Geochemical Characteristics of Low to Middle Triassic Sedimentary Rocks of Eastern Kunlun Orogenic Belt

The eastern Kunlun orogenic belt shows characteristics of soft-collision and multi-cycles.The sedimentary basins inside it have multi-sources and different tectonic backgrounds. The constant elements of low to middle Triassic sedimentary rocks of the east part of eastern Kunlun orogenic belt documents that the majority of the source rocks are greywacke and others are felspar sandstones and lithogenic sandstones. This indicates that the sedimentary basin is a multi-sources turbidite flysch basin, of which the terrigenous materials come from the adjacent active continental margins, negative continental margins and volcanic arcs. The distributing model and eigenvalues of trace elements indicate that the sedimentary basin bears backgrounds of active continental margin and continental arc, more close to the active continental margin. These prove that this sedimentary basin is a flysch foreland basin developed in the continental crust.