地质与资源2017，Vol.26Issue(3)：234-244,309,12.
内蒙古济沁河林场晶洞花岗岩锆石U-Pb年龄及地球化学特征
ZIRCON U-Pb AGES AND GEOCHEMISTRY OF MIAROLITIC GRANITES IN JIQINHE LINCHANG AREA, INNER MONGOLIA
摘要
Abstract
With study on the geochemistry and zircon U-Pb isotopic geochronology of the miarolitic granites in middle Daxinganling Mountains,the age,petrogenesis and tectonic implication are discussed.The zircons from the miarolitic granites show oscillatory growth zonation and high Th/U ratios,indicating a magmatic origin.The LA-ICP-MS U-Pb age of 113.1～11.1 Ma suggests that the rock was formed in the late stage of Early Cretaceous.The granites are characterized by high SiO2and rich alkali,with negative Eu anomaly and weak peraluminous.The trace elements are enriched in Rb,Th,La,Zr and Hf and depleted in Ba,Sr,P and Ti.It is concluded that the miarolitic granites belong to highly fractionated Ⅰ-type,formed in a post-collisional extensional setting after the convergence of North China,Siberian,North American and Pacific plates.关键词
大兴安岭/晶洞花岗岩/年代学/Ⅰ型花岗岩/伸展构造/内蒙古Key words
Daxinganling Mountains/miarolitic granite/geochronology/Ⅰ-type granite/extensional tectonics/Inner Mongolia分类
天文与地球科学引用本文复制引用
吴新伟,李世超,江斌,张渝金,郭威,崔天日,李伟,司秋亮,李林川..内蒙古济沁河林场晶洞花岗岩锆石U-Pb年龄及地球化学特征[J].地质与资源,2017,26(3):234-244,309,12.基金项目
国家自然科学基金项目(41340024,41272223) （41340024,41272223）
中国地质调查局项目(1212011120664,DD20160047). （1212011120664,DD20160047）
