LA-ICP-MS zircon U-Pb age of gneiss from Gaoligong Mountain Group on the southeastern margin of Tengchong block in western Yunnan Province

Gaoligong gneiss from southeastern Tengchong block has experienced multi-stage metamorphism, and hence shows evident anatexis and mylonitization. 14 of the 15 zircon points yielded 206Pb/238U age of 454.4-546.7Ma, with the average age of 489Ma±16Ma. The result suggests that the Gaoligong Mountain Group in southeastern Tengchong block underwent intense regional metamorphism including migmatization in Early Paleozoic, which reflected the Pan-African event in the Tengchong block.