Geology and SHRIMP U-Pb Geochronology of the Igarape Bahia Deposit, Carajas Copper-Gold Belt, Brazil: An Archean (2.57 Ga) Example of Iron-Oxide Cu-Au-(U-REE) Mineralization

Tallarico, Fernando Henrique Bucco; Figueiredo, Bernardino Ribeiro; Groves, David; Kositcin, N; McNaughton, Neal J.; Fletcher, Ian R.; Rego, José Luzimar

doi:10.2113/100.1.0007

Cited by 128 publications

(74 citation statements)

References 52 publications

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“…The CMP is part of the Archean tectonic domain known as the Itacaiúnas Shear Belt, found in the eastern portion of the Amazonian craton, which is composed of high-grade metamorphic complexes, volcanic-sedimentary sequences, and granite-greenstone terrains [14]. The Carajá s Belt is a highly mineralized province, with enormous reserves of iron and manganese, as well as Au-Cu deposits encompassing the Carajá s gold-copper belt [15]. The N1 area has rocks of the Grã o Pará Group, and has been subdivided into two units: volcanic rocks of the Parauapebas Formation [16], and the ironstones of the Carajá s Formation [17].…”

Section: Study Areamentioning

confidence: 99%

Evaluation of Digital Classification of Polarimetric SAR Data for Iron-Mineralized Laterites Mapping in the Amazon Region

et al. 2013

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This study evaluates the potential of C-and L-band polarimetric SAR data for the discrimination of iron-mineralized laterites in the Brazilian Amazon region. The study area is the N1 plateau located on the northern border of the Carajá s Mineral Province, the most important Brazilian mineral province which has numerous mineral deposits, particularly the world's largest iron deposits. The plateau is covered by low-density savanna-type vegetation (campus rupestres) which contrasts visibly with the dense equatorial forest. The laterites are subdivided into three units: chemical crust, iron-ore duricrust, and hematite, of which only the latter two are of economic interest. Full polarimetric data from the airborne R99B sensor of the SIVAM/CENSIPAM (L-band) system and the RADARSAT-2 satellite (C-band) were evaluated. The study focused on an assessment of distinct schemes for digital classification based on decomposition theory and hybrid approach, which incorporates statistical analysis as input data derived from the target decomposition modeling. The results indicated that the polarimetric classifications presented a poor performance, with global Kappa values below 0.20. The accuracy for the identification of units of economic interest varied from 55% to 89%, albeit with high commission error values. In addition, the results using L-band were considered superior OPEN ACCESS Remote Sens. 2013, 5 3102 compared to C-band, which suggest that the roughness scale for laterite discrimination in the area is nearer to L than to C-band.

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Section: Study Areamentioning

confidence: 99%

Evaluation of Digital Classification of Polarimetric SAR Data for Iron-Mineralized Laterites Mapping in the Amazon Region

et al. 2013

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“…In the latter, SHRIMP zircon ages of 3,002 ± 14 Ma and 2,861 ± 12 Ma are considered as representative of the parent magmatic rock and the granulite facies metamorphism, respectively (Pidgeon et al 2000). The basement rocks are overlain by meta-volcanic-sedimentary units of the Rio Novo Group (Hirata et al 1982) and the 2.73-2.76 Ga Itacaiúnas Supergroup (Igarapé Salobo, Igarapé Pojuca, Grão Pará, and Igarapé Bahia groups; Wirth et al 1986;Docegeo 1988;Machado et al 1991;Trendall et al 1998;Krymsky et al 2002;Galarza et al 2003;Pimentel et al 2003;Tallarico et al 2005). These volcanic-sedimentary sequences comprise variably deformed and metamorphosed (low greenshist to amphibolite facies) basic and felsic volcanic and pyroclastic rocks, iron formations, and clastic sedimentary rocks (Wirth et al 1986;Hirata et al 1982;Docegeo 1988;Machado et al 1991).…”

Section: Regional Geology Of the Carajas Mineral Provincementioning

confidence: 99%

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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“…Approximately 140 t of gold have been produced from the supergene-enriched zone, which is now practically exhausted. Both syngenetic (Ferreira Filho, 1985;Althoff et al, 1994;Almada and Villas, 1999;Dreher andXavier, 2001, 2005) and epigenetic (Huhn and Nascimento, 1997;Tallarico et al, 1998Tallarico et al, , 2000Tallarico et al, , 2005Oliveira et al, 1998;Lindenmayer et al, 1998;Tazava, 1999) models have been proposed for the Igarapé Bahia mineralization. In addition, some epigeneticists postulate a genetic link of the mineralization with Paleoproterozoic granitic magmatism (Lindenmayer et al, 1998;Tallarico et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Dating and isotopic characteristics (Pb and S) of the Fe oxide–Cu–Au–U–REE Igarapé Bahia ore deposit, Carajás mineral province, Pará state, Brazil

Galarza

Macambira

Villas

2008

Journal of South American Earth Sciences

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Geology and SHRIMP U-Pb Geochronology of the Igarape Bahia Deposit, Carajas Copper-Gold Belt, Brazil: An Archean (2.57 Ga) Example of Iron-Oxide Cu-Au-(U-REE) Mineralization

Cited by 128 publications

References 52 publications

Evaluation of Digital Classification of Polarimetric SAR Data for Iron-Mineralized Laterites Mapping in the Amazon Region

Evaluation of Digital Classification of Polarimetric SAR Data for Iron-Mineralized Laterites Mapping in the Amazon Region

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

Dating and isotopic characteristics (Pb and S) of the Fe oxide–Cu–Au–U–REE Igarapé Bahia ore deposit, Carajás mineral province, Pará state, Brazil

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