| Project/Area Number |
06640634
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
地球化学
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| Research Institution | HOKKAIDO UNIVERSITY (1995)
Shimane University (1994) |
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Principal Investigator |
SUZUKI Noriyuki Hokkaido Univ., Graduate School of Sci., Associate Prof., 大学院理学研究科, 助教授 (00144692)
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| Co-Investigator(Kenkyū-buntansha) |
三瓶 良和 島根大学, 理学部, 講師 (00226086)
石賀 裕明 島根大学, 理学部, 助教授 (80183002)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1995: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1994: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Permian-Triassic boundary / Mesozoic / Biomarker / Black shale / Primary production / Mass extinction / Palaeocean / ダイノステラン / 赤潮 / 渦鞭毛藻 / P / T境界 |
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| Research Abstract |
Outcrops containing the Permian/Triassic (P/T) boundary exposed in the Tanba and Chichibu terranes, Southwest Japan, have intercalated organic rich black shales. The initial organic carbon concentration was evaluated to be about 3% (average), considering their maturity levels. Kerogens do not contain any debris of higher plant origins, but are mostly composed of structureless amorphous ones. Biomarkers show that black shales comprise organic matter derived mainly from plankton with the additional organic matter related tothe bacterial activity. Palaeocean at the time of black shale formation was comparatively active. The stratified ocean with well developed oxygen minimum layr rich in nutrients was intermittently destroyed due to the tectonically and climatically induced active ocean current systems in the P/T transition time, resulting in upwelling for the remarkably high primary production. Expanding oxygen minimum layr in the Late Permian and its abrupt destruction can be one of crucial causes for the mass extinction of marine invertebrates and their evolution.
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