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)

  • M. Morais
  • C. Recio
Part of the Environmental Earth Sciences book series (EESCI)


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‰).


Mineral Water Dissolve Inorganic Carbon Floridan Aquifer Incongruent Dissolution Natural Mineral Water 
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© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • M. Morais
    • 1
  • C. Recio
    • 1
  1. 1.Centre for Geophysics of the University of CoimbraCoimbraPortugal

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