江西宜黄县店前花岗岩型高纯石英矿独居石U-Pb同位素年龄及其地质意义  

U-Pb Isotopic Dating of Monazite and its Geological Significance in the Granite-type High-purity Quartz Deposits of Dianqian,Yihuang County,Jiangxi Province

作　　者：张思远 张勇[1] 潘家永[1] 张笑天[1] 唐春花 周渝 袁晶 钱正江 刘小龙 庞薇 ZHANG Siyuan;ZHANG Yong;PAN Jiayong;ZHANG Xiaotian;TANG Chunhua;ZHOU Yu;YUAN Jing;QIAN Zhengjiang;LIU Xiaolong;PANG Wei(State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China;Institute of Basic Geological Survey,Jiangxi Geological Survey and Exploration Institute,Nanchang 330030,China;Jiangxi Institute of Nonferrous Geology and Mineral Exploration and Development,Nanchang 330030,China)

机构地区：[1]东华理工大学核资源与环境国家重点实验室,江西南昌330013 [2]江西省地质调查勘查院基础地质调查所,江西南昌330030 [3]江西有色地质矿产勘查开发院,江西南昌330030

出　　处：《东华理工大学学报（自然科学版）》2023年第5期460-471,共12页Journal of East China University of Technology(Natural Science)

基　　金：江西省重点研发计划项目(20212BBG71003);国家自然科学基金项目(42062006);江西省地质局科技研究项目(2022JXDZKJKY02);东华理工大学研究生创新专项基金项目(DHYC-202214)。

摘　　要：高纯石英是高新技术产业不可缺少的重要功能性材料,属于我国“卡脖子”的矿物资源。对江西宜黄县店前新发现的花岗岩型高纯石英矿点调查,通过岩石学、地球化学、独居石U-Pb同位素年代学研究,获得店前高纯石英矿体(花岗伟晶岩)独居石U-Pb年龄为(412.99±0.88)Ma,表明高纯石英矿体形成于晚志留世,赋矿围岩花岗岩岩体独居石U-Pb年龄为(444.97±1.41)Ma,表明围岩形成于晚奥陶世。店前矿区花岗岩型高纯石英岩体属于过铝质S型花岗岩,源区物质来源只有下地壳。矿体内高纯石英的形成可能与发生在早古生代后期的构造-岩浆作用有关,且花岗伟晶岩与花岗岩具有同源演化的关系。本研究为深入认识高纯石英的成矿作用规律和找矿预测提供了年代学和岩石化学依据。High-purity quartz is an essential functional material in the high-tech industry and is considered a critical mineral resource in China.Through the investigation of the newly discovered granite-type high-purity quartz deposit in Dianqian,Yihuang county,Jiangxi province,the age of the high-purity quartz mineral body(granite pegmatite) in Dianqian was determined by petrology,geochemistry,and zircon U-Pb isotopic dating.The U-Pb age of granite pegmatite monazite was determined to be(412.99±0.88) Ma,indicating that the high-purity quartz mineral body was formed during the late Silurian period.The surrounding granite rocks have a monazite U-Pb age of(444.97±1.41) Ma,indicating they formed during the late Ordovician period.The granite-type high-purity quartz rocks in the Dianqian mining area are all characterized as peraluminous S-type granites,with a source material derived from the lower crust.The formation of the granitic pegmatite high-purity quartz rocks in the mining area is likely related to tectonic-magmatic activities that occurred in the late Paleozoic,and they exhibit a co-evolutionary relationship with the granites.The research provides geochronological and petrochemical evidence for a better understanding of the ore-forming mechanisms and exploration predictions of high-purity quartz.

关 键 词：岩石学 地球化学 独居石U-Pb年龄 高纯石英 店前 

分 类 号：P588.341[天文地球—岩石学]