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Elements; August 2008; v. 4; no. 4; p. 233-238; DOI: 10.2113/GSELEMENTS.4.4.233
© 2008 Mineralogical Society of America
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Platinum-Group Elements in Cosmochemistry

Herbert Palme*

* Institut für Geologie und Mineralogie, Universität zu Köln
Zülpicherstrasse 49b, 50674 Köln, Germany
E-mail: herbert.palme{at}uni-koeln.de

In a cooling solar nebula, five of the six platinum-group elements (PGE) condense as refractory-metal alloys at temperatures above the condensation of Fe-Ni metal. Non-refractory Pd condenses in solid solution with Fe-Ni. Such refractory alloys are preserved in some meteorites, although they are often highly altered. The high resistance of PGE to oxidation leads to efficient extraction with metallic Fe-Ni during metal segregation and core formation. Experimentally determined PGE metal-silicate partition coefficients predict lower contents of PGE in planetary silicates than are found, supporting a late addition of PGE components. PGE are particularly useful as tracers of impacting extraplanetary materials in the strongly PGE-depleted crusts of the Earth and other planets.

KEYWORDS: refractory metal, meteoritic component, noble-metal solubility, Ir enrichment




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