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Érika Suellen Barbosa Santiago

Universidade Estadual de Campinas (UNICAMP)

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Lena Virgínia Soares Monteiro

Universidade de São Paulo

Roberto Perez Xavier

Universidade Estadual de Campinas (UNICAMP)

Carolina Penteado Natividade Moreto

Universidade Estadual de Campinas (UNICAMP)

Gustavo Henrique Coelho de Melo

Pontifical Catholic University of Rio de Janeiro

Caetano Juliani

Instituto de Geociencias

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Ângela Suélem Rocha Veloso

Universidade Federal de Uberlândia

Gustavo H. C. deMelo

Universidade Estadual de Campinas (UNICAMP)

Soraya Damasceno Sousa

Universidade de São Paulo

Benevides Aires

Universidade Federal do Pará

Raimundo Netuno Villas

Universidade Federal do Pará

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Universidade de São Paulo

Universidade Estadual de Campinas (UNICAMP)

Instituto de Geociencias

Universidade Federal do Pará

ThermoAnalytics (United States)

Universidade Federal de Ouro Preto

University of Western Australia

ARC Centre of Excellence for Core to Crust Fluid Systems

Australian Research Council

Universidade Cidade de São Paulo

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Multiple sulfur isotopes constraints on origin and evolution of the Neoarchean and Paleoproterozoic Cu-Au systems from the Carajás Domain, Amazonian Craton, Brazil

Ore Geology Reviews (2020)

Érika Suellen Barbosa Santiago Roberto Perez Xavier Steffen Hagemann Lena Virgínia Soares Monteiro John Cliff

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Mass-independent fractionation

10.1016/j.oregeorev.2020.103872

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Citations (7)

The Tocantinzinho gold deposit, Tapajós province, state of Pará: host granite, hydrothermal alteration and mineral chemistry

Brazilian Journal of Geology (2013)

Érika Suellen Barbosa Santiago Raimundo Netuno Villas Ruperto Ocampo

This paper presents geological, petrographic and mineralogical data about the granite that hosts the Tocantinzinho gold deposit and aimed at contributing to the understanding of the hydrothermal processes related to the ore genesis.The host granite is a late to post-tectonic biotite monzogranite that fits in the oxidized sub-type of the ilmenite series.It was emplaced at depths of 6 -9 km and reveals no deformation other than fracturing and brecciation.This intrusion has undergone mild to moderate hydrothermal alteration that generated two main rock varieties (salami and smoky), with no significant mineralogical or chemical differences, though quite distinct macroscopically.Several types of hydrothermal alteration have been recognized in the granitic rocks, greatly represented by filling veins and/or replacement of primary minerals.The hydrothermal history started with microclinization, during which the granitic protolith was in part transformed into the salami variety.This process was followed by chloritization when the temperature dropped to ~330 ºC producing chamosite with X Fe in the 0.55 -0.70 range.Then it evolved to sericitization, at the same time that ore-bearing fluids precipitated pyrite, chalcopyrite, sphalerite, galena and gold.As alteration advanced, solutions saturated in silica and formed quartz veinlets.At the latest stage (carbonatization), aqueous and aqueous-carbonic fluids might have mixed, allowing Ca 2+ e CO 2 to react to form calcite.Most sulfides are present in veinlets that crosscut the granite, some arranged as stockwork.Gold is normally very fine-grained and occurs mainly as submicroscopic inclusions or along microfractures in pyrite and quartz.The Tocantinzinho deposit is very similar to the Batalha, Palito and São Jorge deposits, and to those of the Cuiú-Cuiú goldfield.Topologically, it has been classed as an intrusion-related gold deposit.

Mineral deposit

10.5327/z2317-48892013000100015

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Citations (11)

Tracing Fluid Sources for the Salobo and Igarapé Bahia Deposits: Implications for the Genesis of the Iron Oxide Copper-Gold Deposits in the Carajás Province, Brazil

Economic Geology (2019)

Gustavo Henrique Coelho de Melo Lena Virgínia Soares Monteiro Roberto Perez Xavier Carolina Penteado Natividade Moreto Érika Suellen Barbosa Santiago

Research Article| June 01, 2019 Tracing Fluid Sources for the Salobo and Igarapé Bahia Deposits: Implications for the Genesis of the Iron Oxide Copper-Gold Deposits in the Carajás Province, Brazil Gustavo H.C. de Melo; Gustavo H.C. de Melo 1 Department of Geology, Federal University of Ouro Preto (UFOP), Morro do Cruzeiro-Campus Morro Do Cruzeiro, s/n - Bauxita, 35400-000 Ouro Preto, Minas Gerais, Brazil † Corresponding author: e-mail, gustavo.melo@ufop.edu.br Search for other works by this author on: GSW Google Scholar Lena V.S. Monteiro; Lena V.S. Monteiro 1 Department of Geology, Federal University of Ouro Preto (UFOP), Morro do Cruzeiro-Campus Morro Do Cruzeiro, s/n - Bauxita, 35400-000 Ouro Preto, Minas Gerais, Brazil Search for other works by this author on: GSW Google Scholar Roberto P. Xavier; Roberto P. Xavier 3 Institute of Geosciences, University of Campinas (UNICAMP), R. João Pandiá Calógeras, 51, 13083-870 Campinas, São Paulo, Brazil Search for other works by this author on: GSW Google Scholar Carolina P.N. Moreto; Carolina P.N. Moreto 3 Institute of Geosciences, University of Campinas (UNICAMP), R. João Pandiá Calógeras, 51, 13083-870 Campinas, São Paulo, Brazil Search for other works by this author on: GSW Google Scholar Erika Santiago Erika Santiago 2 Institute of Geosciences, University of São Paulo (USP), Rua do Lago, 562, 05508-080 São Paulo, São Paulo, Brazil Search for other works by this author on: GSW Google Scholar Author and Article Information Gustavo H.C. de Melo 1 Department of Geology, Federal University of Ouro Preto (UFOP), Morro do Cruzeiro-Campus Morro Do Cruzeiro, s/n - Bauxita, 35400-000 Ouro Preto, Minas Gerais, Brazil Lena V.S. Monteiro 1 Department of Geology, Federal University of Ouro Preto (UFOP), Morro do Cruzeiro-Campus Morro Do Cruzeiro, s/n - Bauxita, 35400-000 Ouro Preto, Minas Gerais, Brazil Roberto P. Xavier 3 Institute of Geosciences, University of Campinas (UNICAMP), R. João Pandiá Calógeras, 51, 13083-870 Campinas, São Paulo, Brazil Carolina P.N. Moreto 3 Institute of Geosciences, University of Campinas (UNICAMP), R. João Pandiá Calógeras, 51, 13083-870 Campinas, São Paulo, Brazil Erika Santiago 2 Institute of Geosciences, University of São Paulo (USP), Rua do Lago, 562, 05508-080 São Paulo, São Paulo, Brazil † Corresponding author: e-mail, gustavo.melo@ufop.edu.br Publisher: Society of Economic Geologists Accepted: 30 Jan 2019 First Online: 24 Jun 2019 Online Issn: 1554-0774 Print Issn: 0361-0128 © 2019 Economic GeologyEconomic Geology Economic Geology (2019) 114 (4): 697–718. https://doi.org/10.5382/econgeo.4659 Article history Accepted: 30 Jan 2019 First Online: 24 Jun 2019 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Gustavo H.C. de Melo, Lena V.S. Monteiro, Roberto P. Xavier, Carolina P.N. Moreto, Erika Santiago; Tracing Fluid Sources for the Salobo and Igarapé Bahia Deposits: Implications for the Genesis of the Iron Oxide Copper-Gold Deposits in the Carajás Province, Brazil. Economic Geology 2019;; 114 (4): 697–718. doi: https://doi.org/10.5382/econgeo.4659 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 Salobo and Igarapé Bahia iron oxide copper-gold (IOCG) deposits stand out as economically important deposits in the Carajás Province. Whereas granitoids and gneisses host the Neoarchean Salobo deposit, the Igarapé Bahia deposit occurs in volcanic rocks and associated sedimentary sequences. Paragenetic evolution of the IOCG alteration-mineralization evidences higher temperature conditions at Salobo (almandine-grunerite-biotite-magnetite) than at Igarapé Bahia (tourmaline-carbonate-magnetite-chlorite). At Salobo, iron enrichment at 565° ± 50°C was accompanied by hydrothermal fluids with magmatic or metamorphic compositions, as evidenced by grunerite (δ18OH2O = 7.20–8.50‰, δDH2O = −25.33 to −16.01‰), garnet (δ18OH2O = 7.10–9.70‰), and tourmaline (δ18OH2O = 5.07–7.37‰, δDH2O = −32.13 to +11.60‰). Fluids associated with potassic alteration at 565° ± 50°C also have a typical magmatic/metamorphic composition, indicated by biotite (δ18OH2O = 7.23–8.03‰, δDH2O = −40.94 to −25.94‰) and quartz (δ18OH2O = 7.52‰). Sulfur isotope signatures for chalcopyrite (0.81–1.28‰) and bornite (−0.37 to + 1.63‰) suggest a magmatic sulfur source at Salobo. For the Igarapé Bahia deposit, fluids associated with tourmaline display magmatic or metamorphic signatures (δ18OH2O = 5.07–7.37‰, δDH2O = −34.02 to −19.74‰, at 330° ± 50°C), but those associated with calcite (δ18OH2O = 1.68–3.10‰, 330° ± 50°C) and chlorite (δ18OH2O = 1.92–3.20‰, δDH2O = −57.36 to –21.34‰, 255° ± 50°C) evidence the input of 18O-depleted fluids. δ13CCO2 values (−9.32 to −4.93‰) for fluids in equilibrium with calcite also imply magmatic sources. Our data indicate that the main source of the ore-forming fluids for Salobo was derived from exsolved magmatic brines associated with crystallization of the coeval ca. 2.5 Ga granites. In contrast, though the early fluids at Igarapé Bahia were also magmatic-hydrothermal, the influx of 18O-depleted formation water was prominent during the later stages of ore genesis. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

10.5382/econgeo.4659

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Citations (24)

IOCG deposits of the Carajás Province: footprints of archean and paleoproterozoic sydrothermal systems

Anais (2014)

Lena Virgínia Soares Monteiro Carolina Penteado Natividade Moreto Roberto Perez Xavier Gustavo Henrique Coelho de Melo M. A. Delinardo da Silva

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Temporal evolution of the giant Salobo IOCG deposit, Carajás Province (Brazil): constraints from paragenesis of hydrothermal alteration and U-Pb geochronology

Mineralium Deposita (2016)

Gustavo H. C. deMelo Lena Virgínia Soares Monteiro Roberto Perez Xavier Carolina Penteado Natividade Moreto Érika Suellen Barbosa Santiago