Quantitative structural analyses and numerical modelling of ...

DTD 5ARTICLE IN PRESSL. Baratoux et al. / Journal of Structural Geology xx (xxxx) 1–24 3Fig. 1. (a) Geological map of the eastern margin of the Bohemian Massif. Inset shows location of the studied area in the frame of European Variscides. (b).Geological map of the Silesian domain based on the geological map 1:200,000 by Pouba (1962) and Roth (1962). Important thrust faults and normal faults areindicated. A–A 0 indicates the position of the cross-section in Fig. 2.Basement orthogneisses display rare upright folding.Metabasites and metasediments of the Devonian volcanosedimentarycover show well-developed mostly asymmetricF 3 folds with axial planes dipping to the NW or SE andsubhorizontal NE–SW-trending hinges (Fig. 2a). The foldsize ranges from the microscopic grain-scale up to metresscalefolds. In the eastern and central parts of the Desnádome the D 3 deformation was post-peak metamorphic andtook place under greenschist conditions as marked bygrowth of chlorite, muscovite and albite along axialcleavage of F 3 folds in metapelites (Schulmann andGayer, 2000). However, it was contemporaneous with theemplacement of the Žulová granite in the west (Cháb andŽáček, 1994; Schulmann and Gayer, 2000), which resultedin the overprinting of the S 2 foliation by a NE–SW-trendingsteep and penetrative foliation S 2–3 (Fig. 2a).111