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Proceedings of the International Association of Hydrological Sciences An open-access publication for refereed proceedings in hydrology

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Proc. IAHS, 364, 475-480, 2014
https://doi.org/10.5194/piahs-364-475-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
 
16 Sep 2014
Hydrogeochemical characterization of a shallow groundwater system in the weathered basement aquifer of Ilesha area, southwestern Nigeria
M. N. Tijani1, S. A. Oke2, and A. T. Olowookere1 1Department of Geology, University of Ibadan, Ibadan, Nigeria
2Department of Chemical and Geological Sciences, Al-Hikmah University, Ilorin, Nigeria
Keywords: Groundwater, crystalline basement, weathered aquifer, hydrochemical characterization, water quality Abstract. Hydrogeochemical characterization of a weathered basement aquifer in Ilesha area, southwest Nigeria, was carried out with respect to geogenic and anthropogenic influences on the shallow groundwater system. Physico-chemical parameters revealed a pH of 6.4–8.4 and EC of 22–825 μs/cm in the urban areas compared to a pH of 7.3–10.5 and relatively higher EC of 126–1027 μs/cm in the peri-urban area. The concentrations of major cations (Ca, Na, K, Mg) in the urban areas revealed relatively lower average concentrations of 28.4, 16.7, 8.4 and 5.0 mg/L, respectively, compared to 82.5, 33.4, 19.3 and 12.4 mg/L, respectively, for the peri-urban areas. The low concentrations of major cations in the urban areas can be attributed to low mineral dissolution of quartzite and muscovite quartz-schist bedrocks compared to the weathered granitic, amphibolite and biotite schist in the peri-urban areas. Hydrochemical characterization revealed two main water types; namely Ca-Mg-(Na)-HCO3 mostly in the urban areas suggesting CO2-charged infiltrating recharge rainwater, and Ca-Na-(K)-SO4-Cl type in the peri-urban areas as products of water–rock interactions.

Citation: Tijani, M. N., Oke, S. A., and Olowookere, A. T.: Hydrogeochemical characterization of a shallow groundwater system in the weathered basement aquifer of Ilesha area, southwestern Nigeria, Proc. IAHS, 364, 475-480, https://doi.org/10.5194/piahs-364-475-2014, 2014.
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