Aplicação de georadar (GPR) para a caracterização de frentes de cavalgamento na região da Serra da Matriculada, município de Datas (MG)

Abstract

Georadar(GPR) corresponds to a geophysical method that, among other applications, has been used in the mapping of subsurface geological features. Thus, this technique was used for the structural characterization of lithotypes in Serra da Matriculada, Datas (MG). Two profiles with E-W direction and one with N-S direction were performed, perpendicular to the shear zones responsible for stratigraphic inversions. Among the characteristics observed in radargrams, two patterns of continuous reflection stand out: (1) inclination towards the east quadrants, consistent with the foliation planes of the outcropping lithotypes and (2) oblique to the first reflectors, correlated to the family of fractures with direction NS and dive to the west quadrants. The profile with N-S direction indicates a normal fault, responsible for the absence of correlated lithotypes to Barão do Guaicuí Formation and Gouveia Complex in the southern portion of the area. The limitations associated with the use of GPR are the presence of lithotypes withconductive electrical characteristics and, locally, of electromagnetic noise.