东疆地区石炭纪—二叠纪构造古地理与原型盆地演化OACSTPCD

Carboniferous-Permian period was the key tectonic transition period in the ocean-continen-tal transition in the eastern Xinjiang region,during which multiple oceanic crust closure and continental collision occurred.Due to the complexities of ocean basin properties,trench-arc-basin subduction events and land-land collisions in the eastern Xinjiang region,there is insufficient understanding of the late Paleozoic stratigraphic framework comparison and sedimentary filling characteristics in the basin.The theory of active tectonic palaeogeography was used to restore the tectonic-sedimentary features of basin-mountain tectonic belt in the eastern Xinjiang region,and the tectonic-sedimentary environment of each tectonic stratigraphic unit was determined.The prototype basin restoration was carried out comprehensively and dynamically from the perspectives of sedimentary filling,tectonic evolution restoration and the peri-pheral tectonic environment.The results show that the eastern Xinjiang region experienced five stages of ex-tension and convergence cycles:Early Carboniferous extension,late Early Carboniferous-early Late Car-boniferous weak extension,late Late Carboniferous compression,early Early Permian extension,and late Early Permian compression.Subsequently,5 tectonic transformation processes occurred:Late Permian,Late Triassic,Late Jurassic,Late Cretaceous-Paleogene and Late Cenozoic.The reconstruction of the ba-sin-mountain tectonic pattern reveals that the southern boundary of the Tuha Basin in the Carboniferous pe-riod is approximately 46-70 km south of the present basin-mountain boundary.The Kelameili Mountains in the northern part of the eastern Junggar Basin during the Carboniferous period were approximately 30 km north of the current boundary.The northern orogenic belt of the Santanghu Basin in the Carboniferous period has a boundary of about 55 km south of the current boundary.The sedimentary environment ex-perienced a transition from the Carboniferous marine to the Early Permian marine-continental transitional phase,and then to Middle-Late Permian continental facies.During the Carboniferous period,the marine arc-related rift basins,rift marginal basins and rift basins were developed.During the early Permian,ma-rine and continental rift basins were mainly developed.During the middle Permian period,continental de-pression basins were mainly developed.During the late Permian period,compressional depression basins developed.The analysis of basin-mountain tectonic patterns and tectonic palaeogeographic evolution of the Carboniferous-Permian strata in the eastern Xinjiang region lays a good foundation for exploring the reser-voir formation conditions and source-reservoir combination distribution of the Carboniferous-Permian period in the main sedimentary basins of the eastern Xinjiang region.