Tektogeneza waryscyjska Masywu Czeskiego i jej związek z rozłamami wgłębnymi
Abstract
VARISCAN TECTOGENESIS OF BOHEMIAN MASSIF AND ITS RELATION TO DEEP FRACTURE ZONES
Summary
Variscan tectogenesis represents the climax of Paleozoic tectonic activity In the Bohemian massif. The tectonic activity was a continuation of the former, Caledonian or even locally Assyntian tectotnic-metamorphic processes in mobile zones. The heterogeneous and policyclic development was the result of block structure of the massif. The history of development, degree of metamorphism and intensity of folding were different for particular blocks separated by deep fracture zones. Block structure also resulted in diversity of tectonic directions and in rapid changes in metamorphism intensity. Hence the Variscan tectogen, as a whole cannot be regarded as a belt-like mountain area characterized by zonal structure. The Moldanubik area was subjected to metamorphism still in the Upper Paleozoic, as it is evidenced by geochronology. Thus the Moldanubik area cannot be regarded as classic hinterland, but rather as an area of intensive Variscan tectogenesis, resulting in different forms which differ from those found in the neighbouring sedimentary units. The block structure also determined distribution of raw material resources and heterogenic, policyclic nature of metalogenesis, which results in undesirable economical characteristics of the majority of ores in this area.
Summary
Variscan tectogenesis represents the climax of Paleozoic tectonic activity In the Bohemian massif. The tectonic activity was a continuation of the former, Caledonian or even locally Assyntian tectotnic-metamorphic processes in mobile zones. The heterogeneous and policyclic development was the result of block structure of the massif. The history of development, degree of metamorphism and intensity of folding were different for particular blocks separated by deep fracture zones. Block structure also resulted in diversity of tectonic directions and in rapid changes in metamorphism intensity. Hence the Variscan tectogen, as a whole cannot be regarded as a belt-like mountain area characterized by zonal structure. The Moldanubik area was subjected to metamorphism still in the Upper Paleozoic, as it is evidenced by geochronology. Thus the Moldanubik area cannot be regarded as classic hinterland, but rather as an area of intensive Variscan tectogenesis, resulting in different forms which differ from those found in the neighbouring sedimentary units. The block structure also determined distribution of raw material resources and heterogenic, policyclic nature of metalogenesis, which results in undesirable economical characteristics of the majority of ores in this area.