Precambrian tectonic inheritance control of the NE Brazilian continental margin revealed by Curie point depth estimation

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Jefferson Tavares Tavares Cruz Oliveira
José Antonio Antonio Barbosa
https://orcid.org/0000-0001-8754-6310
David Lopes de Castro
Paulo de Barros Correia
José Ricardo Gonçalves Magalhães
Osvaldo José Correia Filho
Bruno Varela Buarque

Abstract

An investigation of Curie point depths (CPD) based on spectral analysis of airborne magnetic data was carried out in the NE Brazilian continental margin. The studied region represents a narrow hyper-extended margin with three sedimentary basins. Regional geothermal gradient and heat flow were also calculated. CPD results were integrated with interpretation of 2D deep seismic data and with estimated isostatic Moho depths. The results reveal that the narrow hyper-extended crust is 150 km wide in the southern sector and 80 km wide in the north, with a narrow ocean-continental transition (OCT) zone that varies from 50 km wide in the south sector to 30 to 20 km wide in the north. The CPD isotherm showed the strong influence of the three main continental blocks of Borborema ́s Shield in the tectonic evolution of the three marginal basins. The CPD analysis corroborated models provided by gravimetric data and successfully demonstrated the sharp control of basement compartments on the thermal properties of the marginal basins domains

Article Details

How to Cite
1.
Cruz Oliveira JTT, Barbosa JAA, de Castro DL, Correia P de B, Magalhães JRG, Correia Filho OJ, Buarque BV. Precambrian tectonic inheritance control of the NE Brazilian continental margin revealed by Curie point depth estimation. Ann. Geophys. [Internet]. 2021May26 [cited 2021Sep.27];64(2):GT213. Available from: https://www.annalsofgeophysics.eu/index.php/annals/article/view/8424
Section
Geodynamics and Tectonophysics
Author Biographies

José Ricardo Gonçalves Magalhães, Federal University of Recôncavo ,Exact and Technology Sciences Center

Federal University of Pernambuco, Department of Geology

Osvaldo José Correia Filho

Federal University of Pernambuco, Department of Geology

Bruno Varela Buarque

Universidade Federal de Pernambuco, Departamento de Geologia