Chromium and phosphorus enrichment in the metal of type II (C2) carbonaceous chondrites

Details Chromium and phosphorus enrichment in the metal of type II (C2) carbonaceous chondrites Chromium and phosphorus enrichment in the metal of type II (C2) carbonaceous chondrites

Sep 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973gecoa..37.2037o&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 37, Issue 9, pp.2037-2042

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Scientific paper

Electron microprobe analyses of metal grains in nine C2 meteorites show consistently high Cr and P contents, with large grain to grain variations within individual meteorites. Cr ranges from 0.16 to 1.0 wt.% (average 0.6 per cent for 43 analyses). P ranges from 0.00 to 3.2 wt.% (average 0.42 per cent). In addition, metal grains in seven C3 meteorites show a lesser enrichment of Cr, 0.00 to 0.7 per cent (average 0.13 per cent for 59 analyses), with no P present. Both of these elements, Cr and P, are generally below detection in the metal of other chondrite groups, equilibrated and unequilibrated. C2 metal grains occur typically as spherical to ovate blebs contained within single, euhedral forsterite crystals or crystal fragments that are either isolated in the black C2 matrix or are in clusters making up white inclusions. Metal is rare within true chondrules. Calculations of the expected Cr contents in metal condensing directly from a solar nebular gas agree remarkably well with the observed values. Unfortunately, no calculation is possible for P because of insufficient data at the present time. The composition and the textural relationships indicate this Cr, P rich metal, and the enclosing forsterite are direct condensates from a cooling solar nebula. Cr and P, in the quantities reported here, characterize C2 metal.

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