Structural evidence for superposition of transtension on transpression in the Zagros collision zone: Main Recent Fault,Piranshahr area,NW Iran |
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| Institution: | 1. Department of Geological Engineering, Karadeniz Technical University, 61080 Trabzon, Turkey;2. Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;3. School of Earth Science and Mineral Resources, China University of Geosciences, 29 Xue-Yuan Road, Haidian District, Beijing 100083, China;4. Korea Basic Science Institute, YangCheong 804-1, Ochang, Cheongwon, Chungbuk 363-883, South Korea;5. Department of Geological Engineering, Gumushane University, 29000 Gumushane, Turkey;1. Department of Mining Engineering, Gümü?hane University, TR-29000 Gümü?hane, Turkey;2. Department of Geological Engineering, Karadeniz Technical University, TR-61080 Trabzon, Turkey;3. CNRS (CNRS/INSU) UMR 6118, Géosciences Rennes, Université de Rennes 1, F-35042 Rennes Cedex, France;4. Université de Rennes 1, Géosciences Rennes, F-35042 Rennes Cedex, France |
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| Abstract: | The Main Recent Fault of the Zagros Orogen is an active major dextral strike-slip fault along the Zagros collision zone, generated by oblique continent–continent collision of the Arabian plate with Iranian micro-continent. Two different fault styles are observed along the Piranshahr fault segment of the Main Recent Fault in NW Iran. The first style is a SW-dipping oblique reverse fault with dextral strike-slip displacement and the second style consists of cross-cutting NE-dipping, oblique normal fault dipping to the NE with the same dextral strike-slip displacement. A fault propagation anticline is generated SW of the oblique reverse fault. An active pull-apart basin has been produced to the NE of the Piranshahr oblique normal fault and is associated with other sub-parallel NE-dipping normal faults cutting the reverse oblique fault. Another cross-cutting set of NE–SW trending normal faults are also exist in the pull-apart area. We conclude that the NE verging major dextral oblique reverse fault initiated as a SW verging thrust system due to dextral transpression tectonic of the Zagros collision zone and later it has been overprinted by the NE-dipping oblique normal fault producing dextral strike-slip displacement reflecting progressive change of transpression into transtension in the collision zone. The active Piranshahr pull-apart basin has been generated due to a releasing damage zone along the NW segment of the Main Recent Fault in this area at an overlap of Piranshahr oblique normal fault segment of the Main Recent Fault and the Serow fault, the continuation of the Main Recent Fault to the N. |
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| Keywords: | Collision zone Main Recent Fault NW Iran Piranshahr Strike-slip fault Zagros |
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