Objective The Emeishan Large Igneous Province(LIP)is considered to represent a major Later Permian basaltic magmatism in the western margin of the Yangtze Block in South China.Previous geochronological studies on mafic intrusion and felsic ignimbrite have assigned an eruption age of 259-263Ma for the Emeishan LIP (Zhong et al.,2010),accompanied by regional domal uplift (Mabi Awei et al.,2017).The Xuanwei Formation was formed after the termination of the Emeishan flood basalt volcanism.The uppermost silicic members in the center of the LIP were eroded first and the "felsic"materials were transported and deposited in the eastern LIP,forming the lowermost part of the Xuanwei Formation.
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