The hydrothermal system of the Domuyo volcanic complex (Argentina): A conceptual model based on new geochemical and isotopic evidences

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