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Mineralogical Magazine; April 2002; v. 66; no. 2; p. 327-336; DOI: 10.1180/0026461026620033
© 2002 Mineralogical Society of Great Britain and Ireland
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Palladseite and its oxidation: evidence from Au-Pd vein-type mineralization (jacutinga), Cauê iron-ore mine, Quadrilátero Ferrífero, Minas Gerais, Brazil

A. R. Cabral1,*, B. Lehmann1, R. Kwitko2, H. F. Galbiatti3 and M. C. Pereira3

1 Institut für Mineralogie und Mineralische Rohstoffe, Technische Universität Clausthal, Adolph-Roemer-Str. 2A, D-38678 Clausthal-Zellerfeld, Germany
2 Centro de Desenvolvimento Mineral, Companhia Vale do Rio Doce, Rodovia BR 262 /km 296 –Caixa Postal 09, 33030-970 Santa Luzia-MG, Brazil
3 Diretoria de Metais Nobres, Companhia Vale do Rio Doce, 35900-900 Itabira-MG, Brazil

* E-mail: cabral{at}min.tu-clausthal.de

Palladseite (palladium selenide) and palladian gold occur as euhedral inclusions in specularite and as infill of microfractures and interstices in magnetite aggregates (host rock fragments) within specularite-rich auriferous veins (jacutinga). Palladseite has minor amounts of Pt (0.6–3.5 wt.%), Cu (2.9–3.5 wt.%), Hg (0.9–1.9 wt.%), and Ag (0.3–0.5 wt.%). The palladian gold contains up to 6 wt.% Pd, and minor Cu and Ag. Isomertieite (Pd11Sb2As2) and sudovikovite (PtSe2) are also recorded. The veins cross-cut the main tectonic foliation of the wallrock (itabirite). The feature of fracture infill and the Se-Sb-As-Hg-Cu-Ag geochemical/mineralogical signature of the Au-Pd mineralization point to a post-ductile deformation and possibly low-temperature (epithermal) origin of the jacutinga mineralization style.

Palladseite is replaced locally by a Pd-rich oxidation phase. Electron microprobe analysis of alteration halos around palladseite yields 76–80 wt.% Pd. Oxygen calculated by stoichiometry accords with a monoxide compound of the type PdO. However, the measured oxygen content is lower than expected for the PdO stoichiometry, suggesting loss of volatile species, and a more ‘hydrated’ compound, such as an oxyhydroxide.

KEYWORDS: palladseite alteration, Pd-O species, palladian gold, sudovikovite, jacutinga, Cauê iron-ore mine, Itabira Iron Formation, Quadrilátero Ferrífero, Brazil




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