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2006 Fiscal Year Final Research Report Summary

Paleoclimatic and orbital modulation of the geomagnetic field

Research Project

Project/Area Number 16204034
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Solid earth and planetary physics
Research InstitutionNational Institute of Advanced Industrial Science and Technology

Principal Investigator

YAMAZAKI Toshitsugu  National Institute of Advanced Industrial Science and Technology, Institute of Geology and Geoinformation, Group Leader, 地質情報研究部門, 研究グループ長 (80344125)

Co-Investigator(Kenkyū-buntansha) KANAMATSU Toshiya  Japan Agency for Marine-Earth Science and Technology, Institute for Research on Earth Evolution, Technical Scientist, 地球内部変動研究センター, 技術研究主任 (90344283)
ODA Hirokuni  National Institute of Advanced Industrial Science and Technology, Institute of Geology and Geoinformation, Senior Researcher, 地質情報研究部門, 主任研究員 (90356725)
YOKOYAMA Yukiko  Okayama University of Science, Faculty of Informatics, Associate Professor, 総合情報学部, 准教授 (40351879)
Project Period (FY) 2004 – 2006
Keywordspaleomagnetism / rock magnetism / paleointensity / Earth's orbit / time-series analysis / marine sediments / Eccentricity / 100 kyr period
Research Abstract

1. We investigated the strength of magnetostatic interaction among magnetic particles in marine sediments. On relative paleointensity estimation, IRM is preferable to ARM for normalizing difference in NRM acquisition efficiency of sediments because ARM acquisition is strongly affected by the magnetostatic interaction.
2. We constructed a paleointensity stack during the last 250 kyr in the Northwest Pacific. To obtain reliable relative paleointensity records, it is necessary to exclude horizons that suffer from dissolution of magnetic minerals owing to early diagenesis. The S-ratio, which represents a proportion of low coercivity magnetic minerals, is sensitive to magnetite dissolution, and thus can be used for detecting such horizons.
3. We obtained a relative paleointensity record during the last 1.6 m.y. from a sediment core in the North Pacific. The paleointensity and magnetic properties of this core were compared with those from the western equatorial Pacific. Relative paleointensiti … More es of the two areas coincide well, whereas magnetic properties differ greatly. A time-series analysis using a wavelet transform showed that paleointensity records contain variations with a time scale of 100 kyr. Variations of magnetic properties are not synchronous with those of paleointensity, and there is no significant correlation between the two even if they have a common time scale of 100 kyr. We thus conclude that the 100-kyr variations in paleointensity records are of geomagnetic origin, and not caused by magnetic property variations of sediments induced by paleoclimate changes.
4. Paleointensity and inclination variations during the last 800 kyr were recovered from cores in the eastern equatorial Indian Ocean (EEI). The area of a large inclination anomaly in the western equatorial Pacific (WEP) does not extend to the Indian Ocean. The model of long-term inclination variations that a weaker dipole field causes a larger relative contribution of persistent non-dipole components is supported. Less

  • Research Products

    (16 results)

All 2007 2006 2005 Other

All Journal Article (15 results) Book (1 results)

  • [Journal Article] Geomagnetic 100-ky variation extracted from paleointensity records of the equatorial and North Pacific sediments.2007

    • Author(s)
      Yokoyama, Y., Yamazaki, T., Oda, H.
    • Journal Title

      Earth, Planets and Space 59(in press)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] A relative paleointensity record of the geomagnetic field since 1.6Ma from the North Pacific.2007

    • Author(s)
      Yamazaki, T., Kanamatsu, T.
    • Journal Title

      Earth, Planets and Space 59(in press)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Relative paleointensity stack during the last 250 kyr in the Northwest Pacific.2007

    • Author(s)
      Yamamoto, Y., Yamazaki, T., Kanamatsu, T., 2 others
    • Journal Title

      Journal of Geophysical Research 112

      Pages: doi:10. 1029/2006JB004477

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Relative paleointensity stack during the last 250 kyr in the Northwest Pacific.2007

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

      J. Geophys. Res. 112

      Pages: doi:10.1029/2006JB004477

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] 北西太平洋海底コアにおける過去30万年間のテフラ層序 : 広域テフラおよび帯磁率変動曲線の対比に基づく年代モデルの構築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
  • [Journal Article] Tephrostratigraphy of deep-sea sediments in the Northwestern Pacific and its implications for the chronology of the past 300 kyr.2006

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

      The Quaternary Research 45(in Japanese with English abstract)

      Pages: 435-450

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] A geomagnetic paleointensity stack between 0.8 and 3 Ma from equatorial Pacific sediment cores.2005

    • Author(s)
      Yamazaki, T., Oda, H.
    • Journal Title

      Geochemistry, Geophysics, Geosystems 6

      Pages: doi:10.1029/2005G0001001

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 海底堆積物から明らかになった古地磁気強度変動像-地球システム変動の一部としての視点-2005

    • Author(s)
      山崎俊嗣
    • Journal Title

      地学雑誌 114

      Pages: 151-160

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 頻繁に起こる地磁気エクスカーション-ブルネ正磁極期のレビュー-2005

    • Author(s)
      小田啓邦
    • Journal Title

      地学雑誌 114

      Pages: 174-193

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] A geomagnetic paleointensity stack between 0.8 and 3.0 Ma from equatorial Pacific sediment cores.2005

    • Author(s)
      Yamazaki, T., Oda, H.
    • Journal Title

      Geochem., Geophys., Geosyst. 6

      Pages: doi:10.1029/2005GC001001

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Geomagnetic paleointensity fluctuation revealed from marine sediment cores : a perspective as the part of Earth system.2005

    • Author(s)
      Yamazaki, T.
    • Journal Title

      Journal of Geography 114(in Japanese with English abstract)

      Pages: 151-160

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Recurrent geomagnetic excursions : a review for the Brunhes normal polarity chron.2005

    • Author(s)
      Oda, H.
    • Journal Title

      Journal of Geography 114(in Japanese with English abstract)

      Pages: 174-193

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Geomagnetic 100-ky variation extracted from paleointensity records of the equatorial and North Pacific sediments.

    • Author(s)
      Yokoyama, Y., Yamazaki, T., Oda, H.
    • Journal Title

      Earth, Planets and Space (in press)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] A relative paleointensity record of the geomagnetic field since 1.6 Ma from the North Pacific.

    • Author(s)
      Yamazaki, T., Kanamatsu, T.
    • Journal Title

      Earth, Planets and Space (in press)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Paleointensities.

    • Author(s)
      Tauxe, L., Yamazaki, T.
    • Journal Title

      Treatise of Geophysics vol.5, Geomagnetism, Chapter 13, Elsevier (in press)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Book] Treatise of Geophysics, vol.5, Geomagnetism, Chapt.13, Paleointensities.2007

    • Author(s)
      Tauxe, L., Yamazaki, T.
    • Publisher
      Elsevier(in press)
    • Description
      「研究成果報告書概要(和文)」より

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Published: 2008-05-27  

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