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< Ca2+2+ > K+ > Fe2+ while the anions reveal order of abundance as Cl > HCO3 > SO42 > NO3 . The geographical information system \(GIS\) using Inverse Distance Weighted \(IDW\) delineate two groundwater zones into: Ca-Mg-SO4-Cl and Na-SO4-Cl water types. The Ca-Mg-SO4-Cl constitutes about 35% of the chemical facies and its evolutionary trend is due to simple hydrochemical mixing between Ca-Mg-HCO3 and Na-SO4-Cl facies and reverse cation exchange. The Na-SO4-Cl facies constitutes about 65% of the chemical facies and represents fossil groundwater. The Ca-Mg-SO4-Cl facies is dominant in the recharge areas while Na-SO4-Cl facies prevails in discharge areas. Rock-water interaction diagrams indicate precipitation induced chemical weathering along with dissolution of rock-forming minerals. The scattered plots among ions revealed geochemical processes as carbonate weathering, silicate weathering, cation exchange and sulphate reduction. HCA identified effects of rock-water interaction and anthropogenic effects as responsible for the modification of groundwater chemistry in the area.)/ModDate(D:20131224173806+08'00')/SourceModified(D:20131007022633)/Author(Ahmed Nur, Jackson M. Ishaku, Solomon N. Yusuf)/CreationDate(D:20131007102638+08'00')>>
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