Control on the Occurrences Thermal Springs at Southeastern Area of Singkarak Lake, West Sumatra, Indonesia: Preliminary Study Results

Abstract

Several thermal springs are discharging at the southeastern area of Singkarak Lake, West Sumatra. Indonesia. Two springs with temperature in range of 44 – 69 deg.C discharging in association with extensive outcrop of fossil travertine (up to 9000 m3). Lineament of travertine outcrops strike in NNE-SSW, which is possibly the extensional fracture component of Sumani Fault striking NW-SE. Permian limestone at the western of Singkarak Lake might be dissolved by magmatic thermal water depositing calcium-carbonate mineral on the surface. The deep-seated fault of Sumatran Fault System possibly act as the heat transfer media and controlling the thermal regime at the peripheral of Singkarak Lake rather than volcanic control. The preliminary finding results would add the insight of geothermal exploration strategies in Singkarak in relating to permeability mapping.