IODP, Exp. 303航海で得られた北大西洋の中部第四系から産出した絶滅珪藻種 Neodenticula kamtschatica の意義  [in Japanese] Significance of Neodenticula kamtschatica, an extinct planktonic diatom species from the middle Quaternary submarine deposit, IODP Exp. 303, North Atlantic Ocean  [in Japanese]

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Author(s)

    • 佐藤 時幸 SATO Tokiyuki
    • 秋田大学工学資源学部地球資源学科 Department of Earth Science and Technology, Faculty of Engineering and Resources Science, Akita University
    • 工藤 美幸 [他] KUDO Miyuki
    • 秋田大学工学資源学部地球資源学科 Department of Earth Science and Technology, Faculty of Engineering and Resources Science, Akita University
    • 山崎 誠 YAMASAKI Makoto
    • 秋田大学工学資源学部地球資源学科 Department of Earth Science and Technology, Faculty of Engineering and Resources Science, Akita University

Abstract

<i>Neodenticula kamtschatica</i> (Zabelina) Akiba and Yanagisawa, an extinct late Neogene planktonic diatom has been very first observed in the middle Quaternary submarine deposit in the northeastern North Atlantic. The species has been considered for a long time to be limited within the high-to-middle latitudinal North Pacific. In the North Pacific region, this species appeared in the geologic record approx. at 6.4 Ma as “first common occurrence”, and became extinct at 2.65 Ma occurrence. On the other hand, no record of the Atlantic specimens has been presented. Thus, its fossil imprint in the North Atlantic of our investigation implies that at least single episode of the trans-ocean migration (=floral interchange of North Pacific and North Atlantic via the Arctic) of the species occurred during the latest Miocene through Pliocene epoch, considering the tectonic and hydrographic backgrounds such as the initial opening of the Bering Strait (5.5 Ma~) and the final closure of the Panamanian Isthmus (~2.76 Ma). Our evidence is significant to give a further insight on the relationship between the process to establish biogeography of planktonic micro-organisms and the paleoenvironmental change in the Northtern Hemisphere.

Journal

  • The Journal of the Geological Society of Japan

    The Journal of the Geological Society of Japan 114(1), 47-50, 2008-01-15

    The Geological Society of Japan

References:  20

Codes

  • NII Article ID (NAID)
    110006571427
  • NII NACSIS-CAT ID (NCID)
    AN00141768
  • Text Lang
    JPN
  • Article Type
    SHO
  • ISSN
    00167630
  • NDL Article ID
    9368369
  • NDL Source Classification
    ZM49(科学技術--地球科学--地質)
  • NDL Call No.
    Z15-174
  • Data Source
    CJP  NDL  NII-ELS  J-STAGE 
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