The Mianhuakeng uranium deposit,characterized by uranium-rich granite,serves as a key site for research into crustal radioactive heating.Based on 45 rock samples,this study reviews that the host granite in the Mianhua...The Mianhuakeng uranium deposit,characterized by uranium-rich granite,serves as a key site for research into crustal radioactive heating.Based on 45 rock samples,this study reviews that the host granite in the Mianhuakeng uranium deposit has a high radioactive heat production rate(avg.5.50μW/m³)and a low Th/U ratio(avg.2.62).Uranium-rich granite and its alteration zone within the upper crust(0-5 km depth)contribute about 45%of the total radioactive heat production,wich is crucial for controlling geothermal resource distribution.For uranium-thermal at tectonic plate margins,a symbiotic geological model was proposed:Firstly,subduction of the Pacific Plate caused upwelling of the asthenosphere,generating a high heat-flow background.Secondly,heat transfer is enhanced by major faults such as the Youdong and Mianhuakeng faults.Subsequently,uranium was mobilized,transported,and enriched within the granite through deep siliceous hydrothermal activity and associated alteration.Ultimately,the uranium enrichment in granite leads to increased radioactive heat production,resulting in local thermal anomalies.This model provides a theoretical support for exploring and developing uranium-thermal symbiotic resources in South China.展开更多
富铀矿物U-Pb体系微区原位定年技术在地球系统科学和自然资源综合地质调查中具有广泛的应用。为全面梳理其研究进展,探讨研究热点和发展趋势,本文利用CiteSpace对Web of Science核心数据库(WOS)和维普数据库(VIP)中1991—2024年期间共20...富铀矿物U-Pb体系微区原位定年技术在地球系统科学和自然资源综合地质调查中具有广泛的应用。为全面梳理其研究进展,探讨研究热点和发展趋势,本文利用CiteSpace对Web of Science核心数据库(WOS)和维普数据库(VIP)中1991—2024年期间共20469篇相关文献进行可视化分析,得到了相关知识图谱。结果表明,U-Pb微区原位定年分析领域的发展可大致分为3个阶段:起步阶段(1991—2001年)、快速发展阶段(2002—2018年)、稳定发展阶段(2019年—),主要取决于测试仪器、定年矿物拓展和数据处理软件三方面的进步。基于上述图谱分析,对U-Pb微区原位定年分析方法及其应用研究进展进行了总结,指出该领域前沿热点为不同矿物U-Pb定年的方法研发与应用拓展,下一步研究方向主要有以下几点:(1)应用飞秒激光和缩小一次离子束等技术以提高测试仪器的灵敏度、分析精度和空间分辨率;(2)研发高效的U-Pb预扫描技术并深入研究U和Pb在矿物中的赋存状态,完善低U矿物的微区原位分析方法;(3)研制不同组成不同年龄的标准物质,或建立非基体匹配方法,解决某些定年矿物标准样品稀缺的问题;(4)建立新矿物的U-Pb微区原位分析方法,尤其是沉积岩和矿床中的矿物,进一步拓展其应用领域;(5)研发基于AI的智能数据处理软件,避免数据处理过程中的主观影响。展开更多
基金supported by the National Natural Science Foundation of China(41902310,42372348,42372286)Deep Earth Probe and Mineral Resources Exploration-National Science and Technology Major Project(2024ZD1003607)+2 种基金China Geological Survey Projects(DD20230700802,DD20221819)the Basic Research Fund of the Chinese Academy of Geological Sciences(JKYQN202306)Key Research and Development Program of Shanxi Province,China(202102090301009).
文摘The Mianhuakeng uranium deposit,characterized by uranium-rich granite,serves as a key site for research into crustal radioactive heating.Based on 45 rock samples,this study reviews that the host granite in the Mianhuakeng uranium deposit has a high radioactive heat production rate(avg.5.50μW/m³)and a low Th/U ratio(avg.2.62).Uranium-rich granite and its alteration zone within the upper crust(0-5 km depth)contribute about 45%of the total radioactive heat production,wich is crucial for controlling geothermal resource distribution.For uranium-thermal at tectonic plate margins,a symbiotic geological model was proposed:Firstly,subduction of the Pacific Plate caused upwelling of the asthenosphere,generating a high heat-flow background.Secondly,heat transfer is enhanced by major faults such as the Youdong and Mianhuakeng faults.Subsequently,uranium was mobilized,transported,and enriched within the granite through deep siliceous hydrothermal activity and associated alteration.Ultimately,the uranium enrichment in granite leads to increased radioactive heat production,resulting in local thermal anomalies.This model provides a theoretical support for exploring and developing uranium-thermal symbiotic resources in South China.
文摘富铀矿物U-Pb体系微区原位定年技术在地球系统科学和自然资源综合地质调查中具有广泛的应用。为全面梳理其研究进展,探讨研究热点和发展趋势,本文利用CiteSpace对Web of Science核心数据库(WOS)和维普数据库(VIP)中1991—2024年期间共20469篇相关文献进行可视化分析,得到了相关知识图谱。结果表明,U-Pb微区原位定年分析领域的发展可大致分为3个阶段:起步阶段(1991—2001年)、快速发展阶段(2002—2018年)、稳定发展阶段(2019年—),主要取决于测试仪器、定年矿物拓展和数据处理软件三方面的进步。基于上述图谱分析,对U-Pb微区原位定年分析方法及其应用研究进展进行了总结,指出该领域前沿热点为不同矿物U-Pb定年的方法研发与应用拓展,下一步研究方向主要有以下几点:(1)应用飞秒激光和缩小一次离子束等技术以提高测试仪器的灵敏度、分析精度和空间分辨率;(2)研发高效的U-Pb预扫描技术并深入研究U和Pb在矿物中的赋存状态,完善低U矿物的微区原位分析方法;(3)研制不同组成不同年龄的标准物质,或建立非基体匹配方法,解决某些定年矿物标准样品稀缺的问题;(4)建立新矿物的U-Pb微区原位分析方法,尤其是沉积岩和矿床中的矿物,进一步拓展其应用领域;(5)研发基于AI的智能数据处理软件,避免数据处理过程中的主观影响。
