U–Pb SHRIMP and Sm–Nd geochronology of granite–gneiss complexes and implications for the evolution of the Central Brazil Archean Terrain

Queiroz, Cláudia; Jost, Hardy; Silva, Luiz Carlos da; McNaughton, Neal J.

doi:10.1016/j.jsames.2007.07.007

Cited by 31 publications

(52 citation statements)

References 19 publications

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“…3.0 Ga. The U-Pb discordias presented by Queiroz et al (2008) show patterns indicating strong Neoproterozoic Pb loss.…”

Section: Goiás Archaean Blockmentioning

confidence: 94%

“…It underlies an area of about 18,000 km 2 ( Fig. 2) and consists of typical Archean TTG granite-gneiss complexes (Queiroz et al 2008, Jost et al 2013, and narrow greenstone belt sequences (Fortes et al 1995, Tassinari et al 2006, Santos et al 2008, Jost et al 2010. The granite-gneiss terrains comprise orthogneisses which, in the northern portion of the terrain, comprise the Anta, Caiamar, Moquém and Hidrolina, and, in the south, the Caiçara and Uvá complexes.…”

Section: Goiás Archaean Blockmentioning

confidence: 99%

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The tectonic evolution of the Neoproterozoic Brasília Belt, central Brazil: a geochronological and isotopic approach

Pimentel

2016

Braz. J. Geol.

102

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ABSTRACT:The Brasília Belt is one of the most complete Neoproterozoic orogens in western Gondwana. Rapid progress on the understanding of the tectonic evolution of the belt was achieved due to new U-Pb data, combined with Sm-Nd and Lu-Hf analyses. The evolution of the Brasília orogen happened over a long period of time (900 -600 Ma) involving subduction, magmatism and terrain accretion, as a result of the consumption of the Goiás oceanic lithosphere. Provenance studies, based on U-Pb zircon data, indicate that the sedimentary rock units record different tectonic settings and stages of the evolution of the orogen. The Paranoá and Canastra groups represent passive margin sequences derived from the erosion of the São Francisco Craton. The Araxá and Ibiá groups, however, have dominant Neoproterozoic detrital zircon populations, as young as 650 Ma, suggesting derivation from the Goiás Magmatic Arc. The Goiás Magmatic Arc represents a composite arc terrain, formed by the accretion of older (ca. 0.9 -0.8 Ga) intraoceanic island arc(s), followed by more evolved continental arcs. It extends for several thousand kilometers, from SW Goiás, through NE Brazil and into Africa. Metamorphism took place between 650 -630 Ma reflecting final closure of the Goiás Ocean and continental collision. KEYWORDS: Brasília Belt; Neoproterozoic; U-Pb geochronology; Sediment provenance. RESUMO: A Faixa Brasília é um dos mais completos orógenos Neoproterozoicos no Gondwana Ocidental. Durante os últimos dez anos, o rápido progresso no entendimento da evolução tectônica desse orógeno foi proporcionado pela produção de novos dados geocronológicos U-Pb SHRIMP e LA-ICPMS, combinados com análises Sm-Nd e Lu-Hf. Os dados demonstraram que a evolução da Faixa Brasília acontenceu ao longo de um prolongado intervalo de tempo (900 -600 Ma), envolvendo subducção, atividade ígnea e acreção de terrenos, como resultado do consumo da litosfera do oceano Goiás. Estudos de proveniência de sedimentos baseados em geocronologia U-Pb de minerais detríticos indicam que as unidades sedimentares da Faixa

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“…3.0 Ga. The U-Pb discordias presented by Queiroz et al (2008) show patterns indicating strong Neoproterozoic Pb loss.…”

Section: Goiás Archaean Blockmentioning

confidence: 94%

Section: Goiás Archaean Blockmentioning

confidence: 99%

The tectonic evolution of the Neoproterozoic Brasília Belt, central Brazil: a geochronological and isotopic approach

Pimentel

2016

Braz. J. Geol.

102

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“…The study area is located within the ArcheanPaleoproterozoic Terrane of Goiás in the Brasília fold belt within Tocantins Province (Pimentel et al 2000, Queiroz et al 2008, Jost et al 2013 (Fig. 2).…”

Section: Regional Geologymentioning

confidence: 99%

Prospectivity analysis of gold and iron oxide copper-gold-(silver) mineralizations from the Faina Greenstone Belt, Brazil, using multiple data sets

et al. 2017

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ABSTRACT:The Faina Greenstone Belt is located in the southern sector of the Goiás Archean Block and has been investigated since the 18 th century because of its gold deposits. Recent studies have revealed the polymetallic potential of the belt, which is indicated by anomalous levels of Ag, Cu, Fe and Co in addition to Mn, Ba, Li, Ni, Cr and Zn. This study was developed based on a detailed analysis of two selected target sites, Cascavel and Tinteiro, and multiple data sets, such as airborne geophysics, geochemistry and geological information. These datasets were used to create a final prospectivity map using the fuzzy logic technique. The gold mineralization of Cascavel target is inserted in an orogenic system and occurs in two overlapping quartz veins systems, called Mestre-Cascavel and Cuca, embedded in quartzite with an average thickness 50 cm and guidance N45º-60ºW/25ºSW with free coarse gold in grains 2-3 mm to 3 cm. The prospectivity map created for this prospect generated four first-order favorable areas for mineralization and new medium-favorability foci. The Tinteiro area, derived from studies conducted by Orinoco do Brasil Mineração Ltda., shows polymetallic mineralization associated with an iron oxide-copper-gold ore deposit (IOCG) system posterior to Cascavel target mineralization. Its prospectivity map generated 19 new target sites with the potential for Au, Cu and Ag mineralization, suggesting new directions for future prospecting programs. KEYWORDS:Faina Greenstone Belt; aeromagnetometry; gamma spectrometry; gold mineralization; polymetallic mineralization; fuzzy logic. RESUMO: O Greenstone Belt INTRODUCTIONGlobally, mining companies seek to utilize prospective efficient methods that decrease costs during mineral exploration stages. To achieve such goals, they must use techniques that efficiently aggregate the data generated in the different stages of a given study by focusing on models that have a greater likelihood of estimating deposits (Robert et al. 2007). Magnetic surveys coupled with high-resolution gamma spectrometry data represent available technology in airborne geophysics for the detection of relevant structures for mineral exploration, and they have been shown to be efficient in the selection of follow-up target sites in tropical terranes (Silva et al. 2012, Carrino et al. 2011.The Faina Greenstone Belt is the target of this study, and, along with the Pilar de Goiás, Guarinos, Crixás and Serra de Santa Rita belts, it is part of the granite-greenstone terranes of the Archean-Paleoproterozoic terrane of Goiás, which is located in the northern sector of the Brasília Belt (Pimentel et al. 2004, Jost et al. 2005, Jost et al. 2013. This region has been investigated since the time of the Bandeirantes explorers (18 th and 19 th centuries) and shows the potential to host gold (Au) mineralizations. Several companies have mined in the area, including the well-known Metais de Goiás S.A. (METAGO), Western Mining Co., Amazônia Mineração and Troy Resources Brazil.The discovery of Sertão, a low-tonnag...

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“…No norte, faz contato com rochas do Arco Magmático de Mara Rosa, as quais cavalgam o Bloco Arqueano-Paleoproterozoico mediante rampa frontal com vergência para sul e denominada de Lineamento Mandinópolis ) e, no sul, por rampa lateral de rochas do Grupo Araxá, ambos do Neoproterozoico. No oeste, está em contato com gnaisses tonalíticos e granodioríticos do Complexo Caiamar e, no leste, com gnaisses tonalíticos, granodioríticos e graníticos do Complexo Moquém, de idades U-Pb SHRIMP em zircão de 2,85 Ga e 2,75 Ga, respectivamente (Queiroz et al, 2008). No limite sudoeste está parcialmente sotoposto, por falha de empurrão de baixo ângulo a horizontal, por klippen da Sequência Morro Escuro (Figura 2), um resto de sequência plataformal composta por metaconglomerados, quartzitos, dolomitos e formação ferrífera do tipo Superior, de idade ainda desconhecida, supostamente do Paleoproterozoico (Jost et al, 1989).…”

Section: Contexto Geológicounclassified

Estratigrafia e geocronologia do greenstone belt de Guarinos, Goiás

Jost

Rodrigues²,

Carvalho³

et al. 2012

Geol. USP, Sér. cient.

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Disponível on-line no endereço www.igc.usp.br/geologiausp -31 -RESUMO O greenstone belt de Guarinos é uma das três faixas de rochas supracrustais de baixo grau metamórfico marginadas por ortognaisses do extremo norte do Bloco Arqueano de Goiás. A investigação da estratigrafia daquelas faixas iniciou no final da década de 1970, com modificações ao longo dos anos em decorrência de mapeamentos geológicos de detalhe. A proposta estratigráfica mais recente em vigor do greenstone belt de Guarinos reúne as rochas supracrustais no Grupo Guarinos, subdividido nas formações Serra do Cotovelo (metakomatiitos), Serra Azul (metabasaltos), São Patricinho (metaturbiditos máficos), Aimbé (BIF) e Cabaçal (filitos carbonosos e metarenitos impuros). O mapeamento de detalhe e os resultados de sondagens do programa de exploração mineral na área pela Yamana Desenvolvimento Mineral S.A. possibilitaram redefinir a Formação Cabaçal e desdobrá-la em um membro inferior de filitos carbonosos com intercalações de derrames de basalto e lentes de gondito; um intermediário de horizonte de gondito e formação ferrífera com metachert e barita maciça; e um superior de filito carbonoso com eventuais lentes de metachert. Os metarenitos impuros, por seu turno, são propostos sob a denominação de Formação Mata Preta, a qual está lateralmente interdigitada com as rochas da Formação Cabaçal. Dados geocronológicos U-Pb obtidos por LA-ICP-MS em cristais detríticos de zircão dos turbiditos máficos da Formação São Patricinho e dos metarenitos da Formação Mata Preta indicam área fonte dominada por rochas do Sideriano e Riaciano, com parcial participação de fonte Arqueana. A natureza dos litotipos das formações Cabaçal e Mata Preta e as relações de contato entre ambas sugerem que o estágio de bacia que representam evoluiu a partir de importante evento anóxico oceâni-co mundial de 2,2 a 2,06 Ga e responsável pela Formação Cabaçal. O ambiente euxênico foi contemporâneo com um arco magmático que atuou como fonte da carga clástica dos arenitos da Formação Mata Preta.Palavras-chave: Greenstone belt de Guarinos; Goiás; Revisão estratigráfica; Geocronologia; Evolução de bacia. ABSTRACTThe Guarinos greenstone belt is one of the three low metamorphic grade supracrustal rocks assemblage rimmed by orthogneisses of Central Brazil's Archean Block northern limits. The investigation of the stratigraphy of those greenstone belts started by the end of 1970's and underwent improvements during the years as a result of detailed geological mapping. The latest and accepted stratigraphic model for the Guarinos greenstone belt refers its supracrustal rocks under the Guarinos Group, which is subdivided into the Serra do Cotovelo (metakomatiites), Serra Azul (metabasalts), São Patricinho (mafic metaturbidites), Aimbé (BIF) and Cabaçal (carbonaceous phyllites and impure metarenites) formations. Detailed geologic mapping (1:10,000) and drill-cores during an exploration program by Yamana Desenvolvimento Mineral S.A. in the area allowed a better definition of the metasedimentary package of...

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U–Pb SHRIMP and Sm–Nd geochronology of granite–gneiss complexes and implications for the evolution of the Central Brazil Archean Terrain

Cited by 31 publications

References 19 publications

The tectonic evolution of the Neoproterozoic Brasília Belt, central Brazil: a geochronological and isotopic approach

The tectonic evolution of the Neoproterozoic Brasília Belt, central Brazil: a geochronological and isotopic approach

Prospectivity analysis of gold and iron oxide copper-gold-(silver) mineralizations from the Faina Greenstone Belt, Brazil, using multiple data sets

Estratigrafia e geocronologia do greenstone belt de Guarinos, Goiás

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