“…Although extensive early experimental work in binary and ternary subsystems of the Ni-Cu-Fe-S-O system established the basic topology of most of the important phase boundaries (Craig and Kullerud, 1969, and references therein;Naldrett, 1969), the complexity of the five-component system complicates simple graphical approaches to understanding the phase equilibria, and recent attention has been focussed on the measurement of coexisting phase compositions in quenching experiments (Fleet et al, 1993;Fleet and Pan, 1994;Ballhaus et al, 2001;Li et al, 1996;Naldrett, 1996, 1997;Kosyakov and Sinyakova, 2005). Several other studies have been conducted in various systems including some of the components Ni, Cu, Fe, S and O in addition to other major element components, especially the PGE (Fleet and Stone, 1991;Barnes et al, 2001;Sinyakova et al, 1996;Sugaki and Kitakaze, 1998;Makovicky, 2002;Peregoedova and Ohnenstetter, 2002). Attempts to apply thermodynamic solution models have been limited to superliquidus conditions in the system Fe-S-O (Kress, 1997).…”