Noble gas and chronological study of Asuka eucrites: A-880761 and A-881388 are paired, but A-880702 is not
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概要
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Noble gas isotopic and elemental compositions of three Antarctic eucrites Asuka-880702, Asuka-880761 and Asuka-881388 have been measured by two steps of heating temperatures (400 and 1750°C ). Cosmic-ray exposure ages calculated from cosmogenic ^(21)Ne were 20.5, 32.3 and 29.7m.y. for A-880702, A-880761 and A-881388, respectively. Combining the exposure ages with ^(81)Kr-Kr apparent exposure ages, terrestrial ages of 0.20, 0.22 and 0.23m.y. were derived for A-880702, A-880761 and A-881388, respectively. ^(244)Pu-Xe ages based on fissiogenic Xe isotopes showed that the Asuka eucrites began Xe retention at around the crystallization age of Angra dos Reis. Among the Asuka eucrites, A-880702 is about 20m.y. older than the others. From the noble gas and age data described above, we conclude that A-880761 and A-881388 are paired, but A-880702 is not.
- 国立極地研究所の論文
著者
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Nagao Keisuke
Laboratory For Earthquake Chemistry Faculty Of Science The University Of Tokyo
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Park Jisun
Laboratory For Earthquake Chemistry Graduate School Of Science University Of Tokyo
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