Geometry of the mafic dyke swarms in Emeishan large igneous province: Implications for mantle plume

d Based on regional geological information at scale of 1 : 200000 and 1 : 50000 and our field observation, we study the geometry of mafic (diabase) dyke swarms in Emeishan large igneous province (ELIP). The pattern of the dyke swarms is radiating from a centre, which is composed of six giant dyke swarms with radiate angle similar to 200 degrees. The centre is located at the Yongren area, Yunnan Province, which likely locates the centre of mantle plume head which was responsible for the Permian Emeishan flood basalt event. Our new results from the dyke swarms are consistent with the location of the maximum crust uplift inferred by previous study from stratigraphic study. There are more dyke swarms in the middle and east than west, which can plausibly be interpreted by different erosion during post-LIP event.