华南西南地区分布有大面积的晚二叠世陆源碎屑沉积序列，覆盖在峨眉山玄武岩或中二叠世碳酸盐岩地层之上，代表了以峨眉山火山岩为源区的源-汇沉积体系，是峨眉山大火成岩省在晚二叠世大规模剥蚀的地质记录，为理解峨眉山大火成岩省晚期火山活动提供了宝贵研究素材。本项目拟以黔西北-黔西南-桂西北地区北东向的晚二叠世陆相-滨海相-深水海盆相陆源碎屑沉积体系为研究对象，通过详细的沉积学分析，运用砂岩碎屑组分、全岩和火山岩岩屑地球化学、磷灰石Sr同位素及化学组成、碎屑锆石U-Pb年代学及微量元素组成分析，配合峨眉山凝灰质火山岩的全岩和单矿物组成分析，揭示该碎屑沉积体系的环境构成和沉积演化，理解沉积体系内碎屑沉积物组成的时空变化趋势及可能的沉积控制机制，重建峨眉山大火成岩省晚二叠世剥蚀的火山岩岩石组成及属性，探讨峨眉山大火成岩省晚期酸性火山活动的规模和岩浆的形成演化过程。

There developed large-area terrigenous clastic sedimentary sequences during the Late Permian, overlying the ~260 Ma Emeishan basalts or Middle Permian carbonate-dominated strata, in the SW South China. These clastic sedimentary rocks are formed in a unique source-to-sink sedimentary system with detritus primarily derived from the Emeishan large igneous province, represent the geological records of the late Permian massive erosion of the Emeishan large igneous province and provide a chance to understand the late-stage silicic volcanism in the Emeishan large igneous province. This study will focus on the southeastward terrestrial-littoral-deep water basinal terrigenous clastic sedimentary system in the NW Guizhou-SW Guizhou-NW Guangxi region. Based on detailed sedimentology analysis and using sandstone modal composition, bulk rock and volcanic lithic fragment geochemistry, detrital apatite Sr isotopic and chemical composition, and detrital zircon U-Pb geochronology and trace element geochemistry, in combination with bulk rock and single mineral analysis from Emeishan volcanic tuffs, this study tends to document the configuration of facies and depositional evolution of this Late Permian terrigenous clastic sedimentary system, reveal the temporal and spatial trends of detrital sediment composition and the potential controls related to sedimentary processes within this sedimentary system, document the composition and nature of volcanic rocks eroded from the Emeishan large igneous province during the Late Permian, and reveal the potential volume and related magmatic evolution of the late-stage silicic volcanism in the Emeishan large igneous province.