Noble gas study of Yamato-82192 lunar meteorite

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著者

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

抄録

Concentrations and isotopic ratios of noble gases in matrix and glassy clast of the lunar meteorite Yamato-82192 are reported. Trapped gases are greatly depleted compared with other lunar meteorites (Yamato-791197 and Allan Hills A81005). However, the meteorite retains radiogenic ^<40>Ar quantitatively. The K-Ar age is 3.9±0.5 Ga, in good agreement with the ^<39>Ar-^<40>Ar age of Y-791197 and lunar highland rocks. From the three-isotope plot of Ne and the abundance pattern of the trapped gas, the trapped gas is of solar-type. The cosmogenic ^<22>Ne/^<21>Ne and ^<131>Xe/^<126>Xe ratios suggest low shielding. A model to explain the noble gas data is that the meteorite is composed of a mixture of regoliths from different shielding depths. The regolith mixture was compacted to breccia by a meteorite impact and resided at the low shielding depth of less than 40g/(cm)^2 for 20 to 40 m. y. The present specimen was produced from the interior of this regolith breccia by another meteorite impact and was thrown out to space. After the flight in space probably for less than 2 m. y., it fell in Antarctica.

収録刊行物

  • Memoirs of National Institute of Polar Research. Special issue

    Memoirs of National Institute of Polar Research. Special issue 46, 96-104, 1987-03

    国立極地研究所

各種コード

  • NII論文ID(NAID)
    110000010243
  • 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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