Abstract
The conceptual model of Cabeço de Vide mineral waters, issuing at the contact metamorphism zone developed by the local mafic/ultramafic pluton, is described. These mineral waters discharge with a temperature between 17 and 20°C, show a very alkaline pH (up to 11.8), and have: Na-Cl/Ca-OH facies; dry residuum ≈ 200mg/L; Ctotal < 3.0mg/L; and extremely low Mg2+ and silica concentrations (< 0.3 and 6.5mg/L, respectively). CH4 isotopic composition (-24.4 o/oo < δ13C-CH4 < -14.0 o/oo and -285 o/oo < δ2H-CH4 < -218 o/oo) falls in the range of typical abiotic gas. In the case of Cabeço de Vide mineral waters, the understanding of the resource will help to preserve the mineral water quality, creating public interest.
Published Version
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