Deformation and chronology of the granitic magmatism associated with the Tauá and Senador Pompeu shear zones (Borborema Province, NE, Brazil)

• Grant number: 16/22226-9
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• Start date: July 01, 2017
• End date: October 11, 2021
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geology
• Principal Investigator: Carlos José Archanjo
• Grantee: Carlos Fernando Ávila Rodrigues
• Host Institution: Instituto de Geociências (IGC). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated scholarship(s): 19/10167-6 - Electron Backscatter Diffraction (EBSD) analysis of deformation microstructures - Constraining rheology and deformation conditions of northern Borborema Province (NE Brazil), BE.EP.DD

Abstract

Amongst the most significant tectonic features of the Borborema Province (NE Brazil) are the widespread transcurrent shear systems and expressive granitic magmatism. The chronological record between the magmatism and deformation mechanisms is only locally known. In the state of Ceará two regional scale shear zones, Senador Pompeu and Tauá, deform the crystalline basement and give rise, in the tractional sites, to emplacement of plutons and dyke swarms, as well as late-stage molassic sedimentary basins basins. Granitic plutons and dyke swarms would have been emplaced in the tractional sites of such system, along with the formation of late-orogenic sedimentary basins. However, there is not sufficient structural and geochronological data for an accurate demonstration of how magmatism and deformation are related. Furthermore, the deformation mechanisms are still poorly known. These mechanisms encompass ductile to brittle-ductile conditions as a result of exhumation of the province. In this project, we intend to investigate the connection between magmatism and the deformation mechanisms involved in the ductile to brittle-ductile transition. We will use dykes and ring intrusive of the Tauá shear zone, as well as the fault systems that limit the Cococi basin in the merge of the Tauá-Senador Pompeu shear zones, as reference for the study. This result will allow estimation of the chronology of the events and of parameters consistent with the pressure, temperature and strain rate conditions that shaped the province in the Neoproterozoic. (AU)

Scientific publications

(5)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

AVILA, CARLOS F.; ARCHANJO, CARLOS J.; FOSSEN, HAAKON; HOLLANDA, MARIA HELENA B. M.. Zippered Shear Zone Model for Interacting Shear Zones in the Borborema Province, Brazil, as Constrained by U-Pb Dating. TECTONICS, NOV 2019. (17/21440-0, 16/22226-9)

AVILA, CARLOS F.; ARCHANJO, CARLOS J.; HOLLANDA, MARIA HELENA B. M.; DE MACEDO FILHO, ANTOMAT A.; LEMOS-SANTOS, V, DANIEL DO. Shear zone cooling and fabrics of synkinematic plutons evidence timing and rates of orogenic exhumation in the northwest Borborema Province (NE Brazil). Precambrian Research, v. 350, NOV 2020. (19/10167-6, 17/21440-0, 16/22226-9)

DE MACEDO FILHO, ANTOMAT AVELINO; HOLLANDA, MARIA HELENA B. M.; ARCHANJO, CARLOS JOSE; AVILA, CARLOS FERNANDO; OLIVEIRA, ALISSON LOPES. Unraveling the tectonic setting and crystallization history of the Equatorial Atlantic Magmatic Province. TECTONOPHYSICS, v. 858, p. 23-pg., 2023-05-10. (17/13130-0, 16/22226-9)

AVILA, CARLOS F.; ARCHANJO, CARLOS J.; FOSSEN, HAAKON; HOLLANDA, MARIA HELENA B. M.. Zippered Shear Zone Model for Interacting Shear Zones in the Borborema Province, Brazil, as Constrained by U-Pb Dating. TECTONICS, v. 38, n. 11, p. 16-pg., 2019-11-19. (16/22226-9, 17/21440-0)

AVILA, CARLOS F.; ARCHANJO, CARLOS J.; PLATT, JOHN P.; FOSSEN, HAAKON. Rheology, shear zone width, microstructural evolution and tectonics of a zippered strike-slip shear zone: The Senador Pompeu shear zone, northern Borborema Province, Brazil. JOURNAL OF STRUCTURAL GEOLOGY, v. 166, p. 23-pg., 2022-12-22. (19/10167-6, 17/21440-0, 16/22226-9)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

RODRIGUES, Carlos Fernando Ávila. Evolução estrutural, reologia e magmatismo associado à tectônica transcorrente no Domínio Ceará Central, Província Borborema. 2022. Doctoral Thesis - Universidade de São Paulo (USP). Instituto de Geociências (IG/BT) São Paulo.