Item type |
紀要論文(ELS) / Departmental Bulletin Paper(1) |
公開日 |
1986-07-01 |
タイトル |
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言語 |
en |
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タイトル |
REE adundances and Rb-Sr geochronology of Yamato-791197 |
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 |
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) |
Takahashi, Kazuya
Masuda, Akimasa
Shimizu, Hiroshi
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著者所属(英) |
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en |
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Department of Chemistry, The University of Tokyo/Department of Chemistry, The University of Tokyo/Department of Chemistry, The University of Tokyo |
抄録(英) |
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内容記述タイプ |
Other |
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内容記述 |
The REE abundances and the Sr isotopic compositions were determined for the separated samples and the clast sample of the "lunar meteorite", Yamato-791197. Most of the features of the REE patterns are similar to those of the lunar highland samples, especially a kind of anorthosites. And the positive Ce-anomalies, shown in all REE patterns, appear characteristic of the lunar origin. The age obtained from the Rb-Sr system is 3.89±0.36 b. y. and it is considered that this age shows the time when these materials underwent an event, such as brecciation or impact melting. However, as a noticeable point, the initial ^<87>Sr/^<86>Sr is significantly low, even lower than BABI or LUNI. This result suggests that the source material of these samples might have had very low ^<87>Sr/^<86>Sr and Rb/Sr abundance ratios. The clast sample from the chip subordinate No. 109 has the distinct REE pattern and Sr-isotope ratio. Therefore, this clast can be considered to have been formed by different evolution process from the other samples, and was mingled later with them. |
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 |
AA00733561 |
書誌情報 |
Memoirs of National Institute of Polar Research. Special issue
巻 41,
p. 96-105,
発行日 1986-07
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