Pre-Variscan tectonometamorphic evolution of Zábřeh crystalline unit and its geotectonic position

This thesis is focused on the study of the evolution of the Zábřeh crystalline unit on the eastern margin of the Bohemian Massif. The main focus is U-Pb dating of detrital zircons obtained from metasediments of the zábřeh series and dating of magmatic zircons from metamorphosed rocks in the vicinity of the village Hynčina. The data are supported by structural analysis, petrographic descriptions and geochemical analyses of rocks. The thesis aims to determine the age of sedimentation and protoliths and thus clarify the interrelationship of the subunits forming the Zábřeh crystalline unit. The results of the thesis indicate that the Zábřeh crystalline unit represents a segment of cambro- ordovician rift zone developed along northern margin of Gondwana affected by early Variscan metamorphism likely related to mid-Devonian back-arc extension. Keywords: Zábřeh crystalline unit, Eastern margin of Bohemian Massif, pre-variscan tektonometamorphic evolution, U-Pb zircon datin