Petrologic and geochemical constraints on the petrogenesis of Permian–Triassic Emeishan flood basalts in southwestern China

The Emeishan flood basalt is a large igneous province erupted during the Permian–Triassic period in southwestern China. Based on petrographic, major and trace element, and Sr–Nd isotope data, the Emeishan basalts can be classified into two major magma types. These are: (1) a low-Ti (LT) type that exhibits low Ti/Y (<500), Fe2O3* (<12%), Nb/La (0.6–1.4), εNd(t) (−4.8 to +1.4) and relatively high SiO2 (48–53%) and Mg# (0.52–0.64); (2) a high-Ti...