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Deciphering the Variscan tectonothermal overprint and deformation partitioning in the Cadomian basement of the Teplá–Barrandian unit, Bohemian Massif

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Abstract

The Teplá–Barrandian unit (TBU) has long been considered as a simply bivergent supracrustal ‘median massif’ above the Saxothuringian subduction zone in the Variscan orogenic belt. This contribution reveals a much more complex style of the Variscan tectonometamorphic overprint and resulting architecture of the Neoproterozoic basement of the TBU. For the first time, we describe the crustal-scale NE–SW-trending dextral transpressional Krakovec shear zone (KSZ) that intersects the TBU and thrusts its higher grade northwestern portion severely reworked by Variscan deformation over a southeastern very low grade portion with well-preserved Cadomian structures and only brittle Variscan deformation. The age of movements along the KSZ is inferred as Late Devonian (~380–370 Ma). On the basis of structural, microstructural, and anisotropy of magnetic susceptibility data from the KSZ, we propose a new synthetic model for the deformation partitioning in the Teplá–Barrandian upper crust in response to the Late Devonian to early Carboniferous subduction and underthrusting of the Saxothuringan lithosphere. We conclude that the Saxothuringian/Teplá–Barrandian convergence was nearly frontal during ~380–346 Ma and was partitioned into pure shear dominated domains that accommodated orogen-perpendicular shortening alternating with orogen-parallel high-strain domains that accommodated dextral transpression or bilateral extrusion. The synconvergent shortening of the TBU was terminated by a rapid gravity-driven collapse of the thickened lithosphere at ~346–337 Ma followed by, or partly simultaneous with, dextral strike-slip along the Baltica margin-parallel zones, driven by the westward movement of Gondwana from approximately 345 Ma onwards.

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Acknowledgments

We gratefully acknowledge Gernold Zulauf and Jaroslav Dostal for their very constructive and detailed reviews that helped to improve the original manuscript significantly, and Associate Editor Reinhard Greiling for helpful comments on final version of the manuscript. František Hrouda and Marta Chlupáčová are thanked for providing their AMS data from the Čistá pluton. This study is part of the Ph.D. research of Jaroslava Hajná, supported by Grant No. 134908 from the Grant Agency of Charles University in Prague (GAUK) to J. Hajná, and by the Ministry of Education, Youth and Sports of the Czech Republic Research Plan No. MSM0021620855 and SVV261203.

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Authors and Affiliations

  1. Institute of Geology and Paleontology, Faculty of Science, Charles University, Albertov 6, Prague, 12843, Czech Republic

    Jaroslava Hajná, Jiří Žák & Václav Kachlík

  2. AGICO Inc., Ječná 29, Brno, 62100, Czech Republic

    Martin Chadima

  3. Institute of Geology, Academy of Sciences of the Czech Republic, v.v.i., Rozvojová 269, Prague, 16500, Czech Republic

    Martin Chadima

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  1. Jaroslava Hajná
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  2. Jiří Žák
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  4. Martin Chadima
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Correspondence to Jaroslava Hajná.

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Hajná, J., Žák, J., Kachlík, V. et al. Deciphering the Variscan tectonothermal overprint and deformation partitioning in the Cadomian basement of the Teplá–Barrandian unit, Bohemian Massif. Int J Earth Sci (Geol Rundsch) 101, 1855–1873 (2012). https://doi.org/10.1007/s00531-012-0753-8

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  • DOI: https://doi.org/10.1007/s00531-012-0753-8

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