| 康春晖,谭凯旋,刘江,谭婉玉,谢焱石,韩世礼,段先哲.应用锆石研究铀成矿流体的地球化学特征:以粤北棉花坑铀矿床为例[J].南华大学学报(自然科学版),2019,33(4):19~26.[KANG Chunhui,TAN Kaixuan,LIU Jiang,TAN Wanyu,XIE Yanshi,HAN Shili,DAUN Xianzhe.Constraints of Uranium Ore-forming Fluids from Geochemical Characteristics of Zircon:an Example from Mianhuakeng U deposits in North Guangdong Province,China[J].Journal of University of South China(Science and Technology),2019,33(4):19~26.] |
| 应用锆石研究铀成矿流体的地球化学特征:以粤北棉花坑铀矿床为例 |
| Constraints of Uranium Ore-forming Fluids from Geochemical Characteristics of Zircon:an Example from Mianhuakeng U deposits in North Guangdong Province,China |
| 投稿时间：2019-04-16 |
| DOI： |
| 中文关键词: 锆石 成矿流体 微量元素 稀土元素 粤北棉花坑铀矿 |
| 英文关键词:Zircon ore-forming fluids trace element Rare earth elements(REE) Mianhuakeng granitic uranium deposit |
| 基金项目:国防基础科研计划项目(B3720110004) |
|
| 摘要点击次数: 938 |
| 全文下载次数: 677 |
| 中文摘要: |
| 铀矿中锆石富集Li、P、Ti、Nb、Hf、U、Th、Ta、Y、Rare earth elements(REE)等微量元素,Th/U比值较低,在以大陆上地壳为标准化的模式图上呈现明显的重稀土富集、Ce、Y正异常和Eu负异常的特征。根据锆石/热液间微量元素的分配系数估算了成矿流体的微量元素质量分数。铀成矿流体具有富U,低Th/U比值,高稀土元素质量分数,轻、重稀土分异不明显,显著的Ce、Eu负异常和Y正异常,低Ce4+/Ce3+比值等特征。成矿流体主要来源于岩浆期后热液,并得到流体/岩石反应的改造,流体上升减压导致流体沸腾、气体溢出、碱性增高和还原环境,最终导致铀矿物的沉淀和铀矿床的形成。 |
| 英文摘要: |
| Zircons in uranium ore deposit studied are enriched in trace elements(exempli gratia:Li,P,Ti,Nb,Hf,U,Th,Ta,Y,Rare earth elements(REE)),but have low Th/U ratios.In addition,in the model diagrams of the trace elements normalized by the upper continental crust,the zircons show obvious enrichment of heavy rare earth elements,positive anomalies of Ce and Y,and negative anomaly of Eu.Based on the distribution coefficients of trace elements between zircon and hydrothermal solutions,the contents of trace elements in metallogenic fluids were estimated.The uranium metallogenic fluids have the characteristics,such as high U contents,low Th/U ratios,high rare earth element contents,insignificant differentiation of low and heavy rare earth elements,significant Ce and Eu negative anomalies,and Y positive anomalies,as well as low Ce4+/Ce3+ ratios.The metallogenic fluids are mainly derived from the post-magmatic hydrothermal solutions,modified by fluid/rock reaction.The fluid rise and decompression leads to fluid boiling,gas overflow,increase in alkaline contents,and reduction environment,consequently resulting in the precipitation of uranium ore minerals and the formation of uranium ore deposits. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|