Published: Oct 2002
Pages: 315 - 325
Abstract: The joint network in the Silesian Nappe is composed of a shear system (diagonal sets — SR, SL) — striking in the present position at high angles to map-scale fold axes, a single extension set T — striking sub-perpendicular to these axes, fold parallel joints L and L´ striking parallel or at small angles to map-scale fold axes. For paleostress reconstructions penetrative SR, SL and T joint sets were analysed from 197 outcrops. In the paleostres analysis the angular difference between the σHmax directions calculated from shear (SR, SL) and extension T joints is notable. The angular difference between these σHmax directions suggests that it is a result of a slight tectonic bending of the investigated Silesian Nappe arc, which took place between the nappe thrusting phase and the proceeding uplift phase of this part of the Outer Carpathians arc.
Keywords: Miocene, Oligocene, Outer Carpathian arc, Silesian Nappe, tectonic bending, shear and extensional joints, paleostressDownload PDF document