干旱区生态环境知识资源中心

The determination of the origin of salinity and mineralization of groundwater from the Plio-Quaternary aquifer of Essaouira Basin was the main goal of this research, investigated by the combined study of chemical (particularly Br and Cl) and isotopic (O-18 and H-2) compositions. The study of Br / Cl ratio vs Cl showed that mineralized waters of the shallow aquifer in the Essaouira Basin is the result of: (i) the marine influence (precipitation and aerosols directly from the ocean), (ii) dissolution of evaporite minerals (halite), (iii) seawater intrusion and iv) ion exchange mechanisms. The O-18-H-2 diagram showed that the groundwater recharge is maintained by direct precipitation without evaporation and runoff. The Cl/O-18 ratio showed the existence of a mixture trend of seawater-groundwater. (C) 2017 The authors. Published by Elsevier B.V.