Browsing ELibrary by Author "Walker R.M."

Browsing ELibrary by Author "Walker R.M."

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  • PRESOLAR SPINEL GRAINS FROM THE MURRAY AND MURCHISON CARBONACEOUS CHONDRITES 
    Zinner E.; Amari S.; Guinness R.; Nguyen A.; Stadermann F.J.; Walker R.M.; Lewis R.S. (2003)
    With a new type of ion microprobe, the NanoSIMS, we determined the oxygen isotopic compositions of small (<1μm) oxide grains in chemical separates from two CM2 carbonaceous meteorites, Murray and Murchison. Among 628 grains ...
  • PRISTINE PRESOLAR SILICON CARBIDE 
    Bernatowicz T.J.; Messenger S.; Pravdivtseva O.; Swan P.; Walker R.M. (2003)
    We report the results of a study of 81 micrometer-sized presolar SiC grains in the size range 0.5-2.6 μm from the Murchison (CM2) carbonaceous chondrite. We describe a simple, nondestructive physical disaggregation technique ...