The architecture of the Eopaleozoic Cococi Basin, northeastern Brazil: 2D geological modelling from magnetic and gravimetric data

Abstract

Cococi Basin is a small Eopaleozoic syneclise that is overlying basement rocks of the Neoproterozoic Central Cear´ a Domain of the Borborema Province, northeastern Brazil. Its origin is associated with the final stages of the Brasiliano orogenic cycle (600 My). The Basin classified as rift type has its basement constituted by rocks of the Canind´ e Unit and the crosshead complex and delimited by Senador Pompeu and Taua´ shear zones. Three geophysical cross-sections were created using aero-magnetometric and field gravimetric data, aiming to outline the litho-structural underground features of the Basin. We have used the following methods for processing and interpreting geophysical data: minimum curvature, analytic signal amplitude, Euler deconvolution, and 2D modeling. The obtained depth solutions were interpreted and combined with geological data to generate geological models featuring the limits and depth of the Basin, its internal main structures, and its lithological variations. The developed geophysical-based geological modeling unravels the yet unknown geological features of the Cococi Basin, which corroborates with geological field observations, surface mapping and the results of previous investigations.