Study Of Carboniferous-Permian System Tectonic Deformation In The Eastern Part Of The Yin'e Basin

The Yin'er Basin is located in the southern margin of the middle section of the Central Asian orogenic belt.It is limited to Siberia,Tarim,Alashan,Erdos,North China and other plates(land masses),plus the Altun strike-slip fault zone,the Hongshishan fault zone,and the Engelwusu fault.With a large number of large structural belts converging and developing here,it contains rich geological information.It is an ideal place to study the deformation characteristics of the Central Asian orogenic belt and restore the subduction and erosion of the ancient Asian Ocean,collisional integration and intracontinental evolution.At the same time,as a typical representative of the petroliferous basins in northern China,the Carboniferous-Permian in the Yin'e Basin has good prospects for oil and gas exploration.This study is guided by plate tectonics and intracontinental tectonic theory,with basin formation and evolution as the main line,based on detailed field geological surveys and systematic laboratory analysis,combined with geophysical data and tectonic-thermal chronology data,and fully The research results of pre-absorption pre-existing people were used to analyze the tectonic deformation characteristics of the Carboniferous-Permian in the eastern part of the Yin'e Basin,and to explore the formation and evolution process and dynamic mechanism of the Yin'e Basin.Studies suggest that:(1)At least five structural deformations have been developed since the deposition of the Carboniferous-Permian strata in the eastern part of the Yin'e Basin.Among them,D1 is the subduction collision structure deformation,and the development of large-scale closed inverted folds,thrust nappe faults and strong physical and chemical zones such as subduction and collision deformation structures.With the tectonic deformation in this period,the Early and Middle Triassic strata are missing,the magmatism is intense,and the Late Triassic continental mound is constructed with angular unconformity contact with the underlying strata;D2 is the extrusion tectonic deformation,and the development thrust is pushed.The structure is covered,and normal-open folds and NE-trending faults are formed at the same time.The NE-trending rift structure in the Yin'e basin is inferred;D3 is the extensional tectonic deformation,which is dominated by the northeast-north-eastward extension deformation,north The eastward ridge pattern is formed;D4 is a reversal tectonic deformation,and the tectonic inversionoccurs in the Yin'e basin and its surrounding areas,from the early extensional fault depression to the compression reentry,the development of small reverse faults and broad folds;D5 is the difference The lifting movement,the silver front basin and the adjacent area are squeezed and raised,and the fracture structure and the broad folds are locally developed.(2)The comprehensive analysis of tectonic-thermal chronology data shows that the above five-stage tectonic deformation occurred in the late Hercynian-Early Indosinian,Indosinian-Yanshanian,Yanshanian,Yanshanian and Himalayan periods.(3)The Carboniferous-Permian in the Yingliang Basin has experienced five stages of formation and evolution,namely the Carboniferous-Permian rift,the tectonic evolution stage,and the Late Permian-Triassic extrusion uplift tectonic deformation stage.,the Jurassic-Early Cretaceous intracontinental basin tectonic evolution stage,the Late Cretaceous-Paleogene tectonic reverse thrust nappe stage and the Neogene-Quaternary basin segmentation and partial fault depression stage.Its formation and evolution dynamics are closely related to the subduction and collision closure of the ancient Asian Ocean,the continuous convergence of the Siberian plate and the Tarim-North China plate,the strong activities of the deep faults such as the Altun fault zone,and the remote effects of the Indian-Eurasian plate collision.