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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)

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‰).

Keywords

Mineral Water Dissolve Inorganic Carbon Floridan Aquifer Incongruent Dissolution Natural Mineral Water 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© 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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