Noble gases in Yamato-791197: Evidence for lunar highland origin

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著者

    • Takaoka Nobuo
    • Department of Earth Sciences, Faculty of Science, Yamagata University

抄録

Concentrations and isotopic compositions of five stable noble gases were determined for a whole rock sample and a white clast prepared from the Yamato-791197 breccia. The whole rock contains large amounts of trapped gases originating from solar wind implantation. Relative elemental abundances and isotopic compositions of trapped gases indicate the possible origin of the Y-791197 meteorite from lunar highland regolith. The high concentrations of both trapped and spallogenic gases in the whole rock and the cosmogenic ^<131>Xe/^<126>Xe ratio in the white clast suggest that the meteorite resided at a low average cosmic-ray shielding less than 65g/(cm)^2. An exposure age of 910±60 Ma is tentatively estimated for the whole rock, whereas the exposure age for the white clast is shorter by a factor of about three.

収録刊行物

  • Memoirs of National Institute of Polar Research. Special issue

    Memoirs of National Institute of Polar Research. Special issue 41, 124-132, 1986-07

    国立極地研究所

各種コード

  • NII論文ID(NAID)
    110000010105
  • NII書誌ID(NCID)
    AA00733561
  • 本文言語コード
    ENG
  • ISSN
    03860744
  • データ提供元
    NII-ELS 
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