Trace and platinum-group element geochemistry and the development of the Merensky unit of the Western Bushveld complex |
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| Authors: | Lee C A |
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| Institution: | (1) Fundamental Research Unit, Johannesburg Consolidated Investment Co., Randfontein, South Africa |
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| Abstract: | Whole-rock samples of the Merensky Unit were analysed for major elements, Cu, Ni, Cr, Co, Eu, Th, U, Cs, and the platinum-group elements Pt, Pd, Rh, Ir and Au. There is a sympathetic variation of Cu, Ni, Co, and S throughout the sequence. Th and U abundances are highest around the Merensky Reef, and their distribution in the rest of the unit reflects the amount of mesostasis. Eu distribution is governed by primary plagioclase. Pt, Pd, Rh, Ir and Au (PM) are concentrated in the Merensky Reef. The relative proportions throughout the unit are IrAu2 enrichment trends; interaction of these trends resulted in the Merensky Reef and its attendant mineralization. |
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