Birthplace of the São Francisco Craton, Brazil: Evidence from 3.60 to 3.64 Ga Gneisses of the Mairi Gneiss Complex

Oliveira, Elson P.; McNaughton, Neal J.; Zincone, Stefano A.; Talavera, Cristina

doi:10.1111/ter.12460

Cited by 43 publications

(10 citation statements)

References 36 publications

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“…It is also possible to recognize signatures of specific sections of the SFC in the old blocks now within the BP. For example, the geological features of the Gavião Block in the SFC and of the Kaduna Massif in the Benino-Nigerian Shield 62 can be found in blocks within the Central and Northern Borborema Province 38 , 40 , 60 . These features include rare occurrences of Paleoarchean rocks (> 3.4 Ga) embedded in Neoarchean (2.8–2.6 Ga) to Paleoproterozoic (2.1–2.0 Ga) rocks imprinted by ca.…”

Section: Discussion: Decratonization Terrane Dispersion and Reworkinmentioning

confidence: 99%

“…These features include rare occurrences of Paleoarchean rocks (> 3.4 Ga) embedded in Neoarchean (2.8–2.6 Ga) to Paleoproterozoic (2.1–2.0 Ga) rocks imprinted by ca. 2.0 Ga high-grade metamorphism 60 , 61 . We conclude that the stepwise increase in deformation intensity of craton margin blocks, illustrated by the Entremontes block and the sigmoidal-shaped Alto Moxotó terrane, illustrates how a number of other Archean-Paleoproterozoic blocks may have been pulled away from the original craton to form inliers within the orogeny.…”

Section: Discussion: Decratonization Terrane Dispersion and Reworkinmentioning

confidence: 99%

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Decratonization by rifting enables orogenic reworking and transcurrent dispersal of old terranes in NE Brazil

Ganade

Weinberg

Caxito

et al. 2021

Sci Rep

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Dispersion and deformation of cratonic fragments within orogens require weakening of the craton margins in a process of decratonization. The orogenic Borborema Province, in NE Brazil, is one of several Brasiliano/Pan-African 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 intermittent extension event between 1.0–0.92 and 0.9–0.82 Ga. This was followed by inversion of an embryonic and confined oceanic basin at ca. 0.60 Ga and transpressional orogeny from ca. 0.59 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 Borborema Province consists of up to 65% of strongly sheared ancient rocks affiliated with the São Francisco/Benino-Nigerian Craton, separated by major transcurrent shear zones, with only ≈ 15% addition of juvenile material during the Neoproterozoic orogeny. This evolution is repeated across a number of Brasiliano/Pan-African orogens, with significant local variations, and indicate that extension weakened 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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Section: Discussion: Decratonization Terrane Dispersion and Reworkinmentioning

confidence: 99%

Section: Discussion: Decratonization Terrane Dispersion and Reworkinmentioning

confidence: 99%

Decratonization by rifting enables orogenic reworking and transcurrent dispersal of old terranes in NE Brazil

Ganade

Weinberg

Caxito

et al. 2021

Sci Rep

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“…It is also possible to recognize signatures of speci c sections of the SFC in the old blocks now within the BP. For example, the geological features of the Gavião Block in the SFC can be found in blocks within the Central and Northern Borborema Province 36,38,53 . These features include rare occurrences of Paleoarchean rocks (>3.…”

Section: Discussion: Decratonization Terrane Dispersion and Reworkingmentioning

confidence: 99%

“…Ga high-grade metamorphism53,54 . We conclude that deformation of craton margin blocks, such as the Entremontes block, into the sigmoidal-shaped Alto Moxotó terrane within the Borborema Province, illustrates how a number of other Archean-Paleoproterozoic blocks may have been pulled away from the original craton to form inliers within the orogeny.…”

mentioning

confidence: 99%

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 Gavião Block is composed of orthogneiss tonalitic-granodioritic associations gneissicamphibolite at times migmatized and metavolcanic sedimentary similar to greenstone belt sequences which possibly have their origin from the partial fusion of the ocean protrocrust, turning into one of the most ancient rocks of Latin American aging between 3.4 -3.6 Ga, through the zircon U-Pb data (Bastos-Leal, 1998;Barbosa et al, 2012;Dantas et al, 1997;Oliveira et al, 2020).…”

Section: Geological Settingmentioning

confidence: 99%

U-Pb Geochronology Zircon (La-Icp-Ms) Data of the Gneissic-Migmatitic Complex of Salvador-Esplanada-Boquim Belt, São Francisco Craton, Brazil/Geocronologia U-Pb (La-Icp-Ms) Em Zircões Do Complexo Gnáissico-Migmatítico Do Cinturão Salvador-Esplanada-Boquim, Cráton Do São Francisco, Brasil

Junior

Leal

Barbosa

et al. 2020

BJD

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The Salvador-Esplanada-Boquim Belt (SEBB) is considered a branch of the São Francisco Craton, located in its northeastern portion, in the Brazilian states of Bahia and Sergipe. This paper analyzed the U-Pb (LA-ICP-MS) geochronology on the Gneissic-Migmatitic Complex (GMC) zircons in the rocks of the SEBB. Six analyses were made on the rocks of GMC and two on granitic dykes. The obtained data allowed concluding that the GMC rocks were formed between 2150 ± 19 -2188 ± 30 Ma, while the dykes had their crystallization in line with the process of regional metamorphism in 2073 Ma. These metamorphic evens are interpreted as products of the collision with the Serrinha Block, provoking deformation, compression and uplifting of these rocks. After eroded, the granulitic roots of SEBB were exhumed, stabilizing on the way it is today with the GMC rocks, located on east and west of the Esplanada-Boquim Granulitic Complex.

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Birthplace of the São Francisco Craton, Brazil: Evidence from 3.60 to 3.64 Ga Gneisses of the Mairi Gneiss Complex

Abstract: This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as

Cited by 43 publications

References 36 publications

Decratonization by rifting enables orogenic reworking and transcurrent dispersal of old terranes in NE Brazil

Decratonization by rifting enables orogenic reworking and transcurrent dispersal of old terranes in NE Brazil

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

U-Pb Geochronology Zircon (La-Icp-Ms) Data of the Gneissic-Migmatitic Complex of Salvador-Esplanada-Boquim Belt, São Francisco Craton, Brazil/Geocronologia U-Pb (La-Icp-Ms) Em Zircões Do Complexo Gnáissico-Migmatítico Do Cinturão Salvador-Esplanada-Boquim, Cráton Do São Francisco, Brasil

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