The study present the use of Geographic Information System (GIS) to assess the geotectonic regimen of the Sabinas Basin. Initially, the GIS database was designed using geological and geophysical information (total magnetic field reduced to the pole). Subsequently, 2D models of the basin were obtained along 4 profiles running on a north-south direction. The implementation of GIS enables a geological-geophysical interpretation generating various thematic maps that overlap the magnetic map during interpretation. The analysis of overlapping maps enables the identification of areas with different geotectonic regimes in the Sabinas Basin, as well as the relationship between these environments and mineralization. The qualitative and quantitative interpretation of the aeromagnetic data obtained for the total magnetic field reduced to the pole delineate uplifted basement areas as well as shallower blocks within them. This paper presents the location of both the basin´s deepest zones and its probable faults, which can be linked to the block boundaries. The faults zones and block boundaries correspond to the main mineral deposits found in the basin. Finally, the geotectonic regime of some sectors of the basin is detailed in order to reaffirm the results obtained by the interpretation of aeromagnetic data. Se presenta el uso de un Sistemas de Información Geográfica para evaluar el régimen geotectónico de la Cuenca de Sabinas. Inicialmente se llevó a cabo el diseño de la base de datos del Sistema de Información Geográfica, teniendo en cuenta las características de la información geológica y geofísica (campo magnético total reducido al polo). Posteriormente se obtienen modelos 2D de la cuenca a lo largo de 4 perfiles con direcciones norte-sur. A partir de la implementación del Sistema de Información Geográfica, se logró una interpretación geológica-geofísica, generando diversos mapas temáticos que se superpusieron al mapa magnético durante dicha interpretación. El análisis de los mapas superpuestos permitió identificar áreas con diferente régimen geotectónico dentro de la Cuenca de Sabinas, así como la relación de esas áreas con mineralizaciones. A partir de la interpretación cualitativa y cuantitativa de los datos del campo magnético total reducido al polo se delimitan áreas levantadas del basamento de la cuenca y los bloques más someros dentro de las mismas. También se localizan las zonas más profundas de la cuenca y probables fallas, que pueden estar vinculadas con los límites de los bloques. Las zonas de fallas y los límites de bloques están relacionados con los principales depósitos minerales de la cuenca. Por último, se detalla el régimen geotectónico de algunos sectores de la cuenca, para reafirmar los resultados de la interpretación de los datos aeromagnéticos. ABSTRACT RESUMEN

Gravity data were measured along the extension of the Itaparica Island. In this region, the limit between Recôncavo and Camamu basins, characterized by the Barra Fault System, is located. These data correspond to previously corrected Bouguer anomaly values and they were processed in order to separate the residual component of the anomaly from its regional component. Gravity maps were created and through its analysis the regional gravity variations of subsurface rocks could be identified. A horizontal gradient filter was applied to the data, allowing the identification of the main and secondary components of the Barra Fault System and of transform faults related to the continental separation process that originated the Eocretaceous Brazilian rift basins. Bidimensional gravity models were created using geological and geophysical data obtained from well logs and from previously interpreted seismic sessions. Gravity interpretation provided an improvement to previous assumptions regarding the basement's depth values. This joint interpretation scheme permitted a further investigation of structural features of the aforementioned basins and complemented the seismic interpretations in regions characterized by low seismic resolution.