Carbonate U-Pb dating of samples from rift-bounding faults of intracontinental basins in the Borborema province, northeastern Brazil, indicate recurrent tectonic activity during Pangea breakup lasting for >150 m.y. from the Late Triassic to the Paleocene, reactivating inherited strike-slip Neoproterozoic–Cambrian shear zones. Triassic ages indicate that brittle deformation started some 80 m.y. before previously known, most likely related to rifting along the incipient Central Atlantic. The subsequent Cretaceous opening of the South Atlantic caused renewed fault activity during rifting and basin development. Furthermore, recurrent Cenozoic tectonic activity along the rift-bounding faults is indicated, suggesting that structural inheritance of the Neoproterozoic–Cambrian continental-scale Borborema shear zone system has been responsible for accommodation of recurrent tectonic stress from Mesozoic rifting to the present day.
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Research Article|
May 12, 2022
Recurrent tectonic activity in northeastern Brazil during Pangea breakup: Constraints from U-Pb carbonate dating
Carlos E. Ganade;
Carlos E. Ganade
1
Center of Applied Geosciences (CGA), Geological Survey of Brazil, 22290-255 Rio de Janeiro–RJ, Brazil
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Caue R. Cioffi;
Caue R. Cioffi
1
Center of Applied Geosciences (CGA), Geological Survey of Brazil, 22290-255 Rio de Janeiro–RJ, Brazil2
Institute of Geosciences, University of São Paulo, 05508-080 São Paulo–SP, Brazil
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João Pacífico Machado;
João Pacífico Machado
1
Center of Applied Geosciences (CGA), Geological Survey of Brazil, 22290-255 Rio de Janeiro–RJ, Brazil
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Tiago Miranda;
Tiago Miranda
3
Department of Geology, Federal University of Pernambuco, 50740-530 Recife–PE, Brazil
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Leonardo B. Lopes;
Leonardo B. Lopes
1
Center of Applied Geosciences (CGA), Geological Survey of Brazil, 22290-255 Rio de Janeiro–RJ, Brazil
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Roberto F. Weinberg;
Roberto F. Weinberg
4
School of Earth, Atmosphere and Environment, Monash University, Clayton, VIC 3800, Australia
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Maria Alcione Celestino;
Maria Alcione Celestino
3
Department of Geology, Federal University of Pernambuco, 50740-530 Recife–PE, Brazil
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Bruno Carvalho;
Bruno Carvalho
5
Centro de Pesquisas Leopoldo Américo Miguez de Mello (Cenpes), Petrobras, 21941-915 Rio de Janeiro–RJ, Brazil
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Marcel Guillong;
Marcel Guillong
6
Department of Earth Sciences, ETH Zurich, 8092 Zurich, Switzerland
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Nick M.W. Roberts
Nick M.W. Roberts
7
Natural Environment Research Council (NERC) Isotope Geosciences Laboratory, British Geological Survey, Nottingham NG12 5GG, UK
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Geology (2022)
Article history
received:
12 Jan 2022
rev-recd:
28 Mar 2022
accepted:
29 Mar 2022
first online:
12 May 2022
Citation
Carlos E. Ganade, Caue R. Cioffi, João Pacífico Machado, Tiago Miranda, Leonardo B. Lopes, Roberto F. Weinberg, Maria Alcione Celestino, Bruno Carvalho, Marcel Guillong, Nick M.W. Roberts; Recurrent tectonic activity in northeastern Brazil during Pangea breakup: Constraints from U-Pb carbonate dating. Geology 2022; doi: https://doi.org/10.1130/G50032.1
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