| File | |
| Title |
新潟県北蒲原郡胎内川沿いに分布する鮮新統鍬江層の古日本海洋環境と有機炭素濃度
|
| Title |
Paleoceanography of the Japan Sea and organic carbon contents of the Pliocene Kuwae Formation along the Tainai River, Kitakanbara area, Niigata Prefecture, central Japan
|
| 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
|
| Creator |
Yamashita Yasushi
Ishida Katsura
Tanaka Yuichiro
|
| Source Title |
島根大学地球資源環境学研究報告
|
| Volume | 28 |
| Start Page | 65 |
| End Page | 72 |
| Journal Identifire |
ISSN 13439774
|
| Descriptions |
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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| Language |
jpn
|
| Resource Type | departmental bulletin paper |
| Publisher |
島根大学総合理工学部地球資源環境学教室
Department of Geoscience, Interdisciplinary Faculty of Science and Engineering, Shimane University
|
| Date of Issued | 2009-12-25 |
| Publish Type | Version of Record |
| Access Rights | open access |
| Relation |
[NCID] AA11455176
|
| Remark | 12-14,16+ / 1993+ |
