Other
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47.1199j&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 47, July 1983, p. 1199-1209.
Other
50
Iron Meteorites, Meteoritic Composition, Sulfur, Trace Elements, Chemical Fractionation, Cosmochemistry, Geochemistry, Magma, Meteorites, Iron Meteorites, Experiments, Trace Elements, Fractionation, Sulfur, Metals, Liquids, Partitioning, Siderophiles, Chalcophiles, Experiments, Fractional Crystallization, Models, Geochemistry, History, Evolution, Classification, Concentration, Procedure
Scientific paper
The partitioning of Ir, Ge, Ga, W, Cr, Au, P, and Ni between solid metal and metallic liquid is investigated as a function of temperature and the S-concentration of the metallic liquid. The partition coefficients for siderophile elements, such as Ir, W, Ga, and Ge, are found to increase by factors of 10-100 as the S-concentration of the metallic liquid increases from 0-30 wt percent. Partition coefficients for other siderophile elements, such as Ni, Au, and P, increase by factors of only 2-3. In contrast, a decrease is seen in the partition coefficients for the more chalcophile element Cr. These experimentally determined coefficients are used in conjunction with a fractional crystallization model to reproduce the geochemical behavior of Ni, P, Au, and Ir during the magmatic evolution of groups IIAB, IIIAB, IVA and IVB iron meteorites. The mean S-concentration for each group increases in the order IVB, IVA, IIIAB, IIAB, which is in accordance with cosmochemical prediction. However, the geochemical behavior of Ge, Ga, W, and Cr cannot be reproduced in an internally consistent way. It is concluded that the magmatic histories of these iron meteorite groups are more complex than has been generally assumed.
Drake Michael J.
Houston Jones Jane
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