caracterisation Geochimique Et isotopique Des Eaux souterraines du palteau de mellagoa bouhmama. Khenchela-Algerie

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Abbes Laghrour University- Khenchela
The study area is a sedimentary basin filled with Quaternary deposit lying on fissured carbonate, calcareous and Marlo-calcareous formations; the marly substratum is of important thickness. The aquifer typology allows the distinction of two water tables, one is superficial contained in the Quaternary filling, and the other is deep within the fissured carbonate formations. Water that appears within the fissured carbonate formations has bicarbonatecalcium facies in the Mio-Plio-Quaternary; water evolves from sulfate-calcium facies into chloride-sodium water. The thermodynamic analysis has revealed water saturation with carbonates, calcite and dolomite, because of CO degassing and dissolution of the evaporitic formations, gypsum and halite. Water salinity develops progressively and increases in the flow direction, upstream from the calcareous outcrops, with a conductivity of 589µS/cm, to reach a peak of 6440µS/cm in the irrigated perimeters. The crossed binary diagrams suggest that the origin of water salinization would be attributing to water-rock interaction through the geochemical process of mineral dissolution-precipitation and ion exchange. The chemical tracing by trace elements and the heavy metals corroborate that the anthropogenic activity contributes, for its part, to increasing water mineralization. The isotopic study gives capital information about the origin of this water in this region. It is meteoric water.