Groundwater Evolution in the Multilayer Aquifers of the Mekelle Sedimentary Outlier (Northern Ethiopia): A Chemical and Isotopic Approach
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The study aims to evaluate groundwater geochemistry characterization of multilayer aquifers of the Sedimentary Rock in Mekelle Outlier in order to gain knowledge on the dominant geochemical processes and water quality status. Groundwater samples were collected and analyzed for major ion chemistry and stable isotopes (δ2H and δ18O). The findings reveal that the sources of ions into the groundwater are controlled by the duration of the water-rock interaction in confined and semi-confined aquifers. The chemical facies of the water evolve from Ca–HCO3 to Ca–SO4 along the flow direction. The stable isotope of δ2H versus δ18O signifies a source of local meteoric water. The isotopic signature of few samples depicts the effect of the evaporation process prior to infiltration.
KeywordsGeochemical processes Groundwater Mekelle Sedimentary rocks Stable isotopes
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