Mineralogy of Antarctic lunar meteorites and differentiated products of the lunar crust

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著者

    • Takeda Hiroshi
    • Mineralogical Institute, Faculty of Sciences, University of Tokyo
    • Mori Hiroshi
    • Mineralogical Institute, Faculty of Sciences, University of Tokyo
    • Tagai Tokuhei
    • Mineralogical Institute, Faculty of Sciences, University of Tokyo

抄録

The mineralogy of clasts containing pyroxenes and glassy matrices of lunar meteorites, Yamato-791197 (Y-791197) and Allan Hills A81005 (ALHA81005) has been studied by an electron microprobe and an analytical transmission electron microscope (ATEM). A rare brown pyroxene-rich clast (HPF) consists of hedenbergite, Ca-poor iron-rich pyroxene, plagioclase, fayalite, silica and ilmenite. This exotic component may be a differentiated product of the lunar crust or an iron-rich portion of a basalt. The evolutionary trend of Y-791197 from spinel troctolite to anorthosite in the An content vs. Mg/(Mg+Fe) diagram is similar to that of ALHA81005 and is located between the Mg-rich suite of rocks and ferroan anorthosite. It is difficult to prove that this trend represents a single differentiation and that the HPF clast is on the extension of this trend, because the data appear to define a trend of extremely steep slope. The glass in the matrix of ALHA81005 is devitrified on the TEM scale.

収録刊行物

  • Memoirs of National Institute of Polar Research. Special issue

    Memoirs of National Institute of Polar Research. Special issue 41, 45-57, 1986-07

    国立極地研究所

各種コード

  • NII論文ID(NAID)
    110000010098
  • NII書誌ID(NCID)
    AA00733561
  • 本文言語コード
    ENG
  • ISSN
    03860744
  • データ提供元
    NII-ELS 
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