2024-03-28T16:30:17Z
https://soar-ir.repo.nii.ac.jp/oai
oai:soar-ir.repo.nii.ac.jp:00020459
2022-12-14T03:46:08Z
1169:1170
Relationship between shelf sedimentation and climate changes in the upper Pliocene Dainenji Formation in Fukushima, northeastern Japan
福島県上部鮮新統大年寺層における陸棚の堆積作用と気候変動との関係
近藤, はるか
小佐野, 由布子
吉田, 真見子
保柳, 康一
柳沢, 幸夫
organic matter
climate change
shelf
Pliocene
Dainenji Formation
Pliocene Dainenji Formation is distributed in the Pacific Ocean side of the Fukushima Prefecture. The depositional age is from 4.18 to 2.6 Ma. We carried out facies analysis and geochemical analysis, such as total organic carbon (TOC), total sulfur (TS), and stable carbon isotope ratio of organic matter (δ13Corg). Our results are as follows : (1) Abundant land-derived organic matter was transported to the shelf and was preserved in the sediment in warm period (3.75-3.5 Ma), (2) Productivity of marine organism increased in the early cooling period (3.5-3.35 Ma), (3) The considerable variations in TS, TOC and δ13Corg are seen in cooling stage after 3 Ma, which succeeded to the Quaternary ice age. Theses considerable variation are shown in δ18O curve of the same age.
Article
堆積学研究. 64 : 77-81(2007)
journal article
日本堆積学会
2007-04-20
application/pdf
堆積学研究
64
77
81
1342-310X
AA11155966
https://soar-ir.repo.nii.ac.jp/record/20459/files/26400486_x1.pdf
jpn
10.4096/jssj.64.77
https://doi.org/10.4096/jssj.64.77
© 2007 The Sedimentological Society of Japan