DADOS AEROMAGNÉTICOS APLICADOS NA INTERPRETAÇÃO DO ARCABOUÇO ESTRUTURAL DA PORÇÃO NORDESTE DA PROVÍNICA BORBOREMA, NE BRASIL

This paper reports processing techniques applied to airborne magnetic data to generate themes that could be used as a tool do delimitate the boundaries and the tectonic framework in the northeastern portion of the Borborema Province in NE Brazil. Data processing result in the generation of anomalous magnetic map, residual magnetic field, allowing to generate the horizontal gradient zero order, amplitude and inclination of the analytical signal (zero order), and Euler deconvolution for different structural index. Preliminary results show enhancement of main tectonic structures and boundaries of crustal blocks present in the region. Also, was able to quantify the major shear zones that define the framework of the Borborema Province, and to identify important features not present on actual maps. Magnetic anomalies correlated to different crustal blocks indicate the depth extension of the archean nuclei São José do Campestre to S-SW. Also, it was shown different magnetic signature as for the paleoproterozoic rocks, low magnetic response for the Seridó Belt and also distinct signatures for the pre- and syn-brasiliano granites compared to the pos-tectonic granites.