| There have been two general viewpoints about the formation of Qiangzhong Uplift. One is that it experi-enced stages of underwater and land uprisings. The other is that the land uprising was induced by Duyun move-ment. This research trends to agree with the former and deems that Duyun movement caused the transformation between the two uprising stages. The focus is when the underwater uprising began and when Duyun movement took place. Embryo Qianzhong Uplift formed during Early Ordovician Tongzi sedimentary stage in control of Yunan movement. By re-dating the coral fossil, such as Plasmoporella, Heliolites and Amsassia, it is affirmed that the time when the Qianzhong Uplift widely came out of sea was at the end of the Later Ordovician Wufeng sedimenta- tion, i.e. it was just the time of Duyun movement. Qiangzhong Uplift was an inheritanted old uplift that was shaped during Yunan movement, rose up during Duyun movement and incorporated during Guangxi movement. Com-pressed by unnan-Guizhou-North Vietnam land mass from south to north and Caledonian orogeny from south-east, two types of geological structures survived simutaneously in Qiangzhong Uplift and its surrounding areas. They are respectively the E-W structures represented by Qiangzhong anticline and Wudang-Erbi syncline, and theS-N structure represented by Majiang anticline. |
