Platinum Group Elements

Some rare metals known as platinum group elements (PGEs) form economic concentrations in some ultra-mafic igneous rocks and take several forms. Chro-mite may occur as layers, typically in continental intrusions or as small pods in ultramafic rock associations. Chromite and platinum group elements are typically associated with sulfide minerals and form when there is enough sulfur in the magma to crystallize these phases while the rock is still in liquid forms. In many cases the metal phases are a result of contamination of the magma by melted country rock, particularly in the continental layered intrusions. Examples of large economic deposits of chro-mite are found in the Bushveld Complex in South Africa, and the Muskox and Stillwater Complexes of North America.

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