The alteration of chondrules and matrices in new Antarctic carbonaceous chondrites

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概要

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• Seven carbonaceous chondrites, Yamato-791717 (CO3), -74135 (CO3), -793321 (CM), -791198 (CM), -790003 (CM), Belgica-7904 (CM) and Y-791824 (CM) have been studied petrographically and petrologically to characterize their state of alteration. The degree of alteration of these specimens varies widely, from unaltered Y-791717 to intensely altered Y-791824. Petrographical criteria and chemical compositions, especially the Si-Mg-Fe ratios of chondrules and matrices, can be used to define the degree of alteration of CM chondrites. The degree of alteration is classified into four stages, as follows : (1) Unaltered stage, (2) Weakly-altered stage, (3) Moderately altered stage and (4) Intensely altered stage. No CM chondrite belonging to stage 1 has been found. Y-793321 and -791198 are altered to stage 2. Y-790003 belongs to stage 3,and the alteration degree of Y-791824 lies between stage 3 and 4. B-7904 appears to have suffered thermal metamorphism after being intensely altered.

• 国立極地研究所の論文

著者

• Ikeda Yukio

  Department Of Endocrinology Metabolism And Nephrology Kochi Medical School Kochi University

• KOJIMA Hideyasu

  National Institute of Polar Research

• Ikeda Yukio

  Department Of Material And Biological Sciences Ibaraki University

• Yanai Keizo

  National Institute of Polar Research

• Kojima Hideyasu

  Department Of Meteorites National Institute Of Polar Research

• Ikeda Yukio

  Department Of Earth Sciences Faculty Of Science Ibaraki University

• Ikeda Yukio

  Department Of Earth Science Faculty Of Science Ibaraki University

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