西北地质2018，Vol.51Issue(2)：46-56,11.
青海塔塔棱河中上游地区花岗岩地球化学和年代学研究
Geochemical and Chronological Characteristics of Early Silurian Granitic Rocks from the Upper-middle Reaches of Tataleng River in Qinghai
摘要
Abstract
The granitic rocks from the Upper-middle Reaches of Tataleng River in Qinghai are mainly porphyritic monzonitic granite,monzonitic granite,granitic porphyry and porphyritic syengranite,which are syengranite,rapakiwi granite,granodiorite porphyry and quartz diorite.Geochemical study of these granitic rocks indicate that they are characterized by peraluminous (A/ CNK =1.10～1.26) and high-K (K2O ＞ Na2O),belonging to calc-alkaline series (σ=1.22～ 2.22) and S-type granite.LA-MC-ICP-MS zircon U-Pb results show that their ages are 440.4 + 1.4Ma.Tectonie setting discrimination diagram suggests that these granitic rocks were formed in post-collision tectonic environment.The comprenensive analysis indicates that the Early Silurian granite was formed by the partial melting of continental crust that caused by the extrusion of South Qilian block,when the South Qilian block was subducted and collided with the Quanji block in the continent-continent convergence stage.关键词
柴北缘/早志留世/花岗岩/地球化学Key words
North Qaidam/Early Silurian/granite/geochemistry分类
天文与地球科学引用本文复制引用
付彦文,余福承,逯永卓,田永革..青海塔塔棱河中上游地区花岗岩地球化学和年代学研究[J].西北地质,2018,51(2):46-56,11.基金项目
中国地质调查局“青海1∶5万大头羊煤矿、超力本陶勒盖、绿草山煤矿、耳温乌兰、红铁沟5幅区调”(1212010040111)项目 （1212010040111）
