Arc accretion and crustal reworking from late Archean to Neoproterozoic in Northeast Brazil

Ferreira, Alanielson; Dantas, Elton Luiz; Fuck, Reinhardt A.; Nedel, Ingrid M.

doi:10.1038/s41598-020-64688-9

Cited by 30 publications

(20 citation statements)

References 51 publications

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“…The Campo Grande Block (CGB) is located in the Rio Grande do Norte domain (Ferreira, Dantas, Fuck, & Nedel, 2020; Ferreira, Dantas, Santos, et al, 2020), north‐eastern portion of the Borborema Province (Figure 1b). The CGB consists of a migmatite complex with multiple partial melting phases and mafic associations (Ferreira, Dantas, Santos, et al, 2020).…”

Section: Resultsmentioning

confidence: 99%

“…The final configuration of the Borborema Province resulted from the diachronic convergence of the West African, Amazonian and São Francisco‐Congo cratons during the assembly of West Gondwana (Figure 1a,b; Arthaud et al., 2008; Ganade de Araujo et al, 2014; Santos et al, 2018). The Archean crustal fragments can be considered as small Archean cores surrounded by Palaeoproterozoic terrains (Brito Neves, 2011; Brito Neves & Fuck, 2014; Ferreira, Dantas, Fuck, & Nedel, 2020). These terrains comprise the majority of the 2.2–2.0 Ga gneiss‐migmatite basement within the Borborema Province (Dantas et al., 2004, 2013).…”

Section: Regional Geologymentioning

confidence: 99%

“…In this debate, the application of a geodynamic unifying model or the reconciliation of different models for the early granitoids generation at convergent plate margins is still in dispute (Cawood et al., 2018; Chowdhury et al., 2020; Johnson et al., 2017; Laurent et al., 2020). Moreover, it appears that there was a shift from the Archean continental crust produced by lithospheric peeling processes to Proterozoic crust generated by magmatic arcs (Chowdhury et al., 2020; Ferreira, Dantas, Fuck, & Nedel, 2020).…”

Section: Introductionmentioning

confidence: 99%

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The previously missing c. 2.9 Ga high‐K continental crust in West Gondwana revealed in Northeast Brazil

2020

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2.9 Ga is an uncommon magmatic age in Archean evolution worldwide, especially in West Gondwana. We identified so far unknown 2.97–2.92 Ga high‐K calc‐alkaline magmatism in the Borborema Province, northeast Brazil. It appears to indicate that the transition to high‐K magmas occurred before c. 2.7 Ga in Earth's history. The 2.9 Ga protoliths were reworked and progressively changed composition to 2.65 Ga and 2.25 Ga higher‐K granites in early magmatic arcs. Therefore, despite several reworking events from the Archean to Proterozoic times, these rare relicts of K‐rich magmatism indicate that reworking of felsic components was significant for the growth and differentiation of continental crust from c. 2.9 Ga onwards in West Gondwana.

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Section: Resultsmentioning

confidence: 99%

Section: Regional Geologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The previously missing c. 2.9 Ga high‐K continental crust in West Gondwana revealed in Northeast Brazil

2020

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“…Although no quantitative crustal growth curves of the orogenic Borborema Province have been reported, present models range from purely intracontinental reworking 21 , to juvenile arc accretion 22,23 and docking followed by reworking of unrelated terranes 24 , or even to questionable autochthonous accretion surrounding old small Archean crust 25 .…”

Section: Introductionmentioning

confidence: 87%

Decratonization by Rifting followed by Orogeny and Transcurrent Dispersal of Old Terranes in NE Brazil: A Common Feature of Gondwana Amalgamation?

Ganade¹,

Weinberg²,

Caxito³

et al. 2020

Preprint

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Dispersion and deformation of cratonic fragments within orogens in the periphery of cratons require weakening of the craton margins in a process of decratonization. The Borborema orogenic province, in NE Brazil, is one of several Brasiliano/Panafrican late Neoproterozoic orogens that led to the amalgamation of Gondwana. A common feature of these orogens is that a period of extension and opening of narrow oceans preceded inversion and collision. For the case of the Borborema Province, the São Francisco Craton was pulled away from its other half, the Benino-Nigerian Shield, during an extension event lasting between 1 Ga and 0.65 Ma. This was followed by inversion and a transpressional orogeny from c. 0.60 Ga onwards. Here we investigate the boundary region between the north São Francisco Craton and the Borborema Province and demonstrate how cratonic blocks became physically involved in the orogeny. We combine these results with a wide compilation of U-Pb and Nd-isotopic model ages to show that the BP consists of up to 65% of strongly sheared ancient rocks affiliated with the Sao Francisco/Benino-Nigerian Craton, separated by major transcurrent shear zones, with only ~ 15 % addition of juvenile material during the orogeny. This evolution is repeated across a number of Brasiliano/Panafrican orogens, with significant local variations, and indicate that extension weakened entire cratonic regions in a process of decratonization that prepared them for involvement in the orogenies that led to the amalgamation of Gondwana.

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“…The Borborema is a Precambrian Province of the NE Brazil (Almeida et al, 1981;Brito Neves et al, 2000;Santos et al, 2018) formed by the agglutination of large allochthonous crustal blocks during orogenic events (Jardim de Sá et al, 1992;Jardim de Sá, 1994;Santos, 1996;Santos et al, 2000). Its current configuration includes tectonic domains that resulted from the diachronic convergence of the West African, Amazonian and São Francisco-Congo cratons during the Brasiliano Cycle (Caby et al, 1991;Jardim de Sá, 1994;Vauchez et al, 1995;Archanjo et al, 2013;Souza et al, 2016;Ferreira et al, 2020), with the generation of shear zones and a large, chemically diverse, granite plutonism (Nascimento et al, 2008(Nascimento et al, , 2015.…”

Section: Geological Backgroundmentioning

confidence: 99%

O Batólito Catolé do Rocha (RN-PB): Um magmatismo granítico do tipo-A2 reduzido no Domínio Rio Piranhas-Seridó, Província Borborema, Nordeste do Brasil

Oliveira

Vilalva

Alves

et al. 2020

Geol. USP. Sér. Cient.

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O Batólito Catolé do Rocha, situado no Domínio Rio Piranhas-Seridó da Província de Borborema (Nordeste (NE) do Brasil), é um importante representante do magmatismo ediacarano pós-colisional que acometeu essa região. Ele inclui sienogranitos e quartzo sienitos metaluminosos a ligeiramente peraluminosos, rochas básico-intermediárias e, subordinadamente, diques e/ou bolsões de microgranitos menores. Esse batólito é tido como representante da suíte cálcio-alcalina de alto K, que inclui principalmente granitos de afinidade química próxima aos de tipo-I caledonianos. Contudo, são diversas as evidências litoquímicas que aproximam o batólito aos magmas de tipo-A. As rochas graníticas são álcali-cálcicas a alcalinas, possuem caráter ferroano, concentrações significativas de elementos litófilos de raio grande (LILE) e de alto potencial iônico (HFSE) e enriquecimento de terras-raras leves (LREE) sobre pesados (HREE). Suas assinaturas químicas permitem classificá-los como granitos de tipo‑A2 pós-colisionais. Estimativas geotermobarométricas apontam cristalização sob pressões de 4,6 – 6,3 kbar (~16 – 24 km de profundidade) e temperaturas entre 950 – 750°C, em condições de baixa fugacidade de oxigênio (-4 < ΔQFM < -1). Evidências químicase distintas condições redox estimadas para os granitos e rochas básico-intermediárias do batólito sugerem que se trata de magmas distintos, com misturas do tipo mixing e mingling locais. A origem do batólito parece estar relacionada a fontes enriquecidas (metassomatizadas), com diferenciação controlada principalmente por processos de cristalização fracionada.

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Arc accretion and crustal reworking from late Archean to Neoproterozoic in Northeast Brazil

Cited by 30 publications

References 51 publications

The previously missing c. 2.9 Ga high‐K continental crust in West Gondwana revealed in Northeast Brazil

The previously missing c. 2.9 Ga high‐K continental crust in West Gondwana revealed in Northeast Brazil

Decratonization by Rifting followed by Orogeny and Transcurrent Dispersal of Old Terranes in NE Brazil: A Common Feature of Gondwana Amalgamation?

O Batólito Catolé do Rocha (RN-PB): Um magmatismo granítico do tipo-A2 reduzido no Domínio Rio Piranhas-Seridó, Província Borborema, Nordeste do Brasil

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