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下庄铀矿田是我国最早发现的花岗岩型铀矿之一，研究成果丰硕，但针对不同矿床之间矿石的矿物学对比研究甚少。文章选择下庄铀矿田希望矿床和竹筒尖矿床为研究对象，利用LA-ICP-MS与EPMA原位分析技术，开展铀矿物U-Th-Pb化学定年、铀矿物和石英原位微量元素分析，探究其铀成矿时代、成矿流体性质及成矿作用。研究结果表明：与希望矿床相比，竹筒尖矿床铀矿物中REE、Th、Nb、Ta等元素相对富集，而希望矿床铀矿物中则富集W；两矿床石英均富Al，希望矿床石英具有显著的低Ti、高Li、Na、K、Rb的特征；铀矿物U-Th-Pb化学定年表明，希望矿床成矿年龄为（54.7±2.8） Ma，属于下庄铀矿田晚期铀成矿作用的产物，竹筒尖矿床成矿年龄为（121.4±3.4） Ma，属于下庄铀矿田早期铀成矿作用的产物；铀矿物和石英原位微量特征表明，希望矿床和竹筒尖矿床中的石英均为热液成因，前者形成于相对更酸性的中低温热液环境，后者形成于相对更高温的热液环境。综合分析认为，希望矿床成矿物质主要来源于赋矿的下庄岩体，而竹筒尖矿床成矿物质主要来源于赋矿的白水寨岩体，它们的形成均与区域岩石圈伸展拉张作用有关。
Abstract：Xiazhuang uranium ore field is one of the earliest granite-type uranium deposits discovered in my country,and has achieved fruitful research results,but there are few mineralogical comparative studies on ores between different deposits. This paper uses LA-ICP-MS and EPMA in-situ analysis techniques to carry out U-Th-Pb chemical dating of uranium minerals,in-situ trace element analysis of uranium minerals and quartz in Xiwang deposit and Zhutongjian deposit from Xiazhuang uranium ore field,and explores its uranium mineralization age,ore-forming fluid properties and mineralization. The uranium minerals of Zhutongjian deposit are relatively enriched in REE,Th,Nb,and Ta compared with the uranium minerals of the Xiwang deposit,while the latter is enriched in W. Quartz of the two deposits is rich in Al,and quartz of the Xiwang deposit is significantly low in Ti and high in Li,Na,K,and Rb. U-Th-Pb chemical dating of uranium minerals shows that mineralization age of Xiwang deposit is 54.7 Ma±2.8 Ma,which is the product of the late uranium mineralization of Xiazhuang uranium ore field,and mineralization age of Zhutongjian deposit is 121.4 Ma±3.4 Ma,which is the product of early uranium mineralization of Xiazhuang uranium ore field. In-situ trace characteristics of uranium minerals and quartz indicate that quartz in Xiwang deposit and Zhutongjian deposit are both hydrothermal in origin,with the former formed in a relatively more acidic medium-low temperature hydrothermal environment and the latter in a relatively higher temperature hydrothermal environment. Comprehensive analysis shows that ore-forming materials of Xiwang deposit are mainly derived from the ore-bearing Xiazhuang pluton,while the ore-forming materials of Zhutongjian deposit are mainly derived from the ore-bearing Baishuizhai intrusion,and their formation is related to the extension and tension of the regional lithosphere.
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基本信息:
中图分类号:P619.14
引用信息:
[1]曹栩,钟福军,牛佰强,等.下庄铀矿田竹筒尖矿床与希望矿床对比研究——铀矿物与石英原位微量元素证据[J].铀矿地质,2025,41(06):956-971.
基金信息:
国家自然科学基金项目（编号：42362011、42272090）; 铀资源探采与核遥感全国重点实验室基金项目（NKLURWDZC-2025-02）; 核能开发项目（编号：2301-2-5）; 中国核工业地质局地勘费项目（编号：202439-2、202439-6）; 东华理工大学核地学部“揭榜挂帅”项目（2024HDX02）联合资助