Fig. 8From: Deep hydrochemical section through the Central Alps: evolution of deep water in the continental upper crust and solute acquisition during water–rock-interaction along the Sedrun section of the Gotthard Base TunnelChloride vs. fluoride concentration in mmol L−1. Samples with F > Cl in red, samples with F < Cl as blue dots. All samples from the Gotthad Massif (GM). m = slope of reference linesBack to article page