GEOCHEMICAL CHARACTERISTICS AND TECTONIC ENVIRONMENT OF THE YISHIJILIKE FORMATION VOLCANIC ROCKS IN THE AWULALE AREA OF WESTERN TIANSHAN

The Yishijilike formation is a series of Upper Carboniferous bimodal volcanic formations with more alkaline and less calc-alkaline volcanic suites in the Awulale area of the West Tianshan. The rocks are rich in FeO, Hf, Th, Y, Rb, Ba, Sc, Zr, Cs, V and LREE, but poor in TiO2, MgO, P2O5, Cr and Nb. The rock association and many data and diagrams from geochemistry indicate a within plate rift tectonic environment. The volcanic rocks of the Yishijilike formation record the evolution of the tectonic environment in the Upper Carboniferous.