Timing of granite pegmatite-type high-purity quartz deposit in the Eastern Qinling,China:constraints from in-situ LA-ICP-MS trace analyses of quartz and monazite U–Pb dating  

作　　者：Yong Zhang Haibo Zhao Lei Liu Jiayong Pan Likuan Zhu Guoqi Liu Xiaotian Zhang 

机构地区：[1]State Key Laboratory of Nuclear Resources and Environment(East China University of Technology),Nanchang 330013,China [2]Zhengzhou Institute of Multipurpose Utilization of Mineral Resources,CAGS,Zhengzhou 450006,China [3]Institute of Geological Survey of East China University of Technology,Nanchang 330013,China [4]Xining Center of Natural Resources Comprehensive Survey,CGS,Xining 810000,China

出　　处：《Acta Geochimica》2022年第2期197-207,共11页地球化学学报（英文）

基　　金：the National Natural Science Foundation of China(42062006 and 41962007);the National Key Research and Development Program of China(2016YFC0600207);the Project of China Geological Survey(DD20190186 and 12120114034501);the science and technology research project of Jiangxi Provincial Department of Education(GJJ190379)。

摘　　要：Eastern Qinling,China is one of the important rare metal metallogenic provinces with extensively distributed granite pegmatite dikes.The No.5 granite pegmatite intruded into the granitic gneiss of the Qinling Group,and the major minerals are quartz(39.8%),K-feldspar(18.8%),albite(36.3%),muscovite(3.4%),and garnet(1.1%).Monazite U–Pb isotopic dating indicates that the No.5 pegmatite from the Eastern Qinling was emplaced at ca.420.2±2.2 Ma,which confirms that highpurity quartz mineralization probably formed during the Early Devonian.In-situ laser ablation inductively coupled plasma mass spectrometry analysis of quartz show that quartz samples from Eastern Qinling have total trace element concentrations(Al,Ti,Sc,Li,B,Cr,Mn,and Fe)ranging from 23.2 to 52.8 ppm,slightly higher than the quartz(impurity element content from 13.4 to 25.9 ppm)of the Spruce Pine high-purity quartz deposit in western North Carolina.The No.5 pegmatite of Eastern Qinling could be defined as one high-purity quartz deposit of China.

关 键 词：MONAZITE LA-ICP-MS U-Pb High-purity quartz Granite pegmatite Eastern Qinling 

分 类 号：P619.233[天文地球—矿床学]