Non-coaxial deformation of foreland basement involved in a fold-and-thrust belt: a strain partitioning approach to the Eastern Variscan orogen

0572110 - GLÚ 2024 RIV US eng J - Journal Article
Mareček, L. - Melichar, R. - Černý, Jan - Schnabl, Petr - Hrdličková, K. - Buriánek, D.
Non-coaxial deformation of foreland basement involved in a fold-and-thrust belt: a strain partitioning approach to the Eastern Variscan orogen.
Scientific Reports. Roč. 13, May 2023 (2023), č. článku 8143. ISSN 2045-2322. E-ISSN 2045-2322
R&D Projects: GA ČR(CZ) GJ19-02177Y
Institutional support: RVO:67985831
Keywords : Moldanubian Thrust * Orocline * Drag Fold * Variscan Orogeny * Anisotropy of Magnetic Susceptibility
OECD category: Geology
Impact factor: 4.6, year: 2022
Method of publishing: Open access
https://www.nature.com/articles/s41598-023-35400-4

The general SW–NE course of the Variscan orogen in Europe is abruptly bent to the N–S course at its eastern margin, where an oblique convergence occurred. The main suture in this part of the Variscan orogenic belt is called the Moldanubian Thrust, characterized by a dominant dextral strike-slip kinematics and a minor thrust component. The deep level of erosion and the good exposure of this structure allowed us to study the mechanisms of oblique convergence and the incorporation of the foreland basement into the orogenic belt. The combination of small-scale structures with the anisotropy of magnetic susceptibility studies allowed the recognition of two deformations in the studied rocks: dextral simple shearing and drag folding. Due to oblique convergence, the deformations induced by this mechanism were non-coaxial, therefore, their contributions can be easily distinguished. Finally, an overturned, almost recumbent large-scale synformal fold structure in the footwall and an antiformal structure in the hanging wall of the Moldanubian Thrust were formed. These two folds can be interpreted as structures formed by dragging along the Moldanubian Thrust. The previously described sinistral simple shearing in the upper limb of the synform resulted from the original dextral strike-slip shearing, which was overturned during progressive deformation.
Permanent Link: https://hdl.handle.net/11104/0342982