000087541 001__ 87541 000087541 005__ 20230111103822.0 000087541 0247_ $$2doi$$a10.1016/j.jhydrol.2019.01.013 000087541 0248_ $$2sideral$$a110896 000087541 037__ $$aART-2019-110896 000087541 041__ $$aeng 000087541 100__ $$0(orcid)0000-0002-7383-9988$$aBlasco, M.$$uUniversidad de Zaragoza 000087541 245__ $$aGeochemical evolution of thermal waters in carbonate – evaporitic systems: The triggering effect of halite dissolution in the dedolomitisation and albitisation processes 000087541 260__ $$c2019 000087541 5060_ $$aAccess copy available to the general public$$fUnrestricted 000087541 5203_ $$aThe Fitero and Arnedillo geothermal systems are located in the NW part of the Iberian Range (Northern Spain). The geothermal reservoir is hosted in the Lower Jurassic carbonates, in contact with the evaporitic Keuper Facies. Thermal waters are of chloride-sodium type with discharge temperature of about 45 °C and near neutral pH. The Arnedillo waters are more saline with higher Na, Cl and sulphate contents, but lower Ca and Mg than the Fitero waters. All waters have attained mineral equilibrium at depth with calcite, dolomite, anhydrite, quartz, albite, K-feldspar and other aluminosilicates, except for the Fitero waters, which have not reached the equilibrium with the aluminosilicates. The calculated reservoir temperature is 81 ± 11 °C in Fitero and 87 ± 13 °C in Arnedillo. In order to identify the reasons for the differences found between the two systems some inverse and forward geochemical calculations were performed and the main water-rock interaction processes responsible for the chemical evolution of these waters have been evaluated. Halite dissolution has been found to be the triggering factor for the two most important geochemical processes in the system: a) albitisation process, due to the common ion effect (Na); and b) dedolomitisation process, associated with the salinity increase, which enhance the dissolution of anhydrite and, in turn, produces the precipitation of calcite (common ion effect, Ca) and the concomitant dissolution of dolomite. Halite dissolution may be an important driving force in the geochemical evolution of groundwater systems in contact with carbonates and evaporites, where equilibrium with K-feldspar, albite and anhydrite has already been attained. The evolution of the processes at pH, temperature and salinity ranges wider than those in the Fitero-Arnedillo system has been theoretically examined with additional reaction-path simulations, in order to generalise the geochemical behaviour of these processes in other environments. 000087541 536__ $$9info:eu-repo/grantAgreement/ES/DGA-UZ/Geochemical Modelling Group$$9info:eu-repo/grantAgreement/ES/MCIU/FPU14-01523 000087541 540__ $$9info:eu-repo/semantics/openAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/ 000087541 590__ $$a4.5$$b2019 000087541 592__ $$a1.684$$b2019 000087541 591__ $$aENGINEERING, CIVIL$$b9 / 134 = 0.067$$c2019$$dQ1$$eT1 000087541 593__ $$aWater Science and Technology$$c2019$$dQ1 000087541 591__ $$aWATER RESOURCES$$b6 / 94 = 0.064$$c2019$$dQ1$$eT1 000087541 591__ $$aGEOSCIENCES, MULTIDISCIPLINARY$$b15 / 198 = 0.076$$c2019$$dQ1$$eT1 000087541 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion 000087541 700__ $$0(orcid)0000-0003-1463-1682$$aAuqué, L.F.$$uUniversidad de Zaragoza 000087541 700__ $$0(orcid)0000-0001-5645-9150$$aGimeno, M.J.$$uUniversidad de Zaragoza 000087541 7102_ $$12000$$2685$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Petrología y Geoquímica 000087541 773__ $$g570 (2019), 623-636$$pJ. hydrol.$$tJournal of Hydrology$$x0022-1694 000087541 8564_ $$s1067817$$uhttps://zaguan.unizar.es/record/87541/files/texto_completo.pdf$$yPostprint 000087541 8564_ $$s202180$$uhttps://zaguan.unizar.es/record/87541/files/texto_completo.jpg?subformat=icon$$xicon$$yPostprint 000087541 909CO $$ooai:zaguan.unizar.es:87541$$particulos$$pdriver 000087541 951__ $$a2023-01-11-10:05:47 000087541 980__ $$aARTICLE