Northwest Africa 1232-a CO3 carbonaceous chondrite with two lithologies
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概要
- 論文の詳細を見る
Northwest Africa 1232 (NWA 1232) is a carbonaceous chondrite consisting of two lithologies (A and B) that are separated by a sharp boundary. A petrographic and mineralogical study indicates that both lithologies can be classified as type CO3. However, olivine in lithology B chondrules is more enriched in Fe than in lithology A, whereas olivine in lithology B matrix is more depleted in Fe than in lithology A. Chondrules and Ca-Al-rich inclusions (CAIs) in lithology B show a higher degree of nephelinization than those in lithology A. These differences can be explained by that lithology B has gone through a higher degree of thermal metamorphism than lithology A. These two lithologies probably represent rocks that have been thermally metamorphosed at different locations within a single CO parent body and later mixed to form the present combined rock during a brecciation process.
- 日本鉱物科学会の論文
- 2008-04-01
著者
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Tomeoka Kazushige
Department of Earth Sciences, Faculty of Science, Kobe University
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Tomeoka Kazushige
Department Of Earth And Planetary Sciences Faculty Of Science Kobe University
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KIRIISHI Miho
Department of Earth and Planetary Sciences, Faculty of Science, Kobe University
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Kiriishi Miho
Department Of Earth And Planetary Sciences Faculty Of Science Kobe University
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