Presolar Fe oxide from the Acfer 094 carbonaceous chondrite.

Stadermann F. J., Bose M., and Floss C. (2007)
Meteorit. Planet. Sci. 42 (8, Suppl.), A145.


ABSTRACT

Acfer 094 is one of the most primitive carbonaceous chondrites and contains high abundances of presolar silicate grains. However, little is known about the compositions of many of these grains. We are carrying out combined NanoSIMS and Auger Nanoprobe analyses of size separated fractions of Acfer 094 silicate matrix material in order to investigate the elemental and isotopic compositions of both silicate and oxide grains. We have identified presolar grains from Acfer 094 on the basis of their O isotopic compositions and determined their elemental compositions. Here we discuss a unique grain, 34C-10, that consists essentially only of Fe and O.


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