Granulometric feature and depositional environment of Cretaceous period sandstone of Fenghuoshan basin in the Hoh Xil, Qinghai-Tibet plateau

By the granulometric analysis of Cretaceous period sand stone of Fenghuo shan basin,three probability cumulative curve,that delegated three sedimentary facies,eg.delta,river and lake have been divided. Not only have important geologic significance for research Fenghuo shan basin,but also have importan tactuality significance.