堆積岩の化学組成及び同位体組成より推定した古日本海海洋環境 Paleoceanographic Environment of Japan Sea Deduced from Chemical and Isotopic Features of Miocene-Pliocene Sedimentary Rocks

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Chemical and isotopic analyses (Sr isotopic ratio, major element, trace element, rare earth element, total carbon, nitrogen, and sulfur contents) of rock samples collected from middle Miocene to early Pliocene sedimentary rocks, Oga Peninsula, northern Japan were performed to elucidate the paleoceanographic environment of Japan Sea. The rocks studied include shale from Nishikurosawa, Onnagawa, and Funakawa formations in stratigraphically ascending order. The Onnagawa sedimentary rocks in the lower (<I>ca</I>. 12.6-11.4 Ma), middle (<I>ca</I>. 10.5-9.0 Ma), and upper (<I>ca</I>. 8.3-7.0 Ma) horizons are characterized by high Mo/Al, P/Al, and Ba/Al ratios and total organic carbon content. Positive Eu anomaly, K/Ti ratio and <SUP>87</SUP>Sr/<SUP>86</SUP>Sr ratio are also high in the same horizons. These geochemical variations imply that high primary productivity, and reducing condition of deep paleoocean, and formation of petroleum source rocks were caused by an upwelling of deep seawater. The upwelling of deep seawater is considered to have been influenced by strong winds from the Asian continent, which was related to the uplift of Himalayan and Tibetan regions.

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  • 地學雜誌

    地學雜誌 112(4), 586-607, 2003-08-25

    公益社団法人 東京地学協会

参考文献:  77件中 1-77件 を表示

被引用文献:  3件中 1-3件 を表示

各種コード

  • NII論文ID(NAID)
    10013949717
  • NII書誌ID(NCID)
    AN00322536
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    0022135X
  • NDL 記事登録ID
    6689938
  • NDL 雑誌分類
    ZM41(科学技術--地球科学)
  • NDL 請求記号
    Z15-169
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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