Complex deformation history of the Keszthely Hills, Transdanubian Range, Hungary

Abstract We have investigated the deformation history of Keszthely Hills (Transdanubian Range, W Hungary), which belongs to uppermost slice Austroalpine nappe system. This Upper Triassic Miocene sedimentary rock sequence documented upper crust during repeated rifting and inversion events. structural pattern stress field evolution this multistage by data collection evaluation from surface outcrops. Regarding Mesozoic deformations, we present additional arguments for pre-orogenic (Triassic Jurassic) extension (D1 D2 phases), is mainly characterized NE–SW extensional structures, such as syn-sedimentary faults, slump-folds, pre-tilt conjugate normal fault pairs. NW–SE-striking map-scale faults were also connected these phases. The structures took place middle part Cretaceous; however, minor contractional possibly reoccurred until Early (D3 D5 phases). related meso- are gentle open folds, thrusts strike-slip faults. measured various orientations, classified into three states or fields on basis criteria, tilt-test, and/or superimposed striae same planes. For multi-directional shortening presented different scenarios. Our preferred suggestion would be oblique highly influenced orientation compressional resulted in an inhomogeneous with local vicinity inherited older structures. post-orogenic a new event, opening Pannonian Basin Miocene. following groups: immediate pre-rift phase (D6), syn-rift E–W (D7a) N–S transpression (D7b), post-rift NNW–SSE (D8).