Geometrical Analysis of the Asos and Dokan Anticlines in Imbricated and High Folded Zones of the Zagros Fold-Thrust Belt, Iraqi Kurdistan Region
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Abstract
The Asos and Dokan anticlines are situated in the Imbricated and High Folded zones, respectively, in the NW segment of Zagros Fold and Thrust Belt within the Kurdistan Region of Iraq. The balanced section across these structures was constructed manually on the graph-paper by employing the kink-band methods and restored to their pre-deformed shape, the constructed balanced cross-section was constrained by integrating intensive surface geological observations and available subsurface seismic sections. The study aims to understanding the geometry of the structures as well as fold and fault architecture at depth. The structures are slightly asymmetrical with steeper forelimb and wide crestal region. The average horizontal shortening values of the Dokan and Asos anticlines are (7.21 %) and (17.05 %) respectively, and the fault-related shortening decrease upsection. The Asos anticline exhibits greater fault-related shortening values compared to the Dokan structure due to higher deformation intensity via thrusting processes. The studied section implies that the structures representing thrust-related anticline and the Dokan anticline show pop-up geometry, while Asos exhibits imbricate fan thrust.
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