鹿井矿田南部羊角脑铀矿床成矿时代及其地质意义  

Metallogenic Age and Geological Significance of the Yangjiaonao Uranium Deposit in the Southern Part of Lujing Ore Field

作　　者：高爽 王前林[1] 王升 欧阳平宁[1] 徐勇[1] 王凯兴 GAO Shuang;WANG Qianlin;WANG Sheng;OUYANG Pingning;XU Yong;WANG Kaixing(Research Institute No.230,CNNC,Changsha 410007,China;School of Earth Science,East China University of Technology,Nanchang 330013,China)

机构地区：[1]核工业二三〇研究所,湖南长沙410007 [2]东华理工大学地球科学学院,江西南昌330013

出　　处：《东华理工大学学报(自然科学版)》2024年第6期512-520,共9页Journal of East China University of Technology(Natural Science)

基　　金：中核集团第六批青年英才项目(中核科发[2023]384号);核能开发科研项目(地H2301);天然铀产业技术创新联合体“揭榜挂帅”科技攻关项目(202304)。

摘　　要：为探究羊角脑铀矿床的铀成矿时代及铀成矿规律,对该矿床的沥青铀矿开展电子探针U-Th-Pb化学年代学研究。结果表明,羊角脑铀矿床沥青铀矿的Ca、Si、Fe等元素含量偏低,(ω(SiO_(2))+ω(CaO)+ω(FeO))与(ω(UO_(2))+ω(PbO))、ω(PbO)无明显相关性。沥青铀矿的U-Th-Pb化学年龄为113.9~172.4 Ma,加权平均年龄为(141.6±3.2)Ma(MSWD=1.5,n=56),表明矿化时代为早白垩世。结合前人研究成果,认为鹿井矿田乃至诸广地区存在较早期的浅源低温酸性流体系统下的铀成矿事件,该事件与华南地区早期的伸展-铀成矿事件吻合,表明华南多期次铀成矿事件在诸广地区均有响应。To investigate the uranium metallogenic ages and genesis of the Yangjiaonao uranium deposit,an electron microprobe U-Th-Pb geochronological research was conducted on the pitchblende from this deposit.The results show that the contents of Ca,Si,and Fe in the pitchblende from the Yangjiaonao uranium deposit were relatively low,and there was no significant correlation between(ω(SiO_(2))+ω(CaO)+ω(FeO))and(ω(UO_(2))+ω(PbO)),as well asω(PbO).The U-Th-Pb chemical ages of the pitchblende ranged from 113.9 to 172.4 Ma,with a weighted average age of(141.6±3.2)Ma(MSWD=1.5,n=56),indicating that the mineralization occurred in the Early Cretaceous period.Combined with previous research results,it suggests that there was an earlier stage of uranium mineralization in the Lujing ore field.This event coincides with the early uranium mineralization event in South China,indicating that the multi-stage uranium mineralization events in South China have all corresponding responses in the Zhuguang area.

关 键 词：成矿年龄 沥青铀矿 诸广地区 羊角脑铀矿床 

分 类 号：P619.14[天文地球—矿床学] P597.3[天文地球—地质学]