A review of the research status of Caledonian movement stages in Sichuan Basin and surrounding areas

The Sichuan Basin is located at the northern margin of the upper Yangtze block. Previous studies have shown that the Caledonian movement has played an important role in controlling the lithofacies paleogeographic pattern and oil and gas distribution in the Sichuan Basin. However, there has been a great disagreement among them. Through systematic sorting and comparison of previous studies on the formation of regional tectonic movements, this article firstly divides the Caledonian movement in Sichuan Basin and surrounding areas into three stages:Yunan movement, Duyun movement and Guangxi movement and then describes the structural evolution of the Caledonian movement in South China in detail; Through comparative analysis, this article summarizes the synchronous response characteristics of the Caledonian movement in the Sichuan Basin and its periphery. Finally, based on the erosion of the strata in the central Sichuan Basin and the sedimentary environment, the tectonic evolution process of the Chuanzhong paleo-uplift is summarized. It is believed that the Chuanzhong paleo-uplift was undergoing the formation of the Xingkai fissure movement, and was transformed by the three-curtain movement of the Caledonian period, and finally shaped into a large nose-like paleo-uplift before the Permian. During this period, the Chuanzhong paleo-uplift formed multiple set of karst unconformity surfaces, which provided reference for the next exploration and deployment.