Geochemical Characteristics and Zircon U-Pb Ages of the Kuoyitasi Complex Body from Mayileshan Region in Western Juggar,Xinjiang
There are large-scale intermediate-acid intrusive rocks distributed in the north of western Junggar, Xinjiang Province.The rocks formed during late carboniferous to early Permian.The typical plutons include pyroxene diorite, quartz diorite and quartz monzomtic diorite.The Kuoyitasi intrusion is among one of them, with SiO2 contents of 52.40%-67.53%, high Al2O3 content (14.92%-17.85%) and Na contents, low K and MgO contents.Rittman values (5) of the samples vary from 1.47 to 1.98, 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 earlier than the collision time of east Junggar terran.The rocks were probably derived from partial melting of the lower crust which has been intruded by mafic magmas.
Western Junggar Carboniferous post-collision petrogenesis LA-ICPMS U-Pb dating
JIN Song RONG Guilin ZHANG Zhaoyi
Faculty of Earth Science,State Key Laboratory of Geological Processes and Mineral Resources,China Un Hebei Institute of Geological Survey,Shijiazhuang,Hebei 050081,China
国际会议
第十八届凯洛林国际地质学术研讨会(The 18th Kerulien International Conference on Geological)
石家庄
英文
117-127
2013-09-20（万方平台首次上网日期，不代表论文的发表时间）