The gypsum karst aquifer in the Ouled Fares area (Northern Algeria)
1993
Motyka, J. (University of Mining and Metallurgy, Krakow (Poland))
Detailed geological and hydrogeological mapping has been undertaken on about 50 km square of the environs of Ouled Fares (northern part of Cheliff valley). In the gypsum karst aquifer, three systems of ground water circulation have been identified: (1) near surface - related to karst cavities and caverns; (2) shallow - related to fissures and partially to matrix within gypsums and sandstones underlying them; (3) deep - connected with unrecognized deep basement. Water samples from 23 springs, 2 from underground stream and 1 from well have been analysed. However chemical composition of ground water is critically influenced by the mineralogy of rocks. All the three circulation systems are dominated by more or less salty waters (2-14 g per l). Increasing mineralization of ground water is accompanied by changes in the chemical composition from SO4Ca through multi-ion to ClNa.
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