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A study on Transporting process of clastics under Kuroshio Extension.

Research Project

Project/Area Number 16540424
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Geology
Research InstitutionJapan Agency for Marine-Earth Science and Technology

Principal Investigator

KANAMATSU Toshiya  Independent Administrative Institution, Japan Agency for Marine-Earth Science and Technology, Institute for Research on Earth Evolution, Research Scientist, 地球内部変動研究センター, 研究員 (90344283)

Project Period (FY) 2004 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 2006: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2005: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2004: ¥500,000 (Direct Cost: ¥500,000)
KeywordsKuroshio Extension / Kuroshio path change / Glacial / Interglacial / relative paleointensity of geomagnetism / Rock-magnetism / magnetic grain size / 黒潮続流 / 大水深 / 磁気特性 / 相対地球磁場強度 / 親潮 / 粒度変化 / 岩石磁気パラメーター
Research Abstract

It is revealed that the rock-magnetic property of surface sediment under Kuroshio Extension is characterized by magnetite in magnetic mineralogy, and the high distribution in amount of magnetic mineral is recognized at 32-34゜N. In the condition which magnetic mineralogy is dominant in magnetite, the large magnetic grain size at 34-32゜N is observed, but the distal and southern sites involve the smaller magnetite. These spatial distributions of the grain size and amount of magnetite suggest that the clastic material of Izu-Ogasawara ridge, which including magnetic mineral, is spilled by the stream of Kuroshio Extension into the Northwest Pacific basin.
The spatial and temporal distribution of the sediment character in the study area show the distinction in the chemical and rock-magnetic property between glacial and interglacial periods. At the maxima in glacial period, the magnetite contribution to the sediment component is small, the bulk chemical component shows less in Al and rich n Si. These patterns suggest the small supply of clastics, probably because the stream pattern of Kuroshio Extension was different from the current situation. In the interglacial glacial periods, 34゜N core shows the smaller change in grain size, on the other side, cores in southern and proximal sites shows that the grain size have changes unsteadily. The interpretation of the changes is that 34゜N core have been in axial zone of the Kuroshio Extension in constant, but the others have been in the margin of the Kuroshio Extension, and been susceptive to the change of Kuroshio Extension.
The change of amount of magnetic mineral shows a high fluctuated pattern, and this pattern is very similar to the isotope data of the Greenland Ice-core.

Report

(4 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • 2004 Annual Research Report
  • Research Products

    (6 results)

All 2007 2006

All Journal Article (6 results)

  • [Journal Article] Relative Paleointensity Stack during the Last 250 kyr in the Northwest Pacific2007

    • Author(s)
      Y.Yamamoto, T.Yamazaki, T.Kanamatsu, N.loka, T.Mishima
    • Journal Title

      JOURNAL OF GEOPHYSICAL RESEARCH 112

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Relative Paleointensity Stack during the Last 250 kyr in the Northwest Pacific2007

    • Author(s)
      Y.Yamamoto, T.Yamazaki, T.Kanamatsu, N.Ioka, T.Mishima
    • Journal Title

      JOURNAL OF GEOPHYSICAL RESEARCH 112

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Relative Paleointensity Stack during the Last 250 kyr in the Northwest Pacific2007

    • Author(s)
      Y.Yamamoto, T.Yamazaki, T.Kanamatsu, N.Ioka, T.Mishima
    • Journal Title

      JOURNAL OF GEOPHYSICAL RESEARCH 112・B01104

    • Related Report
      2006 Annual Research Report
  • [Journal Article] 北西太平洋海底コアに記録される第四紀中・後期のテフラ層序 : 広域テフラとの対比と年代モデルの構築2006

    • Author(s)
      菅沼悠介, 青木かおり, 金松敏也, 山崎俊嗣
    • Journal Title

      第四紀研究 45

      Pages: 435-450

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Tephrostratigraphy of deep-sea sediments in the northwestern Pacific and implication for chronology of the past 300 kyr2006

    • Author(s)
      Y.Suganuma, K.Aoki, T.Kanamatsu, T.Yamazaki
    • Journal Title

      The Quaternary Res. (Dai-yonki Kenkyuu)(in Japanese with English abstract) 45

      Pages: 435-450

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 北太平洋海底コアに記録される第四紀中・後期のテフラ層序:広域テフラとの対比と年代モデルの構築2006

    • Author(s)
      菅沼悠介, 青木かおり, 金松敏也, 山崎俊嗣
    • Journal Title

      第四紀研究 45

      Pages: 435-450

    • Related Report
      2006 Annual Research Report

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Published: 2004-04-01   Modified: 2016-04-21  

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