ダウンロード数 : ?
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
Title Alternative
Paleoceanography of the Japan Sea and organic carbon contents of the Pliocene Kuwae Formation along the Tainai River, Kitakanbara area, Niigata Prefecture, central Japan
File
language
jpn
Author
Yamashita, Yasushi
Ishida, Katsura
Tanaka, Yuichiro
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.
Journal Title
島根大学地球資源環境学研究報告
Volume
28
Start Page
65
End Page
72
ISSN
13439774
Published Date
2009-12-25
NCID
AA11455176
Publisher
島根大学総合理工学部地球資源環境学教室
Publisher Aalternative
Department of Geoscience, Interdisciplinary Faculty of Science and Engineering, Shimane University
NII Type
Departmental Bulletin Paper
OAI-PMH Set
Department of Geoscience, Interdisciplinary Graduate School of Science and Engineering
Remark
12-14,16+ / 1993+
このエントリーをはてなブックマークに追加