A convergent continent marginal volcanism source of ash beds near the Permian-Triassic boundary, South China: Constraints from trace elements and Hf-isotopes

XiangDong Wang1, Laishi Zhao2, Zhong-Qiang Chen1, Derong Ma2, Pingan Yan2, Fei Guo1, Fu Wang2, QingXiang Wan1 and XiaoQing Han1, (1)China University of Geosciences, Wuhan, China, (2)China University of Geosciences Wuhan, Wuhan, China