1995 Fiscal Year Final Research Report Summary
Organic geochemical study on the relationship between primary productivity of palaeocean and evolution of marine invertebrates
| 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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| Project Period (FY) |
1994 – 1995
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| Keywords | Permian-Triassic boundary / Mesozoic / Biomarker / Black shale / Primary production / Mass extinction / Palaeocean |
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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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Research Products
(22 results)
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[Publications] Sampei, Y., Yomura, H, Otsuka, M., Yoshida, K., and Suzuki, N.: "Decomposition of organic matter and the organic carbon content of sediments in Lake Shinji, southwest Japan" Earth Sience (Chikyu Kagaku). 48. 143-158 (1994)
Description
「研究成果報告書概要(和文)」より
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[Publications] Kogane, N,Imaoka, T., Ueda, Y., Sampei, Y., and N.Suzuki: "Transgression of the Japan Sea in the Middle Miocene as shown by stratigraphic variations of total organic carbon and sulfur concentrations of mudstones near the boundary of Koura and Josoji Formations, eastern Shimane Peninsula, Japan.(in Japanese)" Geological Report of Shimane University. 13. 57-67 (1994)
Description
「研究成果報告書概要(欧文)」より
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[Publications] Sampei, Y., Yomura, H., Otsuka, M., Yoshida, K., and Suzuki, N.: "Decomposition of organic matterand the organic carbon content of sediments in Lake Shinji, southwest Japan." Earth Science(Chikyu Kagaku). 48. 143-158 (1994)
Description
「研究成果報告書概要(欧文)」より
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