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Petrochemical study of the Yamato-691 enstatite chondrite (E3) V: Comparison of major element chemistries of chondrules and inclusions in Y-691 with those in ordinary and carbonaceous chondrites
https://doi.org/10.15094/00004481
https://doi.org/10.15094/00004481ec411aae-3df3-4011-b005-9a4449a4b6e3
名前 / ファイル | ライセンス | アクション |
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KJ00000036287 (2.3 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1989-10-01 | |||||
タイトル | ||||||
タイトル | Petrochemical study of the Yamato-691 enstatite chondrite (E3) V: Comparison of major element chemistries of chondrules and inclusions in Y-691 with those in ordinary and carbonaceous chondrites | |||||
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 | 10.15094/00004481 | |||||
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) |
Ikeda, Yukio
× Ikeda, Yukio |
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著者所属(英) | ||||||
en | ||||||
Department of Earth Sciences, Faculty of Science, Ibaraki University | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Major element compositions of chondrules and inclusions in Y-691 are different on the whole from those in ordinary and carbonaceous chondrites; the (CaO+AlO_<1.5>)/(CaO+AlO_<1.5>+SiO_2) and MnO/MgO ratios of chondrules in Y-691 are lower than those in ordinary and carbonaceous chondrites, but the SiO_2/(SiO_2+MgO) and MgO/(MgO+FeO) ratios are higher. These differences suggest that the chondrule precursors of Y-691 were produced by intense fractional condensation in comparison with those of ordinary and carbonaceous chondrites. For Y-691,the Ca/Al ratios of chondrules showing high Na/Al are lower than those of chondrules showing low Na/Al. This indicates that a fraction of Ca component was expelled from the chondrule precursors by reactions with a nebular gas, which also introduced alkalis into the chondrule precursors. In addition to magnesian chondrules, Y-691 includes unusual inclusions and ferroan chondrules. One unusual glassy inclusion, as well as others, are similar in chemical composition to fine-grained CAI's and amoeboid olivine inclusions in carbonaceous chondrites, respectively. The precursors of the unusual inclusions and ferroan barred-Ol-Px chondrules seem to have formed under oxidized conditions, whereas the precursors of magnesian chondrules were produced from a reduced nebular gas. The oxidizing conditions may have been produced by evaporation of chondritic or cometary materials in the solar nebula. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA10784627 | |||||
書誌情報 |
Proceedings of the NIPR Symposium on Antarctic Meteorites 巻 2, p. 147-165, 発行日 1989-10 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |