Aplicación gravimétrica para definir la estructura cortical del basamento de la cuenca sedimentaria Malacatos Vilcabamba

Abstract

Abstract: The study focuses on the Malacatos-Vilcabamba basin, using geophysical methods (gravimetry), geological and structural survey. The integration of these data allowed defining the geometry of the sedimentary fill and its correlation with the geological structures as a result of the uplift of the Andes Mountain range. Previous studies carried out by Tamay et al. (2016) determine negative Bouguer anomalies of -187 to -204 mGal and residual anomalies between -4 to -5 mGal with a thickness of 600 meters. The 2D gravimetric models obtained by collecting data in five profiles in a North-South and East-West direction with a total of 362 gravimetric stations separated at 200 meters between each point, recording values between -186 to -208 mGal, which determines a distribution irregular sedimentary fill with a residual anomaly of up to - 6.5 mGal. Therefore, it is determined that the sedimentary fill between Malacatos and Vilcabamba has a thickness of 900 meters, which correlates with the folded structures of the Cerro Mandango Formation and inferred faults determined on the eastern edge of the basin.Key words: Bouguer anomaly, gravity model, sedimentary fill.