Back Next Next
The Epigenetic Sediment-Hosted Serra Pelada Au-PGE Deposit and its Potential Genetic Association with Fe-oxide Cu-Au Mineralisation within the Carajás Mineral Province, Amazon Craton, Brazi
Christian Grainger, David I Groves, University of Western Australia, Perth, WA, Australia. Carlos H C Costa, Companhia Vale do Rio Doce, Parauapebas, PA, Brazil

in - Porter, T.M. (Ed), 2002 - Hydrothermal Iron Oxide Copper-Gold and Related Deposits: A Global Perspective, PGC Publishing, Adelaide, v. 2, pp 227-245.


   The Serra Pelada Au-PGE deposit is located within the Carajás Mineral Province of the southeastern Amazon Craton, Brazil. Gold-PGE ores are epigenetic and display a strong structural control, being hosted in sub-greenschist facies carbonaceous and calcareous metasiltstone, within the hinge zone of a reclined, tight, regional-scale F2 synform. Although the entire orebody has undergone deep tropical weathering, some evidence of the original hydrothermal alteration is preserved. Gold-PGE mineralization is associated with the formation of magnetite- and hematite-rich hydrothermal breccias, massive zones of hematite metasomatism, intense sericite (white mica)-kaolin metasomatism, siderite veining and a jasperoid envelope of amorphous silica alteration hosting rare disseminated pyrite. All other Au-PGE ore-related mineral assemblages have undergone intense weathering to hydrated Fe-oxides and secondary clay minerals, preventing further description of primary ore and alteration features. The geochemistry of the primary Au-PGE ores at Serra Pelada displays many similarities to that of Fe-oxide Cu-Au deposits within the Carajás Mineral Province, and indeed world-wide, in terms of metal association (e.g. Co, Ni, Cu, U), LREE enrichment and associated Fe-metasomatism. The Au-Pd-Pt association also suggests ore metal transport in acid, oxidizing, chloride-rich fluids, similar to those for Fe-oxide Cu-Au deposits. In combination with these similarities, and the location of the Serra Pelada Au-Pd-Pt deposit, it is suggested that the latter represents a distal equivalent to the Fe-oxide Cu-Au deposits and, as such, a target that may have been overlooked during exploration programs around such terrains globally.

Buy Top   |   PGC Publishing     |   PorterGeo Home

This book is NOW AVAILABLE FOR ORDER via the web by selecting the BUY button above.

This abstract was printed from the PGC Publishing website

PGC Logo
Porter GeoConsultancy Pty Ltd
 Ore deposit database
 Conferences & publications
 International Study Tours
     Tour photo albums
PGC Publishing
 Our books  &  bookshop
     Iron oxide copper-gold series
     Super-porphyry series
     Porphyry & Hydrothermal Cu-Au
 Ore deposit literature
 What's new
 Site map