A solid geology map was prepared for the study region, based on the aeromagnetic survey and geological mapping of the region. The geological-structural analysis of the aeromagnetic survey has identified circular features interpreted as anular fractures associated with eruptive centres. The Brea eruptive centre is of shallow nature; there is no evidence of the occurrence of an associated subvolcanic body; it is located in a structurally favourable setting characterized by the intersection of a submeridional thrust and a system of NE-trending fractures; its age is assigned to the Eocene and it is located in a back-arc setting, considering the location of the contemporaneous volcanic-arc deposits. The Zancarrón eruptive centre is regarded as a volcanic caldera, an observation which is consistent with the geological evidences of the presence of a Miocene strato-volcano in this region. There is geophysical evidence that indicates Oligocene volcanic rocks underlying the core of the eruptive centre, which suggests that its magmatic activity would have started during the Oligocene; in this case, the Zancarrón eruptive centre would represent an additional centre of the Doña Ana Group (Oligocene) similar to the one recognized within the Chilean territory. Based on the association of this group with mineralised hydrothermal alteration zones within the Valle del Cura region, the possible identification of covered Oligocene volcanic rocks may be of a special interest for mining exploration.Se genero un mapa de geologia solida para el sector central del Valle del Cura mediante la combinacion de informacion aeromagnetica y mapeo geologico. El analisis geologico-estructural del levantamiento aeromagnetico permitio identificar rasgos circulares interpretados como fracturas anulares asociadas a centros eruptivos. El centro eruptivo de la Brea es de caracter somero, no existiendo evidencias de la ocurrencia de un cuerpo subvolcanico asociado al mismo; esta implantado en un area estructuralmente favorable, dada por la interseccion de un corrimiento submeridiano de primer orden y un sistema de fracturas transversales noreste; su edad se asigna al Eoceno y se encontraria en una posicion de retroarco respecto de los depositos eruptivos de arco de la misma edad. El centro eruptivo del Zancarron se considera como una caldera volcanica, observacion consistente con los indicios geologicos de la presencia de un estratovolcan mioceno en esta region. Hay evidencias geofisicas que indican que volcanitas oligocenas subyacen a las volcanitas miocenas en el nucleo del centro eruptivo, lo cual permite considerar que la actividad magmatica del mismo habria comenzado en el Oligoceno; asi, el centro eruptivo del Zancarron seria un centro adicional al ya reconocido en territorio chileno para el Grupo Dona Ana, delimitandose la extension del frente volcanico oligoceno. Habida cuenta de la asociacion de este grupo con zonas de alteracion hidrotermal mineralizadas en el Valle del Cura, la identificacion de sectores con posible presencia de volcanitas oligocenas no aflorantes en la region resulta de interes para orientar la exploracion minera en la region.