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Published in: Sustainable Water Resources Management 4/2019

08-11-2017 | Original Article

Isotopes and geochemistry to assess shallow/thermal groundwater interaction in a karst/fissured-porous environment (Portugal): a review and reinterpretation

Authors: J. M. Marques, C. Matos, P. M. Carreira, M. O. Neves

Published in: Sustainable Water Resources Management | Issue 4/2019

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Abstract

As a distinctive fingerprint of the groundwater sources and water–rock interaction within a karst/fissured-porous environment, isotopic (e.g. δ13C, δ18O, δ34S, 3H, and 14C) and geochemical data have been used to establish flow paths (diffuse flow) of thermal waters used in Caldas da Rainha Spa (Portuguese mainland). These thermal waters (T ≈ 32 °C) discharge from springs and boreholes located close to an N–S-oriented oblique fault (60°E). This hydrothermal system is dominated by deep karst/fissured-porous Lower Jurassic carbonate formations containing slow flowing groundwater. 14C determinations in the total dissolved inorganic carbon (TDIC) indicate a mean “age” of about 1600 years BP for the thermal waters. The HCO3, Ca2+, and Mg2+ signatures are related to water/calcite–dolomite interaction, whereas Na+, Cl, and SO42− concentrations are mainly associated with halite and gypsum dissolution. δ18O values indicate that the hydrothermal aquifer system is depleted in heavy isotopes comparing to the shallow aquifer systems, signifying that the main recharge must be related to the Lower Jurassic carbonate formations of the Candeeiros Mountain. The δ13C values measured in the TDIC are typical of carbonate dissolution enhanced by CO2 soil air dissolution. The δ34Ssulphate and δ18Osulphate values of the thermal waters indicate that the sulphate is clearly the result of water–rock interaction with evaporitic layers at depth. Considering a mean geothermal gradient in the region of about 30 °C/km, the silica and K2/Mg geothermometry seems to indicate more reliable circulation depths (1–2 km) for the thermal waters than the SO42−–H2O isotope geothermometer (3–5 km depth). The lack of mixing evidences between the thermal and the local shallow cold groundwaters indicates that both water sources are distinct. Furthermore, increasing knowledge on the local/regional hydrogeology is extremely important to achieve the sustainable use of such “invisible” georesources, since most thermal and mineral waters from karst aquifers worldwide are used both as a source of bottled water and a recreational resource (spa facilities, tourism, etc.).

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Metadata
Title
Isotopes and geochemistry to assess shallow/thermal groundwater interaction in a karst/fissured-porous environment (Portugal): a review and reinterpretation
Authors
J. M. Marques
C. Matos
P. M. Carreira
M. O. Neves
Publication date
08-11-2017
Publisher
Springer International Publishing
Published in
Sustainable Water Resources Management / Issue 4/2019
Print ISSN: 2363-5037
Electronic ISSN: 2363-5045
DOI
https://doi.org/10.1007/s40899-017-0207-3

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