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DISTINGUISHING HIGH- FROM LOW-TEMPERATURE PLATINUM NUGGETS THROUGH THEIR TRACE-ELEMENT PATTERN

Journal article
Authors A. R. Cabral
Thomas Zack
S. Konig
B. Eickmann
R. Kwitko-Ribeiro
M. Tupinamba
B. Lehmann
Canadian Mineralogist V. P. Ge T
Published in Economic Geology
Volume 114
Issue 2
Pages 201-206
ISSN 0361-0128
Publication year 2019
Published at Department of Earth Sciences
Pages 201-206
Language en
Links dx.doi.org/10.5382/econgeo.2019.462...
Keywords freetown layered complex, pt-fe nuggets, group minerals, minas-gerais, palladium, selenium, geochemistry, deposits, genesis, origin, Geochemistry & Geophysics, donough wf, 1995, chemical geology, v120, p223
Subject categories Earth and Related Environmental Sciences

Abstract

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.

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