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Swiss Journal of Geosciences
Fig. 1 | Swiss Journal of Geosciences

Fig. 1

From: 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 Tunnel

Fig. 1

Schematic geological map showing the course of the Gotthard Rail Base Tunnel. The Sedrun section is highlighted in white, the Amsteg section in black. The tunnel traverses from north to south Pre-Alpine basement of the Aar-Massif (AM), the Tavetsch Intermediate Massif (Tavetscher Zwischenmassiv, TZM), the Gotthard-Massif (GM), and the Penninic Gneiss-Zone. These basement units are separated by in part young-Paleozoic and Mesozoic sedimentary units of the Clavaniev-Zone (CZ), the Urseren-Garvera-Zone (UGZ), and the Piora-Zone. Tertiary Alpine orogeny deformed the Pre-Alpine basement and N-S compression resulted in steeply dipping units (Fig. 2) and E-W trending foliation (Steck & Hunziker, 1994)

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