GEOPHYSICAL CHARACTERIZATION OF THE MAIN INTRUSIONS AND ASSOCIATED MINERAL DEPOSITS IN THE EL BATAMOTE AREA, CENTRAL SONORA

The Batamote area is located in the central portion Sonora, Mexico, located approximately 25 m north of Hermosillo, covering an area of 900 km². The geology in the area consists of Paleozoic, Mesozoic (Lower Jurassic and Upper Cretaceous) and Cenozoic rocks. The Larámide orogeny event caused large intrusive bodies of granitic-granodioritic composition to affect all pre-existing rock sequences, creating alterations and subsequent hydrothermal and metasomatic processes. Volcanic events in the Mid Tertiary originated rocks with intermediate composition, which are interrupted by The Basin and Range distensive event with NW-SE normal faults, depositing detritic sequences in the lower part as well as mafic volcanism.

The data of the complete Bouguer anomaly were processed, to perform the regional-residual separation using the Zeng Method (1989) and to correlate it with the geology of the area. The results show gravimetric anomalies oriented NW-SE, low gravimetric anomalies that corresponds to a basin and high gravimetric anomalies that corresponds to intrusive and metamorphic rocks. The geological models proposed based on gravimetry indicate horst and grabens type structures formed by normal type faults with orientation NW-SE. The maximum thickness of the sedimentary fill is located in the northern part of the study area with an approximate value of 1000m.

The reduction to the pole of the aeromagnetic data was carried out and different mathematical filters were applied to define the magnetic domains and correlate them with the geology. This process shows a high magnetic anomalie in the North-Central part of the area, reflecting a structure with good magnetic response covered by sediments, which may be of economic interest.

There are also geological and geophysical conditions that can be framed in a magmatic-metallogenetic model of a porphyry copper system, due to the presence of skarns and veins.