German jako wskaźnik warunków hydrogeochemicznych w jeleniogórskim systemie geotermalnym

Geochemical studies on trace elements in thermal waters from Cieplice, Karpniki and Staniszów (Jelenia Góra Geother-mal System, Sudetes, Poland) revealed a presumably regional relation between germanium and silicon. The Ge : Si ratios in waters of Cieplice are likely controlled by the chemical equilibrium process of silicate minerals transformation in granite aquifer-rocks. Geo-chemical inverse mass balance modelling using main rock-forming minerals of actual composition shows that incongruent dissolution of primary silicate minerals with forming secondary (clay minerals, silica forms) phases is responsible for thermal water chemistry in Cieplice. Available data on germanium in silicate minerals combined with the results of geochemical modelling give Ge : Si ratios close to real values. A chemical non-equilibrium, and a gradual decrease of both the germanium content and the Ge:Si ratio have been iden-tified in the thermal waters from two new intakes (Karpniki, Staniszów).