日本海秋田沖の２本の海底コアの酸素・炭素・窒素同位体比に基づく古環境解析

DOI Web Site 被引用文献11件 参考文献22件
  • 奥村 智
    北海道大学大学院地球環境科学研究科
  • 南川 雅男
    北海道大学大学院地球環境科学研究科地球環境変遷学講座
  • 大場 忠道
    北海道大学大学院地球環境科学研究科地球環境変遷学講座
  • 池原 研
    工業技術院地質調査所海洋地質部

書誌事項

タイトル別名
  • Paleoenvironmental Analysis of Two Sediment Cores off Akita City in the Japan Sea Based on Oxygen, Carbon and Nitrogen Isotopes.
  • ニホンカイ アキタオキ ノ 2ホン ノ カイテイ コア ノ サンソ タンソ チ

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抄録

The paleoenvironmental changes in the Japan Sea over the past 32, 000 years were reconstructed from analyses of δ18O and δ13C in foraminiferal tests, concentrations of organic carbon and total nitrogen, C/N ratios, and their δ13C and δ15N in two cores, KI-5 and PC-9, recovered from the eastern part of the Japan Sea. The following results were obtained: (1) The lithology and δ18O curves of planktonic foraminifera in the two cores agree well with those of many cores in the Japan Sea. This suggests that the paleoenvironmental changes occurred over the entire Japan Sea. (2) The C/N ratios in the eastern cores are higher throughout than those in the southern cores, and the δ13C values are lower than those of the southern cores. This implies higher terrigenous inputs in the eastern core sites than in the southern core sites. (3) Each result for the seven analytical items mentioned above demonstrates fluctuation corresponding to the following paleoenvironmental changes in the Japan Sea: inflow of the surface water from the East China Sea from 32 to 29ka, development of low-salinity surface water from 29 to 15ka, inflow of the Oyashio Current from 15 to 10ka, inflow of the surface water in the East China Sea affected by the Kuroshio Current from 10 to 8ka, and inflow of the Tsushima Current since 8ka. In particular, the relationship between δ13C and δ15N of organic matter provides an important proxy for paleoceanographic reconstruction.

収録刊行物

  • 第四紀研究

    第四紀研究 35 (5), 349-358, 1996

    日本第四紀学会

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