Metallic copper in ordinary chondrites

Details Metallic copper in ordinary chondrites Metallic copper in ordinary chondrites

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29...93r&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 29, no. 1, p. 93-98

Computer Science

22

Chondrites, Copper, Iron Alloys, Nickel Alloys, Abundance, Chondrule, Petrography, Meteorites, Stony Meteorites, Chondrites, Copper, Composition, Grains, Abundance, Shock Effects, Metal Phase, Petrography, Melting, Troilite, Kamacite, Data, Catalog, Iron Nickel, Origin, Formation, Distribution, Taenite, Partitioning, Nickel

Scientific paper

Metallic Cu of moderately high purity (approximately 985 mg/g Cu, approximately 15 mg/g Ni) occurs in at least 66% of ordinary chondrites (OC) as heterogeneously distributed, small (typically less than or equal to 20 micrometers) rounded to irregular grains. The mean modal abundance of metallic Cu in H, L and LL chondrites is low: 1.0 to 1.4 x 10-4 vol%, corresponding to only 4 - 5 % of the total Cu in OC whole rocks. In more than 75% of the metallic-Cu-bearing OC, at least some metallic Cu occurs at metallic-Fe-Ni-troilite grain boundaries. In some cases it also occurs within troilite, within metallic Fe-Ni, or at the boundaries these phases form with silicates or chromite. Ordinary chondrites that contain a relatively large number of occurrences of metallic Cu/sq mm have a tendency to have experienced moderately high degrees of shock. Shock processes can cause local melting and transportation of metallic Fe-Ni and troilte; because metallic Cu is mainly associated with these phases, it also gets redistributed during shock events. In the most common petrographic assemblage containing metallic Cu, the Cu is adjacent to small irregular troilite grains surrounded by taenite plus tetrataenite; this assemblage resembles fizzed troilite and may have formed by localized shock melting or remelting of a metal-troilite assemblage.

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