Thermal waters of “tectonic origin”: the alkaline, Na-HCO3 waters of the Rio Valdez geothermal area (Isla Grande de Tierra del Fuego, Argentina)
DOIAbstract
none5siThe geothermal area of Rio Valdez is located in the central portion of the Isla Grande de Tierra del Fuego (South Argentina), ten kilometers south of the southeastern sector of the Fagnano Lake. It consists of a series of thermal springs with low discharge rates (£1 L⁄ s) and temperatures in the range of 20–33C distributed in an area of <1 km2. The thermal springs are characterized by alkaline, Na-HCO3 waters with low salinity (0.53‚0.58 g ⁄ L), but relatively high fluoride contents (up to 19.4 mg⁄ L). Their composition is the result of a slow circulation at depth, possibly through deep tectonic discontinuities connected with the Magallanes-Fagnano Fault (MFF) system. According to geothermometric calculations, thermal waters reach te...
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