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Noble gases in ten, small Yamato chondrites
https://nipr.repo.nii.ac.jp/records/1386
https://nipr.repo.nii.ac.jp/records/1386a1f71fc1-dd4f-4bcb-ab21-f8887f8bb90e
名前 / ファイル | ライセンス | アクション |
---|---|---|
KJ00000012020.pdf (1.5 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1982-12-01 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Noble gases in ten, small Yamato chondrites | |||||
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 | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
著者名(英) |
Takaoka, Nobuo
× Takaoka, Nobuo |
|||||
著者所属(英) | ||||||
en | ||||||
Department of Earth Sciences, Faculty of Science, Yamagata University | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Concentrations of noble gases and isotopic compositions of He, Ne and Ar were determined for small Yamato chondrites. Five of the ten specimens studied showed high (^<22>(Ne)/^<21>(Ne))_c ratios, suggesting hard cosmic-ray irradiation in small bodies in space or near surfaces of meteoroids. Among them, Y-74447 (H) shows a cosmogenic ^<22>(Ne)/^<21>(Ne) ratio as high as 1.306±0.040,which suggests a very hard cosmic-ray irradiation in a small body. The preatmospheric size of this chondrite may be as small as inferred from its recovered mass (14.3g). No significant difference was found in cosmic-ray irradiation history between antarctic and non-antarctic chondrites. Cosmic-ray irradiation ages and U/Th-He and K-Ar ages are given. While Y-74138(H) was found to contain appreciable amounts of trapped, solar-type gases, Y-74060(H) shows complete loss of radiogenic ^4(He) and radiogenic ^<40>(Ar) as low as found in shocked L chondrites. The Y-74060 chondrite is one of those rare cases in which H chondrites lost radiogenic gases by shock or other metamorphic events. Trapped planetary gases are discussed in relation with petrologic types. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA00733561 | |||||
書誌情報 |
Memoirs of National Institute of Polar Research. Special issue 巻 25, p. 153-161, 発行日 1982-12 |