Geochemistry and Zircon U-Pb Geochronology of Early Paleozoic S-type Granites in the Eastern Qilian Block,Northwest China  

作　　者：LIU Xiuting LI Binkai HAN Jilong REN Erfeng GAO Donglin DU Yongsheng REN Qianhui ZHANG Yan 

机构地区：[1]Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining 810008,China [2]Key Laboratory of Salt Lake Geology and Environment of Qinghai Province,Qinghai Institute ofSalt Lakes,Chinese Academy of Sciences,Xining 810008,China [3]University ofChinese Academy of Sciences,Beijing 100049,China [4]College of Chemical and Pharmaceutical Engineering(Hebei),University of Science and Technology,Shijiazhuang 050018,China [5]Department of Geological Engineering,Qinghai University,Xining 810016,China [6]Department of Water Conservancy and Electric Power,Qinghai University,Xining 810016,China [7]Qinghai Province Nonferrous Metals Third Geological Exploration Institute,Xining 810012,China

出　　处：《Acta Geologica Sinica(English Edition)》2021年第2期439-458,共20页地质学报（英文版）

基　　金：financially supported by the Qinghai Science and Technology Department(Grant No.2016-ZJ752);Qinghai Salt Lake Industry(Grant No.E050DZ0801)。

摘　　要：The Qilian Block(QB)is a Precambrian micro-continent located in the northeastern Qinghai–Tibet Plateau.Prevalent Lower Paleozoic granitic magmatic rocks crop out in the QB.A new integrated study of zircon U-Pb ages and systematic whole-rock geochemical data for the Xindian,Dongjiazhuang and Xiaogaoling granites in the eastern segment of the QB constrains their emplacement ages,petrogenesis,and regional evolutionary history.U-Pb dating reveals that the Xindian granite was emplaced 454 Ma,and both the Dongjiazhuang and Xiaogaoling granites were emplaced ca.440 Ma.Geochemical study shows that all granites belong to the high-K calc-alkaline to shoshonitic series and are S-type granites formed by partial melting of continental crust,mainly metagraywacke.We infer that these ca.454–445 Ma granites formed in a syn-collisional setting during the continental collisional between the Qaidam and Qilian blocks.

关 键 词：GEOCHEMISTRY GEOCHRONOLOGY PETROGENESIS SYN-COLLISION Qilian Block NW China 

分 类 号：P534.4[天文地球—古生物学与地层学] P588.121[天文地球—地质学] P597.3