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Rb-Sr features of the impact-melted LL-chondrites from Antarctica:Yamato-790723 and Yamato-790528
https://doi.org/10.15094/00004585
https://doi.org/10.15094/00004585008266bf-0b76-4275-81ca-8345deaaafd2
名前 / ファイル | ライセンス | アクション |
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KJ00000036391 (1.2 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1992-03-01 | |||||
タイトル | ||||||
タイトル | Rb-Sr features of the impact-melted LL-chondrites from Antarctica:Yamato-790723 and Yamato-790528 | |||||
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 | 10.15094/00004585 | |||||
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) |
Fujimaki, Hirokazu
× Fujimaki, Hirokazu× Ishikawa, Ken-ichi× Aoki, Ken-ichiro |
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著者所属(英) | ||||||
en | ||||||
Institute of Mineralogy, Petrology, and Economic Geology, TohokuUniversity | ||||||
著者所属(英) | ||||||
en | ||||||
College of General Education, Tohoku University | ||||||
著者所属(英) | ||||||
en | ||||||
Instituteof Mineralogy, Petrology, and Economic Geology, Tohoku University | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Rubidium and strontium abundances as well as Sr isotopic compositions were analyzed for the impact-melted meteorites (LL-chondrite : Yamato-790723 and -790528) from Antarctica to clarify their Rb-Sr features and to date the impact events. The samples were separated according to the magnetic property. The less magnetic and glass-rich portions of Y-790723 approximate an isochron of 1.27±0.19 Ga. The obtained age should indicate the impact event. The magnetic portions and fine-grained one largely deviate from the isochron. Y-790528 is rather depleted in K_2O and Rb, but not in Na_2O; this may be due to scarcity of the K-rich fragments. The ^<87>Sr/^<86>Sr ratios of the separated portions from Y-790528 are low and less variable. The five less magnetic portions of the Y-790528 chondrite seem to form the isochron of 4.36±0.76Ga as the time of the impact event. The large errors may have derived from local reset of the Rb-Sr chronometer and incomplete separation into the portions. | |||||
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 5, p. 290-297, 発行日 1992-03 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |