The Yiqikelik anticline is an open vertical anticline of basement involvement type in the eastern part of the northern belt of Kuqa fold and thrust belt in the northern margin of Tarim Basin.It was formed as a hydrocarbon structure under the background of Late Hercynian paleo-uplift and foredeep zone of the Kuqa peripheral foreland basin in the Indosinian Period.The oldest strata emerging from the anticlinal core is the Lower Cretaceous series.In the direction of the two wings,the Paleogene,Neogene and Quaternary appeared successively.Drilling data reveal that there are also Triassic and Jurassic coal-bearing clastic formations below,unconformbaly overlie the carboniferous limestone.The Miocene Jidike Formation to Pleistocene Xiyu Formation is the growth stratum of the anticline deformation,and the Paleogene and its substrata are the pre-growth strata.The anticline is in the root zone of the fold-thrust belt and developed thick-skin structures.Towards the front fold-thrust belt,it gradually evolved into thin-skinned structure.The two main detachment faults in the fold-thrust belt were developed in the Jurassic coal seam and the gypsum-salt layer in Jidike Formation respectively.As a remote effect of the India-Asia collision,the deformation of the anticline began from the end of Paleogene to the beginning of Neogene,with several deformation accelerations and thrust in pulse,until the Late Quaternary.
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