Supported by Science and Technology Project Doctoral Fund (No. 20130145120016), Central College Basic Scientific Research Business Expenses Special Funds for Outstanding Youth (No. CUGL120280), Survey Projects of Xinjiang Bureau of Land and Resources（No. XJQDZ2008-01, No. XJQDZ2008-03）.
There are large-scale intermediate-acid intrusive rocks distributed in the north of western Junggar, Xinjiang. The rocks formed during late Carboniferous to early Permian. The typical plutons include pyroxene diorite, quartz diorite and granodiorite. The Kuoyitasi intrusion is among one of them. It has SiO2 values of 52.40%-67.53%, high Al2O3 content (14.92%-17.85%) and Na content, and low K and MgO content. Rittman values (δ) of the samples vary from 1.47 to 1.98, and the FeOT/MgO values are between 1.01 and 1.69. The REE patterns are characterized by LREE enrichment and slight Eu anomalies with obvious fractionation between LREE and HREE. The geochemical characteristics suggest that the Kuoyitasi intrusion formed in a post-collisional extensional tectonic environment, and should be formed earlier than the collision time of east Junggar terrain. The rocks were probably derived from partial melting of the lower crust which was intruded by mafic magmas.
靳松,荣桂林,张兆祎,李天刚,彭朝晖,吴立昂. 新疆西准噶尔玛依勒山地区阔依塔斯杂岩体地球化学特征及锆石U-Pb年龄[J]. 中国地质, 2016, 43(1): 99-110.
JIN Song, RONG Gui-lin, ZHANG Zhao-yi, LI Tian-gang, PENG Zhao-hui, WU Li-ang. Geochemical characteristics and zircon U-Pb ages of the Kuoyitasi complex body from Mayileshan area in western Junggar, Xinjiang[J]. Geology in China, 2016, 43(1): 99-110(in Chinese with English abstract).