Abstract
The paper describes isotope studies carried out in Tattapani, Puga and Manikaran geothermal areas in India. Tattapani geothermal area: δD, δ18O and 3H measurements of thermal and non-thermal waters of Tattapani area showed that hot waters are normal meoteoric waters and show negligible δ18O shift due to water rock interaction. Some mixing of the hot water with local cold water in the shallow zone is possible. Puga geothermal area: The hot springs and hot borehole waters show a maximum δ18O shift of about 2‰. The recharge area of the hot springs was found to be about 5600 m above mean sea level. Manikaran geothermal area: Isotope tracer studies carried out using 82Br and 3H showed that the geothermal waters appear to be mainly flowing from north to south across the Parvati valley. The velocity of flow of the thermal waters from DGW-1 to MGW-IV boreholes was of the order of 70 m/d.
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