The Domuyo volcanic system: An enormous geothermal resource in Argentine Patagonia

Sergio Calabrese, Caterina Liccioli, Mariano Agusto, Stefano Caliro, Franco Tassi, Walter D'Alessandro, Orlando Vaselli, Alberto Caselli, Giovanni Chiodini

Risultato della ricerca: Articlepeer review

22 Citazioni (Scopus)

Abstract

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 drain- age of the area (Rio Varvarco). A dramatic increase of the most conservative species such as Na, Cl and Li from the Rio Varvarco from upstream to downstream was 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 is much 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.
Lingua originaleEnglish
pagine (da-a)71-77
Numero di pagine7
RivistaJournal of Volcanology and Geothermal Research
Volume274
Stato di pubblicazionePublished - 2014

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

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