The Shaw chondrite. I - The case of the missing metal

Details The Shaw chondrite. I - The case of the missing metal The Shaw chondrite. I - The case of the missing metal

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..33...61r&link_type=abstract

Earth and Planetary Science Letters, vol. 33, Nov. 1976, p. 61-66. Research supported by the Deutsche Forschungsgemeinschaft

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3

Chondrites, Geochemistry, Meteoritic Composition, Mineralogy, Trace Elements, Chemical Composition, Iron Meteorites, Melting, Metal Particles

Scientific paper

The mineralogy as well as the elemental and isotopic composition of the Shaw meteorite indicate that it is a highly metamorphosed L-group chondrite which has lost a portion of its metal and sulfide. The metal which remains has an unusual composition relative to that in other L-group chondrites. It is enriched in Ga, Ge, Ir, Mo, Os, Pt, Re, and Ru but depleted in As, Au, Cu, and Sb. A comparison of the relative enrichments and depletions in Shaw with those observed in San Cristobal, the extreme end-member of group IAB iron meteorites, shows that the metal phases in these two meteorites have complementary compositions. This implies that the metal in Shaw represents the residual solid of a partial melting process while the missing metal, which drained away, may have gone to form an iron meteorite, like San Cristobal.

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