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Deformation bands in gravels: displacement gradients and heterogeneous strain

Ulrike Exner and Bernhard Grasemann
Journal of the Geological Society, 167, 905-913, 1 September 2010, https://doi.org/10.1144/0016-76492009-076
Ulrike Exner
University of Vienna, Department of Geodynamics and Sedimentology, Althanstrasse 14, 1090 Vienna, Austria
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Bernhard Grasemann
University of Vienna, Department of Geodynamics and Sedimentology, Althanstrasse 14, 1090 Vienna, Austria
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Abstract:

We analyse deformation bands in middle Miocene deltaic gravels, which can be characterized as disaggregation bands formed by predominant grain rotation without cataclasis of the pebbles. The bands are restricted to single gravel beds, and only a few developed to faults with larger displacement by propagation into over- and underlying finer-grained layers. The deformation bands record a strain gradient from the undeformed host sediment to the core, perpendicular to the shear vector, evidenced by a sigmoidal deflection of markers. Additionally, a strain gradient parallel to the shear vector of the bands is documented by displacement–distance distributions. The resulting heterogeneous displacement in the surrounding host sediment causes a rotation of marker horizons (reverse drag). Between closely spaced deformation bands, the geometries can be explained by the soft-domino model, where fault block rotation is accompanied by ductile deformation adjacent to the faults. The maximum displacement/length ratio of the observed deformation bands lies in the range between 0.01 and 0.1, which seems to be favourable for the development of reverse drag, adjacent to faults as well as deformation bands.

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Journal of the Geological Society: 167 (5)
Journal of the Geological Society
Volume 167, Issue 5
August 2010
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Deformation bands in gravels: displacement gradients and heterogeneous strain

Ulrike Exner and Bernhard Grasemann
Journal of the Geological Society, 167, 905-913, 1 September 2010, https://doi.org/10.1144/0016-76492009-076
Ulrike Exner
University of Vienna, Department of Geodynamics and Sedimentology, Althanstrasse 14, 1090 Vienna, Austria
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: ulrike.exner@univie.ac.at
Bernhard Grasemann
University of Vienna, Department of Geodynamics and Sedimentology, Althanstrasse 14, 1090 Vienna, Austria
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site

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Deformation bands in gravels: displacement gradients and heterogeneous strain

Ulrike Exner and Bernhard Grasemann
Journal of the Geological Society, 167, 905-913, 1 September 2010, https://doi.org/10.1144/0016-76492009-076
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    • Abstract:
    • Regional geology and host sediment
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