Item type |
紀要論文(ELS) / Departmental Bulletin Paper(1) |
公開日 |
1992-03-01 |
タイトル |
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タイトル |
Rb-Sr features of the impact-melted LL-chondrites from Antarctica:Yamato-790723 and Yamato-790528 |
言語 |
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言語 |
eng |
資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
departmental bulletin paper |
ID登録 |
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ID登録 |
10.15094/00004585 |
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ID登録タイプ |
JaLC |
ページ属性 |
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内容記述タイプ |
Other |
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内容記述 |
P(論文) |
著者名(英) |
Fujimaki, Hirokazu
Ishikawa, Ken-ichi
Aoki, Ken-ichiro
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著者所属(英) |
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en |
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Institute of Mineralogy, Petrology, and Economic Geology, TohokuUniversity |
著者所属(英) |
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en |
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College of General Education, Tohoku University |
著者所属(英) |
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en |
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Instituteof Mineralogy, Petrology, and Economic Geology, Tohoku University |
抄録(英) |
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内容記述タイプ |
Other |
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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 |
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収録物識別子タイプ |
NCID |
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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 |
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出版者 |
National Institute of Polar Research |