Structural-kinematic formation conditions of the Dudergof structure development (south-east margin of the Baltic shield)

Abstract

Dudergof heights and deformed Paleozoic cover rocks spatially related to them are located to the South of Saint-Petersburg within Baltic-Ladoga monocline. These elevations make up the straight forms of relief and correspond to the cores of anticlines which are often examined as a glaciotectonic morphostructures. Structural researches show that Dudergof structure is spatially and genetically related to the intersection joint of tectonic zones oriented in East-North-East and South-North directions. It had been formed for a long time, probably, since the Late Caledonian time up to the neotectonic activation stage. Deformations developed in the conditions of the reverse - strike slip mode and periodic appearance of kinematic inversions. The horizontal compression was oriented in North-West direction on certain stages, and in North-East direction - on the others. In the development of the Dudergof structure glaciotectonic factor had a second-rate significance giving rise to the appearance of the minor south-vergent thrusts.

Keywords

• intraplate tectonics
• geodynamic
• glaciotectonic
• strike-sleep shear zone
• kinematics
• structural paragenesis
• east-european platform
• dudergof structure