Hydrogeochemistry of the thermal waters from the Sciacca Geothermal Field (Sicily, southern Italy)

The Sciacca basin (southern Sicily, Italy), well known since the Roman times for the importance of its thermo-mineral waters, is characterized by a large occurrence of thermal fluid discharges whose main thermal aquifer is located within the Triassic carbonate rocks. This reservoir represents the deepest formation cropping out in the area. Shallower and cooler thermal aquifers are located within the Tertiary limestone and Quaternary sand and gravel deposits. In this work new geochemical and isotopic data of thermal waters and dissolved gases from springs and wells were investigated to assess the origin of thermal fluids and the structure of the hydrothermal system.