Fig. 9From: 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 TunnelDissolved aqueous silica in mg L−1 vs. pH. Computed saturation with respect to quartz at 35 °C and 45 °C from PHREEQC (Parkhurst & Appelo, 1999)Back to article page