| Title Transcription | ニイガタケン キタウラハラグン タイナイガワゾイ ニ ブンプスル センシントウ クワエソウ ノ コニホン カイヨウ カンキョウ ト ユウキ タンソ ノウド
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| Title Alternative (English) | Paleoceanography of the Japan Sea and organic carbon contents of the Pliocene Kuwae Formation along the Tainai River, Kitakanbara area, Niigata Prefecture, central Japan
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| File | |
| language |
jpn
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| Author |
Yamashita, Yasushi
Ishida, Katsura
Tanaka, Yuichiro
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| Description | Organic carbon contents and hydrocarbons of the Pliocene Kuwae Formation along the Tainai River, Kitakanbara area, Niigata Prefecture were investigated to reconstruct the paleoceanography of the Japan Sea. Between 2.5Ma and 3.5Ma, TOC (total organic carbon) contents changed between 0.3% and 1% with a small oscillation (range: 0.3%). In this period, the sea floor was anoxic, and the origin of the organic carbon was mainly marine plankton. The oscillation in TOC seems to correspond to the Milankovich short cycle (20-40ky). The TOC contents were high during warm periods. This could be due to upwelling activity and nutrient supply from land areas. TOC contents also show a long interval change. After 2.8Ma, decreased TOC suggests that primary productivity in the marine system decreased in the cold climate.
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| Journal Title |
島根大学地球資源環境学研究報告
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| Volume | 28
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| Start Page | 65
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| End Page | 72
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| ISSN | 13439774
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| Published Date | 2009-12-25
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| NCID | AA11455176
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| DOI（SelfDOI） | |
| Publisher | 島根大学総合理工学部地球資源環境学教室
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| Publisher Aalternative | Department of Geoscience, Interdisciplinary Faculty of Science and Engineering, Shimane University
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| NII Type |
Departmental Bulletin Paper
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| Format |
PDF
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| Text Version |
出版社版
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| Gyoseki ID | e9654
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| OAI-PMH Set |
Interdisciplinary Graduate School of Science and Engineering
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| Remark | 12-14,16+ / 1993+
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| 他の一覧 |
