Fe-Mg heteorogeneity in the low-Ca pyroxenes during metamorphism of the ordinary chondrites

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概要

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• Pyroxenes in nine ordinary chondrites, ALH-764 (LL3), ALH-77214 (L3.4), ALH-77015 (L3.5), Yamato-74191 (L3.6), Hedjaz (L3.7), ALH-77304 (LL3.8), ALH-78084 (H3.9), Yamato-75097 (L4) and ALH-77230 (L4), were examined by an optical microscope, a scanning electron microscope with a back-scattered electron image technique, and an X-ray microprobe analyzer. Characteristic textures due to alternating lamellae of Fe-rich and Fe-poor compositions have been found in the low-Ca pyroxenes in the chondrites irrespective of their chemical groups, H, L and LL. As far as the author knows, this is the first observation of such lamellae textures in the pyroxenes. These textures are common and remarkable in the higher subtypes of type 3 chondrites (L3.6,L3.7,LL3.8 and H3.9), while they are rare in lower subtypes (<3.5) and type 4 chondrites. These textures are considered to have been formed in the Fe-Mg homogenization process of the ordinary chondrites during metamorphism.

• 国立極地研究所の論文

著者

• Fujita Takashi

  Department Of Cardiology Kanazawa University

• TSUCHIYAMA Akira

  Department of Earth and Space Science, Osaka University

• Morimoto Nobuo

  Department Of Geology And Mineralogy Faculty Of Science Kyoto University

• Tsuchiyama Akira

  Department Of Culture Osaka University

• Tsuchiyama Akira

  Department Of Geology And Mineralogy Faculty Of Science Kyoto University

• Fujita Takashi

  Department Of Breast Oncology Aichi Cancer Center Hospital

• Fujita Takashi

  Department Of Biochemistry The University Of Sydney

• Fujita Takashi

  Department Of Anesthesiology Suwa Red Cross Hospital

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