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In a ^\u003c87\u003e(Rb)-^\u003c87\u003e(Sr) evolution diagram, analyses from the severely shocked meteorites deviate from the 4.5 b. y.-evolution line although those of normal LL-chondrites are plotted on or close to the line, suggesting a late thermal evolution of these impact-melted meteorites. Analyses of mineral separates and a whole-rock from Y-790964 yield a Rb-Sr internal isochron age of 1197±54 (2σ) m. y. and an initial ^\u003c87\u003e(Sr)/^\u003c87\u003e(Sr) ratio of 0.73160±0.00028 (2σ). This age is the youngest known among impact-related materials in brecciated meteorites. In addition, the impact-melted meteorites have somewhat higher and fractionated REE, Sr, Rb and K abundances compared with normal LL chondrites. The 1.2 b. y. age is interpreted as a time of melting induced by intense impacts on the LL-chondrite parent body, accompanied by REE, Rb/Sr and K fractionations. 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A preliminary study of Rb-Sr systematics and trace element abundances on impact-melted LL-chondrites from Antarctica
https://nipr.repo.nii.ac.jp/records/1732
https://nipr.repo.nii.ac.jp/records/1732c5ac869f-2a07-42a7-b6c9-d9757d0378cb
名前 / ファイル | ライセンス | アクション |
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KJ00000012364 (1.7 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1984-12-01 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | A preliminary study of Rb-Sr systematics and trace element abundances on impact-melted LL-chondrites from Antarctica | |||||
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) |
Okano, Osamu
× Okano, Osamu× Misawa, Keiji× Nakamura, Noboru× Honma, Hiroji× Goto, Hiroya |
|||||
著者所属(英) | ||||||
en | ||||||
Department of Science of Material Differentation, Graduate School of Science and Technology, Kobe University/Department of Earth Sciences, Faculty of Science, Kobe University/Department of Science of Material Differentation, Graduate School of Science and Technology, Kobe University/Institute for Thermal Spring Research, Okayama University/Laboratory of Geosciences,College of Liberal Arts, Kobe University | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Rb-Sr systematics, REE, Ba, Sr, Rb, K, Ca and Mg abundances were analyzed in 1) whole-rock samples from 8 Antarctic LL-chondrites including 4 impact-melted rocks and 2 non-Antarctic LL chondrites, and 2) 8 mineral separates from one of the impact-melted meteorites, Y-790964. In a ^<87>(Rb)-^<87>(Sr) evolution diagram, analyses from the severely shocked meteorites deviate from the 4.5 b. y.-evolution line although those of normal LL-chondrites are plotted on or close to the line, suggesting a late thermal evolution of these impact-melted meteorites. Analyses of mineral separates and a whole-rock from Y-790964 yield a Rb-Sr internal isochron age of 1197±54 (2σ) m. y. and an initial ^<87>(Sr)/^<87>(Sr) ratio of 0.73160±0.00028 (2σ). This age is the youngest known among impact-related materials in brecciated meteorites. In addition, the impact-melted meteorites have somewhat higher and fractionated REE, Sr, Rb and K abundances compared with normal LL chondrites. The 1.2 b. y. age is interpreted as a time of melting induced by intense impacts on the LL-chondrite parent body, accompanied by REE, Rb/Sr and K fractionations. Therefore, we suggest that strong impact and regolith processes on the LL-chondrite parent body never ceased until at least 1.2 b. y. ago. | |||||
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 35, p. 285-297, 発行日 1984-12 |