Open AccessPrecambrian tectonic inheritance control of the NE Brazilian continental margin revealed by Curie point depth estimation
Author(s) -
Jefferson Tavares Cruz Oliveira,
José Antônio Barbosa,
David Lopes de Castro,
Paulo de Barros Correia,
José Ricardo Gonçalves Magalhães,
Osvaldo José Correia Filho,
Bruno Varela Buarque
Publication year - 2021
Publication title -
annals of geophysics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 60
eISSN - 2037-416X
pISSN - 1593-5213
DOI - 10.4401/ag-8424
Subject(s) - geology , continental margin , geothermal gradient , tectonics , precambrian , passive margin , continental crust , crust , oceanic crust , oceanic basin , basement , shield , sedimentary basin , geophysics , seismology , geomorphology , petrology , paleontology , subduction , rift , civil engineering , engineering
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