Details

Autor(en) / Beteiligte

• Thivya, C.
• Chidambaram, S.
• Rao, M. S.
• Gopalakrishnan, M.
• Thilagavathi, R.
• Prasanna, M. V.
• Nepolian, M.

Titel

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

Ist Teil von

• Environmental processes, 2016-06, Vol.3 (2), p.463-477

Ort / Verlag

Cham: Springer International Publishing

Erscheinungsjahr

2016

Link zum Volltext

Quelle

SpringerLink (Online service)

Beschreibungen/Notizen

• 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, Ca 2+ , Mg 2+ , Na + , K + , Cl − HCO 3 − , SO 4 2− , PO 4 3− , H 4 SiO 4 , F − , δ 18 O and δD. Cl − and HCO 3 − were the dominant ions in groundwater samples. Average values of Cl − and HCO 3 − 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 δ 18 O 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.