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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. 42 (8, Suppl.), A48.
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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