Noble gases and K-Ar ages of five Rumuruti chondrites Yamato(Y)-75302, Y-791827, Y-793575, Y-82002, and Asuka-881988
スポンサーリンク
概要
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Noble gases and K concentrations have been determined for aliquot samples prepared from the five Antarctic R-chondrites Yamato (Y)-75302,Y-791827,Y-793575,Y-82002,and Asuka (A)-881988. K-Ar ages of about 4.2Ga were obtained for Y-75302,Y-791827,Y-793575 and A-881988,while Y-82002 showed a slightly younger age of 3.9Ga. The Y-75302,Y-791827 and Y-82002 are enriched in solar light noble gases. Four meteorites Y-75302,Y-791827,Y-82002 and A-881988 have cosmic-ray exposure ages of about 20Ma, while the age of Y-793575 is about 7Ma. Based on the noble gas compositions and K-Ar ages, Y-75302 and Y-791827 are probably paired and Y-82002 may belong to this pair. Relatively high and variable ^<129>Xe/^<132>Xe ratios between 2-3.7 as well as enrichments of heavier Xe isotopes were observed in all R-chondrites.
- 国立極地研究所の論文
著者
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NAGAO KEISUKE
Laboratory for Earthquake Chemistry, Graduate School of Science, The University of Tokyo
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Nagao Keisuke
Laboratory For Earthquake Chemistry Graduate School Of Science University Of Tokyo
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Nakamura Noboru
Graduate School Of Science And Technology Kobe University
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Nagao Keisuke
Laboratory For Earthquake Chemistry Faculty Of Science The University Of Tokyo
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Okazaki Ryuji
Laboratory For Earthquake Chemistry Graduate School Of Science University Of Tokyo
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Sawada Shinobu
Graduate School of Science and Technology, Kobe University
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Sawada Shinobu
Graduate School Of Science And Technology Kobe University
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