The response of Mayuan, Nanzheng- Yangpingguan, Ningqiang sedimentary basin on the northern edge of the Yangtze platform to tectonic events and sea level changes

Abstract：A group of early Paleozoic-Mesozoic carbonate rocks intercalated with clastic rocks with clear structure and lithofacies was deposited in Nanzheng-Yangpingguan Paleozoic sedimentary basin of south Qinling Mountains, lying at the northern passive edge of Yangtze Platform. On the basis of stratigraphic features and lateral change, 6 sequences as well as some depositional boundaries and tracts were recognized. The evolution of the sedimentary basin was closely related to tectonic regime and regional tectonic movement, and the tectonic movements dominated the sea-level change. In recent years, “Mayuan-type” lead-zinc metallogenic belt hundreds of kilometers in thickness was discovered in Sinian Dengying dolomite of Mayuan and Nanzheng. Therefore, it is of great significance to study the regional tectonic history, restore sea-level change and understand the regional sensitive sea-level changes through the analysis of the regional stratigraphic framework and sequence stratigraphy with the purpose of forecasting the mineral deposits better.