPE, but the global extent, duration, and severity of anoxia, and its effects on major marine taxa, remain unclear. To address this, we examined an equatorial record of conditions in the Panthalassa Ocean during the CPE, focusing on marine Os isotope data, redox conditions, and conodont and radiolarian biostratigraphy. The results show that Wrangellia volcanism peaked in the latest Julian (early Carnian), coinciding with development of reducing conditions in the deep-sea Panthalassa. A strong conodont turnover occurred during the period of oceanic anoxia, whereas radiolarians were less affected and their diversity increased after the recovery from anoxia. The increased radiolarian diversity during the early Tuvalian (late Carnian) can be attributed to chemical weathering and enhanced nutrient fluxes associated with global warming and the more humid climate of Pangea.

    DOI: 10.1038/s41598-023-43525-9

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  • Rhenium–osmium isotope evidence for the onset of volcanism in the central Panthalassa Ocean during the Norian “chaotic carbon episode”

    Honami Sato, Tatsuo Nozaki, Tetsuji Onoue, Akira Ishikawa, Katsuhito Soda, Kazutaka Yasukawa, Jun-Ichi Kimura, Qing Chang, Yasuhiro Kato, Manuel Rigo

    Global and Planetary Change   229   104239 - 104239   2023.9   ISSN:0921-8181 eISSN:1872-6364

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    The late Norian “chaotic carbon episode” in the Late Triassic has been identified in North America, Italy, and China, reflecting a global carbon isotope perturbation. Although it has been suggested that catastrophic events, such as the emplacement of large igneous provinces, were the cause of this perturbation, direct evidence for volcanic forcing is lacking. In order to investigate the cause of the global “chaotic carbon episode” in the late Norian, we obtained osmium and organic carbon isotope data (187Os/188Os and δ13Corg) and major, trace, and highly siderophile element data and documented changes in radiolarian assemblages in a middle–upper Norian bedded chert succession in the Sakahogi section, Japan, deposited in a low-latitude zone of the Panthalassa Ocean. The δ13Corg data exhibit a significant carbon isotope excursion (CIE) during the late Norian (Sevatian 1) Mockina bidentata conodont zone. High-resolution 187Os/188Os data exhibit two negative shifts during the CIE, which are interpreted as related to volcanic activity. The biostratigraphic age and Os isotopic mass balance considerations for the ocean suggest that the onset of Angayucham volcanism was the source of unradiogenic Os that caused the decrease in seawater 187Os/188Os ratios during the Sevatian. A remarkable diversification of radiolarians with a large Mesosaturnalis bloom occurred during the low-187Os/188Os interval. This suggests that the Sevatian Mesosaturnalis species are likely indicators of the onset of Angayucham volcanism.

    DOI: 10.1016/j.gloplacha.2023.104239

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  • A new method for extracting conodonts and radiolarians from chert with NaOH solution Reviewed International journal

    M Rigo, @T Onoue, Q Wu, Y Tomimatsu, L Santello, Y Du, X Jin, A Bertinelli

    Palaeontology   66 ( 4 )   e12672   2023.8

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  • A new method for extracting conodonts and radiolarians from chert with <scp>N</scp>a<scp>OH</scp> solution

    Manuel Rigo, Tetsuji Onoue, Qiangwang Wu, Yuki Tomimatsu, Lisa Santello, Yixing Du, Xin Jin, Angela Bertinelli

    Palaeontology   66 ( 4 )   2023.7   ISSN:0031-0239 eISSN:1475-4983

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    Publishing type:Research paper (scientific journal)   Publisher:Wiley  

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    Microfossils are important components of sedimentary rocks used for palaeontological, biostratigraphic, palaeoenvironmental and palaeoclimatic investigations. They are usually extracted from rocks using an acid solution, which might vary depending on the embedding rock lithology. Here we propose a new method using common NaOH (sodium hydroxide; soda) to digest cherts (micro‐ and cryptocrystalline quartz) instead of the standard technique based on HF (hydrofluoric acid). This new method allows the collection of undamaged specimens of different kinds of microfossils, such as conodonts, radiolarians, teeth and dermal scales, the minerology of which is still preserved (e.g. biogenic apatite in conodonts). The use of soda is thus recommended, as it is less dangerous, less expensive, and it better preserves the extracted microfossils both in shape and mineralogy.

    DOI: 10.1111/pala.12672

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  • Lower Jurassic conodonts from the Inuyama area of Japan: implications for conodont extinction

    Yixing Du, Tetsuji Onoue, Yuki Tomimatsu, Qiangwang Wu, Manuel Rigo

    Frontiers in Ecology and Evolution   11   2023.5   ISSN:2296-701X eISSN:2296-701X

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    It is generally accepted that conodonts went extinct at the end of the Triassic, but younger conodont fossils have been reported, and it is becoming clear that conodont extinction occurred asynchronously across different regions. Although some reports of post-Triassic conodonts have been disproven, Lower Jurassic conodonts have been found in the Buda area of Hungary and the Inuyama area of Japan. Here, we report the discovery of more conodonts Misikella posthernsteini above the first occurrence of the typical Jurassic radiolarian Pantanellium tanuense, which is not know from the Triassic, in the Kastuyama section, Inuyama area, reaffirming the authenticity of the Lower Jurassic conodonts. The conodonts survived into the Jurassic in the Inuyama area might be due to their remote locations relative to the Central Atlantic Magmatic Province, which buffered them from hypoxia and ocean acidification. Although conodont survived into the Lower Jurassic, they failed to recover and quickly went extinct in post-extinction ecosystems. The “dead clades walking” (DCWs) of conodont may have been due to protracted ocean acidification in the earliest Jurassic. Food scarcity and competition with other organisms may have led to the eventual extinction of conodonts.

    DOI: 10.3389/fevo.2023.1135789

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  • Climax in Wrangellia LIP activity coincident with major Middle Carnian (Late Triassic) climate and biotic changes: Mercury isotope evidence from the Panthalassa pelagic domain Invited Reviewed International journal

    Xin Jin, Yuki Tomimatsu, Runsheng Yin, Tetsuji Onoue, Marco Franceschi, Stephen E. Grasby, Yixing Du, Manuel Rigo

    Earth and Planetary Science Letters   607   118075 - 118075   2023.4   ISSN:0012-821X eISSN:1385-013X

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    The Carnian Pluvial Episode (CPE, ∼233 Ma) was characterized by multiple negative carbon-isotope excursions, turnovers in marine and terrestrial biota, and a Tethys-wide humid climate accompanied by abundant terrigenous sediment and freshwater input into sedimentary basins. A general temporal coincidence between the CPE and the emplacement of the Wrangellia Large Igneous Province (Wrangellia LIP) has been well documented, however, it remains unclear whether fluctuations in the intensity of the LIP's activity could be linked to the biotic and climate changes at the CPE. We here present mercury (Hg) concentration and isotope ratio records from a pelagic deep-water succession (Section N-O, Inuyama, Japan) that encompasses the CPE interval. Data reveal concurrent peaks in the Hg concentrations and ratios of Hg to TOC and enrichment factors ThEF, AlEF, ZnEF, and NiEF implying that excess Hg loading in the sediments occurred, likely due to volcanic activity, prior to the CPE siliciclastic input. Furthermore, Δ199Hg values show a negative shift across the boundary between the Julian 1 and Julian 2, followed by a positive shift up to near-zero values at the Julian/Tuvalian transition. The near-zero Δ199Hg values at the Julian/Tuvalian boundary are associated with an increase in Hg and Cu loading, suggesting a peak of volcanogenic Hg and Cu input that may indicate a climax in the Wrangellia LIP activity. Most notably, the Julian/Tuvalian transition is where evidence of the most pronounced changes in carbonate platform evolution, biological turnover and climate change associated with the event has been highlighted. Our results therefore suggest that variations in the intensity of LIP volcanism may have played a major role in driving biotic and climate changes during the CPE. Our results provide a model for other mass extinction events associated with LIPs (e.g., the end-Permian) where low-intensity background volcanism was punctuated by high-intensity pulses, these latter being the real killers.

    DOI: 10.1016/j.epsl.2023.118075

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  • Older magma at Aso caldera than at Unzen stratovolcano in south west Japan as recorded through helium isotopes Invited Reviewed International journal

    Sano, Yuji; Kagoshima, Takanori; Zhang, Maoliang; Takahata, Naoto; Onoue, Tetsuji; Shibata, Tomo; Nishio, Yoshiro; Chen, Ai-Ti; Lee, Hyunwoo; Fischer, Tobias P.; Zhao, Dapeng

    COMMUNICATIONS EARTH & ENVIRONMENT   4 ( 1 )   2023.1   eISSN:2662-4435

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

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    Stratovolcanoes form conical mountains by ejecta and lava, while caldera volcanoes have depressions caused by post caldera collapse. Few studies have investigated relationships between this morphology difference and discharged fluid geochemistry. Here we present helium isotope ratios of geothermal fluids and groundwater inside and outside the caldera of Mt. Aso, Japan, and compare these to helium ratios in groundwater at Mt. Unzen, a stratovolcano in the same tectonic field. We find that helium isotopes decrease in proportion to distance from the central part of the volcano. However, the helium isotopes of inferred magmas are lower in Mt. Aso relative to Mt. Unzen. We combine this result with seismic tomography data and suggest that Mt. Aso may not be receiving new mantle material to the magma reservoir. Thus, we conclude that the caldera volcano Mt Aso probably features older magma and more developed geothermal systems than the stratovolcano Mt. Unzen.

    DOI: 10.1038/s43247-022-00649-6

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    Other Link: https://www.nature.com/articles/s43247-022-00649-6

  • Sedimentology and biostratigraphy of the upper Triassic carbonates from the Shiriya cape, North Kitakami Belt, Japan Invited Reviewed International journal

    Peyrotty, Giovan; Fucelli, Andrea; Peybernes, Camille; Onoue, Tetsuji; Ueda, Hayato; Martini, Rossana

    ISLAND ARC   31 ( 1 )   2022.11   ISSN:1038-4871 eISSN:1440-1738

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    Relics of the Panthalassa Ocean occur today in accretionary complexes and terranes on the entire Circum-Pacific region. Among them, remains of shallow-water carbonate systems provide valuable information about the ecology and environmental conditions that prevailed in this immense ocean. In this regard, the Shiriya Cape of the North Kitakami Belt (Aomori Prefecture, Honshu Island, Japan) is an essential place to study. Characterized by the presence of numerous limestone deposits embedded in typical accretionary mélange, including pluri-kilometric massive slabs and metric bedded deposits, the cape is indeed a key vestige of carbonate deposition in the Panthalassa. All the limestone outcrop form the Shiriya Cape were sampled and studied in detail for the first time. Despite a general poor preservation, macroscopic sedimentary features such as burrows and large megalodontids patches as well as four microfacies were identified and are presented in detail in this work. On the basis of foraminifers and conodonts biostratigraphy, the age of the limestone deposits is defined as Norian. Similarities with analogous and synchronous systems from Panthalassan and Tethyan realms are extensively discussed. The closest analog to the Shiriya limestone appears to be the Panthalassan Dalnegorsk limestone (Russian Far East), both regarding microfacies and depositional setting. Sedimentary successions similar to Lofer-cycles, well known in Tethyan synchronous systems, were also discovered in the Shiriya Cape. Along with the large limestone slabs, countless limestone-bearing conglomerates also crop out on the Shiriya Cape. Their study and comparison with similar deposits in Japan highlighted their importance in the understanding of the dismantling of mid-oceanic carbonates. The observations and comparison with well-known carbonate systems permitted to establish a hypothetical depositional model of the Shiriya limestone corresponding to a Norian isolated carbonate system developed on an immerged volcanic seamount.

    DOI: 10.1111/iar.12473

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  • Extreme continental weathering in the northwestern Tethys during the end-Triassic mass extinction Invited Reviewed International journal

    Palaeogeography, Palaeoclimatology, Palaeoecology   2022.4

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    DOI: https://doi.org/10.1016/j.palaeo.2022.110934

  • Terrestrial record of carbon-isotope shifts across the Norian/Rhaetian boundary: A high-resolution study from northwestern Sichuan Basin, South China Reviewed International journal

    X Jin, JG Ogg, S Lu, Z Shi, DB Kemp, X Hua, @T Onoue, M Rigo

    Global and Planetary Change   2022.2

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    DOI: https://doi.org/10.1016/j.gloplacha.2022.103754

  • Conodont and radiolarian biostratigraphic age constraints on Carnian (Upper Triassic) chert-hosted stratiform manganese deposits from Panthalassa: Formation of deep-sea mineral resources during the Carnian pluvial episode Reviewed International journal

    Y. Tomimatsu, @T. Onoue, M. Rigo

    Marine Micropaleontology   171   102084   2022.1

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    DOI: https://doi.org/10.1016/j.marmicro.2021.102084

  • Sedimentary record of Upper Triassic impact in the Lagonegro Basin, southern Italy: Insights from highly siderophile elements and Re-Os isotope stratigraphy across the Norian/Rhaetian boundary Reviewed International journal

    H Sato, A Ishikawa, @T Onoue, Y Tomimatsu, M Rigo

    Chemical Geology   586   120506   2021.12

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    DOI: https://doi.org/10.1016/j.chemgeo.2021.120506

  • The case for the Global Stratotype Section and Point (GSSP) for the base of the Norian stage Reviewed International journal

    Albertiana   46   25 - 57   2021.12

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  • The evolutionary process from Mockina bidentata to Parvigondolella andrusovi: evidence from the Pizzo Mondello Section, Sicily, Italy Invited Reviewed International journal

    Yixing Du, Tetsuji Onoue, Viktor Karádi, Ian S. Williams, Manuel Rigo

    32   667 - 676   2021.6

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  • Marine osmium isotope record during the Carnian “pluvial episode” (Late Triassic) in the pelagic Panthalassa Ocean Reviewed International journal

    197   2021.2

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    DOI: 10.1016/j.gloplacha.2020.103387

  • Development of deep-sea anoxia in Panthalassa during the Lopingian (late Permian): Insights from redox-sensitive elements and multivariate analysis Invited Reviewed International journal

    Tetsuji Onoue, Katsuhito Soda, Yukio Isozaki

    Frontiers in Earth Science   8   2021.1

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    DOI: 10.3389/feart.2020.613126

  • Middle-Late Triassic radiolarian assemblages from chert clasts of the Excelsior Gulch conglomerate (Wallowa terrane, Oregon, U.S.A.) Reviewed International journal

    39 ( 2 )   565 - 579   2020.12

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  • Biotic and environmental changes in the Panthalassa Ocean across the Norian (Late Triassic) impact event Reviewed International journal

    Sato, H., Takaya, Y., Yasukawa, K., Fujinaga, K., Onoue, T., and Kato, Y.

    Progress in Earth and Planetary Science   7 ( 1 )   61   2020.10

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  • Scarcity of chert in upper Lower Triassic Panthalassic deep-sea successions of Japan records elevated clastic inputs rather than depressed biogenic silica burial flux following the end-Permian extinction Reviewed International journal

    Muto, S., Takahashi, S., Yamakita, S., and Onoue, T.

    Global and Planetary Change   195   103330   2020.10

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  • Birth and death of seamounts in the Panthalassa Ocean: Late Triassic to Early Jurassic sedimentary record at Mount Sambosan, Shikoku, Southwest Japan Reviewed International journal

    Global and Planetary Change   192   103250   2020.9

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  • Groundwater oxygen anomaly related to the 2016 Kumamoto earthquake in Southwest Japan Invited Reviewed International journal

    Yuji SANO, Satoki ONDA, Takanori KAGOSHIMA, Toshihiro MIYAJIMA, Naoto TAKAHATA, Tomo SHIBATA, Chika NAKAGAWA, Tetsuji ONOUE, Nak Kyu KIM, Hyunwoo LEE, Minoru KUSAKABE, Daniele L. PINTI

    Proceedings of the Japan Academy, Series B   96 ( 7 )   322 - 334   2020.7

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  • The Late Triassic Extinction at the Norian/Rhaetian boundary: Biotic evidence and geochemical signature Invited Reviewed International journal

    Rigo, Manuel, Tetsuji Onoue, Lawrence H. Tanner, Spencer G. Lucas, Linda Godfrey, Miriam E. Katz, Mariachiara Zaffani, Kliti Grice, Jaime Cesar, Daisuke Yamashita, Matteo Maron, Lydia S. Tackett, Hamish Campbell, Fabio Tateo, Giuseppe Concheri, Claudia Agnini, Marco Chiari, and Angela Bertinelli

    Earth-Science Reviews   204   2020.5

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  • The asynchronous disappearance of conodonts: New constraints from Triassic-Jurassic boundary sections in the Tethys and Panthalassa Reviewed International journal

    Earth-Science Reviews   203   2020.4

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  • 古生代末(2.5億年前)大量絶滅層準の高いヘリウム同位体記録─冥王代以来の地球史を通した地球外物質流入同定方法の探索─ Reviewed

    高畑直人,尾上哲治,佐野有司,磯﨑行雄

    地学雑誌   128   667 - 679   2019.9

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  • Triassic marine Os isotope record from a pelagic chert succession, Sakahogi section, Mino Belt, southwest Japan Reviewed International journal

    Nozaki, T., Nikaido, T., Onoue, T., Takaya, Y., Sato, K., Kimura, J.I., Chang, Q., Yamashita, D., Sato, H., Suzuki, K., Kato, Y. and Matsuoka, A.

    Journal of Asian Earth Sciences   1 ( 15 )   2019.6

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  • Multivariate analysis of geochemical compositions of bedded chert during the Middle Triassic (Anisian) oceanic anoxic events in the Panthalassic Ocean Invited Reviewed International journal

    Soda, Katsuhito; @Onoue, Tetsuji

    GEOCHEMICAL JOURNAL   53 ( 2 )   91 - 102   2019.4

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  • Conodont-based age calibration of the Middle Triassic Anisian radiolarian biozones in pelagic deep-sea bedded chert Reviewed International journal

    Muto, Shun; Takahashi, Satoshi; Yamakita, Satoshi; Soda, Katsuhito; @Onoue, Tetsuji

    Bulletin of the Geological Survey of Japan   ( 70 )   43 - 89   2019.3

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  • Enhanced flux of extraterrestrial He-3 across the Permian-Triassic boundary Invited Reviewed International journal

    @Onoue, Tetsuji; Takahata, Naoto; Miura, Mitsutaka; Sato, Honami; Ishikawa, Akira; Soda, Katsuhito; Sano, Yuji; Isozaki, Yukio

    PROGRESS IN EARTH AND PLANETARY SCIENCE   6   2019.2

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  • 美濃帯層状チャートの堆積機構に関する3つの問題 Reviewed

    @尾上哲治

    地質学雑誌   124   1021 - 1032   2018.12

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  • Paleoenvironmental reconstruction for termination stage of Superanoxia in Middle Triassic (Anisian) sedimentary sequence of the Mino belt, central Japan Invited Reviewed International journal

    Soda, Katsuhito; @Onoue, Tetsuji

    ISLAND ARC   27 ( 6 )   2018.11

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  • Sr isotope variations in the Upper Triassic succession at Pizzo Mondello, Sicily: Constraints on the timing of the Cimmerian Orogeny Invited Reviewed International journal

    @Onoue, Tetsuji; Yamashita, Katsuyuki; Fukuda, Chise; Soda, Katsuhito; Tomimatsu, Yuki; Abate, Benedetto; Rigo, Manuel

    PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY   499   131 - 137   2018.6

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  • Integrated Upper Triassic conodont and radiolarian biostratigraphies of the Panthalassa Ocean Invited Reviewed International journal

    Yamashita, Daisuke; Kato, Hikaru; @Onoue, Tetsuji; Suzuki, Noritoshi

    PALEONTOLOGICAL RESEARCH   22 ( 2 )   167 - 197   2018.4

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  • Triassic and Jurassic radiolarian response to global catastrophic events in the Panthalassa Ocean, as recorded in the Mino Belt, central Japan Invited Reviewed

    @Onoue, T., Kojima, S., Hori, R.

    Science Reports of Niigata University (Geology)   ( 32 )   29 - 69   2017.6

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  • Integrated bio-magnetostratigraphy of an Upper Triassic pelagic sequence from Panthalassa Ocean Reviewed International journal

    Yamashita, D., Uno, K., @Onoue, T.

    Progress on Conodont Investigation. Cuadernos del Museo Geominero, no. 22   ( 22 )   265 - 268   2017.5

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  • Palaeoenvironmental changes across the Carnian/Norian boundary in the Black Bear Ridge section, British Columbia, Canada Reviewed International journal

    @Onoue, T., Zonneveld, J.-P., Orchard, M. J., Yamashita, M., Yamashita, K., Sato, H., Kusaka, S.

    Palaeogeography Palaeoclimatology Palaeoecology   ( 441 )   721 - 733   2016.12

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  • Mid-oceanic shallow-water carbonates of the Panthalassa domain: new microfacies data from the Sambosan Accretionary Complex, Shikoku Island, Japan Reviewed International journal

    Peybernes, C., Chablais, J., @Onoue, T., Martini, R.

    Facies   ( 62 )   1 - 24   2016.12

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  • Groundwater helium anomaly reflects strain change during the 2016 Kumamoto earthquake in Southwest Japan Invited Reviewed International journal

    Y Sano, N Takahata, T Kagoshima, T Shibata, @T Onoue, D Zhao

    SCIENTIFIC REPORTS   6   2016.11

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  • Paleoecology, biogeography, and evolution of reef ecosystems in the Panthalassa Ocean during the Late Triassic: Insights from reef limestone of the Sambosan Accretionary Complex, Shikoku, Japan Invited Reviewed International journal

    Peybernes, Camille; Chablais, Jerome; @Onoue, Tetsuji; Escarguel, Gilles; Martini, Rossana

    PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY   457   31 - 51   2016.9

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  • Bolide impact triggered the Late Triassic extinction event in equatorial Panthalassa Invited Reviewed International journal

    @Onoue, Tetsuji; Sato, Honami; Yamashita, Daisuke; Ikehara, Minoru; Yasukawa, Kazutaka; Fujinaga, Koichiro; Kato, Yasuhiro; Matsuoka, Atsushi

    SCIENTIFIC REPORTS   6   2016.7

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  • 大分県東部佐伯地域の秩父帯に産する層状マンガン鉱床の層序と放散虫化石年代 Reviewed

    冨松由希, @尾上哲治, 野崎達生

    地質学雑誌   ( 122 )   478 - 493   2016.6

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  • 沖縄県辺戸岬,上部三畳系今帰仁層の岩相層序とコノドントおよびアンモナイト化石年代 Reviewed

    山下大輔, 安田知佳, 石橋毅, Rossana Martini, @尾上哲治

    地質学雑誌   ( 122 )   478 - 493   2016.6

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  • Sedimentary PGE signatures in the Late Triassic ejecta deposits from Japan: Implications for the identification of impactor Invited Reviewed International journal

    Sato, Honami; Shirai, Naoki; Ebihara, Mitsuru; @Onoue, Tetsuji; Kiyokawa, Shoichi

    PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY   442   36 - 47   2016.1

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  • Paleomagnetism of Triassic bedded chert from Japan for determining the age of an impact ejecta layer deposited on pen-equatorial latitudes of the paleo-Pacific Ocean: A preliminary analysis Invited Reviewed International journal

    Uno, Koji; Yamashita, Daisuke; @Onoue, Tetsuji; Uehara, Daiki

    PHYSICS OF THE EARTH AND PLANETARY INTERIORS   249   59 - 67   2015.12

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  • Oceanic island basalts in accretionary complexes of SW Japan: Tectonic and petrogenetic implications Reviewed International journal

    Safonova, I., Kojima, S., Nakae, S., Romer, R.L., Seltmann, R., Sano, H., @Onoue, T.

    Journal of Asian Earth Sciences   ( 113 )   508 - 523   2015.12

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  • Upper Triassic reef corals from the Sambosan Accretionary Complex, Kyushu, Japan Invited Reviewed International journal

    Stanley, George D., Jr.; @Onoue, Tetsuji

    FACIES   61 ( 2 )   2015.4

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  • Osmium isotope evidence for a large Late Triassic impact event Invited Reviewed International journal

    Sato, Honami; @Onoue, Tetsuji; Nozaki, Tatsuo; Suzuki, Katsuhiko

    NATURE COMMUNICATIONS   4   2013.9

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  • Deep-sea record of impact apparently unrelated to mass extinction in the Late Triassic Invited Reviewed International journal

    @Onoue, Tetsuji; Sato, Honami; Nakamura, Tomoki; Noguchi, Takaaki; Hidaka, Yoshihiro; Shirai, Naoki; Ebihara, Mitsuru; Osawa, Takahito; Hatsukawa, Yuichi; Toh, Yosuke; Koizumi, Mitsuo; Harada, Hideo; Orchard, Michael J.; Nedachi, Munetomo

    PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA   109 ( 47 )   19134 - 19139   2012.11

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  • Palaeomagnetism of Middle Triassic red bedded cherts from southwest Japan: equatorial palaeolatitude of primary magnetization and widespread secondary magnetization Invited Reviewed International journal

    Uno, Koji; @Onoue, Tetsuji; Hamada, Kazumasa; Hamami, Saki

    GEOPHYSICAL JOURNAL INTERNATIONAL   189 ( 3 )   1383 - 1398   2012.6

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  • Early Triassic peritidal carbonate sedimentation on a Panthalassan seamount: the Jesmond succession, Cache Creek Terrane, British Columbia, Canada Invited Reviewed International journal

    Hiroyoshi Sano, @Tetsuji Onoue, Michael J. Orchard, Rossana Martini

    Facies   58 ( 1 )   2012.1

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  • Upper Triassic foraminifers from Panthalassan carbonate buildups of Southwestern Japan and their paleobiogeographic implications Invited Reviewed International journal

    Chablais, Jerome; Martini, Rossana; Kobayashi, Fumio; Stampfli, Gerard M.; @Onoue, Tetsuji

    MICROPALEONTOLOGY   57 ( 2 )   93 - 124   2011.6

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  • Composition and accretion rate of fossil micrometeorites recovered in Middle Triassic deep-sea deposits Invited Reviewed International journal

    @Onoue, Tetsuji; Nakamura, Tomoki; Haranosono, Takeshi; Yasuda, Chika

    GEOLOGY   39 ( 6 )   567 - 570   2011.6

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  • Preservation of larval bivalve shells in a radiolarian chert in the Late Triassic (Early Norian) interval of the Malampaya Sound Group, Calamian Island, western Philippines Invited Reviewed International journal

    @Onoue, Tetsuji; Nikaido, Takashi; Zamoras, Laurence R.; Matsuoka, Atsushi

    MARINE MICROPALEONTOLOGY   79 ( 1-2 )   58 - 65   2011.4

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  • Upper Triassic reef-limestone blocks of southwestern Japan: New data from a Panthalassan seamount Invited Reviewed International journal

    Chablais, Jerome; @Onoue, Tetsuji; Martini, Rossana

    PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY   293 ( 1-2 )   206 - 222   2010.7

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  • Aulotortus friedli from the Upper Triassic gravitational flow deposits of the Kumagawa River (Kyushu, Southwest Japan) Invited Reviewed International journal

    Chablais, Jerome; Martini, Rossana; @Onoue, Tetsuji

    PALEONTOLOGICAL RESEARCH   14 ( 2 )   151 - 160   2010.6

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  • Orthopyroxene-cordierite mafic gneiss from the Nomamisaki metamorphic rocks, Southern Kyushu, Japan: Implication for western continuation of the Usuki-Yatsushiro Tectonic Line Invited Reviewed International journal

    Ikeda, Takeshi; Hiramine, Aya; @Onoue, Tetsuji

    ISLAND ARC   19 ( 2 )   230 - 242   2010.6

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  • Microfacies and depositional setting of the Upper Triassic mid-oceanic atoll-type carbonates of the Sambosan Accretionary Complex (southern Kyushu, Japan) Invited Reviewed International journal

    FACIES   56 ( 2 )   2010.4

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  • Impact of coronavirus disease 2019 on medical practice in endocrine and metabolic diseases in Japan: a nationwide surveillance study conducted by the Japan Endocrine Society

    Manaka, K; Kato, S; Sakamoto, R; Yamakage, H; Uema, T; Kawai, S; Shibata, M; Hiratsuka, I; Nakachi, S; Onoue, T; Tsuchiya, T; Fukui, M; Hashimoto, K; Suzuki, A; Makita, N; Ogawa, Y; Arima, H; Satoh-Asahara, N; Masuzaki, H

    ENDOCRINE JOURNAL   71 ( 5 )   499 - 514   2024   ISSN:0918-8959 eISSN:1348-4540

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  • (entry) Conodont and radiolarian biostratigraphy at the Norian/Rhaetian boundary (Late Triassic) in the Inuyama area, Mino Belt, central Japan

    OSHIMA Atsushi, ONOUE Tetsuji, TOMIMATSU Yuki, RIGO Manuel

    Annual Meeting of the Geological Society of Japan   2023 ( 0 )   402   2023   ISSN:13483935 eISSN:21876665

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    <p>後期三畳紀レーティアンは,中央大西洋火成岩岩石区(CAMP)における大規模火山活動が引き金となって発生した三畳紀末大量絶滅に先行して,段階的な生物の絶滅が起こった時代として知られている.後期三畳紀ノーリアン/レーティアン境界では,炭素同位体比の負異常に伴い,代表的な海生生物(例えば,放散虫やコノドント,アンモナイト)の絶滅および種数の減少が報告されてきた.このうち,炭素同位体比の負の異常は,当時のパンサラッサ海を超えてパンゲア大陸の東西両側及び,北半球,南半球の両方で記録されており,世界的な炭素循環の変動が起こったと考えられている(Rigo et al., 2020).これらの後期三畳紀レーティアンの段階的な生物絶滅や環境変動は,当時のパンサラッサ海遠洋域で堆積した深海堆積物である日本のジュラ紀付加体中の層状チャートにも記録されていると推測される.しかし,ジュラ紀付加体中の層状チャートは主に放散虫化石層序に基づいて年代決定がなされており,大陸縁辺での層序復元に用いられる国際標準のアンモナイトやコノドント化石層序との対比が十分に行われていない.そのため,層状チャートと他地域のノーリアン/レーティアン境界付近における地質記録の厳密な対比を行うことは難しいという問題がある.そこで本研究では,岐阜県犬山地域に露出する美濃帯上部三畳系ノーリアン〜レーティアン層状チャートから産出したコノドントおよび放散虫化石を報告し,ノーリアン/レーティアン境界の層準および指標となる化石種(コノドント,放散虫)を確定することを目的としてコノドント・放散虫統合化石層序の構築を行った.研究では,岐阜県坂祝町の木曽川右岸露頭から採取したチャート試料(22試料)について微化石処理を行い,放散虫およびコノドント化石を抽出した.得られた放散虫・コノドント化石については,Sugiyama (1997)の放散虫化石帯およびRigo et al. (2018)のコノドント化石帯に従って,コノドント・放散虫統合化石層序の作成と年代決定を行った. 研究の結果,検討セクションからSkirtFや<i>Praemesosaturnalis heilongjiangensis</i>,<i>Livarella densiporata</i>などの中期〜後期ノーリアン,前期レーティアンを示す放散虫化石9属21種が産出した.これまで後期ノーリアンの指標種とされてきた<i>Betraccium deweveri</i>は,検討セクションを通じて産出が確認された.またコノドントについては,後期ノーリアン後期を示す<i>Parvigondorella andrusovi</i>や<i>Misikella hernsteini</i>など2属5種が同定された.検討セクション最上部の<i>B. deweveri</i>最終産出層準付近では,<i>Misikella hernsteini</i>とレーティアンの基底に対比される<i>Misikalla posthernsteini</i>の中間的な形態を持つ種(<i>M. posthernsteini </i>s.l.)の産出が認められた.<i>M. posthernsteini </i>s.l. は本来記載された<i>M. posthernsteini</i>(便宜上<i>M. posthernsteini </i>s.s. とする)とは異なる特徴を有しており,<i>M. hernsteini</i>から<i>M. posthernsteini</i> s.s.へと形態が変化する段階のものであると考えられている(Caruthers et al., 2021).このことから,<i>M. posthernsteini</i> s.s.の初産出によって特徴付けられるノーリアン/レーティアン境界は,<i>B. deweveri</i>最終産出層準よりさらに上位に位置することが明らかとなった.本セクションのノーリアン/レーティアン境界のより正確な層準を決定するにあたり,<i>M. hernsteini </i>から<i>M. posthernsteini </i>s.l. および<i>M. posthernsteini</i> s.s.への進化的変化の過程について,層位分布,放散虫化石群集の変化と合わせて今後さらなる検討が必要である.引用文献:Rigo, M. et al., 2020, <i>Earth-Science Reviews,</i> 204, 103180. Rigo, M. et al., 2018, <i>The Late Triassic World,</i> Topics in Geobiology, 46, 189-235. Sugiyama, K, 1997, <i>Mizunami Fossil Mus</i>, 24, 79-193. Caruthers, A.H. et al., 2021, <i>Earth and Planetary Science Letters,</i> 577, 117262.</p>

    DOI: 10.14863/geosocabst.2023.0_402

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  • (entry) Middle Triassic radiolarian and conodont biostratigraphy and chemostratigraphy in the bedded chert of the Mino Belt

    SHIOHARA Takuma, ONOUE Tetsuji, SODA Katsuhito

    Annual Meeting of the Geological Society of Japan   2023 ( 0 )   164   2023   ISSN:13483935 eISSN:21876665

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    <p>三畳紀の気候は総じて乾燥から半乾燥の時代と考えられているが, 中期三畳紀の後期アニシアン(ペルソニアン)と後期ラディニアン(ロンゴバルディアン)では,それぞれ湿潤化イベントの存在が知られている. これら2回の湿潤化イベントの原因は不明であるが, これらが放散虫やコノドントといった中期三畳紀の主要な遠洋性・外洋性生物の多様化につながった可能性が示唆されている.そこで本研究では, 中期三畳紀の湿潤化イベントに対する放散虫およびコノドントの群集組成の変化を調べるために, 岐阜県坂祝町に分布する美濃帯の中部三畳系層状チャート(セクションO:Sugiyama, 1997)を対象に放散虫, コノドント化石層序と化学層序を検討した.セクションOの層状チャートは,パンサラッサ海赤道域の深海底堆積物と考えられている.セクション全体の層厚は,約21 mである.採取した試料は,層状チャートの珪質部(チャート)65試料と,頁岩部の43試料である.化学層序については,頁岩部の試料を用いて蛍光X線分析(XRF)を行い,主要・微量元素濃度について測定した. 本研究の結果,セクションOからはTR-2C帯(<i>Triassocampe deweveri</i>帯)からTR-5A帯(<i>Capnuchosphaera</i>帯)までの6つの放散虫化石帯が認められた.これらの放散虫化石帯が示す年代は,後期アニシアンから前期カーニアンに比較される.また, 前期ラディニアン(ファッサニアン)から後期ラディニアン(ロンゴバルディアン)にかけて,顕著な放散虫化石群集の変化が確認された.岩相層序からは,この放散虫群集の変化は, セクションOの基底から10.5 mに位置する厚い頁岩層(4 cm厚)付近で発生したと考えられる. この頁岩層を境にして, <i>Muelleritortis noblis</i>から<i>Muelleritortis cochleata</i>への棘(spine)の形態変化および,<i>Tritortis integrita</i>から<i>Tritortis kretaensis</i>への形態変化が特徴的にみられた。 化学層序を検討した結果, 調査区間では顕著な海洋酸化還元状態の変化は見られなかった.一方, コノドントや魚類などの海洋性脊椎動物に由来すると考えられる生物起源アパタイトの濃度が, 前期ラディニアン/後期ラディニアン境界を越えて増加した. さらに, WやCIA(Chemical Index of Alteration)などの大陸風化指標(Nesbitt et al., 1982 ; Ohta et al., 2007)は, 後背地の化学風化が後期ラディニアンに強まったことを示唆する. 以上の結果は,後期ラディニアンの湿潤化イベントが,パンサラッサ海の海洋性脊椎動物の生産性の増加と放散虫の群集変化のきっかけとなった可能性を示唆する. 今後はそれらの因果関係について,詳細な検討を進める必要がある.引用文献 ・Nesbitt, H.W., Young, G.M., 1982,<i> Nature</i>, <b>299</b>, 715-717 ・Ohta, T., Arai, H., 2007, <i>Chemical Geology</i>, <b>240</b>, 280-297 ・Sugiyama, K., 1997, <i>Bulletin of the</i> <i>Mizunami Fossil Mus</i>., <b>24</b>, 79-193</p>

    DOI: 10.14863/geosocabst.2023.0_164

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  • (entry) Temporal variations in extraterrestrial <sup>3</sup>He flux in the Permian and Triassic

    SETOYAMA Kohei, TAKAHATA Naoto, ONOUE Tetsuji, SHIOHARA Takuma, SANO Yuji, ISOZAKI Yukio

    Annual Meeting of the Geological Society of Japan   2023 ( 0 )   401   2023   ISSN:13483935 eISSN:21876665

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    <p>地球表層に降下する宇宙塵の総量は, 年間2700±1400トンから16000±9100トンと見積もられており,地表 1 m<sup>2</sup>あたりにもたらされる宇宙塵は年平均 0.05 mg 以下とごく少量である.しかし,大洋域の深海底で堆積した遠洋性堆積物は,大陸起源の粗粒砕屑物の流入がほとんどなく,堆積速度が非常に遅いため,他の堆積物に比べ地球外物質が濃集しやすい.そのため,遠洋性堆積物から地球外物質流入量の変動を調べることによって,小惑星帯での衝突イベントや惑星間空間に分布する塵の増減を復元できると考えられている.また,地球外物質は地球物質に比べ高いHe同位体比(<sup>3</sup>He/<sup>4</sup>He比)を持つことが知られており,深海堆積物中の³He濃度は白亜紀以降の地球への地球外物質の流入量を復元することに利用されている.しかし,ジュラ紀以前の深海底堆積物は,現在の深海底にほとんど存在しないことから,ヘリウム同位体(<sup>3</sup>He, <sup>4</sup>He)を用いたジュラ紀以前の地球外物質流入量の記録は復元されていない.  そこで本研究では,後期ペルム紀から三畳紀を対象に,ヘリウム同位体を用いて,地球外物質流入量の変動記録解読を試みた.研究対象は,美濃帯(岐阜県舟伏山地域,犬山地域)および秩父帯(大分県津久見地域)の上部ペルム系〜上部三畳系遠洋性堆積岩である層状チャートである.ヘリウム同位体分析は,東京大学大気海洋研究所の希ガス用質量分析計を用いて行った.  測定の結果,バルク分析で得られた<sup>3</sup>He濃度は,ペルム紀キャピタニアンからチャンシンジアンにかけて増加する傾向がみられた.また,ウーチャーピンジアンの最前期とチャンシンジアン最後期において,<sup>3</sup>He濃度の短期間の上昇がみられた.ペルム紀/三畳紀境界より上位層では,<sup>3</sup>He濃度は急激に低下した.<sup> 3</sup>He/<sup>4</sup>He比は,0.3〜0.8 Raの値をとり,全体としては検討セクションの下部から上部に向かって緩やかに低下する傾向がみられた.また本研究では,中期三畳紀のアニシアン後期とラディニアン後期において,地球外³Heの流入量が増加したことが明らかになった.  検討したセクションの堆積速度に基づいて地球外<sup>3</sup>Heフラックスを計算すると,ペルム紀ウーチャーピンジアン最前期,チャンシンジアン最後期,中期三畳紀アニシアン後期,ラディニアン後期において,<sup>3</sup>Heフラックスが約4〜7倍増加したことが明らかになった.この結果は,小惑星帯における大規模な衝突や長周期彗星の増加などによって,これらの時期に惑星間空間に分布する塵が増加した可能性を示唆している.またこれら4度の地球外<sup>3</sup>Heフラックス増加は,主要な海退が起こった時期と一致する.そのため,オルドビス紀のL-コンドライト母天体崩壊イベント(約466Ma; Schmitz et al., 2019)で報告されているように,宇宙塵フラックス増加が,地球規模の寒冷化と大規模な海退を引き起こした可能性がある.引用文献:Schmitz, B. et al., 2019. An extraterrestrial trigger for the mid-Ordovician ice age: Dust from the breakup of the L-chondrite parent body. Sci Adv 5, eaax4184.</p>

    DOI: 10.14863/geosocabst.2023.0_401

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  • Pelagic responses to oceanic anoxia during the Carnian Pluvial Episode (Late Triassic) in Panthalassa Ocean

    Tomimatsu Yuki, Tatsuo Nozaki, Onoue Tetsuji, Matsumoto Hironao, Sato Honami, Takaya Yutaro, Kimura Jun-ich, Chang Qing, Rigo Manuel

    Annual Meeting of the Geological Society of Japan   2023 ( 0 )   162   2023   ISSN:13483935 eISSN:21876665

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    <p>今からおよそ2億3200万年前に起こったカーニアン多雨事象は,後期三畳紀における短期間の極端な降雨で,海洋生態系に大きな変化をもたらしたことが知られている.テチス海や大陸縁辺部では,炭酸塩プラットフォーム形成の停止や,陸源砕屑物の流入量の増加,海水温の上昇などによってCPEの存在が認識されてきた(Simm et al., 1989; Dal Corso et al., 2020).これらを引き起こした原因として,前期カーニアン(ユリアン)のパンサラッサ海で起こったWrangellia火山活動が提案されており,テチス海域ではWrangellia火山活動の最盛期であるユリアン/チュバリアン境界において,温暖化や海洋無酸素化に伴ってアンモナイト,コノドントなどの遠洋性生物の絶滅が起こった可能性が示唆されている(Dal Corso et al., 2015, 2020).しかし,遠洋環境におけるその規模や期間,実際の遠洋性生物に与えた影響についてはわかっていない. そこで本研究では遠洋性堆積岩である層状チャートを用いて,海洋オスミウム同位体,海洋酸化還元状態およびコノドントと放散虫化石層序に着目し,CPEにおけるパンサラッサ海遠洋域の海洋環境変動の期間・規模,それに応答する海洋生態系について明らかにすることを目的として研究を進めた.研究対象地域として,ジュラ紀付加体中の後期三畳紀カーニアン層状チャートが露出する秩父帯(高平),丹波帯(玉岩),美濃帯(神崎,坂祝),北部北上帯(大谷山)の5つのセクションを選定し,コノドントー放散虫化石層序の検討,MC-ICP-MSによるオスミウム同位体分析,XRFおよびICP-QMSによる主要・微量元素濃度分析を行った. 本研究の結果,すべての研究地域において,オスミウム同位体比はユリアンを通じて低い値を示し,ユリアン末で最も低い値を示したのち,ユリアン/チュバリアン境界以降でオスミウム同位体比は上昇する傾向が認められた.このことから,Wrangellia 火山活動はユリアン末に活動の最盛期を迎え,低い同位体比を持つオスミウムが海洋に大量に供給されたと考えられる.また主要微量元素濃度分析の結果,酸化還元状態に鋭敏な元素(V, U)は,ユリアン末に異常濃集が認められたことから,Wrangellia LIP火山活動の最盛期と同時に海洋無酸素環境がパンサラッサ海遠洋域でも広く発達していたことが明らかとなった.また,化石層序の検討から,ユリアン末からユリアン/チュバリアン境界にかけて海洋無酸素環境の発達に伴い,深海に生息していたことが知られる<i>Gladigondolella</i>属を含めたユリアンに特徴的なコノドントの絶滅が起こっていたことが明らかとなった.一方で,放散虫はユリアン/チュバリアン境界を通じて,ユリアンにおいて産出する種数の減少が見られたものの,チュバリアンを示す放散虫の多様性はユリアン/チュバリアン境界後に劇的に増加していることがわかった.この結果はパンサラッサ海に生息する放散虫は海洋無酸素環境の影響をさほど受けなかったことを示している.また,多様化が起こった原因として,パンゲア大陸の湿潤化および温暖化に伴い化学風化が強まったことにより,海洋への栄養塩が増加したことが考えられる.海洋無酸素化と選択的なコノドントや放散虫の絶滅との関係を明らかにするためには,パンサラッサ海遠洋域におけるカーニアンのコノドントや放散虫の生息環境(水深や水温など)を理解するためのさらなる研究が必要である. 【引用文献】Dal Corso, J. et al. 2015, Carbon isotope records reveal synchronicity between carbon cycle perturbation and the “Carnian Pluvial Event” in the Tethys realm (Late Triassic). <i>Glob. Planet. Chang.</i> 127, 79–90.Dal Corso, J. et al. 2020, Extinction and dawn of the modern world in the Carnian (Late Triassic). <i>Sci. Adv.</i> 6, 1–13.Simms, M.J., Ruffell, A.H., 1989, Synchroneity of climatic change and extinctions in the Late Triassic. <i>Geology</i> 17, 265–268.</p>

    DOI: 10.14863/geosocabst.2023.0_162

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  • A new method for extracting radiolarians and conodonts from bedded chert

    Onoue Tetsuji, Tomimatsu Yuki, Hori Sakiko, Rigo Manuel

    Annual Meeting of the Geological Society of Japan   2023 ( 0 )   166   2023   ISSN:13483935 eISSN:21876665

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    <p>中・古生代の時代決定に重要な放散虫は,ケイ酸質な骨格をもつ海生動物プランクトンであり,石英を主体とした硬く緻密な堆積岩である層状チャート中に含まれる.層状チャートからの放散虫化石の抽出には,従来フッ化水素酸(HF)を用いた処理法(林, 1968)が用いられてきた.放散虫と同様に,コノドントも5〜15%HF溶液を用いて層状チャートから抽出されてきた(林, 1969).しかし,HF溶液は,どのような濃度であっても毒物に指定されるため,処理は必ず高排気量のドラフト内で行う必要があり,薬品上・健康上の問題も多い.そこで本研究では,HF溶液を用いる方法より,安全且つ効率的に放散虫・コノドント化石を層状チャート中から抽出する方法について検討を進めた.シリカは高pH溶液に高い溶解性を示すことが知られている. 例えば,水酸化ナトリウム(NaOH)溶液は, 珪藻土や放散虫軟泥中の生物源オパールの溶解実験にしばしば利用されてきた.一方,珪酸塩鉱物を用いた実験からは,NaOH溶液による溶解反応は,室温ではほとんど進行しないことが示されている(Choquette et al., 1991).しかし,石英に対するNaOH溶液の溶解度は,温度の上昇とともに著しく増加する.そのため本研究では,NaOH水溶液を用いて層状チャートの溶解実験および微化石の抽出実験を行った.本研究では,美濃帯犬山地域の三畳紀およびジュラ紀の赤色層状チャートを用いて溶解実験を行った.実験に用いる粉末試料は4.0 g, 溶液は40 mlに統一し,濃度は 1-4 mol/L,温度は 60-100℃,時間は 1-5時間という条件で進めた.これらの条件で溶解実験を行った後,中和・乾燥を経て,残さ試料の電子顕微鏡(SEM)観察,質量の測定,X 線回析分析(XRD), 蛍光X 線分析(XRF)を行い,NaOH 溶液が層状チャート試料に与える影響を調べた.減量測定の結果からは,NaOH水溶液の濃度が高く,温度が高いほど,溶解後のチャートの減少量は大きいことが明らかになった.特に100℃で加熱した場合は,どの濃度でも減少量が大きかったのに対し,80℃や60℃では,濃度に関わらず減少量が少なかった.XRDやXRF分析の結果からは,NaOHは粘土鉱物(イライト等)よりも石英を効果的に溶解していることが明らかになった.また本研究では,1 mol/lの低濃度であっても,保存状態の良好な放散虫やコノドント化石を層状チャートから抽出することができた(Rigo et al., in press).1 mol/lのNaOH溶液は,劇物にも指定されないため取り扱いが容易である.また低コストでもあることから,従来のHF 溶液を用いた方法よりも安全で効率的な微化石抽出法であると結論づけられる.<b>引用文献</b><b></b>Choquette, M., Berube, M.-A., Locat, J., 1991. Behavior of common rock-forming minerals in a strongly basic NaOH solution. The Canadian Mineralogist 29, 163-173; 林信悟, 1968, 栃木県葛生町のあど山層から産出したコノドントについて.地球科学,22, 63-77; 林信悟, 1969. HF法によるコノドントの抽出. 化石研究会会誌, 2, 1-9; Rigo, M., Onoue, T., Wu, Q., Tomimatsu, Y., Santello, L., Du, Y., Jin, X., Bertinelli, A. 2023. A new method for extracting conodonts and radiolarians from chert with NaOH solution. Palaeontology, in press.</p>

    DOI: 10.14863/geosocabst.2023.0_166

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  • Extreme continental weathering in the northwestern Tethys during the end-Triassic mass extinction

    Tetsuji Onoue, Jozef Michalík, Hideko Shirozu, Misa Yamashita, Katsuyuki Yamashita, Soichiro Kusaka, Katsuhito Soda

    Palaeogeography, Palaeoclimatology, Palaeoecology   594   110934 - 110934   2022.5   ISSN:0031-0182 eISSN:1872-616X

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    The end-Triassic mass extinction (ETE) is thought to have been triggered by widespread eruption and emissions of volcanic and contact metamorphic carbon and sulfur gases from the Central Atlantic Magmatic Province (CAMP) flood basalts. Although palynological studies of shallow marine deposits in the basins of Denmark and Germany suggest that deforestation and catastrophic soil loss occurred during the CAMP volcanism and ETE interval, the intensity and timing of continental weathering in the region of northwestern Tethys Ocean remain unclear. Here we present Sr, C, and O isotope data, as well as multivariate statistical analyses of major element contents, for carbonate–clastic deposits in the Kardolína section, Slovakia, to develop a continental weathering record in the NW Tethys during the ETE event. This section consists of a shallow marine carbonate sequence in the Rhaetian Fatra Formation and the overlying Hettangian Kopieniec Formation. The Fatra Formation represents ramp facies deposits that formed in a restricted pull-apart basin of the Fatric Zone along the southern margin of the Bohemian Massif in the region of northwestern Tethys. Carbon isotope analysis of the limestones revealed two negative carbon isotope excursions (NCIEs) in the uppermost Fatra Formation. These two NCIEs occurred in the latest Rhaetian and can be compared to the “precursor” and “initial” NCIEs reported for the northwestern Tethys. Strontium isotope analysis of the limestones revealed an abrupt increase in Sr isotope ratios between the precursor and initial NCIEs, which indicates that continental weathering of the Bohemian Massif increased rapidly in the latest Rhaetian. Multivariate analysis of major element contents in the carbonate rocks also shows that intense chemical weathering of the hinterland was accelerated after the precursor NCIE, supporting the inferences drawn from Sr isotopes. Furthermore, our study reveals that the carbonate depositional environments of the Fatra Formation changed to the formation of specific Fe-rich oolites with increased continental weathering after the precursor NCIE. The concentrations of redox-sensitive major elements (e.g., Mn and Fe) and multivariate analysis of the major element data suggest that the Fe-rich oolites were formed by an influx of O-depleted water into the shallow water depositional environment of the Fatra Formation. A possible origin for this O-depleted water is the oxygen minimum zone (OMZ) that formed at intermediate water depths in European basins (e.g., the German and Eiberg basins) during the latest Rhaetian. Our results suggest that the marine environment in the European basins may have developed an OMZ due to the increase in continental weathering during the latest Rhaetian, and these environmental changes may have had an important role in the marine ETE event.

    DOI: 10.1016/j.palaeo.2022.110934

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  • Conodont and radiolarian biostratigraphic age constraints on Carnian (Upper Triassic) chert-hosted stratiform manganese deposits from Panthalassa: Formation of deep-sea mineral resources during the Carnian pluvial episode

    Yuki Tomimatsu, Tetsuji Onoue, Manuel Rigo

    Marine Micropaleontology   171   2022.3   ISSN:0377-8398 eISSN:1872-6186

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    Numerous stratiform manganese deposits occur in the Permian to Jurassic bedded chert successions of the Jurassic accretionary complexes of the Chichibu, Mino–Tamba, and North Kitakami belts in Japan. These accretionary complexes consist of deep-sea sediments accumulated in a pelagic, open-ocean setting within the Panthalassa Ocean. Although the depositional ages and processes of the Permian and Jurassic manganese deposits in these accretionary complexes have been studied, the Triassic bedded chert-hosted stratiform manganese deposits are poorly understood. We investigated the occurrence and stratigraphic distribution of Triassic stratiform manganese deposits in Japan, constraining their ages by means of integrated conodont–radiolarian biostratigraphy. On the basis of the conodont and radiolarian biostratigraphies, the depositional age of the Triassic manganese deposits was constrained to the latest Julian to earliest Tuvalian (mid-Carnian). This age indicates that the formation of the Triassic manganese deposits occurred contemporaneously with the last eruptive phase of the Wrangellia Large Igneous Province (LIP) volcanism and subsequent changes in the deep-sea redox conditions in the Panthalassa Ocean during the Carnian pluvial episode (CPE). Therefore, these manganese deposits may have been formed with the hydrothermal activity associated with the eruption of the Wrangellia LIP and/or the subsequent changes in marine redox conditions in the CPE.

    DOI: 10.1016/j.marmicro.2021.102084

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  • Terrestrial record of carbon-isotope shifts across the Norian/Rhaetian boundary: A high-resolution study from northwestern Sichuan Basin, South China

    Xin Jin, James G. Ogg, Song Lu, Zhiqiang Shi, David B. Kemp, Xia Hua, Tetsuji Onoue, Manuel Rigo

    Global and Planetary Change   210   2022.3   ISSN:0921-8181 eISSN:1872-6364

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    A series of biotic crises and turnovers have been recorded at the Norian/Rhaetian boundary (NRB), together with a putative perturbation to the global carbon cycle in the form of one or more negative carbon-isotope shifts. Despite this evidence, the full validation of Norian/Rhaetian climate changes has not been possible. In particular, no clear record of Norian/Rhaetian environmental change has yet been recovered from a terrestrial setting. The eruption of the Angayucham Large Igneous Province has been considered as a possible cause for the putative NRB negative carbon-isotope shifts. Hg as a volcanism proxy has been well-studied in many ancient marine and terrestrial sediments, but to date no Hg record has been obtained across the NRB. In this study, we focus on a terrestrial Norian-Rhaetian section (Xujiahe section) located north of Guangyuan in the northwestern Sichuan Basin, which has been correlated to the NRB using cyclostratigraphy and magnetostratigraphy. A long-lived negative trend in δ13Corg, superimposed with four negative shifts, is recognized across the NRB interval. This can be correlated to the uppermost part of the third negative δ13Corg shift (named S3) recognized in profiles from marine sites in Europe. Contemporaneous Hg concentration, Hg/Al and Hg/TOC anomalies in the Xujiahe section were possibly caused by large-scale volcanic activity. The large amplitude changes in δ13Corg (ca. −5.2‰) that we observe are suggested to be associated with local wildfire and enhanced coarse sediment input, indicating a significant environmental change during the NRB interval. Similar paleoclimatic perturbations have been noted across other extinction events (e.g., end-Permian mass extinction event) as a result of the emplacement of large igneous provinces, or because of felsic volcanism.

    DOI: 10.1016/j.gloplacha.2022.103754

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  • Integrated radiolarian and conodont biostratigraphy across the Triassic-Jurassic boundary in the Mino Belt, Inuyama area, central Japan

    Tomimatsu Yuki, Onoue Tetsuji, Rigo Manuel

    Annual Meeting of the Geological Society of Japan   2022 ( 0 )   91   2022   ISSN:13483935 eISSN:21876665

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    Language:Japanese   Publisher:The Geological Society of Japan  

    DOI: 10.14863/geosocabst.2022.0_91

    CiNii Research

  • Stratigraphy and sedimentary environment of the Upper Jurassic-Lower Cretaceous in Kurosegawa Belt (Hinagu Belt), in the south part of Kumamoto prefecture

    KAWAKAMI Kohei, ONOUE Tetsuji

    Annual Meeting of the Geological Society of Japan   2022 ( 0 )   274   2022   ISSN:13483935 eISSN:21876665

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    DOI: 10.14863/geosocabst.2022.0_274

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  • Chrolonological study of drilled cores from active hydrothermal fields in the Okinawa Trough

    Ishibashi Jun―ichiro, Itatani Yushi, Onoue Tetsuji, Okazaki Yusuke, Tomita Makiko, Toyoda Shin, Arai Kazuno

    Abstracts of Annual Meeting of the Geochemical Society of Japan   69 ( 0 )   94   2022

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    Language:Japanese   Publisher:GEOCHEMICAL SOCIETY OF JAPAN  

    <p>Among sediment cores collected from Ieyama hydrothermal field in the Okinawa Trough, mineralization layers with occurrence of barite and sphalerite were identified between 53-65 mbsf. We have conducted chronological study of barite in the sediment using <sup>226</sup>Ra‐<sup>210</sup>Pb dating and ESR dating. The results yielded 20-90 yrs. and 350-1050 yrs. as formation ages. On the other hand, radiocarbon dating of planktic foraminifera in the surface sediment at 0.15-0.20 mbsf collected from three places in the study field yielded 900‐1500 yrs.There results provide constraint on mineralization process that occurred beneath the seafloor.</p>

    DOI: 10.14862/geochemproc.69.0_94

    CiNii Research

  • Reconstruction of paleoceanographic changes in the pelagic deep-sea realms of the Panthalassa during the Carnian pluvial episode (Late Triassic)

    SODA Katsuhito, ONOUE Tetsuji

    Annual Meeting of the Geological Society of Japan   2022 ( 0 )   88   2022   ISSN:13483935 eISSN:21876665

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    DOI: 10.14863/geosocabst.2022.0_88

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  • Geochemistry of the Upper Triassic basalts of the Sambosan Belt, Kyushu and Shikoku, and their relationship with Wrangellia LIP magmatism

    Kandabashi Tomonari, Yamashita Katsuyuki, Kawakami Kohei, Onoue Tetsuji

    Annual Meeting of the Geological Society of Japan   2022 ( 0 )   87   2022   ISSN:13483935 eISSN:21876665

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    DOI: 10.14863/geosocabst.2022.0_87

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  • Temporal variations in extraterrestrial <sup>3</sup>He flux across the Permian/Triassic boundary: Toward a cross-disciplinary approach in earth and planetary sciences

    Onoue Tetsuji, Takahata Naoto, Soda Katsuhito, Sano Yuji, Isozaki Yukio

    Annual Meeting of the Geological Society of Japan   2022 ( 0 )   20   2022   ISSN:13483935 eISSN:21876665

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    DOI: 10.14863/geosocabst.2022.0_20

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  • Highly siderophile elements and Re–Os isotopes across the Norian/Rhaetian boundary in southern Italy

    Sato Honami, Ishikawa Akira, Tomimatsu Yuki, Onoue Tetsuji, Rigo Manuel

    Annual Meeting of the Geological Society of Japan   2022 ( 0 )   89   2022   ISSN:13483935 eISSN:21876665

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    Language:Japanese   Publisher:The Geological Society of Japan  

    DOI: 10.14863/geosocabst.2022.0_89

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  • イタリア北部ドロミテ山塊の上部三畳系に記録された2度の湿潤化イベント Reviewed

    尾上 哲治, マニュエル リゴ

    堆積学研究   77   2 - 2   2018.6

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Books

  • 大量絶滅はなぜ起きるのか : 生命を脅かす地球の異変

    尾上 哲治( Role: Sole author)

    講談社ブルーバックス  2023.9 

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    Responsible for pages:総ページ数:254p   Language:Japanese   Book type:General book, introductory book for general audience

  • 古生物学の百科事典

    尾上哲治( Role: Joint author)

    丸善出版  2023.2 

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    Language:Japanese  

  • 地球・惑星・生命

    尾上 哲治( Role: Joint author)

    東京大学出版会  2020.6 

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    Responsible for pages:280   Language:Japanese   Book type:Scholarly book

  • ダイナソー・ブルース 恐竜絶滅の謎と科学者たちの戦い

    尾上哲治( Role: Sole author)

    閑人堂  2020.2 

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    Responsible for pages:312 p.   Language:Japanese   Book type:General book, introductory book for general audience

  • 新しい地球惑星科学 分担執筆 応用編13章 日本列島の形成と進化

    尾上哲治

    培風館  2019.2 

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    Responsible for pages:239-246   Language:Japanese   Book type:Scholarly book

  • 地球全史スーパー年表

    清川昌一, 伊藤孝, 池原実, @尾上哲治( Role: Joint author)

    岩波書店  2014.4 

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    Language:Japanese  

  • 日本地方地質誌 (8) 九州地方 分担執筆

    佐野弘好, @尾上哲治( Role: Joint author)

    朝倉書店  2010.4 

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    Language:Japanese  

  • 大項目事典「地球」 ブリタニカ国際百科事典

    @尾上哲治( Role: Sole author)

    ブリタニカジャパン(株)  2009.4 

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  • 大量絶滅はなぜ起きるのか : 生命を脅かす地球の異変

    尾上, 哲治

    講談社  2023.9    ISBN:9784065333952

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    Total pages:254p   Language:Japanese  

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  • 大量絶滅はなぜ起きるのか : 生命を脅かす地球の異変

    尾上 哲治

    講談社  2023    ISBN:9784065333952

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    Language:Japanese  

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Presentations

  • 美濃帯中部三畳系層状チャートにおける放散虫・コノドント化石層序と化学層序

    塩原 拓真, 尾上 哲治, 曽田 勝仁

    日本地質学会  2023.4 

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    Event date: 2024.9 - 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • ペルム紀-三畳紀における地球外³He流入量の復元

    瀨戸山 功平, 高畑 直人, 尾上 哲治, 塩原 拓真, 佐野 有司, 磯崎 行雄

    日本地質学会  2023.4 

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    Event date: 2024.9 - 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 層状チャートを対象とした新しい放散虫・コノドント化石抽出法

    尾上 哲治, 冨松 由希, 堀 早紀子, リゴ マニュエル

    日本地質学会  2023.4 

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    Event date: 2024.9 - 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 美濃帯犬山地域のノーリアン/レーティアン境界(後期三畳紀)におけるコノドント・放散虫化石層序

    大島 温志, 尾上 哲治, 冨松 由希, Rigo Manuel

    日本地質学会  2023.4 

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    Event date: 2024.9 - 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Linkage between Carnian Pluvial Episode and Wrangellia-Sambosan LIP International conference

    Tetsuji Onoue, Tomonari Kandabashi, Katsuyuki Yamashita

    4th International Congress on Stratigraphy  2023.7 

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    Event date: 2023.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:France  

  • Middle Triassic radiolarian biostratigraphy and chemostratigraphy in the bedded chert sequence from the Jurassic accretionary complex of Japan. International conference

    Takuma Shiohara, Tetsuji Onoue

    4th International Congress on Stratigraphy  2023.7 

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    Event date: 2023.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:France  

  • Biostratigraphic revision of extinction patterns of radiolarians and conodonts across the Triassic-Jurassic boundary in the pelagic Panthalassa International conference

    Yuki Tomimatsu, Tetsuji Onoue, Manuel Rigo

    4th International Congress on Stratigraphy  2023.7 

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    Event date: 2023.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:France  

  • ペルム紀/三畳紀境界における地球外3He流入量の変動: 地球科学と惑星科学の境界領域開拓を目指して Invited

    尾上哲治、高畑直人、曽田勝仁、佐野有司、磯崎行雄

    日本地質学会学術大会  2022.9 

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    Event date: 2023.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:早稲田大学   Country:Japan  

  • Highly siderophile elements and Os isotope stratigraphy across the Norian/Rhaetian boundary in the Lagonegro Basin, southern Italy International conference

    Honami Sato, Akira Ishikawa, Yuki Tomimatsu, Tetsuji Onoue, Manuel Rigo

    2022 Goldschmidt Conference  2022.7 

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    Event date: 2023.6

    Language:English  

    Country:United States  

  • Paleoenvironmental reconstruction based on the revised continuous stratigraphy across the Triassic-Jurassic boundary in the Mino Belt, central Japan International conference

    Katsuhito Soda, Yuki Tomimatsu, Tetsuji Onoue, Minoru Ikehara

    2022 Goldschmidt Conference  2022.7 

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    Event date: 2023.6

    Language:English  

    Country:United States  

  • Biotic extinction at the Norian/Rhaetian boundary (Upper Triassic): geochemical and isotope evidence of a previously unrecognised global event International conference

    Manuel Rigo, Tetsuji Onoue, Honami Sato, Yuki Tomimatsu, Katsuhito Soda, Linda Godfrey, Miriam Katz, Hamish J Campbell, Lydia Tackett, Martyn Golding, Jerry Lei, Jon Husson, Matteo Maron, Sara Satolli, Mariachiara Zaffani, Giuseppe Concheri, Angela Bertinelli, Marco Chiari, Lawrence Tanner

    2022 Goldschmidt Conference  2022.7 

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    Event date: 2023.6

    Language:English  

    Country:United States  

  • Enhanced continental weathering in the NW Tethys during the end-Triassic mass extinction International conference

    Tetsuji Onoue, Jozef Michalik, Hideko Shirozu, Misa Yamashita, Katsuyuki Yamashita, Soichiro Kusaka, Katsuhito Soda

    2022 Goldschmidt Conference  2022.7 

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    Event date: 2023.6

    Language:English  

    Country:United States  

  • 熊本県南部黒瀬川帯(日奈久帯)の上部ジュラ系~下部白亜系の層序と堆積環境

    川上 高平, 尾上 哲治

    日本地質学会学術大会  2022.9 

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    Event date: 2023.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:早稲田大学   Country:Japan  

  • 美濃帯犬山地域の三畳紀/ジュラ紀境界における放散虫-コノドント化石層序

    冨松 由希, 尾上 哲治, Rigo Manuel

    日本地質学会学術大会  2022.9 

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    Event date: 2023.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:早稲田大学   Country:Japan  

  • 九州~四国に分布する三宝山帯上部三畳系玄武岩の地球化学的特徴とWrangellia LIPとの関連

    神田橋 知成, 山下 勝行, 川上 高平, 尾上 哲治

    日本地質学会学術大会  2022.9 

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    Event date: 2023.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:早稲田大学   Country:Japan  

  • Enhanced continental weathering in western Tethys during the end-Triassic mass extinction International conference

    Italian geologica sociiety  2022.9 

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    Event date: 2023.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Hungary  

  • Biotic extinction at the Norian/Rhaetian boundary (Upper Triassic): geochemical and isotope evidence of a previously unrecognised global event International conference

    Rigo M., @Onoue T., Sato H., Tomimatsu Y., Soda K., Godfrey L., Katz M., Campbell H., Tackett L., Golding M., Lei J., Husson J., Maron M., Satolli S., Zaffani M., Concheri G., Bertinelli A., Chiari M. & Tanner L.

    Italian geologica sociiety  2022.9 

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    Event date: 2023.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Hungary  

  • Radiolarian biostratigraphy and recovery from ocean anoxic event during Early -Middle Triassic: Chichibu Belt, Japan International conference

    Konan suwazono, Yuki Tomimatsu, Shun Muto, Tetsuji Onoue

    16th InterRad  2022.9 

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    Event date: 2023.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • High-resolution radiolarian and conodont biostratigraphy of the Upper Triassic and across the Triassic-Jurassic boundary in the Inuyama area, central Japan International conference

    Yuki Tomimatsu, Tetsuji Onoue, Manuel Rigo

    16th InterRad  2022.9 

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    Event date: 2023.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Radiolarian responses to the Norian “chaotic carbon episode” in the Panthalassa International conference

    2022.9 

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    Event date: 2023.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • イタリア南部の後期三畳紀ノーリアン/レーティアン境界における強親鉄性元素およびオスミウム同位体比変動

    佐藤峰南、石川晃、冨松由希、尾上哲治、Rigo Manuel

    日本地質学会学術大会  2022.9 

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    Event date: 2023.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:早稲田大学   Country:Japan  

  • 美濃帯中部三畳系層状チャートにおける放散虫・コノドント化石層序の再検討

    塩原 拓真、尾上 哲治

    日本地球惑星科学連合大会  2023.5 

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    Event date: 2023.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 後期三畳紀の絶滅事変:最近の研究動向 Invited

    尾上 哲治、Rigo Manuel

    日本地球惑星科学連合大会  2023.5 

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    Event date: 2023.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 東インド洋 深海掘削計画 第22次航海 サイト213の放散虫生層序

    小島 陸、岡崎 裕典、尾上 哲治

    日本地球惑星科学連合大会  2023.5 

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    Event date: 2023.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 三畳紀­-ジュラ紀境界における放散虫・コノドント化石群集の絶滅・変遷の再検討 Invited

    冨松 由希、尾上 哲治、Rigo Manuel

    日本地球惑星科学連合大会  2023.5 

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    Event date: 2023.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • ペルム紀・三畳紀における地球外3He流入量の変動

    尾上 哲治、瀬戸山 功平、塩原 拓真、高畑 直人

    日本地球惑星科学連合大会  2023.5 

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    Event date: 2023.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 美濃帯の下部三畳系−下部ジュラ系遠洋深海堆積岩を用いた古環境解析

    曽田 勝仁、尾上 哲治、安川 和孝

    日本地球惑星科学連合大会  2023.5 

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    Event date: 2023.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Rock Magnetism as a Tool to Understand the Paleoclimate at the Norian/Rhaetian Boundary: The Example of the Pignola-Abriola Section (Italy) International conference

    M Maron, S Satolli, @T Onoue, H Sato, K Soda, G Muttoni, M Rigo

    AGU Fall Meeting  2021.12 

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    Event date: 2021.12

    Language:English  

    Country:United States  

  • 美濃帯における三畳紀/ジュラ紀境界層の再検討

    曽田 勝仁、冨松 由希、山下 大輔、@尾上 哲治、池原 実

    日本地質学会  2021.9 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  • 後期三畳紀カーニアン湿潤化イベント時におけるオスミウム同位体組成から復元された大規模火山活動

    冨松 由希、野崎 達生、佐藤 峰南、高谷 雄太郎、木村 純一、常 青、@奈良岡 浩、@尾上 哲治

    日本地質学会  2021.9 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  • テチス海北西部における大陸風化の増加と三畳紀末大量絶滅

    @尾上 哲治、Michalík Jozef、白水 秀子、山下 勝行、山下 美沙、川上 高平、日下 宗一郎、曽田 勝仁

    日本地質学会  2021.9 

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    Event date: 2021.9

    Language:Japanese  

    Venue:オンライン   Country:Japan  

  • Ventilation of the deep ocean 2.2 billion years ago: Evidence from the Birimian Greenstone Belt, Ghana International conference

    KE Yamaguchi, M Ikehara, S Kiyokawa, T Ito, @T Onoue

    Goldschmidt2021  2021.7 

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    Event date: 2021.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Other  

  • パンサラサ海遠洋性層状チャートに記録されたカーニアン“湿潤期”における海水オスミウム同位体変動

    冨松 由希,野崎 達生,佐藤 峰南,高谷 雄太郎,木村 純一,常 青,奈良岡 浩,Manuel Rigo,尾上 哲治

    日本地球惑星科学連合  2020.5 

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    Event date: 2020.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  • Upper Triassic (Rhaetian) conodont biostratigraphy of the Panthalassa Ocean and the final extinction of conodonts at the end-Triassic

    2020.5 

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    Event date: 2020.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 沖縄トラフ熱水域の掘削コア試料を用いた年代学研究

    石橋 純一郎, 板谷 優志, 尾上 哲治, 岡崎 裕典, 冨田 麻起子, 豊田 新, 新井 和乃

    日本地球化学会  2022.9 

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    Event date: 2023.6

    Language:Japanese  

    Country:Japan  

  • 南鳥島東方沖に分布するMn団塊の記載およびOs層序年代

    野崎 達生、後藤 孝介、高谷 雄太郎、島田 和彦、大和田 朗、下田 玄、木村 純一、常 青、尾上 哲治、町田 嗣樹、石井 輝秋、清水 健二、平野 直人

    日本地球惑星科学連合大会  2022.5 

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    Event date: 2023.6

    Language:Japanese  

    Country:Japan  

  • 中部沖縄トラフ伊江山熱水域で産する粘土鉱物・硫酸塩鉱物の解析に基づく海底下堆積物中における熱水・海水混合の考察

    板谷 優志、石橋 純一郎、新城 竜一、山中 寿朗、岡崎 裕典、尾上 哲治

    日本地球惑星科学連合大会  2022.5 

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    Event date: 2023.6

    Language:Japanese  

    Country:Japan  

  • Extreme continental weathering in the northwestern Tethys during the Triassic–Jurassic transition

    尾上 哲治、Michalík Jozef、白水 秀子、山下 美沙、山下 勝行、日下 宗一郎、曽田 勝仁

    日本地球惑星科学連合大会  2022.5 

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    Event date: 2023.6

    Language:Japanese  

    Country:Japan  

  • 美濃帯の三畳紀/ジュラ紀境界における連続層序の改訂と古環境復元

    曽田 勝仁、冨松 由希、尾上 哲治、池原 実

    日本地球惑星科学連合大会  2022.5 

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    Event date: 2023.6

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    Country:Japan  

  • パンサラッサ海遠洋域で形成した上部三畳系層状マンガン鉱床のコノドントー放散虫化石層序による年代制約 Invited

    冨松 由希、尾上 哲治、Rigo Manuel

    日本地球惑星科学連合大会  2022.5 

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    Event date: 2023.6

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    Country:Japan  

  • Geochemistry of the Upper Triassic basalts of the Sambosan Belt, Kyushu and Shikoku, and their relationship with Wrangellia LIP magmatism

    2022.5 

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    Event date: 2023.6

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  • 大分県東部秩父帯の層状チャートを用いた 前期~中期三畳紀の海洋酸化還元状態の復元

    諏訪園 胡楠、冨松 由希、武藤 俊、尾上 哲治

    日本地球惑星科学連合大会  2022.5 

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    Event date: 2023.6

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  • A new method for extracting radiolarians and conodonts from bedded chert

    Onoue Tetsuji, Tomimatsu Yuki, Hori Sakiko, Rigo Manuel

    Annual Meeting of the Geological Society of Japan  2023  The Geological Society of Japan

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    Event date: 2023

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    中・古生代の時代決定に重要な放散虫は,ケイ酸質な骨格をもつ海生動物プランクトンであり,石英を主体とした硬く緻密な堆積岩である層状チャート中に含まれる.層状チャートからの放散虫化石の抽出には,従来フッ化水素酸(HF)を用いた処理法(林, 1968)が用いられてきた.放散虫と同様に,コノドントも5〜15%HF溶液を用いて層状チャートから抽出されてきた(林, 1969).しかし,HF溶液は,どのような濃度であっても毒物に指定されるため,処理は必ず高排気量のドラフト内で行う必要があり,薬品上・健康上の問題も多い.そこで本研究では,HF溶液を用いる方法より,安全且つ効率的に放散虫・コノドント化石を層状チャート中から抽出する方法について検討を進めた.シリカは高pH溶液に高い溶解性を示すことが知られている. 例えば,水酸化ナトリウム(NaOH)溶液は, 珪藻土や放散虫軟泥中の生物源オパールの溶解実験にしばしば利用されてきた.一方,珪酸塩鉱物を用いた実験からは,NaOH溶液による溶解反応は,室温ではほとんど進行しないことが示されている(Choquette et al., 1991).しかし,石英に対するNaOH溶液の溶解度は,温度の上昇とともに著しく増加する.そのため本研究では,NaOH水溶液を用いて層状チャートの溶解実験および微化石の抽出実験を行った.本研究では,美濃帯犬山地域の三畳紀およびジュラ紀の赤色層状チャートを用いて溶解実験を行った.実験に用いる粉末試料は4.0 g, 溶液は40 mlに統一し,濃度は 1-4 mol/L,温度は 60-100℃,時間は 1-5時間という条件で進めた.これらの条件で溶解実験を行った後,中和・乾燥を経て,残さ試料の電子顕微鏡(SEM)観察,質量の測定,X 線回析分析(XRD), 蛍光X 線分析(XRF)を行い,NaOH 溶液が層状チャート試料に与える影響を調べた.減量測定の結果からは,NaOH水溶液の濃度が高く,温度が高いほど,溶解後のチャートの減少量は大きいことが明らかになった.特に100℃で加熱した場合は,どの濃度でも減少量が大きかったのに対し,80℃や60℃では,濃度に関わらず減少量が少なかった.XRDやXRF分析の結果からは,NaOHは粘土鉱物(イライト等)よりも石英を効果的に溶解していることが明らかになった.また本研究では,1 mol/lの低濃度であっても,保存状態の良好な放散虫やコノドント化石を層状チャートから抽出することができた(Rigo et al., in press).1 mol/lのNaOH溶液は,劇物にも指定されないため取り扱いが容易である.また低コストでもあることから,従来のHF 溶液を用いた方法よりも安全で効率的な微化石抽出法であると結論づけられる.<b>引用文献</b><b></b>Choquette, M., Berube, M.-A., Locat, J., 1991. Behavior of common rock-forming minerals in a strongly basic NaOH solution. The Canadian Mineralogist 29, 163-173; 林信悟, 1968, 栃木県葛生町のあど山層から産出したコノドントについて.地球科学,22, 63-77; 林信悟, 1969. HF法によるコノドントの抽出. 化石研究会会誌, 2, 1-9; Rigo, M., Onoue, T., Wu, Q., Tomimatsu, Y., Santello, L., Du, Y., Jin, X., Bertinelli, A. 2023. A new method for extracting conodonts and radiolarians from chert with NaOH solution. Palaeontology, in press.

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  • (entry) Conodont and radiolarian biostratigraphy at the Norian/Rhaetian boundary (Late Triassic) in the Inuyama area, Mino Belt, central Japan

    OSHIMA Atsushi, ONOUE Tetsuji, TOMIMATSU Yuki, RIGO Manuel

    Annual Meeting of the Geological Society of Japan  2023  The Geological Society of Japan

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    後期三畳紀レーティアンは,中央大西洋火成岩岩石区(CAMP)における大規模火山活動が引き金となって発生した三畳紀末大量絶滅に先行して,段階的な生物の絶滅が起こった時代として知られている.後期三畳紀ノーリアン/レーティアン境界では,炭素同位体比の負異常に伴い,代表的な海生生物(例えば,放散虫やコノドント,アンモナイト)の絶滅および種数の減少が報告されてきた.このうち,炭素同位体比の負の異常は,当時のパンサラッサ海を超えてパンゲア大陸の東西両側及び,北半球,南半球の両方で記録されており,世界的な炭素循環の変動が起こったと考えられている(Rigo et al., 2020).これらの後期三畳紀レーティアンの段階的な生物絶滅や環境変動は,当時のパンサラッサ海遠洋域で堆積した深海堆積物である日本のジュラ紀付加体中の層状チャートにも記録されていると推測される.しかし,ジュラ紀付加体中の層状チャートは主に放散虫化石層序に基づいて年代決定がなされており,大陸縁辺での層序復元に用いられる国際標準のアンモナイトやコノドント化石層序との対比が十分に行われていない.そのため,層状チャートと他地域のノーリアン/レーティアン境界付近における地質記録の厳密な対比を行うことは難しいという問題がある.そこで本研究では,岐阜県犬山地域に露出する美濃帯上部三畳系ノーリアン〜レーティアン層状チャートから産出したコノドントおよび放散虫化石を報告し,ノーリアン/レーティアン境界の層準および指標となる化石種(コノドント,放散虫)を確定することを目的としてコノドント・放散虫統合化石層序の構築を行った.研究では,岐阜県坂祝町の木曽川右岸露頭から採取したチャート試料(22試料)について微化石処理を行い,放散虫およびコノドント化石を抽出した.得られた放散虫・コノドント化石については,Sugiyama (1997)の放散虫化石帯およびRigo et al. (2018)のコノドント化石帯に従って,コノドント・放散虫統合化石層序の作成と年代決定を行った. 研究の結果,検討セクションからSkirtFや<i>Praemesosaturnalis heilongjiangensis</i>,<i>Livarella densiporata</i>などの中期〜後期ノーリアン,前期レーティアンを示す放散虫化石9属21種が産出した.これまで後期ノーリアンの指標種とされてきた<i>Betraccium deweveri</i>は,検討セクションを通じて産出が確認された.またコノドントについては,後期ノーリアン後期を示す<i>Parvigondorella andrusovi</i>や<i>Misikella hernsteini</i>など2属5種が同定された.検討セクション最上部の<i>B. deweveri</i>最終産出層準付近では,<i>Misikella hernsteini</i>とレーティアンの基底に対比される<i>Misikalla posthernsteini</i>の中間的な形態を持つ種(<i>M. posthernsteini </i>s.l.)の産出が認められた.<i>M. posthernsteini </i>s.l. は本来記載された<i>M. posthernsteini</i>(便宜上<i>M. posthernsteini </i>s.s. とする)とは異なる特徴を有しており,<i>M. hernsteini</i>から<i>M. posthernsteini</i> s.s.へと形態が変化する段階のものであると考えられている(Caruthers et al., 2021).このことから,<i>M. posthernsteini</i> s.s.の初産出によって特徴付けられるノーリアン/レーティアン境界は,<i>B. deweveri</i>最終産出層準よりさらに上位に位置することが明らかとなった.本セクションのノーリアン/レーティアン境界のより正確な層準を決定するにあたり,<i>M. hernsteini </i>から<i>M. posthernsteini </i>s.l. および<i>M. posthernsteini</i> s.s.への進化的変化の過程について,層位分布,放散虫化石群集の変化と合わせて今後さらなる検討が必要である.引用文献:Rigo, M. et al., 2020, <i>Earth-Science Reviews,</i> 204, 103180. Rigo, M. et al., 2018, <i>The Late Triassic World,</i> Topics in Geobiology, 46, 189-235. Sugiyama, K, 1997, <i>Mizunami Fossil Mus</i>, 24, 79-193. Caruthers, A.H. et al., 2021, <i>Earth and Planetary Science Letters,</i> 577, 117262.

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  • (entry) Middle Triassic radiolarian and conodont biostratigraphy and chemostratigraphy in the bedded chert of the Mino Belt

    SHIOHARA Takuma, ONOUE Tetsuji, SODA Katsuhito

    Annual Meeting of the Geological Society of Japan  2023  The Geological Society of Japan

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    三畳紀の気候は総じて乾燥から半乾燥の時代と考えられているが, 中期三畳紀の後期アニシアン(ペルソニアン)と後期ラディニアン(ロンゴバルディアン)では,それぞれ湿潤化イベントの存在が知られている. これら2回の湿潤化イベントの原因は不明であるが, これらが放散虫やコノドントといった中期三畳紀の主要な遠洋性・外洋性生物の多様化につながった可能性が示唆されている.そこで本研究では, 中期三畳紀の湿潤化イベントに対する放散虫およびコノドントの群集組成の変化を調べるために, 岐阜県坂祝町に分布する美濃帯の中部三畳系層状チャート(セクションO:Sugiyama, 1997)を対象に放散虫, コノドント化石層序と化学層序を検討した.セクションOの層状チャートは,パンサラッサ海赤道域の深海底堆積物と考えられている.セクション全体の層厚は,約21 mである.採取した試料は,層状チャートの珪質部(チャート)65試料と,頁岩部の43試料である.化学層序については,頁岩部の試料を用いて蛍光X線分析(XRF)を行い,主要・微量元素濃度について測定した. 本研究の結果,セクションOからはTR-2C帯(<i>Triassocampe deweveri</i>帯)からTR-5A帯(<i>Capnuchosphaera</i>帯)までの6つの放散虫化石帯が認められた.これらの放散虫化石帯が示す年代は,後期アニシアンから前期カーニアンに比較される.また, 前期ラディニアン(ファッサニアン)から後期ラディニアン(ロンゴバルディアン)にかけて,顕著な放散虫化石群集の変化が確認された.岩相層序からは,この放散虫群集の変化は, セクションOの基底から10.5 mに位置する厚い頁岩層(4 cm厚)付近で発生したと考えられる. この頁岩層を境にして, <i>Muelleritortis noblis</i>から<i>Muelleritortis cochleata</i>への棘(spine)の形態変化および,<i>Tritortis integrita</i>から<i>Tritortis kretaensis</i>への形態変化が特徴的にみられた。 化学層序を検討した結果, 調査区間では顕著な海洋酸化還元状態の変化は見られなかった.一方, コノドントや魚類などの海洋性脊椎動物に由来すると考えられる生物起源アパタイトの濃度が, 前期ラディニアン/後期ラディニアン境界を越えて増加した. さらに, WやCIA(Chemical Index of Alteration)などの大陸風化指標(Nesbitt et al., 1982 ; Ohta et al., 2007)は, 後背地の化学風化が後期ラディニアンに強まったことを示唆する. 以上の結果は,後期ラディニアンの湿潤化イベントが,パンサラッサ海の海洋性脊椎動物の生産性の増加と放散虫の群集変化のきっかけとなった可能性を示唆する. 今後はそれらの因果関係について,詳細な検討を進める必要がある.引用文献 ・Nesbitt, H.W., Young, G.M., 1982,<i> Nature</i>, <b>299</b>, 715-717 ・Ohta, T., Arai, H., 2007, <i>Chemical Geology</i>, <b>240</b>, 280-297 ・Sugiyama, K., 1997, <i>Bulletin of the</i> <i>Mizunami Fossil Mus</i>., <b>24</b>, 79-193

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  • (entry) Temporal variations in extraterrestrial <sup>3</sup>He flux in the Permian and Triassic

    SETOYAMA Kohei, TAKAHATA Naoto, ONOUE Tetsuji, SHIOHARA Takuma, SANO Yuji, ISOZAKI Yukio

    Annual Meeting of the Geological Society of Japan  2023  The Geological Society of Japan

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    地球表層に降下する宇宙塵の総量は, 年間2700±1400トンから16000±9100トンと見積もられており,地表 1 m<sup>2</sup>あたりにもたらされる宇宙塵は年平均 0.05 mg 以下とごく少量である.しかし,大洋域の深海底で堆積した遠洋性堆積物は,大陸起源の粗粒砕屑物の流入がほとんどなく,堆積速度が非常に遅いため,他の堆積物に比べ地球外物質が濃集しやすい.そのため,遠洋性堆積物から地球外物質流入量の変動を調べることによって,小惑星帯での衝突イベントや惑星間空間に分布する塵の増減を復元できると考えられている.また,地球外物質は地球物質に比べ高いHe同位体比(<sup>3</sup>He/<sup>4</sup>He比)を持つことが知られており,深海堆積物中の³He濃度は白亜紀以降の地球への地球外物質の流入量を復元することに利用されている.しかし,ジュラ紀以前の深海底堆積物は,現在の深海底にほとんど存在しないことから,ヘリウム同位体(<sup>3</sup>He, <sup>4</sup>He)を用いたジュラ紀以前の地球外物質流入量の記録は復元されていない. そこで本研究では,後期ペルム紀から三畳紀を対象に,ヘリウム同位体を用いて,地球外物質流入量の変動記録解読を試みた.研究対象は,美濃帯(岐阜県舟伏山地域,犬山地域)および秩父帯(大分県津久見地域)の上部ペルム系〜上部三畳系遠洋性堆積岩である層状チャートである.ヘリウム同位体分析は,東京大学大気海洋研究所の希ガス用質量分析計を用いて行った. 測定の結果,バルク分析で得られた<sup>3</sup>He濃度は,ペルム紀キャピタニアンからチャンシンジアンにかけて増加する傾向がみられた.また,ウーチャーピンジアンの最前期とチャンシンジアン最後期において,<sup>3</sup>He濃度の短期間の上昇がみられた.ペルム紀/三畳紀境界より上位層では,<sup>3</sup>He濃度は急激に低下した.<sup> 3</sup>He/<sup>4</sup>He比は,0.3〜0.8 Raの値をとり,全体としては検討セクションの下部から上部に向かって緩やかに低下する傾向がみられた.また本研究では,中期三畳紀のアニシアン後期とラディニアン後期において,地球外³Heの流入量が増加したことが明らかになった. 検討したセクションの堆積速度に基づいて地球外<sup>3</sup>Heフラックスを計算すると,ペルム紀ウーチャーピンジアン最前期,チャンシンジアン最後期,中期三畳紀アニシアン後期,ラディニアン後期において,<sup>3</sup>Heフラックスが約4〜7倍増加したことが明らかになった.この結果は,小惑星帯における大規模な衝突や長周期彗星の増加などによって,これらの時期に惑星間空間に分布する塵が増加した可能性を示唆している.またこれら4度の地球外<sup>3</sup>Heフラックス増加は,主要な海退が起こった時期と一致する.そのため,オルドビス紀のL-コンドライト母天体崩壊イベント(約466Ma; Schmitz et al., 2019)で報告されているように,宇宙塵フラックス増加が,地球規模の寒冷化と大規模な海退を引き起こした可能性がある.引用文献:Schmitz, B. et al., 2019. An extraterrestrial trigger for the mid-Ordovician ice age: Dust from the breakup of the L-chondrite parent body. Sci Adv 5, eaax4184.

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  • Subseafloor thermal gradient revealed by isotope geothermometry of clay mineral

    Jun―ichiro Ishibashi, Yushi Itatani, Tetsuji Onoue, Kevin Faure

    Abstracts of Annual Meeting of the Geochemical Society of Japan  2023  GEOCHEMICAL SOCIETY OF JAPAN

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    We conducted oxygen and hydrogen isotope measurements of clay mineral in a sediment core obtained from an active hydrothermal filed in the Okinawa Trough, in order to estimate subseafloor thermal gradient based on isotope geothermometry. We found very steep thermal gradient up to 20 degree/meter at the upper most layer of the altered zone.

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  • Highly siderophile elements and Re–Os isotopes across the Norian/Rhaetian boundary in southern Italy

    Sato Honami, Ishikawa Akira, Tomimatsu Yuki, Onoue Tetsuji, Rigo Manuel

    Annual Meeting of the Geological Society of Japan  2022  The Geological Society of Japan

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    Event date: 2022

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  • Integrated radiolarian and conodont biostratigraphy across the Triassic-Jurassic boundary in the Mino Belt, Inuyama area, central Japan

    Tomimatsu Yuki, Onoue Tetsuji, Rigo Manuel

    Annual Meeting of the Geological Society of Japan  2022  The Geological Society of Japan

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  • Stratigraphy and sedimentary environment of the Upper Jurassic-Lower Cretaceous in Kurosegawa Belt (Hinagu Belt), in the south part of Kumamoto prefecture

    KAWAKAMI Kohei, ONOUE Tetsuji

    Annual Meeting of the Geological Society of Japan  2022  The Geological Society of Japan

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  • Chrolonological study of drilled cores from active hydrothermal fields in the Okinawa Trough

    Ishibashi Jun―ichiro, Itatani Yushi, Onoue Tetsuji, Okazaki Yusuke, Tomita Makiko, Toyoda Shin, Arai Kazuno

    Abstracts of Annual Meeting of the Geochemical Society of Japan  2022  GEOCHEMICAL SOCIETY OF JAPAN

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    Among sediment cores collected from Ieyama hydrothermal field in the Okinawa Trough, mineralization layers with occurrence of barite and sphalerite were identified between 53-65 mbsf. We have conducted chronological study of barite in the sediment using <sup>226</sup>Ra‐<sup>210</sup>Pb dating and ESR dating. The results yielded 20-90 yrs. and 350-1050 yrs. as formation ages. On the other hand, radiocarbon dating of planktic foraminifera in the surface sediment at 0.15-0.20 mbsf collected from three places in the study field yielded 900‐1500 yrs.There results provide constraint on mineralization process that occurred beneath the seafloor.

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  • Reconstruction of paleoceanographic changes in the pelagic deep-sea realms of the Panthalassa during the Carnian pluvial episode (Late Triassic)

    SODA Katsuhito, ONOUE Tetsuji

    Annual Meeting of the Geological Society of Japan  2022  The Geological Society of Japan

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    Language:Japanese  

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  • Geochemistry of the Upper Triassic basalts of the Sambosan Belt, Kyushu and Shikoku, and their relationship with Wrangellia LIP magmatism

    Kandabashi Tomonari, Yamashita Katsuyuki, Kawakami Kohei, Onoue Tetsuji

    Annual Meeting of the Geological Society of Japan  2022  The Geological Society of Japan

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    Event date: 2022

    Language:Japanese  

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  • Temporal variations in extraterrestrial <sup>3</sup>He flux across the Permian/Triassic boundary: Toward a cross-disciplinary approach in earth and planetary sciences

    Onoue Tetsuji, Takahata Naoto, Soda Katsuhito, Sano Yuji, Isozaki Yukio

    Annual Meeting of the Geological Society of Japan  2022  The Geological Society of Japan

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    Event date: 2022

    Language:Japanese  

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  • Extraterrestrial impact recorded in the Upper Triassic deep-sea deposits from Japan

    Sato H., Nozaki T. , Ishikawa A., Onoue T., Kimura J.-I., Chang Q., Suzuki K.

    Large Meteorite Impacts aand Planetaary Evolution VI  2019.10 

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    Event date: 2019.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:Brazil  

  • Enhanced flux of extraterrestrial 3He across the Permian-Triassic boundary in pelagic deep-sea chert

    Onoue T., Takahata N., Sato H., Ishikawa A., Soda K., Sano Y., Isozaki Y.

    Large Meteorite Impacts aand Planetaary Evolution VI  2019.10 

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    Event date: 2019.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:Brazil  

  • ペルム紀末大量絶滅と地球外 Heフラックスの増加イベント

    尾上哲治,高畑直人,佐藤峰南,石川 晃,曽田勝仁,佐野有司,磯_行雄

    日本地質学会  2019.9 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:山口大学   Country:Japan  

  • パンサラサ海遠洋域における後期三畳紀カーニアンに形成した 層準規制型マンガン鉱床の形成環境

    冨松由希,尾上哲治, 山下大輔,野崎達生,高谷雄太郎

    日本地質学会  2019.9 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:山口大学   Country:Japan  

  • ガーナの陸上掘削堆積岩の地球化学から示唆される約22億年前 の深海の酸化

    山口耕生,葉山煕大,小沼 一元,阿部剛,山口飛鳥,池原実,清川昌一,伊藤孝,尾上哲治,テテ ジョー ジ,ナイム フランク

    日本地質学会  2019.9 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:山口大学   Country:Japan  

  • The asynchronous extinction of conodonts: new constraints from Triassic-Jurassic boundary sections

    Du Y.X., Rigo M., P_lfy J., Kar_di V., Onoue T., Tomimatsu Y., Chiari M., Roghi G.

    International Congress on Stratigraphy STRATI 2019  2019.7 

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    Event date: 2019.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Italy  

  • Environmental conditions for the bivalve Halobia austriaca at the Carnian/Norian boundary

    Onoue T., Tripodo A., Rigo M.

    International Congress on Stratigraphy STRATI 2019  2019.7 

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    Event date: 2019.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Italy  

  • Birth and death of Upper Triassic seamounts in the Panthalassa Ocean: Ladinian?-Carnian to Rhaetian sedimentary records at Mount Sambosan, Shikoku, Southwest Japan

    Peybernes C., Peyrotty G., Chablais J., Onoue T., Yamashita D., Martini R.

    International Congress on Stratigraphy STRATI 2019  2019.7 

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    Event date: 2019.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Italy  

  • Re-Os isotope and PGE signatures of the deep-sea deposits from Japanese accretionary complex: implications for the Late Triassic impact event

    Sato H., Nozaki T., Ishikawa A., Onoue T., Kimura J.-I., Chang Q., Suzuki K.

    International Congress on Stratigraphy STRATI 2019  2019.7 

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    Event date: 2019.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Italy  

  • Upper Norian to Rhaetian conodont biostratigraphy of the Panthalassic Ocean and the final extinction of conodonts at the end-Triassic

    Yamasaki K., Tomimatsu Y., Onoue T., Rigo M.

    International Congress on Stratigraphy STRATI 2019  2019.7 

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    Event date: 2019.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Italy  

  • The evolutionary process from Mockina bidentata to the genus Parvigondolella: the evidences from Pizzo Mondello Section

    Du Y.X., Rigo M., Onoue T., Williams I.

    International Congress on Stratigraphy STRATI 2019  2019.7 

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    Event date: 2019.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Italy  

  • Enhanced flux of extraterrestrial 3He across the Permian–Triassic boundary Invited

    日本地球惑星科学連合  2019.5 

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    Event date: 2019.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:幕張メッセ   Country:Japan  

  • 美濃帯坂祝セクションの層状チャートから解読した三畳紀海水Os同位体比変動 Invited

    野崎達生,二階堂崇,尾上哲治,高谷雄太郎,佐藤佳子,木村純一,常青,山下大輔,佐藤峰南,鈴木勝彦,加藤泰浩,松岡篤

    日本地球惑星科学連合  2019.5 

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    Event date: 2019.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:幕張メッセ   Country:Japan  

  • パンサラッサ遠洋域深海堆積岩における中部三畳系アニシアン統のコノドント生層序―放散虫化石帯との統合―

    武藤俊,高橋聡,山北聡,曽田勝仁,尾上哲治

    日本地球惑星科学連合  2019.5 

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    Event date: 2019.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:幕張メッセ   Country:Japan  

  • パンサラサ海遠洋域における後期三畳紀カーニアン湿潤化イベントにより形成された層状マンガン鉱床

    冨松由希,尾上哲治,山下大輔,野崎達生,高谷雄太郎

    日本地球惑星科学連合  2019.5 

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    Event date: 2019.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:幕張メッセ   Country:Japan  

  • Helium isotope variations in subduction-type volcanic hydrothermal systems

    2019.5 

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    Event date: 2019.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • パンサラサ海における後期三畳紀レーチアンのコノドント化石層序と三畳紀末コノドントの絶滅

    山_栞奈,山下大輔,尾上哲治

    日本地球惑星科学連合  2019.5 

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    Event date: 2019.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:幕張メッセ   Country:Japan  

  • 美濃帯遠洋性堆積岩のペルム紀/三畳紀境界に記録された古環境変動

    植村真也,尾上 哲治

    日本地球惑星科学連合  2019.5 

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    Event date: 2019.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:幕張メッセ   Country:Japan  

  • O-91 ブリティッシュコロンビア州南部ジェスモンドのカシェクリークコンプレックスの下部三畳系炭酸塩堆積物の堆積相(炭酸塩岩の起源と地球環境,口頭発表,一般講演)

    佐野 弘好, 尾上 哲治, Orchard M.J, Martini R

    日本地質学会学術大会講演要旨  2007.9 

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    Language:Japanese  

    Country:Other  

  • O-91 ブリティッシュコロンビア州南部ジェスモンドのカシェクリークコンプレックスの下部三畳系炭酸塩堆積物の堆積相(炭酸塩岩の起源と地球環境,口頭発表,一般講演)

    佐野 弘好, 尾上 哲治, Orchard M.J., Martini R.

    日本地質学会学術大会講演要旨  2007.9 

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    Language:Japanese  

    Country:Japan  

  • P-70 沖縄県辺戸岬,今帰仁層上部トリアス系石灰岩の層序と堆積相(13.炭酸塩岩の起源と地球環境,ポスター発表,一般講演)

    安田 知佳, 山口 真理子, 尾上 哲治

    日本地質学会学術大会講演要旨  2008.9 

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    Language:Japanese  

    Country:Other  

  • P-70 沖縄県辺戸岬,今帰仁層上部トリアス系石灰岩の層序と堆積相(13.炭酸塩岩の起源と地球環境,ポスター発表,一般講演)

    安田 知佳, 山口 真理子, 尾上 哲治

    日本地質学会学術大会講演要旨  2008.9 

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    Language:Japanese  

    Country:Japan  

  • P-128 熊本県五木村三宝山付加コンプレックスから産出する上部トリアス系二枚貝化石群集(21.古生物,ポスター発表,一般講演)

    山口 真理子, 尾上 哲治

    日本地質学会学術大会講演要旨  2008.9 

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    Language:Japanese  

    Country:Other  

  • P-128 熊本県五木村三宝山付加コンプレックスから産出する上部トリアス系二枚貝化石群集(21.古生物,ポスター発表,一般講演)

    山口 真理子, 尾上 哲治

    日本地質学会学術大会講演要旨  2008.9 

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    Language:Japanese  

    Country:Japan  

  • P-1 九州東部,秩父帯の中部トリアス系層状チャートから産する球粒宇宙塵(1.ジュラ系+,ポスター発表,一般講演)

    尾上 哲治, 安田 知佳

    日本地質学会学術大会講演要旨  2008.9 

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    Language:Japanese  

    Country:Other  

  • P-1 九州東部,秩父帯の中部トリアス系層状チャートから産する球粒宇宙塵(1.ジュラ系+,ポスター発表,一般講演)

    尾上 哲治, 安田 知佳

    日本地質学会学術大会講演要旨  2008.9 

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    Language:Japanese  

    Country:Japan  

  • 美濃帯の上部三畳系遠洋性堆積岩中に記録された天体衝突の証拠

    佐藤峰南, 尾上哲治, 中村智樹, 野口高明, 初川雄一, 大澤崇人, 小泉光生, 藤暢輔, 海老原充

    日本地質学会学術大会講演要旨  2011.9 

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    Language:Japanese  

    Country:Japan  

  • 三畳紀新世における天体衝突と絶滅事変

    尾上哲治, 佐藤峰南, 中村智樹, 野口高明, 初川雄一, 大澤崇人, 小泉光生, 藤暢輔, 海老原充

    日本地質学会学術大会講演要旨  2011.9 

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    Language:Japanese  

    Country:Japan  

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MISC

  • Linkage between Carnian Pluvial Episode and Wrangellia Large Igneous Province

    Yuki Tomimatsu, Honami Sato, Tomonari Kandabashi, Manuel Rigo, Tetsuji Onoue

    Large Igneous Province of the month   2022.9

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

    Other Link: http://www.largeigneousprovinces.org/LOM

Professional Memberships

  • 日本地質学会

  • 日本堆積学会

  • 日本古生物学会

  • アメリカ地質学会

Committee Memberships

  • Executive   Domestic

    2022.4 - 2024.3   

  • 日本地質学会   執行理事   Domestic

    2022.4 - 2024.3   

  • Executive   Domestic

    2020.4 - 2024.3   

  • 国際層序委員会   三畳紀部会 ワーキンググループ   Foreign country

    2019.2 - 2021.2   

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:4

    Number of peer-reviewed articles in Japanese journals:1

    Proceedings of International Conference Number of peer-reviewed papers:0

    Proceedings of domestic conference Number of peer-reviewed papers:0

  • 堆積学研究

    2022.4 - 2023.3

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    Type:Academic society, research group, etc. 

  • 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:2

    Number of peer-reviewed articles in Japanese journals:2

    Proceedings of International Conference Number of peer-reviewed papers:0

    Proceedings of domestic conference Number of peer-reviewed papers: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:3

    Number of peer-reviewed articles in Japanese journals:0

    Proceedings of International Conference Number of peer-reviewed papers:0

    Proceedings of domestic conference Number of peer-reviewed papers:0

  • 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:4

    Number of peer-reviewed articles in Japanese journals:0

    Proceedings of International Conference Number of peer-reviewed papers:0

    Proceedings of domestic conference Number of peer-reviewed papers:0

  • 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:4

    Number of peer-reviewed articles in Japanese journals:1

  • 地質学雑誌

    2017.4 - 2024.3

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    Type:Academic society, research group, etc. 

  • 堆積学研究

    2017.4 - 2021.3

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Research Projects

  • 顕生代における宇宙塵大量流入イベントと地球環境への影響

    Grant number:20H00203  2020 - 2024

    日本学術振興会  科学研究費助成事業  基盤研究(A)

    尾上 哲治, 佐藤 峰南, 山下 勝行, 高畑 直人, 曽田 勝仁

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    Authorship:Principal investigator  Grant type:Scientific research funding

    顕生代には地球への宇宙塵フラックス(流入量)が突発的に増加するイベントが知られており,それらと大量絶滅との関連性が指摘されている.しかし宇宙塵フラックス増加の原因や地球環境に与える影響については,ほとんど何もわかっていない.本研究では,顕生代における宇宙塵大量流入イベントの頻度や原因を高精度の同位体分析からつきとめ,その増加がどのような環境変動を引き起こしたのかを全岩化学組成の多変量解析から解明する.本研究を基礎として,宇宙塵フラックスの増減が,過去の地球環境や生命の歴史にどのような影響を与えてきたのかといった全く新しい研究展開が期待できる.

    CiNii Research

  • Revealing causes of Paleozoic mass extinctions

    Grant number:19H00711  2019.4 - 2023.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

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    Grant type:Scientific research funding

    CiNii Research

  • 古生代大量絶滅の原因解明:グローバル寒冷化と地球外フラックス

    2019 - 2023

    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

  • 溶融宇宙塵から復元する大気酸素同位体比と生物生産の変動

    2017 - 2019

    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:Principal investigator  Grant type:Scientific research funding

  • 海の鉱物資源の科学と工学の新展開

    2015 - 2019

    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

Class subject

  • 地球惑星科学実習Ⅰ

    2024.10 - 2025.3   Second semester

  • 堆積学B

    2024.6 - 2024.8   Summer quarter

  • 基礎地質学

    2024.4 - 2024.9   First semester

  • 地球変動史概論

    2024.4 - 2024.9   First semester

  • 堆積学 (H28以前入学者)

    2024.4 - 2024.9   First semester

  • 堆積学A

    2024.4 - 2024.6   Spring quarter

  • 基礎科学実習

    2023.12 - 2024.2   Winter quarter

  • 国際科学特論Ⅵ

    2023.12 - 2024.2   Winter quarter

  • 自然科学総合実験

    2023.10 - 2024.3   Second semester

  • 地球惑星科学実習Ⅰ

    2023.10 - 2024.3   Second semester

  • 堆積学B

    2023.6 - 2023.8   Summer quarter

  • 基礎地質学

    2023.4 - 2023.9   First semester

  • 地球史生物史演習

    2023.4 - 2023.9   First semester

  • 地球変動史概論

    2023.4 - 2023.9   First semester

  • 堆積学A

    2023.4 - 2023.6   Spring quarter

  • 国際科学特論Ⅵ

    2022.12 - 2023.2   Winter quarter

  • 地球惑星科学実習Ⅰ

    2022.10 - 2023.3   Second semester

  • 基幹教育セミナー

    2022.6 - 2022.8   Summer quarter

  • 堆積学B

    2022.6 - 2022.8   Summer quarter

  • 地球変動史概論

    2022.4 - 2022.9   First semester

  • 地球史生物史演習

    2022.4 - 2022.9   First semester

  • 基礎地質学

    2022.4 - 2022.9   First semester

  • 堆積学A

    2022.4 - 2022.6   Spring quarter

  • 国際科学特論Ⅵ

    2021.12 - 2022.2   Winter quarter

  • 基礎科学実習

    2021.12 - 2022.2   Winter quarter

  • 国際科学特論Ⅵ

    2021.12 - 2022.2   Winter quarter

  • 地球惑星科学実習Ⅰ

    2021.10 - 2022.3   Second semester

  • 地球惑星科学実習Ⅰ

    2021.10 - 2022.3   Second semester

  • 国際科学特論Ⅴ

    2021.10 - 2021.12   Fall quarter

  • 国際科学特論Ⅴ

    2021.10 - 2021.12   Fall quarter

  • 堆積学B

    2021.6 - 2021.8   Summer quarter

  • 堆積学B

    2021.6 - 2021.8   Summer quarter

  • 堆積学 (H28以前入学者)

    2021.4 - 2021.9   First semester

  • 地球史生物史演習

    2021.4 - 2021.9   First semester

  • 基礎地質学

    2021.4 - 2021.9   First semester

  • 堆積学 (H28以前入学者)

    2021.4 - 2021.9   First semester

  • 基礎地質学

    2021.4 - 2021.9   First semester

  • 堆積学A

    2021.4 - 2021.6   Spring quarter

  • 堆積学A

    2021.4 - 2021.6   Spring quarter

  • 国際科学特論Ⅵ

    2020.12 - 2021.2   Winter quarter

  • 国際科学特論Ⅵ

    2020.12 - 2021.2   Winter quarter

  • 自然科学総合実験

    2020.10 - 2021.3   Second semester

  • 地球惑星科学実習Ⅰ

    2020.10 - 2021.3   Second semester

  • 地球惑星科学演習ⅡA

    2020.10 - 2021.3   Second semester

  • 地球惑星科学演習ⅡB

    2020.10 - 2021.3   Second semester

  • 地球惑星科学演習Ⅱ(H28以前入学者)

    2020.10 - 2021.3   Second semester

  • 地球惑星科学演習Ⅱ(H28以前入学者)

    2020.10 - 2021.3   Second semester

  • 地球惑星科学演習IIA,B

    2020.10 - 2021.3   Second semester

  • 国際科学特論Ⅴ

    2020.10 - 2021.3   Second semester

  • 国際科学特論Ⅴ

    2020.10 - 2020.12   Fall quarter

  • 国際科学特論Ⅴ

    2020.10 - 2020.12   Fall quarter

  • 堆積学B

    2020.6 - 2020.8   Summer quarter

  • 基礎地質学

    2020.4 - 2020.9   First semester

  • 基礎地質学

    2020.4 - 2020.9   First semester

  • 地球惑星科学演習Ⅳ

    2020.4 - 2020.9   First semester

  • 地球変動史概論

    2020.4 - 2020.9   First semester

  • 地球史生物史演習

    2020.4 - 2020.9   First semester

  • 地球変動史概論

    2020.4 - 2020.9   First semester

  • 堆積学A,B

    2020.4 - 2020.9   First semester

  • 堆積学A

    2020.4 - 2020.6   Spring quarter

  • 自然科学総合実験

    2019.10 - 2020.3   Second semester

  • 国際科学特論ⅤI

    2019.10 - 2020.3   Second semester

  • フロンティア科学I

    2019.10 - 2020.3   Second semester

  • 地球惑星科学演習IIA,B

    2019.10 - 2020.3   Second semester

  • 国際科学特論Ⅴ

    2019.10 - 2020.3   Second semester

  • 堆積学B

    2019.6 - 2019.8   Summer quarter

  • 基礎地質学

    2019.4 - 2019.9   First semester

  • 基礎地質学

    2019.4 - 2019.9   First semester

  • 堆積学

    2019.4 - 2019.9   First semester

  • 地球変動史概論

    2019.4 - 2019.9   First semester

  • 堆積学A,B

    2019.4 - 2019.9   First semester

  • 堆積学A

    2019.4 - 2019.6   Spring quarter

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FD Participation

  • 2022.3   Role:Speech   Title:(地球惑星科学科FD)実験・実習科目の課題と今後のあり方

    Organizer:Undergraduate school department

  • 2020.12   Role:Participation   Title:新型コロナウィルス感染拡大状況での学生のメンタルヘルス

    Organizer:[Undergraduate school/graduate school/graduate faculty]

Visiting, concurrent, or part-time lecturers at other universities, institutions, etc.

  • 2020  東京大学理学系研究科  Classification:Part-time lecturer  Domestic/International Classification:Japan 

    Semester, Day Time or Duration:後期

  • 2019  熊本大学理学部  Classification:Part-time lecturer  Domestic/International Classification:Japan 

    Semester, Day Time or Duration:前期,後期

  • 2018  東北大学理学研究科  Classification:Part-time lecturer  Domestic/International Classification:Japan 

  • 2014  岡山大学自然科学研究科  Classification:Part-time lecturer  Domestic/International Classification:Japan 

  • 2014  新潟大学自然科学研究科  Classification:Part-time lecturer  Domestic/International Classification:Japan 

Outline of Social Contribution and International Cooperation activities

  • 研究成果の社会的発信のため,毎年度一般市民講演を行なっている(例えば,大分県津久見市). 学会活動においては,地質学会の代議員および堆積学会の編集委員を務めている.また国際層序委員会の三畳紀部会において,ノーリアン基底の国際標準模式層断面を選定するためのワーキンググループメンバーをつとめている.

Social Activities

  • 網代島からわかる恐竜誕生以前の地球の姿

    大分県立美術館  2022.12

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

    Type:Lecture

  • 「自然から学ぶ地球と人の歴史」第三回講座

    あまべ文化研究所  大分県津久見市  2019.10

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

    Type:Lecture

Media Coverage

  • TBSラジオ「コネクト」出演 TV or radio program

    TBSラジオ  2023.11

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    TBSラジオ「コネクト」出演

  • 著書の書評が読書欄に掲載 Newspaper, magazine

    西日本新聞  2023.10

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    著書の書評が読書欄に掲載

  • 著書の書評が読書欄に掲載 Newspaper, magazine

    朝日新聞朝刊  2023.10

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    著書の書評が読書欄に掲載

  • 「オピニオン」地学を学ぼう Newspaper, magazine

    西日本新聞  2023.3

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    「オピニオン」地学を学ぼう

  • NHK BS「コズミックフロント」において研究内容の紹介 TV or radio program

    2021.4

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    NHK BS「コズミックフロント」において研究内容の紹介

  • JSTの「サイエンスポータル」において公表論文に関する記事掲載

    JSTサイエンスポータル  2021.1

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    JSTの「サイエンスポータル」において公表論文に関する記事掲載

  • 著書と作者を紹介するインタビュー記事 Newspaper, magazine

    西日本新聞  2020.5

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    著書と作者を紹介するインタビュー記事

  • 著書の書評が読書欄に掲載 Newspaper, magazine

    朝日新聞朝刊  2020.5

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    著書の書評が読書欄に掲載

  • 2.5億年前,最大規模の生物絶滅 本巣の地層に証拠 Newspaper, magazine

    西日本新聞, 岐阜新聞ほか全国各紙  2019.5

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    2.5億年前,最大規模の生物絶滅 本巣の地層に証拠

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