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
高爽 1王前林 1王升 1欧阳平宁 1徐勇 1王凯兴2
作者信息
- 1. 核工业二三○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
- 折叠
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(SiO2)+ω(CaO)+ω(FeO))与(ω(UO2)+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.
Abstract
To investigate the uranium metallogenic ages and genesis of the Yangjiaonao uranium deposit,an elec-tron microprobe U-Th-Pb geochronological research was conducted on the pitchblende from this deposit.The re-sults show that the contents of Ca,Si,and Fe in the pitchblende from the Yangjiaonao uranium deposit were rela-tively low,and there was no significant correlation between(ω(SiO2)+ω(CaO)+ω(FeO))and(ω(UO2)+ω(PbO)),as well as ω(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 oc-curred in the Early Cretaceous period.Combined with previous research results,it suggests that there was an earli-er stage of uranium mineralization in the Lujing ore field.This event coincides with the early uranium mineraliza-tion 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Key words
metallogenic age/pitchblende/Zhuguang area/Yangjiaonao uranium deposit引用本文复制引用
出版年
2024
NETL
NSTL
万方数据