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Minor element chemistry of low-Ca pyroxene in Allan Hills-77252, an L3-6 regolith breccia
https://doi.org/10.15094/00006012
https://doi.org/10.15094/00006012b073a1a1-3dca-4fa3-b2d3-67ccbc0a8544
名前 / ファイル | ライセンス | アクション |
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KJ00000041004 (2.5 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 2002-03-01 | |||||
タイトル | ||||||
タイトル | Minor element chemistry of low-Ca pyroxene in Allan Hills-77252, an L3-6 regolith breccia | |||||
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 | 10.15094/00006012 | |||||
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) |
Tomiyama, Takayuki
× Tomiyama, Takayuki× Yamaguchi, Akira× Misawa, Keiji× Kojima, Hideyasu |
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著者所属(英) | ||||||
en | ||||||
Department of Polar Science, School of Mathematics and Physics, The Graduate University for Advanced Studies/Antarctic Meteorite Research Center, National Institute of Polar Research/Antarctic Meteorite Research Center, National Institute of Polar Research/Antarctic Meteorite Research Center, National Institute of Polar Research | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Allan Hills (ALH-) 77252 is a regolith breccia consisting of various types of clasts differing in metamorphic grades (L3-6). Titanium/aluminum ratios of low-Ca pyroxene in ALH-77252 are bimodally distributed. In equilibrated clasts, Ti/Al ratios of low-Ca pyroxene are ∿0.5 which are quite different from those in unequilibrated clasts of ∿0.07. Among equilibrated and unequilibrated clasts, the Ti/Cr ratio of low-Ca pyroxene also shows large differences. Because titanium and aluminum are not diffusive elements in the pyroxene crystal structure, diffusional redistribution of titanium and aluminum in low-Ca pyroxene requires significantly higher metamorphic temperature than Fe-Mg homogenization, possibly above ∿800℃. Alternatively, if the source materials of L-group chondrites were initially different, the fingerprints of mineral properties resistant to thermal metamorphism remain unchanged. If this was the case, the distinctly higher Ti/Al ratios of low-Ca pyroxene in equilibrated clasts originated from the primary signatures of low-Ca pyroxene prior to thermal metamorphism. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA11182426 | |||||
書誌情報 |
Antarctic meteorite research 巻 15, p. 78-96, 発行日 2002-03 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |