Geology and mineral resources of the Barao de Cocais area, Minas Gerais, Brazil

Simmons, George Clarke

doi:10.3133/pp341h

Cited by 7 publications

(9 citation statements)

References 8 publications

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“…The Tamanduá and Cambotas ridges (Fig. 2) are the locus typicus of the metasedimentary Tamanduá Group described by Simmons and Maxwell (1961), considered as the fundamental unit in the northern QF to understand the temporal distribution of QF and Southern Espinhaço units, as pioneering observed by Harder and Chamberlin (1915) and Guimarães (1931), and later reinforced by Simmons and Maxwell (1961), Hirson (1967), Simmons (1968), Moore (1969), and Dorr II (1969). The temporal and stratigraphic positioning of the Tamanduá Group is speculative due to the absence of non-tectonic contacts between the metasedimentary sequences in the Gandarela, Tamanduá, and Cambotas ridges.…”

Section: Introductionmentioning

confidence: 85%

“…The Fundão-Cambotas fault system presents the cartographic trace similar to that of the syncline and projects the Nova Lima Group on top of the Minas Supergroup (Fundão fault) and this unit on the Tamanduá Group (Simmons 1968, Moore 1969). This fault system and an erosive and angular surface separate the Itabira Group from the Nova Lima Group and the overlying Cercadinho Formation (Piracicaba Group).…”

Section: Lithostratigraphy Of Tamanduá and Cambotas Ridgesmentioning

confidence: 98%

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Detrital zircon records of the Paleo-Mesoproterozoic rift-sag Tamanduá Group in its type-section, Northern Quadrilátero Ferrífero, Minas Gerais, Brazil

et al. 2020

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The Quadrilátero Ferrífero metallogenetic province is located in the southernmost portion of the São Francisco craton, SE Brazil. The Tamanduá and Cambotas ridges stand out topographically in the northeastern portion of Quadrilátero Ferrífero and show NE-SW and N-S directions, respectively. Those ridges involve metasedimentary rocks of the Tamanduá Group bounded by a fault system. Due to stratigraphic and structural complexities, there is little consensus about the maximum sedimentation age and the stratigraphic position in which Tamanduá Group sediments were deposited. In this work, we took advantage of the excellent exposures in the Tamanduá and Cambotas ridges to present detailed stratigraphic observations combined with U-Pb zircon geochronological data from samples of different stratigraphic levels of Tamanduá Group. Furthermore, we provide U-Pb data from samples of the intrusive Pedra Formosa Suite that cut the whole Tamanduá sequence in the study area. Our observations showed that the Tamanduá Group represents a rift-sag basin-fill succession developed along the eastern border of the São Francisco paleoplate. The basal metaconglomerate and metasandstone package grades upward into marine metasandstone and phyllite. Detrital zircon obtained from the basal unit, Antônio dos Santos Formation, reveals maximum depositional ages between ca. 1981 and 1770 Ma. The upper succession, Cambotas Formation, shows a maximum depositional age from 1769 to 1740 Ma. The Pedra Formosa Suite shows zircons that crystallized at ca. 1740 Ma. The stratigraphic framework and the Orosirian-Statherian ages suggest a correlation with the first rifting event within the São Francisco paleoplate, the precursor of Paleo-to Mesoproterozoic Espinhaço basin.

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Section: Introductionmentioning

confidence: 85%

Section: Lithostratigraphy Of Tamanduá and Cambotas Ridgesmentioning

confidence: 98%

Detrital zircon records of the Paleo-Mesoproterozoic rift-sag Tamanduá Group in its type-section, Northern Quadrilátero Ferrífero, Minas Gerais, Brazil

et al. 2020

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“…The Tamanduá Group encompasses polymictic metaconglomerate and metasandstone that grades laterally and upward into metasandstone interbedded with metarkose and, as upper rocks, phyllite and sericite metasandstone (Simmons 1968, Moore 1969, Crocco-Rodrigues 1991, Gomes 2017. A complete study in Cambotas ridge is summarized by Dias (2019) and indicates a Paleo-to Mesoproterozoic DA for Tamanduá Group (Fig.…”

Section: Regional Backgroundmentioning

confidence: 99%

Sedimentary and U-Pb detrital zircons provenance of the Paleoproterozoic Piracicaba and Sabará groups, Quadrilátero Ferrífero, Southern São Francisco craton, Brazil

2019

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The Quadrilátero Ferrífero is an important mineral province located in Southern São Francisco craton, SE Brazil. Its prominent feature is the Gandarela syncline that was formed as part of the regional deformation event in the southernmost part of the craton at ca. 2,000 Ma. The syncline exposes several economically important units of Rio das Velhas and Minas supergroups, widely known for their gold and iron ore mineral deposits. This work focused on the upper Minas Supergroup-Cercadinho Formation and Sabará Group in the Gandarela syncline. We showed detail stratigraphic surveys combined with U-Pb detrital zircon analysis. Data reveal the development of high-to low-density turbidity systems. The first one is related to the deposition of Cercadinho Formation that marks the siliciclastic infilling of the Minas basin. For the Sabará Group, a fine turbidite system of foredeep depocenter is inferred. The detrital zircon analysis indicates that their sediments were derived from Archean, Rhyacian, and Orosirian exhumed terrains, besides granitoids positioned to the south and east of Quadrilátero Ferrífero. We proposed the age of 2,036 ± 25 Ma as the maximum age of deposition of Sabará Group, whose sedimentation occurs in the first stages of Minas accretionary orogeny.

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“…O arcabouço geológico da Região Metropolitana de Belo Horizonte constitui-se predominantemente por granitos e gnaisses dos complexos Belo Horizonte e Caeté, sucedidos por uma seqüência greenstone belt meso/neoarqueana (Supergrupo Rio das Velhas), composta por rochas metassedimentares e vulcânicas. Recobrindo partes do embasamento gnáissico e do cinturão metamórfico encontram-se as unidades proterozóicas (Supergrupos Minas e Espinhaço; e Grupo Bambuí), caracterizadas por rochas sedimentares e metassedimentares, como quartzitos, filitos, itabiritos, siltitos e calcários, além de coberturas fanerozóicas (Simmons & Maxwell 1961, Simmons 1968, Dorr 1969, Dossin et al 1990, Renger et al 1994, Baltazar & Zuchetti 2007, Viana et al 1998e Tuller et al 2010 (Figura 2).…”

Section: Caracterização Do Meio Físicounclassified

Caracterização Das Unidades Geotécnicas Da Porção Leste Da Região Metropolitana De Belo Horizonte – Mg

Reis¹

2019

geonomos

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Este trabalho apresenta a caracterização das unidades geotécnicas da porção oriental da Região Metropolitana de Belo Horizonte. Essa região caracteriza-se por ser um vetor de malha urbana densa e intenso desenvolvimento, além da ocorrência de inúmeras atividades mineradoras. A geologia da área é constituída por rochas granito-gnáissicas dos Complexos Metamórficos Belo Horizonte e Caeté, seccionadas por sistemas de fraturas NW/SE e SW/NE, e rochas metassedimentares e vulcânicas dos Supergrupos Rio das Velhas, São Francisco e Espinhaço, com foliações e acamadamento com mergulhos, predominantemente, para E. A caracterização das litologias descritas teve como principal base bibliográfica o relatório do PDDI/RMBH (Plano Diretor de Desenvolvimento Integrado da Região Metropolitana de Belo Horizonte), que agrupa 10 unidades geotécnicas para toda a Região Metropolitana de Belo Horizonte. Neste trabalho a classificação geotécnica dessas unidades foi realizada a partir da descrição de 114 maciços rochosos localizados em encostas naturais e taludes de corte. Além disso, também foi avaliada a suscetibilidade para ocorrências de processos geodinâmicos. Os resultados contribuíram para a criação de um arcabouço de informações disponíveis sobre as características de unidades geotécnicas da área da RMBH. Palavras Chave: processos geodinâmicos, comportamento geotécnico

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Geology and mineral resources of the Barao de Cocais area, Minas Gerais, Brazil

Cited by 7 publications

References 8 publications

Detrital zircon records of the Paleo-Mesoproterozoic rift-sag Tamanduá Group in its type-section, Northern Quadrilátero Ferrífero, Minas Gerais, Brazil

Detrital zircon records of the Paleo-Mesoproterozoic rift-sag Tamanduá Group in its type-section, Northern Quadrilátero Ferrífero, Minas Gerais, Brazil

Sedimentary and U-Pb detrital zircons provenance of the Paleoproterozoic Piracicaba and Sabará groups, Quadrilátero Ferrífero, Southern São Francisco craton, Brazil

Caracterização Das Unidades Geotécnicas Da Porção Leste Da Região Metropolitana De Belo Horizonte – Mg

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