HYDROGEOCHEMICAL CHARACTERISATION OF A SEDIMENTARY TERRAIN IN AND AROUND BHUVANAGIRI, CHIDAMBARAM TALUK, SOUTHERN, INDIAC. DUSHIYANTHAN, T. JEYAVEL RAJA KUMAR, K. KARTHIKEYAN, D. DAVIDRAJU, B. THIRUNEELAKANDAN AND K. MANOHARAN
Major ionic chemistry of groundwater was studied in and around Bhuvanagiri town to understand the ionic source and its suitability for irrigation. Geologically the area consist of crystalline rocks of Archaean age, older sedimentary rocks of the Cretaceous age and younger sedimentaries of the Mio-Pliocene age. 20 bore well samples were collected at different locations and the analyses were carried out for the major cations and anions. The data were analysed using software WATCLAST and interpreted with Piper and Gibbs diagrams. The range of chemical concentration of cations such as Ca2+, Mg2+, Na+, K+ and anions like HCO3 , Cl, SO4 2 are 12.0 to 64.0 mg/L, 14.4 to 67.2 mg/ L, 21.0 to 1103.0 mg/L, 0.1 to 2.0 mg/L and 189.10 to 585.60 mg/L, 62.9 to397.60 mg/L, 6.5 to 21.0 mg/ L respectively. The result shows that most of the sample locations are not exceeding the maximum permissible limit of WHO standard. The data interpreted with Piper Trilinear diagram and Gibbs diagrams to understand the facies and source. The geochemical facies is Ca>Na and Cl>SO4>HCO3. Host rock contribution is the main source for ionic concentration of the groundwater. The hydrogeochemical attributes not detrimental to soil and agriculture activities of the study area.
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