A third group of springs, far from the northeastern boundary of the permeable outcrops, shows higher SO42- content than the rest (≈125 mg/l). The substantial difference in the amount of dissolved SO42- between the springs located in its northwestern part (≈25 mg/l) and those elsewhere in the northern part (≈60 mg/l) suggests zones with separate groundwater flow systems. dissolution of evaporites, atmospheric deposition, etc.). We sampled the main springs, as well as other minor outlets related to perched water tables, in order to determine the different sources of SO42- (e.g. In this study, stable isotopes of dissolved sulfate (δ34S and δ18O) and groundwater chemistry were used to determine the origin of the sulfate and to characterize the groundwater flow. The main groundwater discharge is produced at its northern boundary through several high-flow springs. The Sierra Gorda aquifer is one of the most extensive of southern Spain.
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