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Isotopic Evidence for Multi-stage Cosmic-ray Exposure Histories of Lunar Meteorites: Long Residence on the Moon and Short Transition to the Earth
http://hdl.handle.net/2237/26934
http://hdl.handle.net/2237/269343c411b2b-bf0a-4e87-af77-dab0c3e997f6
名前 / ファイル | ライセンス | アクション |
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Hidaka_2017_AJ_153_274.pdf (521.3 kB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2017-09-04 | |||||
タイトル | ||||||
タイトル | Isotopic Evidence for Multi-stage Cosmic-ray Exposure Histories of Lunar Meteorites: Long Residence on the Moon and Short Transition to the Earth | |||||
言語 | en | |||||
著者 |
Hidaka, Hiroshi
× Hidaka, Hiroshi× Sakuma, Keisuke× Nishiizumi, Kunihiko× Yoneda, Shigekazu |
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アクセス権 | ||||||
アクセス権 | open access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||
権利 | ||||||
言語 | en | |||||
権利情報 | © 2017. The American Astronomical Society | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | meteorites | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | meteors | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | meteoroids | |||||
抄録 | ||||||
内容記述 | It is known that most lunar meteorites have complicated cosmic-ray exposure experiences on the Moon and in space. In this study, cosmic-ray irradiation histories of six lunar meteorites, Dhofar 489, Northwest Africa 032 (NWA 032), NWA 479, NWA 482, NWA 2995, and NWA 5000, were characterized from neutron-captured isotopic shifts of Sm and Gd, and from the abundances of long-lived cosmogenic radionuclides like 10Be, 26Al, 36Cl, and 41Ca. Sm and Gd isotopic data of all of six meteorites show significant isotopic shifts of 149Sm–150Sm and 157Gd–158Gd caused by accumulation of neutron capture reactions due to cosmic-ray irradiation, corresponding to the neutron fluences of (1.3–9.6)×1016 n cm^−2. In particular, very large Sm and Gd isotopic shifts of NWA 482 are over those of a lunar regolith 70002, having the largest isotopic shifts among the Apollo regolith samples, corresponding to cosmic-ray exposure duration over 800 million years in the lunar surface (2π irradiation). Meanwhile, the concentrations of cosmogenic radionuclides for individual six meteorites show the short irradiation time less than one million years as their bodies in space (4π irradiation). Our data also support the results of previous studies, revealing that most of lunar meteorites have long exposure ages at shallow depths on the Moon and short transit times from the Moon to the Earth. | |||||
言語 | en | |||||
内容記述タイプ | Abstract | |||||
出版者 | ||||||
言語 | en | |||||
出版者 | IOP publishing | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプresource | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | journal article | |||||
出版タイプ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
DOI | ||||||
関連タイプ | isVersionOf | |||||
識別子タイプ | DOI | |||||
関連識別子 | https://doi.org/10.3847/1538-3881/aa7139 | |||||
ISSN | ||||||
収録物識別子タイプ | PISSN | |||||
収録物識別子 | 0004-6256 | |||||
書誌情報 |
en : The Astronomical Journal 巻 153, 号 6, p. 274-274, 発行日 2017-06 |
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著者版フラグ | ||||||
値 | publisher | |||||
URI | ||||||
識別子 | https://doi.org/10.3847/1538-3881/aa7139 | |||||
識別子タイプ | DOI | |||||
URI | ||||||
識別子 | http://hdl.handle.net/2237/26934 | |||||
識別子タイプ | HDL |