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2006 Fiscal Year Final Research Report Summary

Late Holocene paleoenvironmental analysis from submarine cave deposits

Research Project

Project/Area Number 16340159
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Stratigraphy/Paleontology
Research InstitutionShizuoka University

Principal Investigator

KITAMURA Akihisa  Shizuoka University, Institute of Geosciences Faculty of Science, Associate Professor, 理学部, 助教授 (20260581)

Co-Investigator(Kenkyū-buntansha) KASE Tomoki  National Science Museum, Division of Invertebrate Paleontolog, Chief, 地学研究部, 室長 (20124183)
SAKAI Hideo  Toyama University, Institute of Geosciences Faculty of Science, Professor, 理学部, 教授 (30134993)
FUJITA Kazuhiko  Ryukyu University, Institute of Geosciences Faculty of Science, Associate Professor, 理学部, 助手 (00343377)
Project Period (FY) 2004 – 2006
KeywordsHolocene / climate changes / marine environments / coral reef / submarine cave / Paleontology
Research Abstract

We examined a sediment layer and surface sediments in a submarine limestone cave (31 m depth) on the fore-reef slope of Ie Island, off Okinawa mainland, Japan. In addition, oxygen isotope analysis was performed on the cavernicolous micro-bivalve Carditella iejimensis from both cored sediments and surface sediments, and the water temperature within the cave was recorded for nearly one year. These data lead to the following conclusions : 1) although the biotic and non-biotic environments within the cave have persisted for the past 5,000 years, the environmental conditions of the innermost cave area gradually spread to the entrance of the cave ; 2) the alternation of water masses within the cave is caused by the tidal cycle ; 3) the δ^<18>O-derived temperature of C. iejimensis indicates spring temperature at 30 m deep outside the cave ; 4) the δ^<18>O-derived temperature of C. iejimensis from cored sediments implies that there were two warmer intervals, at about AD 280 and AD 1050 ; 5) a sediment layer containing pumice grains (BC 440 ± 40 to AD 640 ± 80) was identified and named as Daidokutsu pumice. These suggest that submarine-cave sediments and oxygen isotope records of cavernicolous shells are a useful tool to reconstruct century-scale paleoenvironmental and climatic variability for the subtropical Okinawa Islands during the Holocene.

  • Research Products

    (6 results)

All 2007 2006

All Journal Article (6 results)

  • [Journal Article] Potential of submarine-cave sediments and oxygen isotope composition of cavernicolous micro-bivalve as a late Holocene paleoenvironmental record2007

    • Author(s)
      Kitamura, Yamamoto, Kase ほか
    • Journal Title

      Global and Planetary Change 55

      Pages: 301-316

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Changes in cavernicolous bivalve assemblages and environments within a submarine cave in Okinawa Islands during the last 5,000 years2007

    • Author(s)
      Kitamura, Hiramoto, Kase ほか
    • Journal Title

      Paleontological Research 11・2

      Pages: 161-180

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Potential of submarine-cave sediments and oxygen isotope composition of cavernicolous micro-bivalve as a late Holocene paleoenvironmental record.2007

    • Author(s)
      Kitamura, A., et al.
    • Journal Title

      Global and Planetary Change vol. 55

      Pages: 301-316

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Changes in cavernicolous bivalve assemblages and environments within a submarine cave in Okinawa Islands during the last 5,000 years.2007

    • Author(s)
      Kitamura, A. et al.
    • Journal Title

      Paleontological Research vol. 11, no. 2

      Pages: 161-180

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] 沖縄県伊江島の海底洞窟堆積物から見つかった軽石散在層2006

    • Author(s)
      北村晃寿, 加瀬友喜ほか
    • Journal Title

      第四紀研究 45

      Pages: 141-144

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Discovery of sediment layer containing pumice grains in submarine cave sediment in coral reef of Okinawa Islands (in Japanese with English abstract).2006

    • Author(s)
      Kitamura, A., et al.
    • Journal Title

      The Quaternary Research (Daiyonki-Kenkyu) vol. 45

      Pages: 141-144

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2008-05-27  

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