Noble Gases and 81Kr Terrestrial Ages of Antarctic Eucrites (〔希ガスの質量分析に関する特集〕)
スポンサーリンク
概要
- 論文の詳細を見る
Noble gas isotopic compositions and concentrations were measured for two monomict eucrites Yamato-791186 and -792510 and for three polymict eucrites Yamato-791960, -791962 and -792769. Terrestrial ages calculated on the concentrations of cosmogenic radionuclide 81Kr are in the range of 0.23-0.35 Ma, which are older than those reported for Yamato meteorites including eucrites. The noble gas result suggests that the monomict eucrites, Y-791186 and Y-792510, and the polymict eucrites, Y-791960 and Y-791962, are paired. If shielding effect on the cosmogenic 78Kr/83Kr ratio was considered, the preatmospheric radius of Y-791186 and Y-792510 was estimated to be small (about 10 cm in diameter). It was also calculated that Y-791960 was near the surface and Y-791962 was at the center of a preatmospheric body of about 1m in diameter. At least five pairs are identified for eucrites in the Yamato ice field referred to the published data.
- 日本質量分析学会の論文
著者
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Nagao K
Okayama Univ. Tottori Jpn
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Nagao K.
Institute for Study of the Earths Interior, Okayama University
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Ogata A.
Institute for Study of the Earths Interior, Okayama University
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