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

Abstract 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 Gondwa...

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Autores principales:	Carlos E. Ganade, Roberto F. Weinberg, Fabricio A. Caxito, Leonardo B. L. Lopes, Lucas R. Tesser, Iago S. Costa
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e39b9c6d22a84c7dbdc425b702b51e8a
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spelling	oai:doaj.org-article:e39b9c6d22a84c7dbdc425b702b51e8a2021-12-02T13:20:23ZDecratonization by rifting enables orogenic reworking and transcurrent dispersal of old terranes in NE Brazil10.1038/s41598-021-84703-x2045-2322https://doaj.org/article/e39b9c6d22a84c7dbdc425b702b51e8a2021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-84703-xhttps://doaj.org/toc/2045-2322Abstract 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.Carlos E. GanadeRoberto F. WeinbergFabricio A. CaxitoLeonardo B. L. LopesLucas R. TesserIago S. CostaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Carlos E. Ganade Roberto F. Weinberg Fabricio A. Caxito Leonardo B. L. Lopes Lucas R. Tesser Iago S. Costa Decratonization by rifting enables orogenic reworking and transcurrent dispersal of old terranes in NE Brazil
description	Abstract 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.
format	article
author	Carlos E. Ganade Roberto F. Weinberg Fabricio A. Caxito Leonardo B. L. Lopes Lucas R. Tesser Iago S. Costa
author_facet	Carlos E. Ganade Roberto F. Weinberg Fabricio A. Caxito Leonardo B. L. Lopes Lucas R. Tesser Iago S. Costa
author_sort	Carlos E. Ganade
title	Decratonization by rifting enables orogenic reworking and transcurrent dispersal of old terranes in NE Brazil
title_short	Decratonization by rifting enables orogenic reworking and transcurrent dispersal of old terranes in NE Brazil
title_full	Decratonization by rifting enables orogenic reworking and transcurrent dispersal of old terranes in NE Brazil
title_fullStr	Decratonization by rifting enables orogenic reworking and transcurrent dispersal of old terranes in NE Brazil
title_full_unstemmed	Decratonization by rifting enables orogenic reworking and transcurrent dispersal of old terranes in NE Brazil
title_sort	decratonization by rifting enables orogenic reworking and transcurrent dispersal of old terranes in ne brazil
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/e39b9c6d22a84c7dbdc425b702b51e8a
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Decratonization by rifting enables orogenic reworking and transcurrent dispersal of old terranes in NE Brazil

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