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Distinguishing high- From lowerature platinum nuggets through their trace-element pattern

Journal article
Authors A. R. Cabral
Thomas Zack
S. König
B. Eickmann
R. Kwitko-Ribeiro
M. Tupinambá
B. Lehmann
Published in Economic Geology
Volume 114
Issue 2
Pages 206
ISSN 0361-0128
Publication year 2019
Published at Department of Earth Sciences
Pages 206
Language - English
Links doi.org/10.5382/econgeo.2019.4627
Subject categories Earth and Related Environmental Sciences

Abstract

High- and lowerature platinum nuggets from two historical localities, Chocó in Colombia and Córrego Bom Sucesso in Brazil, are compared with respect to trace elements. Supergene platinum nuggets from Córrego Bom Sucesso are enriched in Se and Hg, but depleted in siderophile and chalcophile elements, and have fractionated platinum group element patterns, in comparison with magmatic platinum nuggets from Chocó. In particular, Se concentrations over ∼100 g/g Se and S/Se ratios above unity indicate Se recycling in a supergene environment with abundant organic matter. © 2019 Society of Economic Geologists; Economic Geology.

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