Resumen: The reservoir temperature of the waters in the low temperature carbonate-evaporitic geothermal system of Arnedillo has been estimated by using two different techniques: 1) chemical geothermometers and 2) geothermometrical modelling. By combining the results of both techniques a reliable range of temperature of 90 ± 20 oC has been proposed for the waters in the reservoir. Despite being a carbonate-evaporitic system, the cationic geothermometers have provided good results, which, together with the geothermometrical modelling, indicate that the waters have reached equilibrium with anhydrite, quartz, calcite, dolomite, albite and K-feldspar in the reservoir. Idioma: Inglés DOI: 10.1016/j.proeps.2016.12.034 Año: 2017 Publicado en: Procedia Earth and Planetary Sciences 17 (2017), 65-68 ISSN: 1878-5220 Financiación: info:eu-repo/grantAgreement/ES/MEC/FPU14-01523 Tipo y forma: Article (Published version) Área (Departamento): Área Petrología y Geoquímica (Dpto. Ciencias de la Tierra)