Zircon U-Pb Age of Fengxian Acid Pyroclastic Rocks and Its Enlightenment to the Existence of Pan-African Orogeny in the West Qinling Orogenic Belt, China

1.ObjectiveThe formation of East Gondwana and its combination with West Gondwana is a result of a series of complex orogenic events,known as Pan-African orogeny.The Northern Qinling Mountain is a microcontinent that formed on the ancient oceanic crust in the northern of Yangtze craton before Neoproterozoic.It is likely that the North Qinling,