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Authors: Tassi, F.* 
Liccioli, C.* 
Agusto, M.* 
Chiodini, Giovanni* 
Vaselli, O.* 
Calabrese, S.* 
Pecoraino, Giovannella* 
Tempesti, L.* 
Caponi, C.* 
Fiebig, J.* 
Caliro, Stefano* 
Caselli, A.* 
Title: The hydrothermal system of the Domuyo volcanic complex (Argentina): A conceptual model based on new geochemical and isotopic evidences
Issue Date: 2016
Series/Report no.: /328 (2016)
DOI: 10.1016/j.jvolgeores.2016.11.003
Abstract: The Domuyo volcanic complex (Neuquén Province, Argentina) hosts one of the most promising geothermal systems of Patagonia, giving rise to thermal manifestations discharging hot and Cl−-rich fluids. This study reports a complete geochemical dataset of gas andwater samples collected in three years (2013, 2014 and 2015) fromthe main fluid discharges of this area. The chemical and isotopic composition (δD-H2O and δ18O-H2O) of waters indicates that rainwater and snowmelting are the primary recharge of a hydrothermal reservoir located at relative shallowdepth (400–600m) possibly connected to a second deeper (2–3 km) reservoir. Reactive magmatic gases are completely scrubbed by the hydrothermal aquifer(s), whereas interaction of meteoric waters at the surface causes a significant air contamination and dilution of the fluid discharges located along the creeks at the foothill of the Cerro Domuyo edifice. Thermal discharges located at relatively high altitude (~3150 m a.s.l.), namely Bramadora, are less affected by this process, as also shown by their relatively high R/Ra values (up to 6.91) pointing to the occurrence of an actively degassing magma batch located at an unknown depth. Gas and solute geothermometry suggests equilibrium temperatures up to 220–240 °C likely referred to the shallower hydrothermal reservoir. These results, confirming the promising indications of the preliminary surveys carried out in the 1980′s, provide useful information for a reliable estimation of the geothermal potential of this extinct volcanic system, although a detailed geophysical measurements
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