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Swiss Journal of Geosciences
Fig. 10 | Swiss Journal of Geosciences

Fig. 10

From: Geology along the Bedretto tunnel: kinematic and geochronological constraints on the evolution of the Gotthard Massif (Central Alps)

Fig. 10

Field photographs and photomicrographs of G-SZ. a Strain localization at the boundary between coarser grained granite in the SE and finer grained granite in the NW, pencil for scale. b G-SZ in the meter range, as typically observed between TM 2800 and the NW terminus of the tunnel (TM 5218). c Shear sense indication by sigmoidal aggregate, pencil for scale. d–g Thin section cutouts of a G-SZ at TM 1350. The italic roman numbers correspond to descriptions related to dynamic recrystallization (Sect. 3.2.4): (i) quartz in coarse-grained domain surrounded by fine-grained bands, (ii) ‘island’ grain in coarse-grained domain, (iii) irregular grain boundary in coarse-grained domain, (iv) elongated quartz grain in fine-grained domain

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