Groundwater�s studies at middle Kert aquifer in northeast of Morocco are very important due to the\r\nsemi-arid character and its geological history. The region is recognized by messinian salinity crisis\r\nalready 5.6 Ma. Water chemistry is mainly dominated by dissolution of evaporate rocks (Halite and\r\nGypsum) related to outcropping and basement limits developed in Messinian age. Freshwater with total\r\ndissolved solids 740 mg/l (average value) in Tafersite district is chemically distinct from saline water\r\nwith total dissolved solids of 9803 mg/l in the south zone. In wadis, water is S04-Cl-Ca type; they are\r\ninfluenced by the surrounding highlands located at the south of the plain. The investigation reveals that\r\nweathering of evaporated rocks is the processes responsible for high Na+, Ca2+, Mg2+, Cl- and SO4\r\n2-\r\nconcentrations. Also, hydro chemical data displays that freshwater observed in the northwest part\r\nreflect the influence of freshwaters coming from metamorphic massive of Temsamane. The factorial\r\nanalysis reveal three sources of salinization, the principal one is described above, whilst the\r\ndissolution of carbonates and human influence represented by NO3\r\n-, played only a secondary role.
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