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Palladium-oxygenated compounds of the Gongo Soco mine, Quadrilátero Ferrífero, central Minas Gerais, Brazil

Published online by Cambridge University Press:  05 July 2018

A. Raphael Cabral ,
B. Lehmann ,
R. Kwitko ,
R. D. Jones ,
F. R. M. Pires ,
O. G. Rocha Filho  and
M. D. Innocentini
A. Raphael Cabral*
Affiliation:
Institut für Mineralogie und Mineralische Rohstoffe, Technische Universität Clausthal, Adolph-Roemer-Str. 2A, D-38678 Clausthal-Zellerfeld, Germany
B. Lehmann
Affiliation:
Institut für Mineralogie und Mineralische Rohstoffe, Technische Universität Clausthal, Adolph-Roemer-Str. 2A, D-38678 Clausthal-Zellerfeld, Germany
R. Kwitko
Affiliation:
Centro de Desenvolvimento Mineral, Companhia Vale do Rio Doce, Rodovia BR 262 / km 296 – Caixa Postal 09, 33030-970 Santa Luzia-MG, Brazil
R. D. Jones
Affiliation:
1636 East Skyline Drive, Tucson, AZ 85178, USA
F. R. M. Pires
Affiliation:
Departamento de Geologia, Universidade Federal do Rio de Janeiro, Cidade Universitária, 21949-900 Rio de Janeiro-RJ, Brazil
O. G. Rocha Filho
Affiliation:
Mineração Socoimex Ltda., Fazenda Gongo Soco, Caixa Postal 42, 34800-000 Caeté-MG, Brazil
M. D. Innocentini
Affiliation:
Mineração Socoimex Ltda., Fazenda Gongo Soco, Caixa Postal 42, 34800-000 Caeté-MG, Brazil
*
*E-mail: cabral@min.tu-clausthal.de
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Abstract

New data on the Gongo Soco palladium-oxygenated compounds are presented for the first time since the work of Johnson and Lampadius (1837). A variety of PdO species is documented, always in association with Cu, Fe and Mn, and includes Pd(OH)2 or PdO.H2O, and phases with metal excess in relation to oxygen, interpreted as metastable. Their remarkable occurrence in ‘ouro preto’ (black gold) and jacutinga (auriferous itabirite/iron ore) is the result of mertieite-II alteration. It involves leaching of Sb and As, limited removal of Pd, and incorporation of Cu, Mn and Hg into PdO species. The locus of Hg-bearing PdO species in microfractures parallel to the enclosing gold-mineralized shear band suggests at least one low-temperature hydrothermal generation. The presence of a halite crystal attached to gold testifies to the involvement of Cl-saturated hydrothermal fluids in the oxidizing environment of jacutinga formation.

Keywords

PdO speciesmertieite-IIjacutinga‘ouro preto’Gongo SocoItabira Iron FormationQuadrilátero FerríferoBrazil
Type
Research Article
Information
Mineralogical Magazine , Volume 65 , Issue 2 , April 2001 , pp. 169 - 179
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2001

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