Distinguishing High- from Low-Temperature Platinum Nuggets Through Their Trace-Element Pattern

High- and low-temperature platinum nuggets from two historical localities, Choco in Colombia and Corrego Born Sucesso in Brazil, are compared with respect to trace elements. Supergene platinum nuggets from Corrego Bom Sucesso are enriched in Sc and Hg, but depleted in siderophile and chalcophile elements, and have fractionated platinum group element patterns, in comparison with magmatic platinum nuggets from Choco. In particular, Se concentrations over similar to 100 mu g/g Se and S/Se ratios above unity indicate Se recycling in a supergene environment with abundant organic matter.