Fig. 4

a Damage zone and fault core (sample KR5) within the Polinik Block. AFT ages and track length distributions differ significantly (orientation of the fault plane: 045/79). b Fine grained gouge material of the brittle fault. c Damage zone structure of the brittle fault. d Sketch of the brittle fault in the Polinik Block. The fault zone comprises on single fault core composed fine-grained, grey-coloured gouges and lensoid dark cataclasites (shown in black). KR5 fc (fault core) and KR5 dz (damage zone) display sample localities for fission track analysis. For comparison see Fig. 4a. e Sketch of the brittle structure along the Ragga–Teuchl fault. The fault zone shows multiple cores that are separated and surrounded by damage zone material. KR6 fc (fault core) and KR6 dz (damage zone) display sample localities for fission track analysis