Martian dunite NWA 2737: Integrated spectroscopic analyses of brown olivine

DOI Web Site Web Site 被引用文献7件
  • Carle M. Pieters
    Department of Geological Sciences Brown University Providence Rhode Island USA
  • Rachel L. Klima
    Department of Geological Sciences Brown University Providence Rhode Island USA
  • Takahiro Hiroi
    Department of Geological Sciences Brown University Providence Rhode Island USA
  • M. Darby Dyar
    Department of Astronomy Mount Holyoke College South Hadley Massachusetts USA
  • Melissa D. Lane
    Planetary Science Institute Tucson Arizona USA
  • Allan H. Treiman
    Lunar and Planetary Institute Houston Texas USA
  • Sarah K. Noble
    Astromaterials Research and Exploration Science Division Johnson Space Center Houston Texas USA
  • Jessica M. Sunshine
    Department of Astronomy University of Maryland College Park Maryland USA
  • Janice L. Bishop
    NASA Ames Research Center Mountain View California USA

書誌事項

公開日
2008-06
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2007je002939
公開者
American Geophysical Union (AGU)

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説明

<jats:p>A second Martian meteorite has been identified that is composed primarily of heavily shocked dunite, Northwest Africa (NWA) 2737. This meteorite has several similarities to the Chassigny dunite cumulate, but the olivine is more Mg rich and, most notably, is very dark and visually brown. Carefully coordinated analyses of NWA 2737 whole‐rock and olivine separates were undertaken using visible and near‐infrared reflectance, midinfrared emission and reflectance, and Mössbauer spectroscopic studies of the same samples along with detailed petrography, chemistry, scanning electron microscopy, and transmission electron microscopy analyses. Midinfrared spectra of this sample indicate that the olivine is fully crystalline and that its molecular structure remains intact. The unusual color and spectral properties that extend from the visible through the near‐infrared part of the spectrum are shown to be due to nanophase metallic iron particles dispersed throughout the olivine during a major shock event on Mars. Although a minor amount of Fe<jats:sup>3+</jats:sup> is present, it cannot account for the well‐documented unusual optical properties of Martian meteorite NWA 2737. Perhaps unique to the Martian environment, this “brown” olivine exhibits spectral properties that can potentially be used to remotely explore the pressure‐temperature history of surface geology as well as assess surface composition.</jats:p>

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