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Preliminary Studies of a Karst Warm Spring in Mt. Kr?uterin, Austria

by Dachang Zhang,
Rudolf Pavuza,
Hans Fischer,
Karl Mais,



Document Type: Proceeding Paper

Part of: North American Water and Environment Congress & Destructive Water

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 ?D and ?¹⁸O 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: Hydration | Sulfates | Thermal power | Temperature effects | Thermal effects | Reservoirs | Karst | Austria | Europe

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