Fig. 5

Chronogram linking greenschist-facies microstructures along the DBBT with their respective deformation phase and tectonic events in the Western Alps between ~43 and 30 Ma; all photomicrographs were taken with crossed polarizers. a Sample FD07: Ultramylonite from the DBBT near Ollomont; a GSPO of quartz, recrystallized by SGR, indicates top-WNW shearing during formation of the D1 mylonitic foliation; Fol (88/23) Lin (119/19). b Sample FD215: Gneiss from the locality Mountet in the upper Val de Zinal showing D2 top-SE shear bands; Fol (243/42) Lin (312/22). c Sample FD48: Mylonite from the DBBT north of Breuil-Cervinia showing D3 conjugate top-NW/-SE shear bands which overprint the preexisting metamorphic layering; Fol (222/03) Lin (312/01). d Sample FD07: A SE-dipping D4 crenulation cleavage overprints the mylonitic foliation. e Sample FD270: Mylonite from the DBBT SW of Breuil-Cervinia showing networks of mainly brittle top-NW shear planes; Fol (270/63) Lin (326/47); References: (1) Angiboust et al. (2014); (2) Barnicoat et al. (1995); (3) Amato et al. (1999); (4) Reddy et al. (1999); (5) Cartwright and Barnicoat (2002); (6) Skora et al. (2015); (7) Herwartz et al. (2011); (8) Sandmann et al. (2014); (9) Davis and von Blanckenburg (1994); (10) Schlunegger and Kissling (2015) and references therein; (11) Keller et al. (2005a) and references therein; (12) Hurford et al. (1991); (13) Bistacchi et al. (2001)