Platinum Group Minerals in the Basic to Ultrabasic Complex of the Sierras de San Luis, Argentina.

HAUZENBERGER, CH; MOGESSIE, A; HOINKES, G; BJERG, E A; KOSTADINOFF, J; DELPINO, S; DIMIERI, L

Mineral Deposits: Research and Exploration- Where do tehy meet

Balkema Publishers

Lugar: Brookfield; Año: 1997; p. 439 - 442

Basic to ultrabasic rocks occur as intercalated bodies in a granulite facies basement. Both granulite facies units were partly retrograded to amphibolite facies conditions and deformed by a mylonite zone. Mineralization of platinum group minerals is restricted to the occurrence of spinel and massive base-metal sulfides in basic to ultrabasic rocks. PtAs2 and PdBiTe were formed by crystallization of a seperated sulfide magma. IrRhSAs, PdBiTe, and PtAs2 were remobilized locally by an infiltrated fluid leading to a second stage in platinum group mineral formation. Furthermore, (Re,Mo)S2 and MoS2 were formed by this later stage of mineralization that probably is related to the mylonitization.