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Hydrogeochemical and geophysical research of thermal springs area in Topusko, Croatia

Over the past fifty years, thermal waters with temperatures of up to 65 °C have served as the basis for heating, health and recreational tourism in Topusko town. Natural thermal springs with temperatures of up to 53°C, which emerge in the discharge area of the Topusko hydrothermal system, are located at the junction of two major tectonic units: the SW margin of the Pannonian Basin System and the Dinarides. Initial research data were very scarce, so the presented results comprise the most recent findings gathered in the scope of the HyTheC research project. Hydrochemical and geothermometric research of thermal waters was done together with the application of geophysical investigations to improve the existing conceptual model of the Topusko hydrothermal system. The two main objectives of the presented work are the hydrogeochemical characterisation of the naturally emerging thermal waters and the identification of a fault damage zone in the spring area by electrical resistivity tomography. The hydrogeochemical facies Ca-HCO3 of thermal water was determined, the equilibrium reservoir temperature was estimated to be 88 °C using a SiO2-quartz geothermometer, and the assumed fault damage zones were identified for the first time in the discharge area of thermal springs.

hydrothermal system, hydrogeochemical characteristics, electrical resistivity tomography, thermal spring, Topusko

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