Hydrogen and oxygen isotope compositions of bottom waters collected around off southwestern Tokara Islands

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  • OIKAWA Kazuma
    Department of Earth Science, Graduate School of Science, Tohoku University
  • MIYAJIMA Toshihiro
    Atmosphere and Ocean Research Institute, The University of Tokyo
  • TAKAYANAGI Hideko
    Department of Earth Science, Graduate School of Science, Tohoku University
  • IRYU Yasufumi
    Department of Earth Science, Graduate School of Science, Tohoku University

Bibliographic Information

Other Title
  • トカラ列島南西海域より採水した底層水の水素・酸素同位体組成

Description

<p>We analyzed hydrogen and oxygen isotope compositions (δD and 18O) of bottom water samples collected at depths of 248–1,169 m from 32 sites around the southwestern Tokara Islands during the GB21-1 cruise. The d-excess differs at the eastern margin of the Okinawa Trough and to the north of Takarajima Island from to the south to the east of off this island. The salinity–δ18O relationship varied within the study area and at different water depths. These results suggest that (1) the origin of water masses in the southwestern Tokara Islands differs from region to region, (2) that the origin of seawater is the same, but the mixing rate differs among regions, or (3) both.</p>

Journal

  • BULLETIN OF THE GEOLOGICAL SURVEY OF JAPAN

    BULLETIN OF THE GEOLOGICAL SURVEY OF JAPAN 74 (5-6), 329-336, 2023-12-28

    National Institute of Advanced Industrial Science and Technology, Geological Survey of Japan

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