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Kinematic Analysis of Geomorphic Markers and Estimation of the Relative Rate of Active Deformations along the Hormud Quaternary Fault- East of Central Zagros

Document Type : Original Research Paper

Authors

1 M. Sc., Research Institute of Earth Sciences, Geological Survey of Iran, Tehran, Iran

2 Ph.D., Seismotectonic and Seismology Department, Geological Survey of Iran, Tehran, Iran.

3 Ph.D., Geological Survey of Iran, Tehran, Iran.

Abstract

Young deformations and folds are one of the impressive characteristics of Zagros simple folded belt. The studied structure is Hormud fault-related fold which is situated in the coastal Fars and the southward of Lar town. In order to illustrate the geometry of the studied structure and its kinematic relationship with north and south structures, a structural cross section with ~27 km length from NE to SW was prepared. This study showed that Hormud anticline has been formed in the footwall of Lar fault, synchronous with kinematic reorganization in the core of Lar anticline and increasing horizontal stresses. Interpretation of crustal young deformations in the vicinity of the footwall of Lar fault indicates that Hormud anticline is growing in the form of a constant limb length detachment fold. Estimation of relative shortening rate (0.9± 0.2) for south limb of Hormud anticline is showing its fast growth in the form of a rocket fold which was associated by fast propagation of Hormud fault toward the surface. As a consequence of this process, kinematic model of Hormud anticline changes from a constant limb length detachment fold to a shear fault bend fold. Estimations predict 0.7 ± 0.1 mm/yr relative uplift rate for young Hormud anticline in its crest.
 

Keywords

References
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Scientific Quarterly Journal of Geosciences
Volume 22, Issue 86
December 2012
Pages 135-142
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