δ13C records of diploptene in the Japan Sea sediments over the past 25 kyr

Keita Yamada, Ryoshi Ishiwatari, Kohei Matsumoto, Hiroshi Naraoka

研究成果: Contribution to journalArticle査読

20 被引用数 (Scopus)

抄録

Stable carbon isotopic compositions were determined for diploptene in the sediment core KH-79-3, L-3 (core length: 235 cm) taken from the Oki Ridge in the southern part of the Japan Sea. Two major groups of diploptene with different δ13C values were recognized. The first group appears in the 0-130 cm section (present to 10 kyr B.P.) of the core, the δ13C values being -25.0 ± 0.7‰ on average. Diploptene in this section should have originated from cyanobacteria. The second group which is strongly depleted in 13C (-53.1 ± 5.3‰ on average), is observed in the 145-204 cm section (12-21 kyr B.P.). Diploptene in this section might have originated from methanotrophic bacteria. This indicates that an anoxic bottom water condition was developed during 12-21 kyr B.P. (the last glacial period), which was perhaps caused by the development of seawater stratification in the Japan Sea.

本文言語英語
ページ(範囲)315-321
ページ数7
ジャーナルGEOCHEMICAL JOURNAL
31
5
DOI
出版ステータス出版済み - 1997
外部発表はい

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

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