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Noble gases, chemical composition, and cosmic-ray exposure age of the Yamato-74357 lodranite
https://doi.org/10.15094/00004684
https://doi.org/10.15094/00004684f8ece57f-36e2-4eb9-8047-447797ba57de
名前 / ファイル | ライセンス | アクション |
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KJ00000036490 (871.1 kB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1995-03-01 | |||||
タイトル | ||||||
タイトル | Noble gases, chemical composition, and cosmic-ray exposure age of the Yamato-74357 lodranite | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
ID登録 | ||||||
ID登録 | 10.15094/00004684 | |||||
ID登録タイプ | JaLC | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
著者名(英) |
Nagao,Keisuke
× Nagao,Keisuke× Eugster,Otto× Weigel,Andreas× Miura,Yayoi N.× Koeberl,Christian× Takaoa,Nobuo |
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著者所属(英) | ||||||
en | ||||||
Institute for Study of the Earth's Interior, Okayama University/Physikalisches Institute, University of Bern/Physikalisches Institute, University of Bern/Department of Earth and Planetary Physics, University of Tokyo/Institute of Geochemistry, University of Vienna/Department of Earth and Planetary Sciences,Faculty of Science, Kyushu University | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Cosmic-ray produced ^3He, ^<21>Ne, and ^<38>Ar concentrations and the chemical composition of the Yamato-74357 lodranite have been determined. Concordant concentrations of ^3He and ^<21>Ne have been obtained on both samples (Bern and Misasa). The concentration of cosmogenic ^<38>Ar is twice as high in the Bern as in the Misasa sample. The ^3He, ^<21>Ne and ^<38>Ar data for both samples yield an average cosmic-ray exposure age of 5.8±2.0Ma. This age indicates that Yamato-74357 belongs to the lodranite group, which probably originates from a common break-up event about 5Ma ago. Radiogenic ^4He and ^<40>Ar concentrations in the Bern sample are higher than those in the Misasa sample by more than a factor of two, suggesting that minerals enriched in U, Th and K are enriched in the finer grained fraction. The isotopic compositions of Kr and Xe are identical to those of the terrestrial atmosphere, except for the ^<129>Xe abundance. The small ^<129>Xe excess (^<129>Xe/^<132>Xe=1.15±0.04) is presumably due to the early formation of this meteorite. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA10784627 | |||||
書誌情報 |
Proceedings of the NIPR Symposium on Antarctic Meteorites 巻 8, p. 297-303, 発行日 1995-03 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |