Characterization of groundwater circulations in a headwater catchment from an analysis of chemical concentrations, Sr-Nd-U isotope ratios, and CFC, SF6 gas tracers (Strengbach CZO, France)

In order to characterize the chemical composition and age of water circulating in critical zone Strengbach catchment (Vosges mountains, France), samples from springs, 10–15 m deep piezometers 50–120 boreholes were collected analyzed elementary concentrations, Sr, Nd, U isotopic ratios, chlorofluorocarbon (CFC) sulfur hexafluoride (SF6) concentrations. The results evidence a clear distinction between surface ( 50 years) These confirm histories catchment. They also suggest degree saturation compared caused more than differences primary minerals involved each water-rock interaction systems. Our point granitic catchment, SF6 concentrations cannot be used dating due their lithogenic production bedrocks.