Abstract

Scaled analogue sandbox models have been used to simulate the growth of Coulomb thrust wedges that include syntectonic sedimentation during thrusting. Increases in the syncontractional sedimentation rate dramatically change the shape of the Coulomb thrust wedge, decreasing the number of thrust slices, the internal shortening, and the critical taper of the wedge. Thrust trajectories change from ramp-flat to sigmoidal with increased syncontractional sedimentation. The analogue models show many similarities to thrust-fault geometries in accretionary prisms and foreland fold-and-thrust belts in which thrust slices prograded into basins with active sedimentation.

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