Evolution and Coal-forming Environment Analysis of Jurassic Rift Basin in Kusilafu Area, Western Kunlun

Rift basin is expanded with nearly N-S trending in Kusilafu area of Western Kunlun, which is controlled by regional Kusilafu Fault in the west. The coal of this rift basin is mainly produced in Yangye Formation and Shalitashi Formation of Jurassic Yeerqiang Group, showing the characteristics of multiple layers, thin layer and unstable elongation. Freshwater shelly beach and petrified wood stacked layers are also appeared in multiple layers, which show accumulation characteristics of coal plant's different burial places. Coal-forming environment belongs to thecontinental sedimentary environment of lacustrine and fluvial swamp. The stretching tectonic activity in Late Indo-China orogeny may be offer the impetus for the forming of coal-bearing rift basin nearby Kusilafu area.