The deformation features and basinrange coupling structure in the northeastern Pamir tectonic belt
Chen Hanlin1,2 Zhang Fenfen1,2 Cheng Xiaogan1,2,3 Liao Lin1,2 Luo Juncheng3 Shi Jun3Wang Buqing3 Yang Changfu1,2 Chen Lifeng1,2
(1.Department of Earth Sciences|Zhejiang University|Hangzhou|Zhejiang 310027； 2.Structural Research Center of Oil &|Gas Bearing Basin Ministry of Education|Hangzhou|Zhejiang 310027； 3.Exploration and Development Research Institute of Tarim Oilfield|Kuerle|Xinjiang 841000)
Wupoer area is the key area to know the deformation of northeastern Pamir and the basinrange coupling structure between northeastern Pamir tectonic belt and Tarim Basin. Combing with geological survey data and borehole drilling data，this paper studies the deformation and basinrange coupling structure systemically using CEMP and seismic profile data. This paper thinks that the basinrange coupling structure is opposite thrusting structure which is northward thrusting in Pamir tectonic belt and is southward thrusting in southern Tienshan tectonic belt. In front of Pamir tectonic belt there is basement involvement thrust belt which Paleozoic and Mesozoic sequence thrust onto Neogene and Quaternary sequence. In the north，there is a blind thrust system in lower part and Quaternary piggyback basin in upper part controlled by the Wupoer thrust fault. The Cenozoic deformation of northeastern Pamir tectonic belt began at late Pliocene and lasted to present and caused the formation of unconformities between Xiyu formation of early Pleistocene(Q1x)and Neogene，middle Pleistocene and early Pleistocene，upper Pleistocene and middle Pleistocene. The deformation minimum shorting quantity and minimum shorting ratio are 486 km and 481％.