Hydrochemical Characteristics of Thermal Water Reservoir in Lądek-Zdrój in Light of Research into the Borehole LZT-1—The Deepest Borehole in the Sudetes (SW Poland)

Barbara Kiełczawa, Wojciech Ciężkowski, Mirosław Wąsik and Marek Rasała
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Barbara Kiełczawa: Department of Mining, Faculty of Geoengineering, Mining and Geology, Wroclaw University of Science and Technology, 50-370 Wrocław, Poland
Wojciech Ciężkowski: Department of Mining, Faculty of Geoengineering, Mining and Geology, Wroclaw University of Science and Technology, 50-370 Wrocław, Poland
Mirosław Wąsik: Institute of Geological Science, Faculty of Earth Science and Environmental Management, Wroclaw University, 50-137 Wrocław, Poland
Marek Rasała: Institute of Geology, Faculty of Geographic and Geological Science, Adam Mickiewicz University, 61-712 Poznań, Poland

Energies, 2021, vol. 14, issue 4, 1-20

Abstract: Lądek-Zdrój is situated within the tectonic unit of the Lądek-Śnieżnik metamorphic complex. Thermal water is captured by five springs and borehole L-2. These waters are characterized by TDS content in the range of 160–230 mg/L and predominance of HCO 3 − (15–100% meq), SO 4 2+ (10–36% meq), and Na + (57–91% meq) ions. Increased concentrations of radon, hydrogen sulfide, and fluoride ions (7–13 mg/L) determine the medicinal properties of these waters, classified as thermal waters of Na-HCO 3 -(SO 4 ), F − , H 2 S, Rn type, with temperatures of 18 to 30 °C and 41 to 45 °C in springs and in the L-2 borehole, respectively. At the turn of 2018 and 2019, a new borehole LZT-1 was drilled in the area of Lądek-Zdrój. It captured thermal waters with a temperature of 37.4 °C at the outflow. The water temperature at the bottom of the heated borehole reached about 59 °C. The lithology of rocks found in the recharged areas implied that the Ca 2+ ions present in the studied waters originated from pyroxenes, amphiboles, calcite, calcium plagioclases, and fluorite. As for Na + and K + ions, they originate from sodium plagioclases, microcline, and orthoclase. The probable deposit temperature of waters from this borehole was estimated with the use of chemical geothermometers, as ranging from about 87 °C to 97 °C.

Keywords: geothermal water; medicinal water; hydrochemistry; geothermometers; crystalline massif; Lądek-Zdrój; Poland (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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