Lunar meteorite Yamato-86032: Mineralogical, petrological, and geochemical studies

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Author(s)

Abstract

Yamato-86032 is a shock-lithified anorthositic fragmental breccia. It consists mainly of highly feldspathic meta-breccias and meta-meltrocks and possibly contains a small contribution from mare lithologies, but there is no indication of a KREEP component. In many respects Y-86032 is similar to the previously described lunar meteorites Y-82192/3,but there are some notable differences. We have analyzed about 40 major and trace elements in bulk matrix, impact melt, and clast samples from two chips of Y-86032. The abundances of most lithophile and incompatible elements are lower in Y-86032 than in Y-82192 (which contains very low abundances compared to normal lunar highland rocks). The REE abundances are comparable to those of Y-82192. The elements Sc, Cr, Mn, Fe and Co have significantly lower abundances than in Y-82192,and the siderophile element pattern is also different. Since cosmic ray exposure data indicate pairing of Y-86032 with Y-82192/3,the source region for these meteorites on the moon must have been fairly heterogeneous.

Journal

  • Proceedings of the NIPR Symposium on Antarctic Meteorites   [List of Volumes]

    Proceedings of the NIPR Symposium on Antarctic Meteorites 3, 3-18, 1990-10  [Table of Contents]

    National Institute of Polar Research

Codes

  • NII Article ID (NAID)
    110000029897
  • NII NACSIS-CAT ID (NCID)
    AA10784627
  • Text Lang
    ENG
  • ISSN
    09145621
  • Data Source
    NII-ELS 
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