International Journal of Earth Sciences

, Volume 106, Issue 8, pp 2963–2972 | Cite as

Restoration of the Cretaceous uplift of the Harz Mountains, North Germany: evidence for the geometry of a thick-skinned thrust

Original Paper

Abstract

Reverse movement on the Harz Northern Boundary Fault was responsible for the Late Cretaceous uplift of the Harz Mountains in northern Germany. Using the known geometry of the surface position and dip of the fault, and a published cross section of the Base Permian horizon, we show that it is possible to predict the probable shape of the fault at depth, down to a detachment level. We use the ‘inclined-shear’ method with constant heave and argue that a shear angle of 30° was most likely. In this case, the detachment level is at a depth of ca. 25 km. Kinematic restoration of the Harz Mountains using this fault geometry does not produce a flat horizon, rather it results in a ca. 4 km depression. Airy–Heiskanen isostatic equilibrium adjustment of the Harz Mountains restores the Base Permian horizon to the horizontal, as well as raising the Moho to a depth of 32 km, a typical value for northern Germany. Restoration also causes a rotation of tectonic fabrics within the Harz Mountains of about 11° clockwise. We show that this model geometry is very good fit to the interpreted DEKORP BASIN 9601 deep seismic profile.

Keywords

Thrust fault Detachment depth Harz Mountains Cretaceous Inversion 

Notes

Acknowledgements

We acknowledge various discussions with colleagues about the Harz Mountains, especially Christian Brandes, Carl-Heinz Friedel, Bernd Leiss, and Axel Vollbrecht. Jonas Kley and Klaus Reicherter provided positive and comprehensive reviews. We thank Midland Valley Exploration for use of their Move software, which was used to carry out the restoration.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.Leibniz Institute for Applied Geophysics (LIAG)HannoverGermany
  2. 2.Helmholtz Centre Potsdam, GFZ German Research Centre for GeosciencesPotsdamGermany
  3. 3.TU BerlinBerlinGermany

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