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An oxygen-18 rich presolar silicate grain from
the Acfer 094 meteorite: A NanoSIMS and TOF-SIMS
study.
Stadermann F. J., Floss C., Bland P. A., Vicenzi E. P.,
and Rost D. (2005)
Lunar & Planet. Sci. XXXVI, Abstract #2004.
ABSTRACT
The Acfer 094 meteorite is a primitive carbonaceous
chondrite with an unusually high concentration of presolar
grains. The presolar components of this meteorite's matrix
have been identified on the basis of their highly anomalous
O isotopic compositions and recent advances in
microanalytical technology, most notably the development of
the NanoSIMS. In an initially unrelated study, we used the
NanoSIMS to determine the O isotopic variations in small
Ca-Al rich inclusions (micro-CAIs) that were identified in
the matrix of Acfer 094 by time-of-flight secondary ion mass
spectrometry (ToF-SIMS) imaging. Here we report on the
accidental discovery of an 18O-rich presolar
grain during the course of these measurements. Since the
area of the presolar grain was previously analyzed by
ToF-SIMS, we have correlated elemental and isotopic data to
aid in the mineralogical identification of the particle.
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