Abstract
The overexploitation of the Alto Guadalentı́n detrital aquifer has led to an unusually high gas content in the waters, which is released as the hydrostatic charge decreases. The predominant gas proved to be CO 2. Isotopic studies show that δ 18 O values are in the range −8.8 to −6.5‰ SMOW, δD ranges between −45 and −40‰ SMOW, excess deuterium lies between +8.0 and +27.4, and δ 13 C values lie between −8.1 and −3.8‰ PDB. This reveals that there is an enrichment in 18 O as well as mixing processes between meteoric and deep circulating waters. Tectonic and seismotectonic studies indicate crustal thinning in the studied region and numerous normal, reverse and strike-slip faults marked by positive thermal anomalies. There is also evidence of present day tectonic activity.
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