The Late Permian Longtan Formation in southwestern Guizhou Province is predominanted by finegrained clastic rocks of neritic facies. This sequence unconformably overlies the Middle Permian Maokou Formation. Sandstones of the Longtan Formation consist dominantly of basalticandesitic volcanic fragments with lathworkmicrolitic structures, and minor felsicvitric silicic volcanic rock fragments. The mudstones are characterized by low SiO2(28.3%~51.9%) and high TiO2(1.0%~4.1%), and have low Al2O3/TiO2 ratios (3.9~6.9), very close to that of the Emeishan basalts (2.5~5.0). Detrital zircons from the Longtan Formation finegrained sandstones show a unimodal age pattern with a peak around 260Ma, overlapping with the major eruption timing of the Emeishan large igneous province (258~263Ma). In addition, trace elements of the detrital zircons indicate its relation to magmatic activities of intraplate/anorogenic magmas. Combined with the provenance data of contemporaneous deepmarine sediments in the Youjiang Basin to the south and the terrestrial sediments to the north, our results demonstrate that the Longtan clastic rocks sourced from the Emeishan basaltic and felsic volcanic rocks. Therefore, this study reconstructed the sedimentary and paleogeographic pattern for the Late Permian Emeishan terrestrialneriticoff shoreYoujaing deepwater basin in the DianQianGui region in SW China.