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Experiments were performed to establish the stability limits and mineral - sulfide melt partitioning behavior of the platinum- group minerals laurite (Ru,Os,Ir)S 2 and Ru-Os-Ir alloy as functions of temperature and sulfur fugacity. Ruthenium-doped ex- periments yielded laurite up to ~1275 °C at log f(S2) of -2.0, with laurite replaced by Ru alloy at higher temperature. Similar results were observed at log f(S2) of -2 and -1.3 for compositions doped with multiple PGE, except that Ru-Os-Ir alloy coexisted with laurite at T ≤ 1265°C. Laurite and alloy from these latter experiments were found to be Ru-Os-Ir-rich and Pt-Pd-poor, with grains of alloy containing more Os and Ir than laurite, and both phases becoming (Os + Ir)-rich with increasing f(S2). Concentra- tions of PGE in sulfide liquid saturated with laurite ± alloy were found to be: Ru: 1-13 wt%; Os and Ir: ≤ 0.6 wt%; Pt and Pd: 0.5- 4 wt%. The finding that laurite and Ru-Os-Ir alloy are stable at chromian-spinel-based liquidus temperatures indicates that the commonly observed inclusion of these phases in chromian spinel can be interpreted as a primary magmatic texture. High solubilities for Ru in molten sulfide, combined with low intrinsic abundances of the PGE in igneous rocks, suggest that crystal - lization of laurite or Ru-Os-Ir alloy in the presence of immiscible sulfide liquid is unlikely. Thus, the extent to which PGE- bearing accessory minerals will affect the final distribution of the PGE within an igneous body may be strongly linked to when, or if, saturation in sulfide liquid occurs.

HIGH-TEMPERATURE STABILITY OF LAURITE AND Ru Os Ir ALLOY AND THEIR ROLE IN PGE FRACTIONATION IN MAFIC MAGMAS