Ewolucja paleotektoniczna kambru świętokrzyskiego

Włodzimierz Mizerski




The analysis of tectonic structures in paleozoic rocks of the Holy Cross Mts (Central Poland), situated at the EastEuropean Platform foreland (Fig. 1), indicates five major phases of tectonic deformations of Cambrian rocks in the Holy Cross Mts can be identified: synsedimentational, Early Caledonian, Late Caledonian, Variscan and Laramian phases. The Cambrian rocks were deformed in all phases in the Kielce block, and in the Łysogóry block - only in the Variscan and Laramian phases. During the synsedimentational phase structures typical for the submarine slides originated (Fig. 2). During the Cambrian the transversal dislocation in the bottom of the sedimentary basin was active, influencing the rate of subsidence and sedimentation. Main tectonic structures of the Cambrian rocks tectonic structure in the Kielce block originated during the Early Caledonian movements (Fig. 3) as a result of the collision of the Kielce block and Rzeszów-Miechów block (Fig. 4), as evidenced by the reversed faults and folds overturned to the N (Fig. 5, 6). As a result of the Late Caledonian movements in the Kielce block mainly the fault structures originated. Directions of the main tectonic stress in the Early and Late Caledonian movements differ at 20° (Fig. 8). The Variscan movements were the first tectonic movements, which deformed the Cambrian rocks in the Łysogóry block. At that time all main tectonic structures of the Holy Cross Mts originated (Fig. 7, 8). Variscan deformations came into being as a result of overthrusting the Variscan Orogen of Western Europe at the foreland (Fig. 10). Laramian movements did not change the tectonic structure of the Cambrian rocks in the Holy Cross Mts. These movements caused only rebuilding at the southwestern part of the Kielce Block (Fig. 11).