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Article Dans Une Revue Geochimica et Cosmochimica Acta Année : 2014

The solubility of platinum in silicate melt under reducing conditions: Results from experiments without metal inclusions

Résumé

The solubility of Pt in silicate melt was investigated at conditions of 2073–2573 K, 2 GPa and ∼IW −1.5 to +3.5. These are the first measurements of Pt solubility under conditions more reducing than the iron-wüstite buffer (IW) which are demonstrably free from contamination by metal-inclusions. Pt solubility increases with increasing temperature and decreasing oxygen fugacity. The ability of carbon to enhance Pt solubility under reducing conditions (3500 K. Under these conditions however, the estimated Pt/Os ratio is ∼40,000 times higher than that estimated for the PUM ( Brandon et al., 2006). Instead, the PUM composition is generated most readily by metal–silicate equilibrium at more modest temperatures (∼3100 K), followed by a late accretion of chondritic material subsequent to core formation.

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Pétrographie
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Dates et versions

hal-01132075 , version 1 (16-03-2015)

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N.R. Bennett, J.M. Brenan, Kenneth T. Koga. The solubility of platinum in silicate melt under reducing conditions: Results from experiments without metal inclusions. Geochimica et Cosmochimica Acta, 2014, 133, pp.422-442. ⟨10.1016/j.gca.2014.02.046⟩. ⟨hal-01132075⟩
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