Rotational ductile deformations in the Śnieżnik metamorphic complex (Sudetes)

Abstract

The Snieżnik metamorphic complex, was deformed during the Variscan orogeny by noncoaxial (rotational) deformations (simple shears). These deformations seems to be both longlived and widespread. Different asymmetrical structures was developed by the progressive rotational deformation. These kinematic indicators include e.g: s and d type of porphyroclasts and planar structures S-C and SB (C´). The asymmetrical ones are the most important to determine the sense of shear in the XZ plane of finite ellipsoid deformation. The kinematic analyses of Polish part of the Śnieżnik metamorphic complex indicate general tectonic transport northwards during dextral transgression. The tectonic transport in the western part of this complex (Bystrzyckie and Orlickie Mts.) was top-to-northwest. This ductile displacement was top-to-northeast in the eastern part of the Snieżnik metamorphic complex. Moreover, in the northernmost one the sense of shear was opposite (sinistral wrenching and top-to-southwest). These complex structural patterns explain a fan-like