Thermal waters of 'tectonic origin': The alkaline, Na-HCO3 waters of the Rio Valdez geothermal area (Isla Grande de Tierra del Fuego, Argentina)

The 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 (≤1L/s) and temperatures in the range...

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Autores principales: Capaccioni, B., Menichetti, M., Renzulli, A., Tassone, A., Huertas, A.D.
Formato: JOUR
Materias:
Argentina
Geochemistry of thermal fluids
Geothermal areas
Tectonics
Tierra del Fuego
alkali feldspar
bicarbonate
country rock
discharge
fluorine
geothermal energy
geothermometry
graywacke
infiltration
isotopic composition
metapelite
salinity
snowmelt
sodium
tectonics
thermal spring
thermal water
Fagnano Lake
Isla Grande de Tierra del Fuego
Tierra del Fuego [(ARC) South America]
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_14688115_v13_n1_p21_Capaccioni
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_14688115_v13_n1_p21_Capaccioni2023-10-03T16:17:28Z Thermal waters of 'tectonic origin': The alkaline, Na-HCO3 waters of the Rio Valdez geothermal area (Isla Grande de Tierra del Fuego, Argentina) Capaccioni, B. Menichetti, M. Renzulli, A. Tassone, A. Huertas, A.D. Argentina Geochemistry of thermal fluids Geothermal areas Tectonics Tierra del Fuego alkali feldspar bicarbonate country rock discharge fluorine geothermal energy geothermometry graywacke infiltration isotopic composition metapelite salinity snowmelt sodium tectonics thermal spring thermal water Argentina Fagnano Lake Isla Grande de Tierra del Fuego Tierra del Fuego [(ARC) South America] The 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 (≤1L/s) and temperatures in the range of 20-33°C distributed in an area of <1km2. The thermal springs are characterized by alkaline, Na-HCO3 waters with low salinity (0.53÷0.58g/L), but relatively high fluoride contents (up to 19.4mg/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 temperatures in the range of 100-150°C and an almost complete chemical equilibrium with the alkali-feldspars in the metavolcanic country rocks. The relatively high fluorine contents can be explained by the slow ascent and cooling of deep groundwaters followed by a progressive re-equilibration with F-bearing, hydrated Mg-silicates, such as chlorite, which has been recognized as an abundant mineral in the metavolcanics of the Lemaire Formation and metapelites and metagraywackes of the Yahgán Formation. Finally, the isotopic composition of the investigated samples is consistent with the infiltration from local snow melting at altitudes in the range of 610-770m asl. The comparison of our data with those collected in 1991 seems to suggest a possible progressive decline of the bulk thermal output in the near future. This possibility should be seriously considered before planning a potentially onerous exploitation of the resource. Presently, the only ways to exploit this geothermal resource by the population scattered in the area are the direct use of thermal waters and/or spa structures. © 2012 Blackwell Publishing Ltd. Fil:Tassone, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_14688115_v13_n1_p21_Capaccioni
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Argentina
Geochemistry of thermal fluids
Geothermal areas
Tectonics
Tierra del Fuego
alkali feldspar
bicarbonate
country rock
discharge
fluorine
geothermal energy
geothermometry
graywacke
infiltration
isotopic composition
metapelite
salinity
snowmelt
sodium
tectonics
thermal spring
thermal water
Argentina
Fagnano Lake
Isla Grande de Tierra del Fuego
Tierra del Fuego [(ARC) South America]
spellingShingle Argentina
Geochemistry of thermal fluids
Geothermal areas
Tectonics
Tierra del Fuego
alkali feldspar
bicarbonate
country rock
discharge
fluorine
geothermal energy
geothermometry
graywacke
infiltration
isotopic composition
metapelite
salinity
snowmelt
sodium
tectonics
thermal spring
thermal water
Argentina
Fagnano Lake
Isla Grande de Tierra del Fuego
Tierra del Fuego [(ARC) South America]
Capaccioni, B.
Menichetti, M.
Renzulli, A.
Tassone, A.
Huertas, A.D.
Thermal waters of 'tectonic origin': The alkaline, Na-HCO3 waters of the Rio Valdez geothermal area (Isla Grande de Tierra del Fuego, Argentina)
topic_facet Argentina
Geochemistry of thermal fluids
Geothermal areas
Tectonics
Tierra del Fuego
alkali feldspar
bicarbonate
country rock
discharge
fluorine
geothermal energy
geothermometry
graywacke
infiltration
isotopic composition
metapelite
salinity
snowmelt
sodium
tectonics
thermal spring
thermal water
Argentina
Fagnano Lake
Isla Grande de Tierra del Fuego
Tierra del Fuego [(ARC) South America]
description The 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 (≤1L/s) and temperatures in the range of 20-33°C distributed in an area of <1km2. The thermal springs are characterized by alkaline, Na-HCO3 waters with low salinity (0.53÷0.58g/L), but relatively high fluoride contents (up to 19.4mg/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 temperatures in the range of 100-150°C and an almost complete chemical equilibrium with the alkali-feldspars in the metavolcanic country rocks. The relatively high fluorine contents can be explained by the slow ascent and cooling of deep groundwaters followed by a progressive re-equilibration with F-bearing, hydrated Mg-silicates, such as chlorite, which has been recognized as an abundant mineral in the metavolcanics of the Lemaire Formation and metapelites and metagraywackes of the Yahgán Formation. Finally, the isotopic composition of the investigated samples is consistent with the infiltration from local snow melting at altitudes in the range of 610-770m asl. The comparison of our data with those collected in 1991 seems to suggest a possible progressive decline of the bulk thermal output in the near future. This possibility should be seriously considered before planning a potentially onerous exploitation of the resource. Presently, the only ways to exploit this geothermal resource by the population scattered in the area are the direct use of thermal waters and/or spa structures. © 2012 Blackwell Publishing Ltd.
format JOUR
author Capaccioni, B.
Menichetti, M.
Renzulli, A.
Tassone, A.
Huertas, A.D.
author_facet Capaccioni, B.
Menichetti, M.
Renzulli, A.
Tassone, A.
Huertas, A.D.
author_sort Capaccioni, B.
title Thermal waters of 'tectonic origin': The alkaline, Na-HCO3 waters of the Rio Valdez geothermal area (Isla Grande de Tierra del Fuego, Argentina)
title_short Thermal waters of 'tectonic origin': The alkaline, Na-HCO3 waters of the Rio Valdez geothermal area (Isla Grande de Tierra del Fuego, Argentina)
title_full Thermal waters of 'tectonic origin': The alkaline, Na-HCO3 waters of the Rio Valdez geothermal area (Isla Grande de Tierra del Fuego, Argentina)
title_fullStr Thermal waters of 'tectonic origin': The alkaline, Na-HCO3 waters of the Rio Valdez geothermal area (Isla Grande de Tierra del Fuego, Argentina)
title_full_unstemmed Thermal waters of 'tectonic origin': The alkaline, Na-HCO3 waters of the Rio Valdez geothermal area (Isla Grande de Tierra del Fuego, Argentina)
title_sort thermal waters of 'tectonic origin': the alkaline, na-hco3 waters of the rio valdez geothermal area (isla grande de tierra del fuego, argentina)
url http://hdl.handle.net/20.500.12110/paper_14688115_v13_n1_p21_Capaccioni
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AT menichettim thermalwatersoftectonicoriginthealkalinenahco3watersoftheriovaldezgeothermalareaislagrandedetierradelfuegoargentina
AT renzullia thermalwatersoftectonicoriginthealkalinenahco3watersoftheriovaldezgeothermalareaislagrandedetierradelfuegoargentina
AT tassonea thermalwatersoftectonicoriginthealkalinenahco3watersoftheriovaldezgeothermalareaislagrandedetierradelfuegoargentina
AT huertasad thermalwatersoftectonicoriginthealkalinenahco3watersoftheriovaldezgeothermalareaislagrandedetierradelfuegoargentina
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