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dc.contributor.author
Capaccioni, Bruno
dc.contributor.author
Menichetti, Marco
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dc.contributor.author
Renzulli, Alberto
dc.contributor.author
Tassone, Alejandro Alberto
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dc.contributor.author
Huertas, Antonio D.
dc.date.available
2019-07-19T19:09:25Z
dc.date.issued
2013-02
dc.identifier.citation
Capaccioni, Bruno; Menichetti, Marco; Renzulli, Alberto; Tassone, Alejandro Alberto; Huertas, Antonio D.; Thermal waters of "tectonic origin": The alkaline, Na-HCO3 waters of the Rio Valdez geothermal area (Isla Grande de Tierra del Fuego, Argentina); Wiley Blackwell Publishing, Inc; Geofluids; 13; 1; 2-2013; 21-31
dc.identifier.issn
1468-8115
dc.identifier.uri
http://hdl.handle.net/11336/79928
dc.description.abstract
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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Wiley Blackwell Publishing, Inc
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Argentina
dc.subject
Geochemistry of Thermal Fluids
dc.subject
Geothermal Areas
dc.subject
Tectonics
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Tierra del Fuego
dc.subject.classification
Geoquímica y Geofísica
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Thermal waters of "tectonic origin": The alkaline, Na-HCO3 waters of the Rio Valdez geothermal area (Isla Grande de Tierra del Fuego, Argentina)
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-06-03T19:17:48Z
dc.journal.volume
13
dc.journal.number
1
dc.journal.pagination
21-31
dc.journal.pais
Reino Unido
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dc.journal.ciudad
Londres
dc.description.fil
Fil: Capaccioni, Bruno. Universidad de Bologna; Italia
dc.description.fil
Fil: Menichetti, Marco. Università Di Urbino “Carlo Bó”; Italia
dc.description.fil
Fil: Renzulli, Alberto. Università Di Urbino “Carlo Bó”; Italia
dc.description.fil
Fil: Tassone, Alejandro Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina
dc.description.fil
Fil: Huertas, Antonio D.. Instituto Andaluz de Ciencias de la Tierra; España
dc.journal.title
Geofluids
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1111/gfl.12005
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/full/10.1111/gfl.12005
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