Abstract
The tectonostratigraphy within eastern sections of the Bohemian Massif includes two different terranes. A Proterozoic terrane is composed of the Moravo-Silesian parautochthon, the Moravian nappe complex and the Moldanubian Variegated and Monotonous complexes. A Paleozoic terrane includes the Gfohl Gneiss and the granulite klippen. Both terranes are separated by an oceanic suture zone which is represented by the Letovice ophiolite complex (Czech Republic) and the Raabs complex in Austria. The Raabs structural unit is interpreted to represent a tectonic melange of a dismembered ophiolite complex and metaandesites. The tectonic evolution of the southeastern Bohemian Massif includes: (1) Paleozoic extension predating late Variscan nappe stacking; (2) Variscan (c. 350-320 Ma) NE-directed nappe assembly by foreward propagation of thick-skinned nappes, whereas individual thrusts initiated within different crustal levels; (3) post-stacking Variscan W-E extension which was responsible for penetrative nappe internal deformations; and, (4) dispersion of units by a system of dextral strike-slip faults and genetically related thrust- and normal faults. The kinematic history during Variscan convergence is explained to have been related to oblique (dextral) transpression of Proterozoic against Paleozoic terranes.
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