Abstract
Samples of spinel from three different environments in the Vourinos ophiolitic complex were analysed for the platinum-group elements (PGE) Os, Ir, Ru, Pd, Pt and Au. Chondrite-normalized PGE patterns of both spinels from dunites and massive chromites are characterized by high Os, Ir and Ru normalized values as compared to the low Pd and Pt values, whereas spinels from harzburgite have nearly chondritic patterns. The bulk chemistry of Os-Ir-Ru of spinels from dunites and chromitites reflects the composition of the platinum-group minerals (PGM) trapped in the spinels. The analysed PGE, mostly Pd and Pt, in spinels from harzburgites are considered to be trapped at grain boundaries as sulfides. The geochemical behaviour of the PGE during partial melting and crystallization is used in order to define the conditions of formation of chromitites and/or PGE concentrations.
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