Geochemical evolution of Groundwater in the Quaternary aquifer of the Berrechid Basin, Morocco El Ghali T.*, Marah H.*, Qurtobi M.*, Raibi F.*, El Mansouri B.** *National Center for Energy Sciences and Nuclear Techniques, Morocco **Faculty of Science, Ibn Tofail University, Kénitra, Morocco Online published on 18 September, 2018. Abstract A geochemical mass-transfer model (NETPATH) is used to construct geochemical reaction models of major processes affecting the chemical evolution of groundwater along one flowpath in part of the Berrechid aquifer, central part of Morocco. The mineralization increases gradually from the upstream in the south to the center of the plain demonstrating a mixing recharge and then decrease further to downstream in the north. The groundwater system was treated as open to carbon dioxide gas from oxidation of organic matter and external sources. The simulations demonstrate that dedolomitization (dolomite dissolution and calcite precipitation driven by gypsum dissolution), dissolution of halite and cation exchange strongly be in charge of the spatial distribution of groundwater quality along flowpath, and are highly developed in the central part of the basin. On the other hand, and further to downstream, CO2 gas was consumed and the previous reactions are fully reversed for calcite dissolution and precipitation of gypsum and dolomite, indicating probably, low water flow and differences in recharge water composition in this zone. Top Keywords Geochemistry, Modelling, Simulation, NETPATH, Mass balance, Aquifer. Top |