Late Archean Cu-Au-Mo mineralization at Gameleira and Serra Verde, Caraj�s Mineral Province, Brazil: constraints from Re-Os molybdenite ages

Marschik, Robert; Mathur, Ryan; Ruíz, Joaquin; Leveille, Richard A.; Almeida, António

doi:10.1007/s00126-004-0450-z

Cited by 29 publications

(26 citation statements)

References 24 publications

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“…The ore, hosted by the late Archean volcanic rocks of the Itacaiúnas Supergroup in the Carajás mineral province, consists mainly of biotite and sulfide-rich veins and quartz-grunerite-biotite-gold veins. Molybdenite from Gameleira yields an age of 2614± 14 Ma, which is considered as a more plausible mineralisation age (Marschik et al 2005) than the Proterozoic Sm-Nd and Ar-Ar alteration ages (Pimentel et al 2003). The range of δ 34 S CDT values of sulfides (+2.0‰ to +4.81‰) is consistent with a magmatic sulfur source (Lindenmayer et al 2001;Marschik et al 2002).…”

Section: Gameleiramentioning

confidence: 92%

Origin of fluids in iron oxide–copper–gold deposits: constraints from δ 37Cl, 87Sr/86Sri and Cl/Br

et al. 2006

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The origin of the hypersaline fluids (magmatic or basinal brine?), associated with iron oxide (Cu–U–Au– REE) deposits, is controversial. We report the first chlorine and strontium isotope data combined with Cl/Br ratios of fluid inclusions from selected iron oxide–copper– gold (IOCG) deposits (Candelaria, Raúl–Condestable, Sossego), a deposit considered to represent a magmatic end member of the IOCG class of deposit (Gameleira), and a magnetite–apatite deposit (El Romeral) from South America. Our data indicate mixing of a high δ37Cl magmatic fluid with near 0‰ δ37Cl basinal brines in the Candelaria, Raúl–Condestable, and Sossego IOCG de- posits and leaching of a few weight percent of evaporites by magmatic-hydrothermal (?) fluids at Gameleira and El Romeral. The Sr isotopic composition of the inclusion fluids of Candelaria, Raúl–Condestable, and El Romeral confirms the presence of a non-magmatic fluid component in these deposits. The heavy chlorine isotope signatures of fluids from the IOCG deposits (Candelaria, Raúl– Condestable, Sossego), reflecting the magmatic-hydro- thermal component of these fluids, contrast with the near 0‰ δ37Cl values of porphyry copper fluids known fromthe literature. The heavy chlorine isotope compositions of fluids of the investigated IOCG deposits may indicate a prevailing mantle Cl component in contrast to porphyry copper fluids, an argument also supported by Os isotopes, or could result from differential Cl isotope fractionation processes (e.g. phase separation) in fluids of IOCG and porphyry Cu deposits

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Section: Gameleiramentioning

confidence: 92%

Origin of fluids in iron oxide–copper–gold deposits: constraints from δ 37Cl, 87Sr/86Sri and Cl/Br

et al. 2006

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“…These authors have considered the ore deposition as related to a sub-sea floor event. However, Marschik et al (2005) obtained a Re-Os age of 2,609 ± 13 Ma for molybdenite from Serra Verde, which points to a genetic relationship with 2.56-2.76 Ga alkaline granitoids or 2.6-2.7 Ga volcanic-arc type magmatism.…”

Section: Serra Verde Cu-mo-au Depositmentioning

confidence: 90%

“…It is hosted by the Rio Novo meta-volcanic-sedimentary unit that includes schist, gabbro and meta-mafic volcanic rocks near the contact with the Estrela granite (Marschik et al 2001(Marschik et al , 2005. The host rocks were affected by propylitic alteration and tourmalinization (Villas and Santos 2001).…”

Section: Serra Verde Cu-mo-au Depositmentioning

confidence: 97%

“…1), represents a key area in this province due to its diversity of ore deposit types. It comprises several of the world-class deposits found in the CMP, including: (i) the Serra Pelada Au-Pd-Pt deposit hosted by the *2.68 Ga Rio Fresco Group/Á guas Claras Formation (Cabral et al 2002a, b); (ii) Cu-Mo-Au deposits (e.g., Serra Verde; Villas and Santos 2001) in meta-volcanic rocks of the Rio Novo Group close to the contact with the 2.76 Ga Estrela Granite (Marschik et al 2005); (iii) iron deposits in rocks of the 2.76 Ga Itacaiúnas Supergroup (e.g., Serra Leste); and (iv) manganese deposits (e.g., Sereno; Coelho and Rodrigues 1986) hosted by the Rio Fresco Group.…”

Section: Introductionmentioning

confidence: 99%

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Spatial Analysis of Airborne Geophysical Data Applied to Geological Mapping and Mineral Prospecting in the Serra Leste Region, Carajás Mineral Province, Brazil

et al. 2007

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The Serra Leste region, located in the northeast portion of Carajás Mineral Province (PA), hosts important chrome-PGE, Au-Pd-Pt, Cu-Mo-Au, iron, and manganese deposits and occurrences related to different geological settings. We present a regional prospective model with focus on PGE mineralizations based on airborne geophysics (magnetometry, gamma-ray spectrometry and time domain electromagnetometry) and geological data. Geological and geophysics data analysis indicate a plausible correspondence between areas with meta-mafic-ultramafic rocks and low values in gamma spectrometry, mainly for the thorium channel. The meta-ultramafic units of the complexes, the main host rock of the PGE mineralization, are well defined by analytic signal from the anomalous magnetic field and by the apparent conductance anomalies derived from the GEOTEM system. The combination of the derivative products with updated geological data of the Serra Leste region and PGE-Luanga deposit enable to establish a regional prospective model for PGE and the identification of new targets within the studied area.

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“…Os principais depósitos minerais compreendem: (a) Serra Pelada, caracterizado pela ocorrência de Au-Pd-Pt de origem hidrotermal, condicionada por dobras e falhas, sendo as rochas metassedimentares da FormaçãoÁguas Claras as hospedeiras (Tallarico et al, 2000); (b) Luanga (EGP-Cr-Ni), depósito hospedado em rochas máficas e ultramáficas do complexo homônimo (Suita, 1988;Dardenne & Schobbenhaus, 2001;Ferreira Filho et al, 2007); (c) Serra Verde (Au-Mo-Cu), cuja origem está relacionadaà intrusão de rochas máficas do Grupo Rio Novo e posterior reativação tectônica associada a processos de granitogênese (Villas & Santos, 2001;Marschik et al, 2005); (d) Serra Leste, um alvo ferrífero supergênico localizado em platô e representado pelas típicas coberturas de canga que compreendem o minério laterítico, desenvolvido sobre rochas vulcânicas e formações ferríferas. A composição mineralógica dos depósitos de ferro de Carajás comumente apresenta hematita, magnetita e bandas de jaspe (Lindenmayer et al, 2001).…”

Section: O Bloco Serra Lesteunclassified

Processamento e integração de imagens multiespectrais, de radar e aerogeofísicas do bloco serra leste (Carajás, PA) e discussão do potencial para mineralização de ferro

Carrino¹,

Filho²,

Leite³

2008

Rev. Bras. Geof.

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ABSTRACT. This paper applied multispectral (ETM+/Landsat 7), SAR and airborne geophysical data both to aid the geologic characterization and to highlight tracts with potential for iron deposits in the Serra Leste Block, located in the Serra dos Carajás (Pará State, Brazil). The Minimum Noise Fraction (MNF) technique was applied to six bands of the ETM+/Landsat sensor/satellite, producing the enhancement of iron-bearing surfaces. SAR data allowed the observation of the macro-topography and lineaments that were also interpreted on the basis of airborne geophysical and multispectral data. Geophysical and SAR (RADARSAT-1) data were combined by means of the IHS (intensity-hue-saturation) transform and the products yielded were used to improve the limits of the geologic units and to define targets for iron exploration.The Spectral Angle Mapper (SAM) supervised classification method was applied to a set of selected airborne geophysical images based on the rationale of the iron mineralization descriptive model and geophysical signatures observed at Serra Leste. Using documented iron occurrence as training point for the SAM classification, iron favorability maps were produced and compared against several early maps, proving to be equivalent or superior in accuracy.Keywords: remote sensing, airborne geophysical data, Serra Leste, Carajás, iron mineralizations. RESUMO.Este trabalho utilizou dados multiespectrais (ETM+/Landsat 7), de radar de abertura sintética (RADARSAT-1 e MAPSAR simulado) e aerogeofísicos para caracterização geológica e geração de alvos exploratórios para mineralizações de ferro no bloco Serra Leste, porção oriental da Serra de Carajás (PA). A técnica Minimun Noise Fraction (MNF) foi aplicadaàs seis bandas do sensor ETM+/Landsat 7, produzindo-se o realce de coberturas ricas em ferro. Dados SAR permitiram a observação da macrotopografia e lineamentos que foram também interpretados com base em dados aerogeofísicos e multiespectrais. As imagens geofísicas e SAR do RADARSAT-1 foram integradas por meio da técnica IHS (intensidade-matiz-saturação), e os produtos gerados foram usados para uma melhor delimitação de unidades geológicas e para definição de alvos para prospecção de ferro. O método de classificação supervisionada Spectral Angle Mapper (SAM) foi aplicado a um conjunto de imagens geofísicas selecionadas a partir da determinação do modelo descritivo das mineralizações de ferro e das assinaturas geofísicas verificadas no alvo Serra Leste. Utilizando-se a ocorrência documentada de ferro na região como ponto de treinamento, um mapa de favorabilidade foi produzido. Os resultados da classificação SAM mostraram-se equivalentes ou superiores quanto a sua acurácia quando comparados ao mapa geológico e produtos de realce espectral produzidos neste artigo.Palavras-chave: sensoriamento remoto, aerogeofísica, Serra Leste, Carajás, mineralizações de ferro.

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Late Archean Cu-Au-Mo mineralization at Gameleira and Serra Verde, Caraj�s Mineral Province, Brazil: constraints from Re-Os molybdenite ages

Cited by 29 publications

References 24 publications

Origin of fluids in iron oxide–copper–gold deposits: constraints from δ 37Cl, 87Sr/86Sri and Cl/Br

Origin of fluids in iron oxide–copper–gold deposits: constraints from δ 37Cl, 87Sr/86Sri and Cl/Br

Spatial Analysis of Airborne Geophysical Data Applied to Geological Mapping and Mineral Prospecting in the Serra Leste Region, Carajás Mineral Province, Brazil

Processamento e integração de imagens multiespectrais, de radar e aerogeofísicas do bloco serra leste (Carajás, PA) e discussão do potencial para mineralização de ferro

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