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The Serra Pelada Au-Pd-Pt Deposit, Carajas, Brazil: Geochemistry, Mineralogy, and Zoning of Hydrothermal Alteration

2014; Volume: 109; Issue: 7 Linguagem: Inglês

10.2113/econgeo.109.7.1883

1554-0774

Gabriel V. Berni, Christoph A. Heinrich, Lydia Maria Lobato, V. J. Wall, Carlos Alberto Rosière, Marco Antônio de Freitas,

Geochemistry and Elemental Analysis

Research Article| November 01, 2014 The Serra Pelada Au-Pd-Pt Deposit, Carajás, Brazil: Geochemistry, Mineralogy, and Zoning of Hydrothermal Alteration* Gabriel V. Berni; Gabriel V. Berni † 1Institute of Geochemistry and Petrology, Department of Earth Sciences, ETH Zürich, Clausiusstrasse, 25, NW F 82.1, 8092, Zürich, Switzerland †Corresponding author: e-mail, gabriel.berni@erdw.ethz.ch Search for other works by this author on: GSW Google Scholar Christoph A. Heinrich; Christoph A. Heinrich 1Institute of Geochemistry and Petrology, Department of Earth Sciences, ETH Zürich, Clausiusstrasse, 25, NW F 82.1, 8092, Zürich, Switzerland2Also at: Faculty of Mathematics and Natural Sciences, University of Zürich Search for other works by this author on: GSW Google Scholar Lydia M. Lobato; Lydia M. Lobato 3Centro de Pesquisa Manoel Teixeira da Costa, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Belo Horizonte, Brazil Search for other works by this author on: GSW Google Scholar Victor J. Wall; Victor J. Wall 4Colossus Minerals Inc., The Exchange Tower, 130 King Street West, Suite 2500, Toronto, Ontario, Canada M5X 1A9 Search for other works by this author on: GSW Google Scholar Carlos A. Rosière; Carlos A. Rosière 3Centro de Pesquisa Manoel Teixeira da Costa, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Belo Horizonte, Brazil Search for other works by this author on: GSW Google Scholar Marcelo A. Freitas Marcelo A. Freitas 4Colossus Minerals Inc., The Exchange Tower, 130 King Street West, Suite 2500, Toronto, Ontario, Canada M5X 1A9 Search for other works by this author on: GSW Google Scholar Author and Article Information Gabriel V. Berni † 1Institute of Geochemistry and Petrology, Department of Earth Sciences, ETH Zürich, Clausiusstrasse, 25, NW F 82.1, 8092, Zürich, Switzerland Christoph A. Heinrich 1Institute of Geochemistry and Petrology, Department of Earth Sciences, ETH Zürich, Clausiusstrasse, 25, NW F 82.1, 8092, Zürich, Switzerland2Also at: Faculty of Mathematics and Natural Sciences, University of Zürich Lydia M. Lobato 3Centro de Pesquisa Manoel Teixeira da Costa, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Belo Horizonte, Brazil Victor J. Wall 4Colossus Minerals Inc., The Exchange Tower, 130 King Street West, Suite 2500, Toronto, Ontario, Canada M5X 1A9 Carlos A. Rosière 3Centro de Pesquisa Manoel Teixeira da Costa, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Belo Horizonte, Brazil Marcelo A. Freitas 4Colossus Minerals Inc., The Exchange Tower, 130 King Street West, Suite 2500, Toronto, Ontario, Canada M5X 1A9 †Corresponding author: e-mail, gabriel.berni@erdw.ethz.ch Publisher: Society of Economic Geologists Received: 04 Mar 2013 Accepted: 11 Feb 2014 First Online: 09 Mar 2017 Online ISSN: 1554-0774 Print ISSN: 0361-0128 © 2014 Society of Economic Geologists. Economic Geology (2014) 109 (7): 1883–1899. https://doi.org/10.2113/econgeo.109.7.1883 Article history Received: 04 Mar 2013 Accepted: 11 Feb 2014 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Gabriel V. Berni, Christoph A. Heinrich, Lydia M. Lobato, Victor J. Wall, Carlos A. Rosière, Marcelo A. Freitas; The Serra Pelada Au-Pd-Pt Deposit, Carajás, Brazil: Geochemistry, Mineralogy, and Zoning of Hydrothermal Alteration. Economic Geology 2014;; 109 (7): 1883–1899. doi: https://doi.org/10.2113/econgeo.109.7.1883 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyEconomic Geology Search Advanced Search Abstract The Serra Pelada Au-Pd-Pt deposit is located within the Carajás mineral province, which also hosts the world-class iron ore and iron oxide-hosted copper-gold deposits of the Amazon craton in Brazil. The unusual low-temperature hydrothermal mineralization at Serra Pelada is epigenetic, hosted by metasedimentary rocks of the Águas Claras Formation and structurally localized in the Serra Pelada overturned syncline. The orebodies are controlled by the intersection of subvertical NE-trending fault zones with metasiltstones, mainly at the syncline's hinge, with minor ore occurrences at the upper and lower limb. Intense tropical weathering over the last 70 m.y. has completely overprinted the shallow ore in and near the flooded open pit, but primary hydrothermal features are preserved in deeper drill core delineating the remaining resource. Gold, platinum, and palladium mineralization is associated with intense argillic alteration, hematite breccias, and silicification, with the highest grade ore hosted by brecciated metasiltstones that are highly enriched in amorphous carbon. Distal alteration zones comprise a reducing and oxidizing alteration front. The hydrothermal mineral paragenesis comprises kaolinite, quartz, sericite, amesite (Mg-rich Al-silicate), amorphous carbon, hematite, monazite, rutile, pyrite, and a complex assemblage of Bi-, Ag-, Pb-, Cu-, Co-, Ni-, Pt-, Pd-, and Au-bearing, chalcogenide (S, Se), and arsenide (As, Sb) minerals. Major element changes during hydrothermal alteration include C and Mg addition, K depletion, localized silica loss, and silicification with notable introduction of trace elements including light rare earth elements (LREE), Bi, Pb, U, V, Cu, Co, Ni, and As. The hydrothermal alteration and element association of the Serra Pelada deposit show geochemical similarities with unconformity-related uranium deposits, which may also be enriched in Au, Pd, and Pt and were formed by mixing of fluids that interacted with a highly oxidized cover sequence and highly reduced rock packages in structures of brittle-ductile strain. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.