The Kobe CK carbonaceous chondrite : petrography, mineralogy and metamorphism
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概要
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A petrographic and mineralogical study of Kobe indicates that it can be classified as a CK4 carbonaceous chondrite. CK chondrites differ from other groups of carbonaceous chondrites, because all normal CK chondrites have been thermally metamorphosed. Olivine and plagioclase are the two most abundant minerals in Kobe. Olivine is very homogeneous in composition, which is consistent with the metamorphic feature of Kobe. However, plagioclase shows large grain to grain compositional variations. The matrix and chondrule mesostases exhibit pronounced silicate darkening. They contain unusual olivine that contains numerous small vesicles (< 0.1-3 μm in diameter) and inclusions (< 0.1-10 μm) of magnetite, pentlandite and minor plagioclase, pyroxene and chlorapatite. The vesicular olivine is particularly abundant in regions that exhibit a high degree of darkening. The vesicular olivine is clearly the principal cause of the silicate darkening. Plagioclase in matrix and chondrule mesostases also contains numerous small vesicles and inclusions of magnetite, pyroxene and minor pentlandite and olivine. The texture and mineralogy of the vesicular olivine and plagioclase suggest that they recrystallized from melts that were produced from olivine and plagioclase in the matrix by shock. We suggest that the shock event occurred at a relatively mild pressure and a high temperature, probably at the state where the meteorite underwent thermal metamorphism.
- 日本鉱物科学会の論文
- 2005-06-01
著者
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NAKAMURA NOBORU
Department of Earth and Planetary Sciences, Kobe University
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Ishii Yoshitaka
Department of Applied Chemistry, School of Science and Engineering, Waseda University
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OHNISHI ICHIRO
Department of Gastroenterologic Surgery, Graduate School of Medical Science, Kanazawa University
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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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Ohnishi Ichiro
Dep. Of Earth And Planetary Sciences Fac. Of Sci. Kobe Univ.
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Ohnishi Ichiro
Department Of Earth And Planetary Sciences Faculty Of Science Kobe University
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Tomeoka Kazushige
Dep. Of Earth And Planetary Sciences Fac. Of Sci. Kobe Univ.
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Ishii Yoshitaka
Department Of Earth And Planetary Sciences Faculty Of Science Kobe University
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KOJIMA Tomoko
Department of Environmental Science, Faculty of Science, Kumamoto University
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Nakamura Noboru
Department Of Earth And Planetary Sciences Faculty Of Science Kobe University
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Nakamura Noboru
Department Of Earth & Planetary Sciences Kobe University
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Kojima Tomoko
Department Of Earth And Planetary Sciences Faculty Of Science Kobe University
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Kojima Tomoko
Department Of Environmental Science Faculty Of Science Kumamoto University
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Ishii Yoshitaka
Department Of Applied Chemistry Faculty Of Science And Engineering Waseda University
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Nakamura Noboru
Department Of Earth & Planetary Sciences Faculty Of Science And Division Of The Nature Of The Ea
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Kojima Tomoko
Department of Chemistry, Faculty of Science, Tokyo Metropolitan University
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