A Model for the Origin of the Platinum-Rich Sulfide Horizons in the Bushveld and Stillwater Complexes

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Abstract
The sulfides of the Merensky Reef and the UG–2 chromite seam of the Bushveld Complex and the H.P. Reef of the Stillwater Complex have concentrated platinum group elements (PGE) with remarkable efficiency. Attempts to model these sulfides have exposed two major problems: (i) very high Nernst distribution coefficients (D) are required and (ii) a mass balance problem.