Preliminary Studies of a Karst Warm Spring in Mt. Kräuterin, Austriaby Dachang Zhang,
Abstract: A warm spring occurs at the west foot of Mt. Kruterin, characterized by relatively higher temperature (17.4°C) and sulfate concentration (162 mg/L) against with the regional background level (4∼8°C, [(SO4)2-] = 14.9 mg/L). An origin from direct infiltration of local precipitation water is concluded from the δD and δ18O values (-81.2 ߮ and -11.29 ߮ respectively) and the tritium concentration (3.4 TU). SiO2 geothermometer indicates the temperature of the geothermal reservoir is 108°C and quartz might be the mineral playing the role of equilibrium. The normal water is locally recharged with a mean filtration depth of 74 m. The good linear correlation between water temperature and the sulfate concentration evidences a simply mixing of the normal shallow water with the warm, high-sulfate-content water. According to geological setting, Permian Gypsum can be at the thermal reservoir. The mixture ratio between old thermal water and young normal water is 10:90. Calculation of 14C dilution by carbonate dissolution gives an age range of 6973±1382 years to the warm water component. However, this age might be overestimated due to the sulfate reduction mediated by bacterial action.
Subject Headings: Water management | Karst | Sulfates | Temperature effects | Reservoirs | Thermal effects | Infiltration | Thermal power | Precipitation | Europe | Austria
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