Copper and nickel partitioning in iron meteorites

Details Copper and nickel partitioning in iron meteorites Copper and nickel partitioning in iron meteorites

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.2653s&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 51, Oct. 1987, p. 2653-2662.

Computer Science

7

Copper, Iron Meteorites, Meteoritic Composition, Nickel, Trace Elements, Spherules, Synchrotron Radiation, Troilite, X Ray Fluorescence, Meteorites, Iron Meteorites, Partitioning, Copper, Nickel, X-Ray Methods, Pixe, Fluorescence, Sxrf, Trace Elements, Samples, Meteorite, Metal, Troilite, Distribution, Composition, Chemistry, Equilibration, Origin, Formation, Laboratory Studies, Procedure, Canyon Diablo, Gladstone, Wichita County, Four Corners, Ainsworth, Cape York, Gibeon, Carlton, San Cristobal, Iab Irons

Scientific paper

Trace element analyses using proton induced X-ray emission and synchrotron X-ray fluorescence have been made on metal and troilite from nine iron meteorites representing five geochemical groups. Nickel and copper distribution coefficients D (troilite/metal) vary by factors of 600 and 20, respectively, correlate positively with kamacite bandwidth and correlate negatively with bulk nickel content. Meteorites with bulk Ni of less than 10 percent have Cu-enriched troilite while those with Ni greater than 10 percent have Cu-depleted troilite. Since magmatic evolution and partial melting will produce Cu-enriched troilite only, the observation of Cu-depleted troilite in Ni-rich meteorites is evidence for subsolidus reequilibration, a process which reduces D(Cu) by transfer of Cu to exsolving metal. Elemental redistribution may have played an important role in establishing the present chemical trends in iron meteorites.

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