We develop a comprehensive model to describe trace and minor element partitioning between sulphide liquids and anhydrous silicate liquids of approximately basaltic composition. We are able thereby to account completely for the effects of temperature and sulphide composition on the partitioning of Ag, Cd, Co, Cr, Cu, Ga, Ge, In, Mn, Ni, Pb, Sb, Ti, Tl, V and Zn. The model was developed from partitioning experiments performed in a piston-cylinder apparatus at 1.5 GPa and 1300 to 1700 °C with sulphide compositions covering the quaternary FeSNiSCuS0.5FeO.Partitioning of most elements is a strong function of the oxygen (or FeO) content of the sulphide. This increases linearly with the FeO content of the silicate melt and decreases with Ni content of the sulphide. As expected, lithophile elements partition more strongly into sulphide as its oxygen content increases, while chalcophile elements enter sulphide less readily with increasing oxygen. We parameterised the effects by using the ε-model of non-ideal interactions in metallic liquids. The resulting equation for partition coefficient of an element M between sulphide and silicate liquids can be expressed aslogDMsulph/sil=A+BT−n2log[FeO]corr+1673T[εMSn/2FeOlog(1−xFeO)+εMSn/2NiSlog(1−xNiS)+εMSn/2CuS0.5log(1−xCuS0.5)]
Ekaterina S. Kiseeva,,Bernard J. Wood. The effects of composition and temperature on chalcophile and lithophile element partitioning into magmatic sulphides[J]. Earth and Planetary Science Letters,2015-01-01,Volume 424