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High abundances of presolar silicates in
Antarctic micrometeorites; implications for their cometary
origins
Yada T., Stadermann F. J., Floss C., Zinner E.,
Nakamura T., Noguchi T., and Lea A. S. (2006) Lunar
Planet. Sci. XXXVII, Abstract #1470.
ABSTRACT
Micrometeorites are the dominant type of extraterrestrial
material accreting onto the Earth. Their parent bodies are
thought to be asteroids and comets, although the
mineralogical and chemical studies indicate that most should
have originated from asteroids because of their similarities
to carbonaceous (C) chondrites. We previously reported the
presence of presolar silicates in Antarctic micrometeorites
(AMMs). Here, we present a revised abundance of presolar
silicates in AMMs and compare it with that of both anhydrous
interplanetary dust particles (IDPs), which are thought to
be of cometary origin, and C chondrites, in order to
constrain the parent bodies of AMMs.
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