This paper presents an alternative way for mapping in highly weathered terrains using derivative products of high-density airborne geophysical data and their integration with geological data. The new products allowed a better definition of important geological features and supported the geological mapping in 1:100.000 scale. The region of Cláudio, south part of São Francisco Craton is comprised by Archean granite-gneissic terrains (TTG), an amphibolite unit and a supracrustal unit comprised by ultramafic rocks, amphibolites, schists, garnet-sillimanite quartzite and banded iron formation. The integrated approach incorporates the use of Ipatinga São João Del Rey airborne geophysical project and remote sensing data (Landsat-7/ Enhanced Thematic Mapper plus (ETM+)). The derivative products were grounded-checked to examine the efficiency of the magnetic and gamma-ray responses to delineate geological domains. The magnetometric maps provided information to the structural framework and about specific lithological units like mafic and ultramafic bodies, while the gamaespectrometric data brought strong insights about lithological units and boundaries. The data integration, which presents the geophysical and geomorphological characteristics of the lithological groups, shows high potential to better define geological contacts and tectonic structures in highly weathered Archean terrains.
airborne geophysics; digital image processing; weathered terrains and remote sensing data
