The siliciclastic rocks of the Middle Permian Maokou Formation at Yingpan, Nayong, Guizhou, are the main object of this study, focusing on the genesis of siliciclastic rocks and the origin of defined silica using elemental earth methods.Methods: Based on the field investigation work, the ratio characteristics and enrichment patterns of major, trace and rare earth elements were analyzed by elemental geochemical methods, combined with geological background and petrographic paleogeographic features to discern the siliciclastic genesis and depositional environment.Results: Elemental geochemical correlation ratios and diagrams of diagenetic discrimination indicate that there was a significant input of hot water material during the formation process, and silicon was mainly derived from the hot water system. The depositional environment is the Qianzhong Terrace Trench in the deep- water phase of the same sedimentary fracture.Conclusions: The early submarine volcanism of the Emei mantle column or the associated hot water action provided the siliceous fraction required for the deposition of siliciclastic rocks at Yingpan, Nayong. And the early submarine volcanism of the Emei mantle column may have an important controlling role on the Permian siliciclastic sedimentation in South China.