Abstract
Most sedimentary basins in China have undergone multi-stage tectonic evolution. This paper takes the eastern Sichuan region as the research object and relies on modern geological research methods to systematically study the basin’s dynamic characteristics and tectonic evolution process in the eastern Sichuan region. The results show that the tectonic squeezing of SW and NW from the Daba Mountain orogenic belt and the Jiangnan-Xuefeng Mountain orogenic belt, respectively, make eastern Sichuan a complex structural interference zone that is both combined and compounded. The eastern Sichuan NE and NW structural combinations The type clearly records the structural transformation effect of the two. The history of tectonic evolution since the Middle Paleozoic in the eastern Sichuan Basin is divided into five phases: the deposition of source rocks of the Wufeng Formation-Longmaxi Formation in the Caledonian Period and the parallel unconformity contact with the overlying strata caused by the end of Silurian tectonic compression; Haixi The tectonic transformation of the Early-Indochina period is mainly manifested by the inheritance of the Caledonian period, and the interaction between the Devonian-Early Carboniferous strata and the early Indosinian marine facies and terrestrial sediments is lacking, and the fold deformation in the region is weak. In the early period, a series of NE-directional faults formed mainly in the eastern Sichuan region during the NNW-SSE compression. In the late Yanshan-Early Himalayan period, the NNW-SSE ~ NWW-SEE compression became stronger than in the early Yanshan period, and the eastern NE NE-boundary faults formed. In the late Himalayan period, NE-SW was squeezed. The Wujiang fault system at the border of the southeast of Sichuan was mainly formed during this period, and the southern strata were obviously transformed by this period.
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