A geochemical and geophysical approach to derive a conceptual circulation model of CO2-rich mineral waters: A case study of Vilarelho da Raia, northern Portugal |
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| Authors: | J Marques Monteiro F Santos R Graça R Castro L Aires-Barros L Mendes Victor |
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| Institution: | (1) Instituto Superior Técnico, Laboratório de Mineralogia e Petrologia. Universidade Técnica de Lisboa. Av. Rovisco Pais, 1049-001 Lisboa, Portugal,;(2) Departamento de Física and Centro de Geofísica da Universidade de Lisboa. Campo Grande, Edifício C8, Piso 6, 1749-016 Lisboa, Portugal, |
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| Abstract: | The Vilarelho da Raia-Chaves region, located in northern Portugal adjacent to the Spanish border, is characterized by both
hot and cold CO2-rich mineral waters issuing from springs and drilled wells. The present paper updates the conceptual circulation model of
the Vilarelho da Raia cold CO2-rich mineral waters. Vilarelho da Raia mineral waters, dominated by Na and HCO3 ions, have formed mainly by interaction with CO2 of deep-seated mantle origin. The δ
18O, δ
2H and 3H values indicate that these waters are the result of meteoric waters infiltrating into Larouco Mountain, NW of Vilarelho
da Raia, circulating at shallow depths in granitic rocks and moving into Vilarelho da Raia area. The conceptual geochemical
and geophysical circulation model indicates that the hot and cold CO2-rich mineral waters of Chaves (76 °C) and Vilarelho da Raia (17 °C) should be considered manifestations of similar but not
the same geohydrological systems.
Electronic Publication |
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| Keywords: | CO2-rich mineral waters geophysics hydrochemistry Portugal stable isotopes |
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