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This calculation suggests that if the cumulates include a large amount of residual liquid (40-50%), a cumulate eucrite (mg=0.50-0.55) could crystallize from ordinary eucritic liquid (mg=0.35-0.40). 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Mineralogy of Yamato-791192, HED breccia and relationship between cumulate eucrites and ordinary eucrites
https://doi.org/10.15094/00005996
https://doi.org/10.15094/00005996e75f0b6b-90ed-4d37-8270-8c634e875d7f
名前 / ファイル | ライセンス | アクション |
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KJ00000040988 (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 | 2001-03-01 | |||||
タイトル | ||||||
タイトル | Mineralogy of Yamato-791192, HED breccia and relationship between cumulate eucrites and ordinary eucrites | |||||
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 | 10.15094/00005996 | |||||
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) |
Saiki,Kazuto
× Saiki,Kazuto× Takeda,Hiroshi× Ishii,Teruaki |
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著者所属(英) | ||||||
en | ||||||
Research Institute of Materials and Resources, Faculty of Engineering and Resource Science, Akita University/Research Institute, Chiba Institute of Technology/Ocean Research Institute, University of Tokyo | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Cumulate eucrites and noncumulate (ordinary) eucrites are considered to have come from one (or similar) parent body and to have formed the crust of the Vesta-like asteroid. However, their relationship is not well established as to whether they have crystallized in a different magma or have differentiated within the same magma. We studied mineralogically Yamato-791192,which is a unique HED breccia with abundant cumulate eucrite and a rare ordinary eucrite clasts. The characteristics of pyroxene suggest that the polymict breccia was generated by gathering locally ordinary eucrites and cumulate eucrites. On the other hand, the Fe/Mg distribution shows that the liquid coexisting with most cumulate eucrites was too Fe-rich (mg [=Mg/ (Mg+Fe) atomic ratio]=0.25-0.30) to have crystallized as ordinary eucrites (mg=0.35-0.40). We also applied the liquid trapping model of fractional crystallization and calculate the change of mg of liquid and solid during fractional crystallization. This calculation suggests that if the cumulates include a large amount of residual liquid (40-50%), a cumulate eucrite (mg=0.50-0.55) could crystallize from ordinary eucritic liquid (mg=0.35-0.40). In conclusion, cumulate eucrites probably crystallized directly from slightly evolved liquid, or they are produced by fractional crystallization with a large amount of trapped liquid. | |||||
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 14, p. 28-46, 発行日 2001-03 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |