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Structure of Paleosecular Variation : Relation to the Core Dynamics

Research Project

Project/Area Number 13640424
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体地球物理学
Research InstitutionKochi University

Principal Investigator

TANAKA Hidefumi  Kochi University, Faculty of Education, Professor, 教育学部, 教授 (80108191)

Project Period (FY) 2001 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2003: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 2002: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 2001: ¥2,900,000 (Direct Cost: ¥2,900,000)
Keywordspaleosecular variation / paleointensity / geomagnetic excursion / Cretaceous Quiet Zone / Unzen Volcano / Ontake Volcano / basalt from Inner Mongolia / eccentric dipole / テリエ法 / 更新世 / 白亜紀 / 中国内モンゴル / 古地球磁場強度 / コアダイナミクス / 古地磁気 / 火山岩 / 小滝火砕流 / Bingham統計
Research Abstract

Experimental studies with a newly introduced thermal demagnetizer were made on many volcanic rocks from the Unzen Volcano and the Ontake Volcano, Japan. Angular standard deviation(ASD) of the paleosecular variation(PSV) in the Brunhes Chron obtained from Unzen was in the same level as those from other areas of Japan, but it was larger for Older Unzen than Younger Unzen. Paleomagnetic methods were also applied to some volcanostratigrphic problems ; estimation of emplacement temperature of pyroclastic flows and lava identifications. One of the most important results obtained from the paleomagnetic studies of the Ontake Volcano is the establishment of the geomagnetic excursions in the latest Pleistocene in Japan. Reliability of the excursions is very high because they were found from two andesite lava flows, in which stabilities of the remanences are much higher than those from sediments. Paleointensities obtained from one of the two lava flows are abut 1/10 of the present-day value, and the associated virtual geomagnetic poles(VGPs) locate near the central Pacific Ocean. As the VGP positions in the central Pacific were also reported from the Auckland excursion in New Zealand, it was proposed that the equatorial dipole moment becomes dominant during the excursion. To explain the structure of PSV, a new statistical model was developed, in which Gaussian fluctuation was given to an eccentric dipole. This simple model explains most of the structures of PSV ; latitude dependent ASD and the shape of the histograms of the paleointensities.

Report

(4 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] Tanaka, H., M.Kono: "Paleointensities from a Cretaceous basalt platform in Inner Mongolia, northeastern China"Phys.Earth Planet.Inter.. 133. 147-157 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Zheng, Z., H.Tanaka, Y.Tatsumi, M.Kono: "Basalt platforms in Inner Mongolia and Hebei Province, northeastern China : New K-Ar ages, geochemistries, and revision of paleomagnetic results"Geophys.J.Int.. 151. 654-662 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Herrero-Bervera, E., E.Canon-Tapia, G.P.L.Walker, H.Tanaka: "Magnetic fabrics study and inferred flow directions of lavas of the Old Pali Road, Oahu, Hawaii"J.Volcanol.Geotherm.Res.. 118. 161-171 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Tanaka, H., T.Kobayashi: "Paleomagnetism of the late Quaternary Ontake Volcano, Japan : directions, intensities, and excursions"Earth Planets Space. 55. 189-202 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Tanaka, H., M.Kono: "Paleointensities from a Cretaceous basalt platform in Inner Mongolia, northeastern China."Phys.Earth Planet.Inter.. 133. 147-157 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Zheng, Z., H.Tanaka, Y.Tatsumi, M.Kono: "Basalt platforms in Inner Mongolia and Hebei Province, northeastern China : New K-Ar ages, geochemistries, and revision of paleomagnetic results."Geophys.J.Int.. 151. 654-662 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Herrero-Bervera, E., E.Canon-Tapia, G.P.L.Walker, H.Tanaka: "Magnetic fabrics study and inferred flow directions of lavas of the Old Pali Road, Oahu, Hawaii."J.Volcanol.Geotherm.Res.. 118. 161-171 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Tanaka, H., T.Kobayashi: "PaleomaLgnetism of the late Quaternary Ontake Volcano, Japan : directions, intensities, and excursions."Earth Planets Space. 55. 189-202 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Tanaka, H., T.Kobayashi: "Paleomagnetism of the late Quaternary Ontake Volcano, Japan : directions, intensities, and excursions"Earth Planets Space. 55. 189-202 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Tanaka, H., M.Kono: "Paleointensities from a Cretaceous basalt platform in Inner Mongolia, northeastern China"Phys.Earth Planet.Inter.. 133. 147-157 (2002)

    • Related Report
      2003 Annual Research Report
  • [Publications] Zheng, Z., H.Tanaka, Y.Tatsumi, M.Kono: "Basalt platforms in Inner Mongolia and Hebei Province, northeastern China : New K-Ar ages, geochemistries, and revision of paleomagnetic results"Geophys.J.Int.. 151. 654-662 (2002)

    • Related Report
      2003 Annual Research Report
  • [Publications] Herrero-Bervera, E., E.Canon-Tapia, G.P.L.Walker, H.Tanaka: "Magnetic fabrics study and inferred flow directions of lavas of the Old Pali Road, Oahu, Hawaii"J.Volcanol.Geotherm.Res.. 118. 161-171 (2002)

    • Related Report
      2003 Annual Research Report
  • [Publications] Tanaka, H., M.Kono: "Paleointensities from a Cretaceous basalt platform in Inner Mongolia, northeastern China"Phys. Earth Planet. Inter. 133. 147-157 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Zheng, Z., H.Tanaka, Y.Tatsumi, M.Kono: "Basalt platforms in Inner Mongolia and Hebei Province, northeastern China : New K-Ar ages geochemistries and revision of naleomagnetic results"Geophys. J. Int.. 151. 654-662 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Herrero-Bervera, E., E.Canon-Tapia G.P.L.Walker, H.Tanaka: "Magnetic fabrics study and inferred flow directions of lavas of the Old Pali Road Oahu Hawaii"J.Volcanol. Geotherm. Res.. 118. 161-171 (2002)

    • Related Report
      2002 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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