Crustal Framework Of The Southern Part Of The São Francisco Craton,Brazil, Based On Airborne Geophysical Data

Systematic mapping in the southern part of the São Francisco Craton (SFC) is cumbersome due to the lack of continuous outcrops in the region. Deep soils and weathered rocks obscure the relationship between key metamorphic complexes and supracrustal sequences that occupy such terrains. This poses a problem for reconstruction of tectonic settings and the understanding of the geodynamical history of this region.<br>The high-resolution airborne survey acquired during the Pitangui- Ipatinga- São João Del Rey project is now providing a set of geological information in the SFC previously unavailable for any geologist in the field. The survey was acquired using 250m spaced flight lines with orthogonal tie lines flown every 2.500m. In this work, these data was interpolated in a regular grid, using 100m on a side, resampled at 50 m. Microlleveling and decorrugation techniques were further applied to the data, producing several geophysical products for geologic analysis and interpretation.<br>Images derived from the Pitangui-Ipatinga São João Del Rey project provided new insights about the tectonic assembly of the SFC throughout the Precambrian. Combined gamaspectrometric-magnetic images portrayed the lateral continuity and the internal structure of several terranes, particularly the location and geometry of terrane boundaries.