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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, Abstract #5260.
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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