The redefinition of the Nanhua System in the Delenor area in the western part of the Central Qilian and their relationship to the breakup of the Rodinia supercontinent

The volcano-sedimentary rocks of the Neoproterozoic Erathem are widely distributed in the Delenuoer area of the western segment of the Central Qilian. A new set of moraine-volcanic rocks was discovered in the 1:50000 regional geological survey. Based on the study of its petrologic and stratigraphic characteristics, it is considered to be parallel to the Nanhua System Beiyixi Formation in the Kuruktag area of Xinjiang, both of which are the products of the Nanhua Period Ice Age-volcanic event. This set of strata is redefined as the Nanhua System Shibandun Formation. From this study, it is believed that the existence of the moraine-volcanic rocks in Delenuoer of the western segment of the Central Qilian is the evidence of the Qilian Microcontinent Block responding to the splitting of the Rodinia supercontinent, which is of great significance for the study of the tectonic evolution of the Qilian Mountains in the Meso-Neoproterozoic.