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Liccioli, C.
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- PublicationRestrictedThe hydrothermal system of the Domuyo volcanic complex (Argentina): A conceptual model based on new geochemical and isotopic evidences(2016)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ;; ; ;; ; ; ;; 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 measurements167 2 - PublicationRestrictedThe Domuyo volcanic system: An enormous geothermal resource in Argentine Patagonia(2014-01)
; ; ; ; ; ; ; ; ; ;Chiodini, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Liccioli, C.; Universidad Nacional Rio Negro, Argentina ;Vaselli, O.; Dipartimento di Scienze della Terra, Università di Firenze, Italy ;Calabrese, S.; Università di Palermo, Dipartimento DiSTeM ;Tassi, F.; Dipartimento di Scienze della Terra, Università di Firenze, Italy ;Caliro, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Caselli, A.; Universidad Nacional Rio Negro, Argentina ;Agusto, M.; Universidad Nacional Buenos Aires, Argentina ;D'Alessandro, W.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia; ; ; ; ; ; ; ; A geochemical survey of the main thermal waters discharging in the southwestern part of the Domuyo volcanic complex (Argentina),where the latest volcanic activity dates to 0.11 Ma, has highlighted the extraordinarily high heat loss from this remote site in Patagonia. The thermal water discharges are mostly Na-Cl in composition and have TDS values up to 3.78 g L−1 (El Humazo). A simple hydrogeochemical approach shows that 1,100 to 1,300 kg s−1 of boiling waters, which have been affected by shallow steam separation, flow into the main drainage of the area (Rio Varvarco). A dramatic increase of the most conservative species such as Na, Cl and Li from the Rio Varvarco fromupstreamto downstreamwas observed and related solely to the contribution of hydrothermal fluids. The equilibrium temperatures of the discharging thermal fluids, calculated on the basis of the Na-K-Mg geothermometer, are between 190 °C and 230 °C. If we refer to a liquid originally at 220 °C (enthalpy = 944 J g−1), the thermal energy release can be estimated as high as 1.1±0.2 GW, a value that ismuch higher than the natural release of heat in other important geothermal fields worldwide, e.g., Mutnovsky (Russia), Wairakei (New Zealand) and Lassen Peak (USA). This value is the second highest measured advective heat flux from any hydrothermal system on Earth after Yellowstone.245 44