Toward a new tectonic model for the Late Proterozoic Araçuaí (SE Brazil)-West Congolian (SW Africa) Belt

Pedrosa-Soares, Antônio Carlos; Noce, Carlos Maurício; Vidal, Ph.; Monteiro, Reis; Leonardos, O. H.

doi:10.1016/0895-9811(92)90015-q

Cited by 109 publications

(105 citation statements)

References 24 publications

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“…Detrital zircon grains from a quartzite suggest a maximum depositional age of around 750 Ma (Kuchenbecker et al 2015). The Upper Chapada Acauã Formation passes laterally into Ribeirão da Folha Formation, which contains distal passive-margin and ocean-floor deposits (Pedrosa-Soares et al 1992, 2011, Queiroga et al 2007. Detrital zircon grains suggest a maximum depositional age of around 806 Ma (Peixoto et al 2015).…”

Section: Central Espinhaço -Southern Portionmentioning

confidence: 99%

“…The name "Macaúbas" has been previously used by Moraes (1929) and Moraes and Guimarães (1931) to describe only the diamictite-bearing units. The concept of "groups" has been expanded to integrate non-glacial units (Karfunkel et al 1985, Pedrosa-Soares et al 1992, Noce et al 1997. Recent geochronological dating has provided a new view of Macaúbas' stratigraphy and basin evolution (Babinski et al 2012, Castro 2014, Kuchenbecker et al 2015, Sousa 2016.…”

Section: Central Espinhaço -Southern Portionmentioning

confidence: 99%

“…The post-glacial sequence comprises the diamictite-free units in Upper Chapada Acauã and Ribeirão da Folha Formations (Pedrosa-Soares et al 1992, 2011. The Upper Chapada Acauã comprises sandstone and mudstone, which were deposited in a shelf environment during the passive margin stage (Noce et al 1997, Pedrosa-Soares et al 2011.…”

Section: Central Espinhaço -Southern Portionmentioning

confidence: 99%

“…The Espinhaço mountain range is a remarkable feature that extends with a sub-meridian direction across the entire extent of the Congo-São Francisco paleocontinent. The southern and central Espinhaço range regions integrate the Araçuaí fold and thrust belt as one of the external domains of the Neoproterozoic Araçuaí-West Congo orogen (Almeida 1977, Pedrosa-Soares et al 1992, while the northern extension occurs along the eastern border of the Paramirim aulacogen, which was partially inverted, and involves the basement in the cover deformation (Schobbenhaus 1993, Danderfer 2000, Alkmim et al 1993 Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

“…1). This basin corresponds to a rift that evolved to a passive margin within the Congo-São Francisco paleocontinent as a paleo-gulf, and was under glaciogenic influence during filling (Noce et al 1997, Uhlein et al 2007, Pedrosa-Soares et al 1992, 2011, Babinski et al 2012, Kuchenbecker et al 2015. According to Schobbenhaus (1996) and Danderfer and Dardenne (2002), the last basin-formation event along the northern Espinhaço range is represented by the siliciclastic, unconformity-bounded unit of Santo Onofre Group.…”

Section: Introductionmentioning

confidence: 99%

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Tectonics and sedimentation of the central sector of the Santo Onofre rift, north Minas Gerais, Brazil

Costa

Filho

2017

Braz. J. Geol.

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ABSTRACT:The Santo Onofre Group registers the filling of a Tonian, intracontinental paleo-rift that developed along the northern and central Espinhaço regions. This paper examines this unit in the central Espinhaço region with stratigraphic analysis and U-Pb geochronology, reviewing and dividing into the Canatiba and Rio Peixe Bravo Formations, which include the Barrinha Member. The Canatiba Formation mainly comprises carbon-rich mudstones that were deposited through low-density turbidity flows that alternated with sediment settling under anoxic conditions. The Rio Peixe Bravo Formation consists of a succession of sandstones and minor mudstones, which were deposited through low-to high-density turbidity flows. The Barrinha Member mainly consists of conglomerates and is related to channelized debris flows. Detrital zircon grains show maximum depositional ages of 930 ± 33 Ma and around 865 Ma for the Canatiba and Rio Peixe Bravo Formations, respectively. We interpret the Santo Onofre rifting to be relative younger than that for the Sítio Novo Group and to be a precursor stage of the glacial and post-glacial rift-to-passive margin-related sequences of the Macaúbas Group. The lithostratigraphic term "Macaúbas Supergroup" would be of better use to accommodate the unconformity-bounded Tonian sequences that were related to the Rodinia breakup in the Congo-São Francisco paleocontinent. (Hoffman 1991, Meert 2001. Several phases that involved the breaking of Rodinia occurred, either through passive or active rifting, which were induced by remotely applied tensions (in-plane stress) and mantle plumes, respectively . These processes operated diachronically through a continental mass, and the full disintegration of the continent was complete at the end of the Tonian Period (Hoffman 1991, Cawood et al. 2016. Many rifts were formed before reaching this stage, some of which were aborted, and mafic dyke swarms intruded, which became dispersed in the scattered continents (Chew et al. 2010, Volkert et al. 2015. Investigations of these features have provided a better understanding of the space-temporal evolution of the Rodinia, for reconstructions (Hoffman 1991, Meert 2001. KEYWORDS:The Congo-São Francisco paleocontinent is characterized as one of several fragments of the Rodinia (Hoffman 1991. This paleocontinent encompasses the cover and basement rocks of São Francisco and Congo cratons and their marginal orogenic belts ( Fig. 1; Almeida 1977, Alkmim et al. 1993, Trompette 1994. The Espinhaço mountain range is a remarkable feature that extends with a sub-meridian direction across the entire extent of the Congo-São Francisco paleocontinent. The southern and central Espinhaço range regions integrate the Araçuaí fold and thrust belt as one of the external domains of the Neoproterozoic Araçuaí-West Congo orogen (Almeida 1977, Pedrosa-Soares et al. 1992, while the northern extension occurs along the eastern border of the Paramirim aulacogen, which was partially inverted, and involves the basement in the cover deformation (Schobbenhau...

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Section: Central Espinhaço -Southern Portionmentioning

confidence: 99%

Section: Central Espinhaço -Southern Portionmentioning

confidence: 99%

Section: Central Espinhaço -Southern Portionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Tectonics and sedimentation of the central sector of the Santo Onofre rift, north Minas Gerais, Brazil

Costa

Filho

2017

Braz. J. Geol.

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The São Francisco Craton and Its Margins

Heilbron

Cordani

Alkmim

2016

Regional Geology Reviews

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The Araçuaí Belt

Alkmim

Kuchenbecker

Reis

et al. 2016

São Francisco Craton, Eastern Brazil

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The Araçuaí belts extends along the curved southeastern margin of the São Francisco craton between the Brazilian coast and Lat 21°S, where it merges with the Ribeira belt. It represents the external, basement-involved fold-thrust belt of the Araçuaí-West Congo confined orogen (AWCO), which formed due to the closure of the terminal branch of the Adamastor ocean during the amalgamation of West Gondwana in the Ediacaran and beginning of the Cambrian. Bounded to the east and southeast by the high grade and granitic core of the AWCO, the Araçuaí belt involves a basement assemblage older than 1.8 Ga, the 1.7-0.9 Ga rift to rift-sag successions of the Espinhaço Supergroup, the Tonian-Edicaran rift-passive margin Macaúbas Group, as well as the syn-orogenic Salinas Formation and crustal derived granitic intrusions. The Macaúbas Group, the type unit of the belt, contains a glaciomarine sequence made up of thick diamictites, sandstones and Rapitan-type banded iron formations. The units exposed along the belt were metamorphosed under greenschist to amphibolite facies conditions and affected by thrusts, reverse faults and cratonward verging folds, developed between 575 and 530 Ma. The Araçuaí orogenic front propagates into the craton interior and interacts with preexistent rift structures. This chapter describes the stratigraphic framework and overall structure of the Araçuaí belt, emphasizing the paleogeographic and tectonic significance of its sedimentary and volcanic assemblages.

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Toward a new tectonic model for the Late Proterozoic Araçuaí (SE Brazil)-West Congolian (SW Africa) Belt

Cited by 109 publications

References 24 publications

Tectonics and sedimentation of the central sector of the Santo Onofre rift, north Minas Gerais, Brazil

Tectonics and sedimentation of the central sector of the Santo Onofre rift, north Minas Gerais, Brazil

The São Francisco Craton and Its Margins

The Araçuaí Belt

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