Multiphase, decoupled faulting in the southern German Molasse Basin – evidence from 3-D seismic data

摘要: Abstract. We use three-dimensional seismic reflection data from the southern German Molasse Basin to investigate structural style and evolution of a geometrically decoupled fault network in close proximity Alpine deformation front. recognise two arrays that are vertically separated by clay-rich layer – lower normal faults upper reverse faults. A frontal thrust partially overprints array. Analysis stratigraphy, syn-kinematic strata, throw distribution, spatial relationships between suggest multiphase evolution: (1) initiation Upper Jurassic carbonate platform during early Oligocene, (2) development Cenozoic sediments late (3) reverse reactivation thrusting mid-Miocene. These distinct phases document stress field as orogen propagated across foreland. postulate interplay horizontal compression vertical stresses due syn-sedimentary loading resulted intermittent faulting. The gradients within flexed foredeep defined independent development above faults, whereas mechanical behaviour precluded subsequent linkage arrays. must have been facilitated its maximum displacement extent correlate with occurrence these conclude evolving tectonic were primary mechanism activation, stratigraphy pre-existing structures locally governed style.