Abstract
The groundwater chemistry and stable isotopic composition of aqueous C- and S-bearing species were determined for mineral waters from Monte Real and Curia Spas. The results support dedolomitization -dolomite dissolution occurs as the gypsum dissolves and calcite precipitates- as a principal geochemical process controlling Ca - SO4 facies of these waters. Soil CO2 of atmospheric origin and carbonate weathering are the primary sources of dissolved inorganic carbon (DIC). However, dissolution / precipitation of carbonates, through incongruent dissolution of dolomite, is the controlling factor for the evolution of the C isotopic composition of DIC, as shown by δ13C values of -11.8‰ (Monte Real) and -9.4‰ (Curia). When present, the dissolved sulphide species (δ34SH2S= -36.1‰ for Monte Real) appears to be derived from biogenic reduction of dissolved sulphate (δ34SSO4 = +16.1‰ for Monte Real and +14.8‰ at Curia), itself derived from dissolution of Hettangian evaporites gypsum (δ34SGy = +14.4‰).
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Morais, M., Recio, C. (2011). Geochemical and isotopic controls of carbon and sulphur in calciumsulphate waters of the western Meso-Cenozoic Portuguese border (natural mineral waters of Curia and Monte Real). In: Lambrakis, N., Stournaras, G., Katsanou, K. (eds) Advances in the Research of Aquatic Environment. Environmental Earth Sciences. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-24076-8_15
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DOI: https://doi.org/10.1007/978-3-642-24076-8_15
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