Areas of fresh and brackish groundwaters have been delineated in an area underlain by granulitic rocks using electrical resistivity method. A sharp boundary between fresh and brackish waters has been identified on one side of the area. Sedimentological studies have indicated that the area having brackish to saline groundwaters of chloride-/sulphate type is covered by clays of marine origin. A hydrogeological boundary with limited permeability has been identified, which seems to help the fresh water area from getting contaminated by the saline waters. The study shows that the saline groundwaters may be the result of marine environment that may have existed in the area during the geological past. It is observed that the aquifer resistivity pattern of the area compares well with the electrical conductivity pattern of the groundwater.

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