O budowie paleozoicznego podłoża w brzeżnej części Karpat obszaru Cieszyn - Andrychów

Abstract

ON THE PALAEZOIC SUBSTRATUM STRUCTURE IN THE MARGINAL PART OF THE CARPATWANS IN THE CIJESZYN  -ANDRYCHÓW AREAIn the Cieszyn - Andrychów area, the Palaeozoic metamorphic substratum investigated by deep bore-holes, represents the lowermost structural stage within the marginal part of the Carpathians. Structure and relief of this substratum exerted a decisive influence on the then developing Flysch units, especially on development and course of the Miocene transgression. Seismic investigations carried: out in 1960 and 1961, as well .as deep drillings allowed to recognize the relief of substratum surface and its structure in the area under study.Within the substratum of the area between Cieszyn and Andrychów, numerous elevations occur, separated by depressions of various type. Faults crossing both the convex and the concave forms of the substratum amphasize the differences appearing among them, Amidst the convex forms the following ones are worthy of attention: "Zebrzydowice hump", "Kaczyce Górne hump", "Cieszyn ridge", ''Drgomyśl ridge", "Iłownica hump", "Bielowicko hump", "Bronów-Międzyrzecze-Jasienica ridge", "Wapienica Górna ridge"" "Dziedzice swelling" extending southeast-wards, "Pisarzowice hump", and "Bułowice ridge". The elevations said show various heights. While the top part of the ''Cieszyn ridge" rises up to 196 m, the average height of the substratum elevations lies between 339 m and 600 m, whereas the lowermost one is between 600 m and 700 m. The surface depressions occurring in the area in question reach approximately 800 m. In the southern part considerable depressions reach as much as 1100 m. These are depressions of Skoczów Górki Wielkie - Brenna, Międzyrzecze - Bielsko - Straconka and Klinczuga - Witkowice - Nidek – Wieprz – Inwałd.In general, the substratum of the area discussed is built up of marginal beds and of the Lower Carboniferous-Devonian carbonate series occurring beneath them (Carboniferous limestones, Devonian limestones and dolomites), and resting on the metamorphic rocks. The rocks of this group are cut by longitudinal and transversal faults into separate blocks elevated or lowered to each other. This block pattern of the substratum tectonics may be very distinctly observed in the area discussed.