40Ar-39Ar analyses of Y-74063 and ALH-78230: Consortium study onunique meteorites from Antarctica
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概要
- 論文の詳細を見る
As part of a consortium study on unique meteorites from Antarctica, ^<40>Ar-^<39>Ar analyses were performed for two meteorites Y-74063 and ALH-78230,which are related to lodranite and the Acapulco meteorite. Y-74063,93 shows an ^<40>Ar-^<39>Ar plateau age of 4556±53 Ma, containing about 10^<-6>cm^3STP/g trapped ^<36>Ar. ALH-78230,55 also indicates an ^<40>Ar-^<39>Ar plateau age of 4531±23 Ma in the higher temperature fractions, but the lower temperature fractions suggest the occurrence of a later degassing event around 400-500 Ma. Trapped ^<36>Ar is about 10^<-8>cm^3STP/g. These results indicate that the two meteorites Y-74063 and ALH-78230 experienced different thermal histories.
- 国立極地研究所の論文
著者
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Takaoka Nobuo
Department Of Earth And Planetary Science Faculty Of Science Kyushu University
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Takaoka Nobuo
Department Ofearth Sciences Faculty Of Science Yamagata University
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Kaneoka Ichiro
Earthquake Research Institute University Of Tokyo
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Yanai Keizo
National Institute of Polar Research
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Yanai Keizo
National Instituteof Polar Research
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Kaneoka Ichiro
Earthquake Research Institute The University Of Tokyo
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