This research deals with the geometry of Khalakan Anticline by using field data. The anticline is located in NE Iraq, within the High Folded Zone of the Iraqi Western Zagros Fold -Thrust Belt where the southwestern limb of it represents the boundary between the Low and High folded zones. The age of the exposed rocks in the study area ranges from Cretaceous to Late Pliocene. Qamchuqa and Kometan formations expose in the two limbs as oldest rocks, while the youngest rocks in the northeastern limb are covered by Dokan Conglomerate. Consequently the fold geometry was determined by the measured field data of Qamchuqa and Kometan formations only. Khalakan anticline was described as asymmetrical and overturned fold, with northeastern vergency, where the mean attitude of the NE limb is 220 ᴏ /89 ᴏ and the mean attitude of the SW limb is 219 ᴏ /55° in terms of dip direction and dip amount. The attitude the fold axis in terms of trend and plunge is 130°/1°, the attitude of the axial plane is 220°/72° in terms of dip direction and dip amount, the interlimb angle is 34°, consequently the fold was classified as Close Fold.
Folds of northern Iraq are considered integral part for the Western Zagros Fold – Thrust Belt. The growth of these folds was due to inversion displacement on inherited listric faults. This research deal with the relationship between the folds vergency and the faults that propagated folds, where that the dip of the back limb (gentle limb) for the fold is parallel to the thrust fault surface that propagated the fold, and the vergency of the fold determined by the forelimb (steep limb) situation. As a results, the folds of the high folded zone and of the western part of the low folded zone showed suture ( N and NE) vergency and foreland (S and SW) vergency, while the eastern part of the low fold zone showed foreland (S and SW) vergency only. The appearance of the suture and foreland vergency within the high folds considered as indication to the high tectonic development conformable with the location of these folds in the Iraqi Zagros Fold Belt, while the appearance of the suture and foreland vergency in the western part of the low folded zone attributed to the more tectonic development of this part in comparison with the eastern part of the zone that there folds appeared foreland vergencies only, or to the influence of the evaporite beds for Fatha formation in this part. http://dx.doi.org/10.25130/tjps.25.2020.031
This study aims to assess the stability of the rock slopes on both sides of the road linking (Shaqlawa- qoysinjaq) to some of the exposed geological formations within the northeastern limb of the Safin anticline (Qamchuqa, Bakhma, Shiranish), where (6) stations were selected and a classification was made. An engineering description of the rock layers through a comprehensive survey of the study area, the results of the kinematic analysis by the kinematic analysis software (DIPS) showed that the possible percentage failures were represented by rock toppling (83.33%), planar sliding by (58.33%) and then wedge sliding by percentage (83.34%), By studying the factors affecting the stability of slopes in the region, it was found that the main factor causing the failures is the result of cutting the fold for the purpose of road construction, in addition to the structural and lithological factors.
The study area is located in the southeastern part of Safen Anticline, northeastern Iraq. The aim of the study is to discuss the listric fault role in the change of the deposition basin topography of Bekhme and Shiranish formations and finally change of their thicknesses. The field data picked up in September of 2020 include bed attitudes and formation boundaries, with their positions. After the drawing of three cross sections and calculating the thickness of Bekhme and Shiranish formations in the studied area, the results showed that the thickness of the Bekhme Formation which represents the reef environment, increases in thickness within the northeastern limb of the fold, While the thickness of the Shiranish Formation which represents the deep environment, increases within the southwestern limb of the fold. These changes were concluded as result occurred due to the reverse movement of the Listeric fault responsible for the growth of the fold synchronously with Bekhme and Shiranish formation deposition.
Folds of northern Iraq are considered integral part for the Western Zagros Fold – Thrust Belt. The growth of these folds was due to inversion displacement on inherited listric faults. This research deal with the relationship between the folds vergency and the faults that propagated folds, where that the dip of the back limb (gentle limb) for the fold is parallel to the thrust fault surface that propagated the fold, and the vergency of the fold determined by the forelimb (steep limb) situation. As a results, the folds of the high folded zone and of the western part of the low folded zone showed suture ( N and NE) vergency and foreland (S and SW) vergency, while the eastern part of the low fold zone showed foreland (S and SW) vergency only. The appearance of the suture and foreland vergency within the high folds considered as indication to the high tectonic development conformable with the location of these folds in the Iraqi Zagros Fold Belt, while the appearance of the suture and foreland vergency in the western part of the low folded zone attributed to the more tectonic development of this part in comparison with the eastern part of the zone that there folds appeared foreland vergencies only, or to the influence of the evaporite beds for Fatha formation in this part.
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