Yamato nakhlites: Petrography and mineralogy

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概要

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• We carried out the petrographical and mineralogical study of new Yamato nakhlites, Yamato 000593 (Y000593), Y000749 and Y000802, with electron probe microanalyser and Fourier transform infrared microspectrometer. Euhedral pyroxenes (En_<20-40>Fs_<22-40>Wo_<38-40>) are the predominant phase with a modal proportion of 75-80 vol% and occur as elongated grains (〜1mm x 0.5mm) with thin Fe-rich rims. The chemical composition of the augite cores comprising most of the volume of these pyroxene crystals is homogeneous and nearly identical with those in other nakhlites. Fe-rich rims are present in contact with the mesostasis. Anhedral ferroan olivines (Fa_<62-78>; 8-18 vol%, 〜0.5 mm) and subhedral titanomagnetites (< 1 vol%, smaller than 〜0.1mm) are minor phenocrysts. The remainder of the meteoritic material is mesostasis (8-15 vol%), which predominantly consists of plagioclase (An_<26-32>Ab_<63-65>Or_<4-8>). Minor phases in the mesostasis are pyrrhotite (Fe_<0.86-0.88>S; smaller than 20μm), apatite (smaller than 20μm), titanomagnetite, Ca-poor pyroxene, fayalitic olivine (Fa_<〜85>), tridymite and iddingsite. We distinguish these Yamato nakhlites from other nakhlites based on the chemical compositional ranges of the cores and rims of olivine and pyroxene phenocrysts. We suggest that the chemical variations of these minerals for the Yamato nakhlites are intermediate between those of NWA817 and others (Nakhla, Governador Valadares, and Lafayette). The study by Fourier transform infrared microspectrometer of altered phases both on rims and fractures in olivine phenocrysts and in mesostasis revealed the existence of OH-bearing minerals, which might be mixtures of montmorillonite (70%) and goethite (30%). The existence of bubbles in an OH-bearing phase in olivine grains in contact with the fusion crust suggests that the alteration occurred before atmospheric entry (i.e. Martian origin).

• 国立極地研究所の論文

著者

• 岩田 尚能

  山形大学理学部地球環境学科

• 岩田 尚能

  東大・地震研

• Ikeda Yukio

  Department Of Endocrinology Metabolism And Nephrology Kochi Medical School Kochi University

• Ikeda Yukio

  Department Of Earth Sciences Ibaraki University

• Ikeda Yukio

  Department Of Material And Biological Sciences Ibaraki University

• Imae Naoya

  Antarctic Meteorites Research Center National Institute Of Polar Research

• Imae Naoya

  Antarctic Meteorite Research Center National Institute Of Polar Research

• SHINODA Keiji

  Department of Pediatric Dentistry, Asahi University School of Dentistry

• Shinoda Keiji

  Department Of Geosciences Faculty Of Science Osaka City University

• Kojima Hideyasu

  Department Of Meteorites National Institute Of Polar Research

• Kojima Hideyasu

  Antarctic Meteorite Research Center National Institute Of Polar Research

• Iwata Naoyoshi

  Faculty of Sciences, Yamagata University

• 岩田 尚能

  山形大

• 岩田 尚能

  山形大・理

• 岩田 尚能

  Earthquake Research Institute University Of Tokyo

• Iwata Naoyoshi

  Earthquake Research Institute University Of Tokyo

• Iwata Naoyoshi

  Department Of Earth And Environmental Sciences Faculty Of Science Yamagata University

• Iwata Naoyoshi

  Faculty Of Sciences Yamagata University

• Kojima Hideyasu

  Antarctic Meteorites Research Center National Institute Of Polar Research

• Ikeda Yukio

  Department Of Earth Sciences Faculty Of Science Ibaraki University

• Kojima Hideyasu

  Antarctic Meteorite Center National Institute Of Polar Research 10-3 Midori-cho Tachikawa Tokyo 190-

• Ikeda Yukio

  Department Of Earth Science Faculty Of Science Ibaraki University

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