Preprints
https://doi.org/10.5194/se-2021-95
https://doi.org/10.5194/se-2021-95

  02 Aug 2021

02 Aug 2021

Review status: this preprint is currently under review for the journal SE.

Variscan structures and their control on latest to post-Variscan basin architecture; insights from the westernmost Bohemian Massif and SE Germany

Hamed Fazlikhani, Wolfgang Bauer, and Harald Stollhofen Hamed Fazlikhani et al.
  • GeoZentrum Nordbayern, Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Schlossgarten 55, 91054 Erlangen, Germany

Abstract. The Bohemian Massif exposes structures and metamorphic rocks remnant from the Variscan Orogeny in Central Europe and is bordered by the Franconian Fault System (FFS) to the west. Across the FFS, possible presence of Variscan units and structures are buried by Permo-Mesozoic sedimentary rocks. We integrate existing DEKORP 2D seismic reflection, well and surface geological data with the newly acquired FRANKEN 2D seismic survey to investigate the possible westward continuation of Variscan tectonostratigraphic units and structures, and their influence on latest to post-Variscan basin development. Subsurface Permo-Mesozoic stratigraphy is obtained from available wells and are tied to seismic reflection profiles using a synthetic seismogram calculated from density and velocity logs. Below the sedimentary cover, three main basement units are identified using seismic facies descriptions that are compared with seismic reflection characteristics of exposed Variscan units east of the FFS. Our results show that Upper Paleozoic low-grade metasedimentary rocks and possible Variscan nappes are bounded and transported by Variscan shear zones to ca. 65 km west of the FFS. Basement seismic facies in the footwall of the Variscan shear zones are interpreted as Saxothuringian basement. We show that the location of normal fault-bounded latest to post-Variscan Upper Carboniferous-Permian basins are controlled by the geometry of underlying Variscan shear zones. Some of these Upper Carboniferous-Permian normal faults reactivated as steep reverse faults during the regional Upper Cretaceous inversion. Our results also highlight that reverse reactivation of normal faults gradually decreases west of the FFS.

Hamed Fazlikhani et al.

Status: open (until 26 Oct 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on se-2021-95', Jean-Baptiste Koehl, 22 Sep 2021 reply

Hamed Fazlikhani et al.

Hamed Fazlikhani et al.

Viewed

Total article views: 295 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
239 53 3 295 1 2
  • HTML: 239
  • PDF: 53
  • XML: 3
  • Total: 295
  • BibTeX: 1
  • EndNote: 2
Views and downloads (calculated since 02 Aug 2021)
Cumulative views and downloads (calculated since 02 Aug 2021)

Viewed (geographical distribution)

Total article views: 275 (including HTML, PDF, and XML) Thereof 275 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 23 Sep 2021
Download
Short summary
Interpretation of recently acquired FRANKEN 2D seismic survey in SE Germany show that Upper Paleozoic low-grade metasedimentary rocks are transported by Variscan shear zones to ca. 65 km west of the Franconian Fault System. We show that the location of post-Variscan Upper Carboniferous-Permian normal faults and associated graben and half-graben basins are controlled by the geometry of underlying Variscan shear zones.