Genesis Mechanism of Heat Source in Mianhuakeng Uranium Deposit,South China:Insights from Radiogenic Heat Production of Granite BodiesOA
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.
WANG Siqi;ZHANG Baojian;LÜGuosen;LIU Feng;ZHU Xi
Chinese Academy of Geological Sciences,Beijing 100037,ChinaChinese Academy of Geological Sciences,Beijing 100037,China Technology Innovation Center for Carbon Sequestration and Geological Energy Storage,Ministry of Natural Resources,Beijing 100037,ChinaInstitute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences,Shijiazhuang 050061,China China University of Geosciences,Wuhan 430074,ChinaInstitute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences,Shijiazhuang 050061,ChinaInstitute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences,Shijiazhuang 050061,China
天文与地球科学
uranium-rich graniteradiogenic heat productionheat sourcegenesis mechanismMianhuakeng uranium deposit
《Acta Geologica Sinica(English Edition)》 2026 (1)
P.286-296,11
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)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).
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