西北地质2018，Vol.51Issue(2)：37-45,9.
内蒙古阿巴嘎旗二长花岗岩锆石U-Pb年龄确定及其构造意义
Zircon U-Pb Age of Monzonite Granite from Abag Banner in Inner Mongolia and Its Tectonic Significance
摘要
Abstract
Through detailed field investigation and test analysis,it's found that the granite in Hazhanhua area,north of Abag Banner in Inner Mongolia has the geochemical characteristics of high silicon,aluminum and alkali,but poor calcium and magnesium.It has low content of total rare earth,with relative enrichment of light rare earth and loss of heavy rare earth elements,as well as a moderate negative Eu anomaly.It riches in Rb,Th,U and othter large ion lithophile elements,but it is strongly loss in high field strength elements,such as Nb,P and Ti.The high Sr content and low Rb/Sr ratio show that the magma was sourced from strong enrichment mantle,which was formed in volcanic arc environment,displaying the characteristics of TTG rock series.The LA-ICP-MS zircon U-Pb dating shows that this monzonite granite was emplaced in Late Devonian,with an age of (367.5+1.9) Ma.关键词
构造意义/晚泥盆世/锆石U-Pb年龄/二长花岗岩/阿巴嘎旗Key words
tectonic significance/Late Devonian/zircon U-Pb age/monzonite granite/Abag Banner分类
天文与地球科学引用本文复制引用
吕达鑫,吕红杰..内蒙古阿巴嘎旗二长花岗岩锆石U-Pb年龄确定及其构造意义[J].西北地质,2018,51(2):37-45,9.基金项目
中国地质调查局“1∶5万区域地质矿产调查”(1212011220452)项目 （1212011220452）
