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Anhydrous alteration of Allende chondrules in the solar nebura II: Alkali-Ca exchange reactions and formation of nepheline,sodalite and Ca-rich phases in chondrules
https://doi.org/10.15094/00004671
https://doi.org/10.15094/0000467139d35e2e-cf66-47ae-9997-e0ddbb595004
名前 / ファイル | ライセンス | アクション |
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KJ00000036477 (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 | 1995-03-01 | |||||
タイトル | ||||||
タイトル | Anhydrous alteration of Allende chondrules in the solar nebura II: Alkali-Ca exchange reactions and formation of nepheline,sodalite and Ca-rich phases in chondrules | |||||
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 | 10.15094/00004671 | |||||
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) |
Kimura, Makoto
× Kimura, Makoto× Ikeda, Yukio |
|||||
著者所属(英) | ||||||
en | ||||||
Department of Earth Sciences, Ibaraki University | ||||||
著者所属(英) | ||||||
en | ||||||
Department of Earth Sciences, Ibaraki University | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Fifty-eight Allende chondrules were studied to investigate secondary anhydrous alteration of chondrules. Nepheline and sodalite replace anorthite-normative cryptocrystalline groundmass and plagioclase. These reactions presumably took place by replacement of Ca of the anorthite component by 2 (Na, K) introduced from chondrules, and are called alkali-Ca exchange reactions. The degree of the reaction is variable among chondrules; a few chondrules display the reaction in the peripheral parts only. In contrast, the primary groundmass in some other chondrules was totally replaced by nepheline and sodalite. Most of the Allende chondrules were subjected to the alkali-Ca exchange reaction. Some Ca-rich phases such as hedenbergite, andradite, grossular, kirschsteinite and wollastonite, rarely occur intimately with nepheline and sodalite in groundmass. These Ca-rich phases are also secondary products in chondrules. During the alkali-Ca exchange reaction, part of the CaO released from anorthite was used to form the Ca-rich phases in chondrules. Since the abundance of the Ca-rich phases is too low, CaO was mostly lost from chondrules during the alkali-Ca exchange reaction. CAIs and chondrules in oxidized CV chondrites include similar secondary minerals, suggesting that both of them were subjected to the alkali-Ca exchange reaction under similar conditions. | |||||
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 8, p. 123-138, 発行日 1995-03 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |