| 中国最古老铀矿床成矿年龄及铅同位素示踪铀成矿省 |
| |
| 关键词:North China Platform uranium deposit ore-forming age lead isotopic tracing |
| 基金项目:国家自然科学基金“硫酸盐中17O和18O同时测试技术及其应用”和“微量水17O和18O同时测试新技术及其在水循环研究中的应用”项目(编号:40572140,40602030) |
|
| 摘要点击次数: 2991 |
| 全文下载次数: 4734 |
| 摘要: |
| Uranium Ore-forming Ages of the Oldest Uranium Deposits in China and the Tracing of Uranium Metallogenic Provinces with Lead Isotopes |
| The oldest uranium deposits discovered in China are situated in eastern North China Platform like Anshan-Benxi area of eastern Liaoning Province,central North China Platform like Zhongtiaoshan area,and western North China Platform like Longshoushan area.Researches on 47 ore-forming ages of uranium deposits and more than 200 ore lead isotopic samples in the North China Platform suggest that the oldest uranium deposits in China were all formed about(1800±100)Ma ago in spite of their different ore-forming environments, regional conditions and geological backgrounds. Uranium mineralization in the Luliang orogenic period at the end of Early Precambrain, and the uranium deposits underwent reformation and superimposition during the Yanshannian tectonic movement. Through the calculation of μ and Th/U of original lead ore by the H-H model and a statistical analysis of average squared differences (S) ans alteration coefficients (X) of μ and Th/U in different proviences, the authors obtained both lead isotope composition by the single stage model and that of the region where obvious high anomalous lead isotopes exist. Ore lead isotope tracing suggests that eastern Liaoning area is one of the best potential uranium mineralization proviences. |
| XIA Yu-liang,HAN Jun.2008.Uranium Ore-forming Ages of the Oldest Uranium Deposits in China and the Tracing of Uranium Metallogenic Provinces with Lead Isotopes[J].Acta Geoscientica Sinica,29(6):752-760. |
| 查看全文 查看/发表评论 下载PDF阅读器 |