Fig. 4

Series of NW–SE striking, schematic cross-sections depicting the geometry of the DBBT, dominant shear senses, and the deformation phases affecting each respective area; colour coding corresponds to the one in Fig. 1; locations of deformation structures in Figs. 2 and 3, and online resource (OR) 1 are indicated. a Zinal: The DBBT is folded on a regional scale; D1 top-(N)W foliations and folds are overprinted by D2 top-SE shear bands and partly D5 top-SE brittle faults. b Arolla: The DBBT is folded on a regional scale due to D4 compression overprinting D1 top-(N)W foliations. c Ollomont: D1 top-(N)W foliations are overprinted by D4 crenulations; D2 top-SE shear bands occur within Combin calcschists in the footwall of the DBBT. d Zermatt: D1 top-(N)W foliations are overprinted by D5 semi-ductile top-NW shear bands; D4 upright to NW-vergent folds occur in the footwall of the DBBT. e Breuil: D1 top-(N)W foliations are overprinted by D3 top-NW/-SE conjugate shear zones; subsequent D4 NW-vergent folds are overprinted by semi-ductile to brittle top-NW shear bands and faults. f Becca d’Aver: D1 top-(N)W foliations and the DBBT are folded into a SSW-closing synform; D1 foliations are overprinted by D2 top-SE shear zones and steeply-dipping D5 semi-ductile to brittle conjugate shear bands and faults