Other
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997m%26ps...32..617p&link_type=abstract
Meteoritics, vol. 32, pages 617-627
Other
51
Scientific paper
Stepwise dissolution of bulk Orgueil reveals that all of the Cr in the whole rock is isotopically anomalous, an anomaly pattern that is thus far unique. Most of the Cr (along with other major and minor cations) is dissolved by a cetic and nitric acids; it is deficient in 54Cr by about 5. Subsequent treatment with hydrochloric acid dissolves a small fraction of the Cr with positive 54Cr anomalies, up to about 210. Mass balance indicates that whole rock Cr is isotopically normal within analytical uncertainties. The least extravagant interpretation of these results is that some mineral phase is enriched in a heavy-Cr nucleosynthetic component while most of the Cr is a homogenized mixture of diverse nucleosynthetic components which would be normal except for lack of the postulated heavy Cr carrier. The carrier is likely but not necessarily presolar interstellar grains. Its identity is unknown and constrained only circumstantially: It must be relatively rich in Cr, it is substantially soluble in hydrochloric acid, and it is not magnetite or spinel/chromite. SEM examination of Orgueil reveals candidate Cr-rich oxides, silicates, sulfides and phosphides, but none of these can yet be identified as the heavy Cr carrier. Whether presolar or not, the carrier is not chemically resistant and likely not thermally refractory, differing there by from most other phases known to host isotopic anomalies; its survival (or production) thus establishes constraints on a different regime of nebular history.
Bernatowicz Thomas J.
Brannon Joyce C.
Mahan S. E.
Neal Chris R.
Ott Ulrich
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