The Paleoproterozoic Mineiro Belt and the Quadrilátero Ferrífero

Alkmim, Fernando Flecha de; Teixeira, Wilson

doi:10.1007/978-3-319-01715-0_5

Cited by 64 publications

(66 citation statements)

References 59 publications

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“…The proposed Proterozoic tectonic evolution for the region suggests three main deformational phases (Alkmim and Marshak, 1998). The first episode generated fold and thrust belts with an NE-SW trend, verging to NW, during the Rhyacian Event (2.1 -2.0 Ga).…”

Section: Regional Geological Contextmentioning

confidence: 99%

“…It comprises an Archean granite-gneiss basement, the Archean Rio das Velhas Supergroup greenstone belt sequence, and the Paleoproterozoic metasedimentary Minas Supergroup (Dorr, 1969) (Figure 2). The region is characterized by a complex structural arrangement, with Archean basement domes surrounded by large synclines where the Minas Supergroup rocks dominate (Dorr, 1969;Chemale et al, 1994;Alkmim and Marshak, 1998).…”

Section: Regional Geological Contextmentioning

confidence: 99%

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In situ LA-ICPMS U-Pb dating of detrital zircons from the Cercadinho Formation, Minas Supergroup

Mendes

Lobato

Suckau

et al. 2014

Geol. USP, Sér. cient.

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In this paper, new geochronological data obtained for the detrital rocks of the Cercadinho Formation, basal unit of the Piracicaba Group, Minas Supergroup, are presented. U-Pb Laser Ablation Induced Coupled Mass Spectrometer (LA-ICPMS) analysis in detrital zircon from quartzite samples provided a new maximum depositional age for the Cercadinho Formation. The youngest zircon population, among the dated samples, provided an average age of 2680 ± 24 Ma. These rocks have an expressive contribution of Meso-to Neoarchean zircons, with ages between 2812 ± 19 and 2909 ± 19 Ma, and older populations between 3212 ± 18 and 3272 ± 16 Ma, which occur mainly in the core of younger zircon grains. Comparing the U-Pb ages obtained in this work with previously published geochronological data for the basal units of the Minas Supergroup (Moeda Formation) an aging of the source for the detrital rocks of Cercadinho Formation can be observed, with a major contribution of zircons from TTG rocks crystallized between the Meso-and Neoarchean.

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Section: Regional Geological Contextmentioning

confidence: 99%

Section: Regional Geological Contextmentioning

confidence: 99%

In situ LA-ICPMS U-Pb dating of detrital zircons from the Cercadinho Formation, Minas Supergroup

Mendes

Lobato

Suckau

et al. 2014

Geol. USP, Sér. cient.

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“…In the cratonic domain, the basement rocks crop out in the Archean core of the southern portion of the São Francisco craton, the Gavião, Serrinha and Jequié blocks, the Mineiro and ItabunaSalvador Curaça belts and the Western Bahia magmatic arc (Figs. 1B and 1C) (Cruz Pereira et al 2016, Barbosa & Barbosa 2017, Alkmim & Teixeira 2017). In the northern São Francisco craton, the Gavião, Jequié and Serrinha blocks show distinct Archean evolutionary histories, as the amalgamation of these microcontinents occurred during the course of the Paleoproterozoic (Barbosa & Sabaté 2004.…”

Section: Geological Settingmentioning

confidence: 99%

Petrography, geochemistry and geochronology of the potassic granitoids of the Rio Itacambiruçu Supersuite: implications for the Meso- to Neoarchean evolution of the Itacambira-Monte Azul block

Bersan

Filho

Abreu³

et al. 2018

Braz. J. Geol.

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“…The evolution of the São Francisco Craton is marked by Paleoproterozoic orogeny, responsible for the amalgam and deformation of different Archaean blocks (Barbosa & Sabaté 2002, 2004Alkmim & Teixeira 2017;Teixeira et al 2017). The relatively stable geotectonic unit, comprising Paleoproterozoic and Archaean terrains, was partially reworked during the Brasiliano Orogeny in the Neoproterozoic.…”

Section: Geological and Structural Settingmentioning

confidence: 99%

“…This portion of the craton is characterized by the presence of Archaean terrains consisting of partially migmatized orthogneiss and sequences of volcano-sedimentary rocks developed between 3,200 and 2,700 Ma. Apparently, between 2,160 and 2,000 Ma, the edges of this set of rocks were partially reworked and incorporated in the Mineiro Belt, developed into an arch-shaped belt around the Archaean core (Alkmim & Marshak 1998) (Fig. 3).…”

Section: Geological and Structural Settingmentioning

confidence: 99%

Evidence of young, proximal and primary (YPP) diamond source occurring in alluviums in the Santo Antônio do Bonito, Santo Inácio and Douradinho rivers in Coromandel region, Minas Gerais

Pereira¹,

Fuck

França³

et al. 2017

Braz. J. Geol.

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Magmatism associated with the Alto Paranaíba structural high comprises kimberlites, kamafugites, and alkaline complexes, forming an approximately 400 x 150 km NW-SE belt in the southern São Francisco Craton. Dating of some intrusions reveals ages between 120 and 75 Ma. Chemical analyses of garnet recovered in alluvium from traditional diamond digging areas indicate peridotitic garnet windows in Três Ranchos and Coromandel. Six hundred and eighty (680) diamonds acquired or recovered during mineral exploration in the digging areas of Romaria, Estrela do Sul, Três Ranchos and Coromandel show unique characteristics, certain populations indicating young, proximal and primary sources (YPP). Analyses of 201 stones from Santo Antônio do Bonito, Santo Inácio and Douradinho rivers alluvium, Coromandel, present no evidence of transport, characterizing a proximal source. Within these river basins, exposures of the Late Cretaceous Capacete Formation basal conglomerate contain mainly small rounded and/or angular quartzite pebbles and of basic and ultrabasic rocks, as well as kimberlite minerals (garnet, ilmenite, spinel, sometimes diamond). A magnetotelluric profile between the Paraná and Sanfranciscana basins shows that the thick underlying lithosphere in the Coromandel region coincides with the peridotitic garnet window and with a diamond population displaying proximal source characteristics. Diamond-bearing kimberlite intrusions occur in different areas of Alto Paranaíba. KEYWORDS

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The Paleoproterozoic Mineiro Belt and the Quadrilátero Ferrífero

Cited by 64 publications

References 59 publications

In situ LA-ICPMS U-Pb dating of detrital zircons from the Cercadinho Formation, Minas Supergroup

In situ LA-ICPMS U-Pb dating of detrital zircons from the Cercadinho Formation, Minas Supergroup

Petrography, geochemistry and geochronology of the potassic granitoids of the Rio Itacambiruçu Supersuite: implications for the Meso- to Neoarchean evolution of the Itacambira-Monte Azul block

Evidence of young, proximal and primary (YPP) diamond source occurring in alluviums in the Santo Antônio do Bonito, Santo Inácio and Douradinho rivers in Coromandel region, Minas Gerais

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