Evolución geoquímica de las aguas subterráneas en una cuenca sedimentaria semiáridaacuífero de Baza-Caniles, Granada, España

Zusammenfassung

The physico-chemical data from the analysis of water from the Baza-Caniles detritic aquifer(Province of Granada,Spain), was used to asses the quality of the groundwater resources, and to determine the main geochemical process which are taking place in the aquifer system. An incongruent dolomite dissolution was identified in the unconfined sectors of the mio-pliocene detritic aquifer a rise in CO2 content in the water can be observed, which encourages carbonate dissolution. The bicorbanate-sulfate character of the water in the confined shallow sectors of the mio-pliocene aquifer is interpreted as a result of calcite precipitation, accompanied in certain areas by halite dissolution in a slightly reducing medium. A confined reduction zone linked to the deep sector of the aquifer, under evaporite impermeable materials, can be identified from analytical data. The geochemical characteristics of this brackish water are the result of the halite and sulphate dissolution and redox process.