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    Identification of Recharge Processes in Groundwater in Hard Rock Aquifers of Madurai District Using Stable Isotopes

    Access Status
    Fulltext not available
    Authors
    Thivya, C.
    Chidambaram, S.
    Rao, M.
    Gopalakrishnan, M.
    Thilagavathi, R.
    Prasanna, Mohan Viswanathan
    Nepolian, M.
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Thivya, C. and Chidambaram, S. and Rao, M. and Gopalakrishnan, M. and Thilagavathi, R. and Prasanna, M.V. and Nepolian, M. 2016. Identification of Recharge Processes in Groundwater in Hard Rock Aquifers of Madurai District Using Stable Isotopes. Environmental Processes. 3 (2): pp. 463-477.
    Source Title
    Environmental Processes
    DOI
    10.1007/s40710-016-0137-3
    ISSN
    2198-7491
    School
    Curtin Sarawak
    URI
    http://hdl.handle.net/20.500.11937/50223
    Collection
    • Curtin Research Publications
    Abstract

    Stable isotopes of H and O are the integral parts of water molecule and serve as ideal tracers to understand the recharge processes in groundwater. Hence, a study has been conducted in hard rock aquifers of Madurai District of Tamilnadu to identify the recharge processes using stable isotopes. A total of 54 groundwater samples were collected representing the entire district from various lithounits during post monsoon. Samples were analysed for pH, EC, Ca2+, Mg2+, Na+, K+, Cl− HCO3−, SO42−, PO43−, H4SiO4, F−, δ18O and δD. Cl− and HCO3− were the dominant ions in groundwater samples. Average values of Cl− and HCO3− ranged from 247 and 244 mg/L in fissile hornblende biotite gneiss, 262 and 268 mg/L in Charnockite, 75 and 185 mg/L in quartzite, 323 and 305 mg/L in granite, 524 and 253 mg/L in floodplain alluvium rock types. Geochemical signatures of groundwater were used to identify the chemical processes that control hydrogeochemistry. Interpretation of δ18O and δD indicates recharge from the meteoric water in charnockite, quartzite, granite and some samples of fissile hornblende biotite gneiss. It is also inferred that recharge take place from evaporated water in floodplain alluvium and fissile hornblende biotite gneiss.

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