Nature and Evolution of the Archean Crust of the São Francisco Craton

Teixeira, Wilson; Oliveira, Elson P.; Marques, Leila Soares

doi:10.1007/978-3-319-01715-0_3

Cited by 47 publications

(42 citation statements)

References 70 publications

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“…The Archaean nuclei are made up of a mosaic of individual elongated blocks bounded by Paleoproterozoic orogenic domains (Alkmim & Martins-Neto 2012, Teixeira et al 2017 in the Northeastern portion of the craton. The Southern segment is subdivided into several gneiss-granitic domes (Bonfim, Belo Horizonte, Bação and Santa Bárbara complexes) bounded by Archean-Paleoproterozoic metavolcanossedimentary rocks that host the Quadrilátero Ferrífero Figure 1.…”

Section: Regional Backgroundmentioning

confidence: 99%

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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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Section: Regional Backgroundmentioning

confidence: 99%

“…This map was generated from the Geological Survey of Brazil (Companhia de Pesquisa de Recursos Minerais, CPRM) regional mapping shapefiles (CPRM 2018). mining district (Dorr II 1969, Teixeira et al 2017, as seen in Figure 2.…”

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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“…In the northern half of the craton, a mosaic of Archean blocks comprised of the 3.4–3.2 Ga Gavião block, the 3.0–2.7 Ga Jequié block, and the 3.0–2.1 Ga Serrinha block was assembled with Paleoproterozoic, juvenile crustal segments during the 2.17–2.04 Ga Itabuna–Salvador–Curaçá orogeny (Barbosa & Barbosa, , Barbosa & Sabaté, , ; Teixeira, Oliveira, & Marques, ; Figure ). The southern part of the craton is separated from the northern part by the Paramirim Aulacogen filled with the Proterozoic rift sequences.…”

Section: The Eastern Margin Of the São Francisco Cratonmentioning

confidence: 99%

Post‐Great Oxidation Event Orosirian–Statherian iron formations on the São Francisco craton: Geotectonic implications

Rosière

Bekker

Rolim³

et al. 2019

Island Arc

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The protocratonic core of the São Francisco craton assembled during the 2.1–2.0 Ga Transamazonian orogeny. Orosirian Fe‐rich sequences that extend from the northwestern border of the São Francisco protocraton (Colomi Group) to the southeast under the Espinhaço Belt (the < 1.99 Ga Serra da Serpentina Group) record the opening of an intracratonic basin with the episodically developed ferruginous waters prior to the initiation of the Espinhaço rift at 1.8 Ga. Ferruginous conditions developed again during deposition of the Canjica Iron Formation of the < 1.7 Ga Serra de São José Group in the Espinhaço rift (contemporaneously with felsic magmatism; Conceição do Mato Dentro Rhyolite and Borrachudos Granitic Suite) and extensive sandstones of the < (1666 ±32) Ma Itapanhoacanga and < (1683 ±11) Ma São João da Chapada Formations. In the upper São João da Chapada Formation, banded hematitic phyllite also records input of Fe‐rich fluids. The young age of these iron formations with respect to the conventionally accepted 1.88 Ga age for the youngest shallow‐marine Paleoproterozoic iron formations, the apparent absence of granular facies (granular iron formations), and yet shallow‐water (above fair‐weather base) depositional environment indicate that an unusual setting developed in a large basin after the Great Oxidation Event, in the aftermath of the Transamazonian orogeny. We propose that mantle plumes led to the opening of a previously unrecognized rift system, that could have caused the magmatism, supplied hydrothermal Fe and led to the opening of the Espinhaço, Pirapora, and Paramirim rifts, later obliterated by the Araçuaí orogenic belt during the Neoproterozoic to Early Paleozoic Brasiliano orogeny. The rift system did not develop into an open continental margin but probably evolved into a broad sag basin, stretching across the São Francisco and Congo cratons.

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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%

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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Nature and Evolution of the Archean Crust of the São Francisco Craton

Cited by 47 publications

References 70 publications

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

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

Post‐Great Oxidation Event Orosirian–Statherian iron formations on the São Francisco craton: Geotectonic implications

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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