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Exposure age and terrestrial age of the paired meteorites Yamato-82192 and -82193 from the moon
https://doi.org/10.15094/00004451
https://doi.org/10.15094/000044511481af5c-3bc6-408a-bb24-8548cfc6a666
名前 / ファイル | ライセンス | アクション |
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KJ00000036257 (1.3 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1988-03-01 | |||||
タイトル | ||||||
タイトル | Exposure age and terrestrial age of the paired meteorites Yamato-82192 and -82193 from the moon | |||||
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 | 10.15094/00004451 | |||||
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) |
Eugster, O.
× Eugster, O. |
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著者所属(英) | ||||||
en | ||||||
Physikalisches Institute, University of Bern | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | The isotopic abundances of the noble gases in the lunar meteorites Yamato-82192 and -82193 were investigated with emphasis on the determination of the exposure history and the terrestrial age. Both meteorites contain low amounts of solar wind trapped noble gases indicating that the breccia grains resided for a very brief period of time on the lunar surface compared to typical lunar soil. Strong gas losses are reflected by the extremely low concentrations of He. Identical exposure histories are derived for both meteorites confirming earlier suggestions that they represent a paired fall. The investigated samples experienced a shallow shielding to cosmic rays of less than 25g/cm^2. From the activity of cosmogenic radionuclides we conclude that the meteoroid spent at least 5Ma of its most recent exposure history in free space. Assuming excavation on the Moon from a depth completely shielded from cosmic rays and propulsion into Earth orbit by the same impact event we calculate a Moon-Earth transit time, i. e. an exposure age in free space at 4π exposure geometry of 11±2Ma. The terrestrial age of the Y-82192/3 meteorite is 70000 to 80000 years which is typical for the meteorites collected in the Yamato Mountains. | |||||
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 1, p. 135-141, 発行日 1988-03 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |