The effect of basement step/topography on the geometry of the Zagros fold and thrust belt (SW Iran): an analog modeling approach |
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| Authors: | A Farzipour-Saein F Nilfouroushan H Koyi |
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| Institution: | 1. Department of Geology, University of Isfahan, 81746-73441, Isfahan, Iran
2. Hans Ramberg Tectonic Laboratory, Department of Earth Sciences, Uppsala University, Villav?gen 16, SE-752 36, Uppsala, Sweden
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| Abstract: | Systematic analog models are run to study the variation in deformation across basement steps in the Zagros fold-thrust belt. Our model results demonstrate that basement configuration/topography influences the sedimentation thickness and, hence, the kinematics and geometric evolution of the fold and thrust belt. The greater the difference in thickness between the adjacent cover units across a basement step, the sharper and clearer will be the offset of the deformation front. Based on model results, we conclude that in a fold-thrust belt, where basement step/topography is covered by a layer of ductile salt acting as a decollement, the effect of the salt decollement on the evolution of the belt is far greater than the effect of thickness variation of the cover units. |
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