Sedimentary Facies and Provenance Analysis of Upper Triassic Goulushankecuo Formation in Tuotuohe Area of Qinghai Province

Through field profile measuring, sedimentary facies signs identification, thin section authentification and grading analysis, we studied the categories and features of sedimentary facies of Upper Triassic Goulushankecuo Formation. The results show that the Goulushankecuo Formation is a Delta-Neritic shelf facies system. Based on clasolite petrographic study, the statistics from provenance analysis show that the sedarenite of Triassic Goulushankecuo Formation in workspace are mainly feldspathic litharenite and lithic quartz sandstone. Lower textural and compositional maturity indicates a rapid accumulation of sediments, which is a characteristic of nearby provenance. By detrital composition analysis, it is revealed that the provenance of Upper Triassic Goulushankecuo Formation came from recycled orogen.