Chlorine Geochemical and Isotopic (37Cl/35Cl) Signatures of CO2-Rich Mineral Waters (N-Portugal): Revisited

  • José Manuel MarquesEmail author
  • Hans Eggenkamp
  • Paula M. Carreira
  • Manuel Antunes da Silva
Conference paper
Part of the Advances in Science, Technology & Innovation book series (ASTI)


The CO2-rich mineral waters from Vilarelho da Raia, Chaves, Vidago and Pedras Salgadas region (N-Portugal) were analyzed for 37Cl/35Cl, Cl and other major elements. Local rain and shallow cold dilute waters were also studied. The main objective of this study was to use Cl geochemical signatures together with Cl isotope geochemistry to improve our knowledge on the origin of Cl in the hot (≈76 °C) and cold (≈16 °C) Na-HCO3-CO2-rich mineral waters that discharge in the region. Chlorine, a good tracer of water-rock interaction, presents a strong correlation with sodium (dominant cation) indicating that Cl present in the mineral waters originates from water-granitic rock interaction. δ37Cl isotope signatures indicate that i) 37Cl/35Cl in the studied mineral waters can also be explained by water-granitic rock interaction and ii) the contribution of a deep-seated (upper-mantle) Cl component should not be excluded.


Geochemistry Isotopes Sources of Cl CO2-rich mineral waters N-Portugal 



This work was funded by the PRAXIS Project “FLUMIRE” under the Contract No. C/CTE/11004/98. CERENA/IST acknowledges the FCT (the Portuguese Science and Technology Foundation) support through the UID/ECI/04028/2013 Project and C2TN/IST author gratefully acknowledge the FCT support through the UID/Multi/04349/2013 Project.


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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • José Manuel Marques
    • 1
    Email author
  • Hans Eggenkamp
    • 2
  • Paula M. Carreira
    • 3
  • Manuel Antunes da Silva
    • 4
  1. 1.Centro de Recursos Naturais e AmbienteInstituto Superior Tecnico (CERENA/IST), Universidade de LisboaLisbonPortugal
  2. 2.FB Geowissenschaften, Mathematisch-Naturwissenschaftliche FakultätUniversität TübingenTübingenGermany
  3. 3.Centro de Ciências e Tecnologias NuclearesInstituto Superior Técnico (C2TN/IST), Universidade de LisboaBobadela LRSPortugal
  4. 4.Super Bock GroupS. Mamede de InfestaPortugal

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