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Very high presolar grain abundances in the CR
chondrite QUE 99177.
Floss C. and Stadermann F. J. (2007)
Meteorit. Planet. Sci., Abstract #5060.
ABSTRACT
CR chondrites represent one of the most primitive
chondrite groups and have often been compared with IDPs
because both types of materials contain abundant H and N
isotopic anomalies. However, whereas IDPs contain abundant
presolar silicates, such grains are very rare in CR
chondrites measured to date. In order to explore whether
aqueous alteration accounts for the lack of presolar
silicates in these meteorites, we are investigating the
presolar grain abundances in the CR chondrite QUE 99177,
which is less altered than most members of this group.
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