Preprints
https://doi.org/10.5194/se-2020-133
https://doi.org/10.5194/se-2020-133

  17 Aug 2020

17 Aug 2020

Review status: a revised version of this preprint was accepted for the journal SE and is expected to appear here in due course.

Emplacement of exotic Zechstein slivers along the inverted Sontra Graben (northern Hessen, Germany): clues from balanced crosssections and geometrical forward modelling

Jakob Bolz and Jonas Kley Jakob Bolz and Jonas Kley
  • Department for Structural Geology & Geodynamics, Geoscience Centre, Georg-August-University, Göttingen, 37077, Germany

Abstract. Lens-shaped slivers of Permian (Zechstein) amid Triassic units, appearing along the main boundary fault of the Sontra Graben in central Germany on the southern edge of the Central European Basin System (CEBS) were studied by means of detailed map analysis, a semi-quantitative forward model and two balanced cross-sections. We show how partial reactivation of the graben’s main normal fault and shortcut thrusting in the footwall during inversion, combined with a specific fault geometry involving flats in low shear-strength horizons, produce the observed slivers of exotic Zechstein. Based on regional correlation, extension most likely occurred in Late Triassic to Early Cretaceous time while the contraction is of Late Cretaceous age. The kinematic history of the graben, reconstructed through field observations, structural and cross-section analysis is employed to discuss the dynamic evolution of the graben system in the immediate vicinity and to consider implications for the entire CEBS.

Jakob Bolz and Jonas Kley

 
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Jakob Bolz and Jonas Kley

Jakob Bolz and Jonas Kley

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Short summary
To assess the role smaller graben structures near the southern edge of the Central European Basin System play for the basin’s overall deformational history, we take advantage of a feature found on some of these structures, where slivers from older rock units appear along the graben's main fault, surrounded on both sides by younger strata. The implications for the geometry of the fault provide a substantially improved estimate for the magnitude of normal and thrust motion along the fault system.