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First systematic TEM-NanoSIMS coordinated study of
crystal structure and isotopic composition of presolar silicon carbide.
Daulton T. L., Stadermann F. J., Bernatowicz
T. J., Amari S., and Lewis R. S. (2006)
Meteorit. Planet. Sci. 41 (8, Suppl.), A42.
ABSTRACT
Submicron- to micron-sized presolar grains of SiC are
ubiquitous in the matrices of primitive chondrites. While numerous
studies have measured the isotopic compositions in primary and trapped
elements of individual presolar SiC grains, providing information on
their stellar sources, there have been few detailed studies of their
microstructure. Grain microstructures provide important information on
mechanisms of grain formation, physical conditions at sources of
formation, and metamorphic processing subsequent to formation. The
value of isotopic and microstructural measurements on presolar SiC
grains would be increased if those data sets were correlated to one
another on an individual grain basis.
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