Experimental constraints on the partitioning of Ru, Rh, Ir, Pt and Pd between chromite and silicate melt: The importance of ferric iron

We have performed partitioning experiments to assess the role of chromium-rich spinel in controlling the behavior of the platinum-group elements (PGEs) during igneous differentiation. Spinels were equilibrated with natural and synthetic iron-bearing basalt at 0.1MPa and 2GPa at 1400–1900°C over an f...

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Bibliographic Details
Published in:Chemical geology 2012-04, Vol.302-303, p.16-32
Main Authors: Brenan, James M., Finnigan, Craig F., McDonough, William F., Homolova, Veronika
Format: Article
Language:English
Subjects:
basalt
Chromite
chromium
energy
Ferric iron
graphene
iron
melting
mineral content
Mineral/melt partitioning
partition coefficients
Platinum-group elements
Spinel
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Summary:We have performed partitioning experiments to assess the role of chromium-rich spinel in controlling the behavior of the platinum-group elements (PGEs) during igneous differentiation. Spinels were equilibrated with natural and synthetic iron-bearing basalt at 0.1MPa and 2GPa at 1400–1900°C over an fO2 range of IW+1.6 to IW+7. Results from relatively reduced, graphite-encapsulated experiments done at 2GPa indicate that Ru is compatible in Cr-spinel (mineral/melt partition coefficient, D, of ~4), followed by Rh and Ir, which are moderately incompatible (D range of 0.04 to ~1), with Pt and Pd the most incompatible (D
ISSN:0009-2541
1872-6836
DOI:10.1016/j.chemgeo.2011.05.015