Submarine sediment distribution and its controlling factors around the Tokara Islands

DOI Web Site 5 Citations 21 References
  • SUZUKI Yoshiaki
    AIST, Geological Survey of Japan, Research Institute of Geology and Geoinformation
  • ITAKI Takuya
    AIST, Geological Survey of Japan, Research Institute of Geology and Geoinformation
  • KATAYAMA Hajime
    AIST, Geological Survey of Japan, Research Institute of Geology and Geoinformation
  • KANEKO Naotomo
    AIST, Geological Survey of Japan, Research Institute of Geology and Geoinformation
  • YAMASAKI Makoto
    Graduate School of International Resource Sciences, Akita University
  • ARIMOTO Jun
    AIST, Geological Survey of Japan, Research Institute of Geology and Geoinformation
  • TOKUDA Yuki
    Faculty of Environmental Studies, Tottori University of Environmental Studies,
  • SENTOKU Asuka
    Faculty of Science, University of the Ryukyus
  • SEIKE Koji
    AIST, Geological Survey of Japan, Research Institute of Geology and Geoinformation Graduate School of Frontier Sciences, The University of Tokyo

Bibliographic Information

Other Title
  • トカラ列島周辺海域の底質分布とその制御要因

Abstract

<p>Surface sediment sampling was conducted at 102 sites during two marine geological survey cruises (GB21-2 and GB21-3) around the Tokara Islands. Muddy sediments are generally distributed on the flat seafloor below 800 m depth, and are strongly bioturbated in many sites. The distribution of sandy sediments, gravels, and outcrops is not necessarily limited to shallow water depths, but coarsegrained materials of biogenic and non-biogenic sources were observed in and around islands as well as shallow water areas. This distribution of bottom sediments is believed to be influenced by the presence of submarine volcanoes which are a potential source of sediments beneath the seafloor, in addition to islands and shallow-water areas where biological production occurs. The distribution of bedforms such as ripples, outcrops, and gravelly sediments, commonly found around islands, suggests a strong influence of the meandering Kuroshio Current in this area. Analyses of bryozoans, coral distribution, assemblages, size distribution, and preservation of planktic foraminifera suggest that the Kuroshio Current exerts both mechanical effects, through bottom currents, and biological effects, such as on community composition and the body size of organisms, on the sediments.</p>

Journal

  • BULLETIN OF THE GEOLOGICAL SURVEY OF JAPAN

    BULLETIN OF THE GEOLOGICAL SURVEY OF JAPAN 74 (5-6), 259-286, 2023-12-28

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

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