Granitoidy w poddewońskim podłożu obszaru Bielsko – Andrychów

Abstract

GRANITOIDS IN THE SUB-DEVONIAN BASEMENT OF THE BIELSKO - ANDRYCHÓW AREA

Summary

Drillings made in the Bielsko - Andrychów area have demonstrated that the Lower Devonian formations discovered for the first time in 1963 by bore hole Bielsko 4 (K. Konior 1964, 1965; K. Konior, W. Krach 1965) makes the oldest, unaltered complex of Palaeozoic strata (K. Konior 1965, 1966, 1967, 1968). These are underlain with the following formations of the metamorphic-crystalline basement: 1 - metasomatic granitoids pierced by bore hole Bielsko 4 at a depth of 1970,0-2006,1 m (W. Heflik, K. Konior 1965, 1967); 2 - diallage-olivine gabbro encountered in bore hole Andrychów 3 at a depth of 2387,5-2453,1 m; 3 -mica-chlorite-quartz schists found in bore hole Andrychów 4 at a depth of 2378,5-2425,0 m; 4 – granitoids ascertained by bore hole Kęty 9 at a depth of 1790,4-1984,0 m; 5 – granitoids pierced by bore hole Kęty 7 at a depth of 1650,0-1756,0 m; 6 - granitoids found in bore hole Kęty 8 at a depth of 1425,0-1466,0 m.
The discovery of the granitoids by bore holes Kęty 9, Kęty 7, and Kęty 8 pints, in relation to the metasomatic granitoids previously discovered by bore hole Bielsko 4 (W. Heflik, K. Konior 1965, 1967), that these rocks are found within a larger areas of the sub-Devonian basement. Their genesis will be elucidated in detail during additional research. On the basis of the present-day knowledge we may only suppose that the granitoids under consideration are a result of granitization processes, accompanied by metasomatitc activity of some older formations, so far undetermined precisely. The occurrence of these rocks in the neighbourhood of the diallage-olivine gabbros (W. Hef1ik, K. Konior l967) points to an analogy in geological situation with the area of granitoid occurrence in the zone of Niemcza and with the accompanying basic rooks in the Lower Silesian area.