Fig. 8

Schematic block models of the study area for the Late Cretaceous to Paleogene deformation events. a Late Cretaceous block model illustrating the emplacement of the Lechtal thrust sheet (LTS) onto the Allgäu thrust sheet (ATS). The Lechtal thrust is accompanied by dextral strike slip faults where it recesses around the rheological irregularity of the Early Jurassic half-graben shoulder and its basin in the footwall. Folding and out-of-sequence thrusting (dashed lines) take place in the Allgäu thrust sheet and nappe internal thrusting occurs in the Lechtal thrust sheet. Dextral bending of the Lechtal thrust generates a discrete high angle tear fault in the Lechtal thrust sheet. The Birkental syncline in the Allgäu thrust sheet immediately below the Lechtal thrust mimics the bend of the Lechtal thrust. b Block model illustrating the Paleogene deformation. Within the Lechtal thrust sheet the NW-striking dextral Weissenbach tear fault laterally compensates differential shortening, which is expressed by duplex stacking in the W and normal strain in the E. In the Allgäu thrust sheet out-of-sequence thrusts dissect the regional fold architecture, and a tightly folded and thrusted tectonic shear zone develops below the Lechtal thrust (indicated by red dashed lines)