サハリン第三系の珪質堆積岩と古第三紀/新第三紀境界期の古海洋環境 Tertiary Siliceous Sedimentary Rocks from Sakhalin, Russia and Palaeoceanographic Environment in the Paleogene/Neogene Transition Time

この論文にアクセスする

この論文をさがす

著者

抄録

Tertiary sedimentary sequences containing the Paleogene/Neogene boundary are well exposed in Sakhalin, Russia. Sequences of Oligocene to Miocene mudstones from Korsakov, Makarov, and Shmidt Peninsula areas were studied to reveal the palaeoceanographic environment at the time of the Paleogene/Neogene transition. Late Oligocene rocksare characterized by siliceous mudstones. The SiO<SUB>2</SUB> contents and total organic carbon concentra tions range from 70 to 95% and from 0.5 to 2.7%, respectively. Siliceous rocks from the Shmidt Peninsula are rich in organic carbon, and were deposited in an anoxic environment as indicated by the abundance of C<SUB>35</SUB> homohopane, and low C/S ratio. Open system pyrolysis and pyrolysis gas chromatography show that siliceous rocks from the Shmidt Peninsula are rich in typical marine Type II kerogen with hydrogen indices ranging from 250 to 400mgHC/gC. The siliceous rocks from the Makarov section are characterized by low hydrogen indices of less than 200mgHC/gC. Their maximum temperatures experienced during burial diagenesis are estimated to be less than 100°C based on silica mineral transformation and biomarker isomer ratios.<BR>Late Oligocene siliceous mudstones are rich in biomarkers derived from diatoms and dinoflagellates, showing enhanced primary productivity of the Late Oligocene ocean in the Sakhalin region. Invasion of nutrient-rich proto-AABW (Antarctic Bottom Water) and its upwelling might be responsible for the high primary production in the Late Oligocene. Benthic water in the Paleogene / Neogene transition was abruptly oxidized, which is attributable to a decline of proto-AABW. This palaeoceanographic event seems to be related to global warming in the Paleogene/Neogene transition.

収録刊行物

  • 地學雜誌  

    地學雜誌 109(2), 218-234, 2000-04-25 

    Tokyo Geographical Society

参考文献:  30件

参考文献を見るにはログインが必要です。ユーザIDをお持ちでない方は新規登録してください。

被引用文献:  3件

被引用文献を見るにはログインが必要です。ユーザIDをお持ちでない方は新規登録してください。

各種コード

  • NII論文ID(NAID)
    10004672161
  • 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
    5368620
  • 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 
ページトップへ