Correlation of Quaternary Sediments and Tectonic Activity of the Eastern Part of the Drava River Depression

Abstract

The Holocene, Upper Pleistocene and Middle Pleistocene sedimentsin the eastern part of the Drava depression the substratum ofwhich is determined by the conditional EK marker Q', are composedin the lower part mainly of silts and clays and in the upper part ofsands. The thickest parts are about 400m. The composition of thetransparent heavy minerals and the result of the paleontological treatment show that the sedimentation was in the lake or swamp with the origin of detritus from the metamorphic rocks and smaller quantity ofolder clastic sediments.The collected data show the quaternary tectonic activity after thesedimentation of the marker horizon Q'. In the area between the boundary faults of the valley, the faults of the system E.N.E. - W.S.W. (N.E. - S.W.) influenced directly the sedimentation and the folding . Theywere the consequence of the regional movements and stress strainbehaviour of rock masses, which built the structures of the valley.As a result, the horizontal component of the left wing movement isvisible along the diagonal system of faults. The vertical movementshave also been determined. The greatest amplitudes were along theboundary South fa ul t of the Drava valley, up to 350m for the periodof Middle and Upper Pleistocene, or 90m for Upper Pleistocene only.