Granites of the intracontinental termination of a magmatic arc: an example from the Ediacaran Araçuaí orogen, southeastern Brazil

Gonçalves, Leonardo; Alkmim, Fernando Flecha de; Pedrosa-Soares, Antônio Carlos; Dussin, Ivo; Valeriano, Cláudio de Morisson; Lana, Cristiano; Tedeschi, Mahyra

doi:10.1016/j.gr.2015.07.015

Cited by 70 publications

(45 citation statements)

References 63 publications

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“…Similarly, on the eastern São Francisco craton, the minimum depositional age is constrained between 590 and 545 Ma from zircon crystallization ages of the syn-collisional G2 granitic supersuite in the Araçuaí fold belt, which structurally affected the eastern margin of the Bambuí basin (e.g. Pedrosa-Soares et al, 2001;Gonçalves et al, 2015). It is evident that different datasets have yielded contradictory age constraints for the Bambuí Group, with very different implications for the evolution of the São Francisco craton and Ediacaran Earth history.…”

Section: Archean-paleoproterozoicmentioning

confidence: 99%

The Carrancas Formation, Bambuí Group: A record of pre-Marinoan sedimentation on the southern São Francisco craton, Brazil

Uhlein

Halverson

et al. 2016

Journal of South American Earth Sciences

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Section: Archean-paleoproterozoicmentioning

confidence: 99%

The Carrancas Formation, Bambuí Group: A record of pre-Marinoan sedimentation on the southern São Francisco craton, Brazil

Uhlein

Halverson

et al. 2016

Journal of South American Earth Sciences

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“…An Excel sheet developed by Chemale et al (2012) was used to data reduction. Further methodology can be found in Gonçalves et al (2016).…”

Section: Methodsmentioning

confidence: 99%

Stratigraphy, tectonics and detrital zircon U-Pb (LA-ICP-MS) geochronology of the Rio Preto Belt and northern Paramirim corridor, NE, Brazil

et al. 2017

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Two important Proterozoic metasedimentary sequences, the Rio Preto and Santo Onofre Groups, crop out along the northwestern margin of the São Francisco craton and in northern Paramirim corridor, respectively. The Rio Preto Group, involved in the eponymous fold-thrust belt along the northwestern cratonic boundary, comprises the Formosa (garnet schist, quartz-mica schist, quartzite, chlorite-sericite schist and ferriferous quartz schist) and Canabravinha (quartzite, micaceous quartzite, metarhytmite, phylite, schist and metaturbidite) formations. The Santo Onofre Group occurs exclusively in the Paramirim corridor, and is composed of quartzite and minor carbonaceous or Mn-rich phylite. These units record sedimentation in shallow to deep-water marine settings related to rift basins, and were deformed and metamorphosed under greenschist facies conditions during the Brasiliano orogeny. Here we present 427 new detrital zircon U-Pb ages, which constrain the maximum depositional ages of ca. 971 Ma for the Santo Onofre Group, ca. 912 Ma for the Canabravinha Formation, and ca. 965 Ma for the Formosa Formation of the Rio Preto Group. Our data suggests that the Santo Onofre and the Rio Preto Groups accumulated in two distinct basin settings. The latter, composed mostly of sandy rocks, would represent a relatively stable, shallow-marine shelf environment. The Rio Preto Group, with metadiamictite, quartzite, pelitic and rhythmitic rocks, represents a shallow to deep marine environment influenced by gravity flows. Both groups were probably deposited in the Late Tonian, and are potential correlatives of the lower (pre-glacial) units of the Macaú-bas Group of the Araçuaí belt. KEYWORDS:Detrital zircon U-Pb geochronology, Brasiliano orogeny, sedimentary provenance, Rio Preto Belt, Paramirim corridor. RESUMO: Duas importantes sequências metassedimentares proterozoicas ocorrem ao longo da margem noroeste do Cráton do

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“…Consumption of the oceanic segment of the basin led to the development of the Rio Doce magmatic arc (Fig. 14.11b), represented by the association of plutonic rocks of the G1 Supersuite with the volcanic units of the Rio Doce Group exposed in the crystalline core of the AWCO , 2011Gonçalves et al 2014Gonçalves et al , 2016Tedeschi et al 2016). The oldest component of the Rio Doce arc so far dated in the orogen yielded a crystallization age of ca.…”

Section: Evolutionary Synthesismentioning

confidence: 99%

“…14.2). Recent syntheses on the lithological assemblages and evolution of the crystalline core of the AWCO are provided by Gradim et al (2014), Gonçalves et al (2014Gonçalves et al ( , 2016, Richter et al (2016), and Tedeschi et al (2016). The southern limit of the Araçuaí belt is arbitrary.…”

Section: Introductionmentioning

confidence: 99%

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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Granites of the intracontinental termination of a magmatic arc: an example from the Ediacaran Araçuaí orogen, southeastern Brazil

Cited by 70 publications

References 63 publications

The Carrancas Formation, Bambuí Group: A record of pre-Marinoan sedimentation on the southern São Francisco craton, Brazil

The Carrancas Formation, Bambuí Group: A record of pre-Marinoan sedimentation on the southern São Francisco craton, Brazil

Stratigraphy, tectonics and detrital zircon U-Pb (LA-ICP-MS) geochronology of the Rio Preto Belt and northern Paramirim corridor, NE, Brazil

The Araçuaí Belt

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