ハワイ沖深海底堆積物から選別した磁性球粒の物理的,化学的特徴  [in Japanese] Physical and chemical characteristics of magnetic spherules separated from deep sea sediment dredged off Hawaii islands  [in Japanese]

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Abstract

Magnetic spherules were separated from the deep-sea sediments dredged off the Hawaii islands. Spherules were classified by size and magnetic property. The abundance of magnetic spherules in the sediments used in this study is 3.3 × 10<sup>-6</sup>g/g wet sediments. The trend seen in the size distribution of spherules with diameters ranging from several urn to 590μm is consistent with the reported one for magnetic spherules larger than 100μm. Twenty two magnetic spherules were individually analyzed by instrumental neutron activation analysis and Fe, Co, Ni and Ir were determined. Iridium contents, Ni/Fe ratios and Co/Fe ratios were suggested for effective criteria in discussing the origin of magnetic spherules. Judging from chemical compositions, at least 14 out of the 22 spherules analyzed in this study were inferred to be extraterrestrial in origin.

Journal

  • Chikyukagaku

    Chikyukagaku 32(4), 233-241, 1998

    The Geochemical Society of Japan

References:  20

Codes

  • NII Article ID (NAID)
    110008679965
  • NII NACSIS-CAT ID (NCID)
    AN00141280
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    0386-4073
  • NDL Article ID
    4628328
  • NDL Source Classification
    ZM41(科学技術--地球科学)
  • NDL Call No.
    Z15-645
  • Data Source
    CJP  NDL  NII-ELS  J-STAGE 
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