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Presolar (circumstellar and interstellar) phases
in Renazzo: The effects of parent body
processing.
Floss C. and Stadermann F. J. (2005)
Lunar & Planet. Sci. XXXVI, Abstract #1390.
ABSTRACT
Like interplanetary dust particles (IDPs), the CR
chondrite Renazzo contains abundant isotopic anomalies in
both hydrogen and nitrogen, attesting to the primitive
nature of this meteorite. Renazzo has been suggested as a
promising analog for IDPs because it is the only meteorite
known to have D-rich hotspots and, like IDPs, it shows
evidence for several distinct D carriers. We have been using
the NanoSIMS to carry out isotopic (C, N, O) imaging studies
of IDPs and Renazzo matrix in order to compare the nature
and distribution of the primitive matter present in these
two types of extraterrestrial material. Several unresolved
issues remain, including whether the isotopic
characteristics of IDPs and primitive meteorites are
similar, whether the phases carrying isotopic anomalies are
the same in both materials, and what role parent body
processing has played. We have reported results for IDPs
elsewhere; here we focus on data obtained to date for
Renazzo matrix material.
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