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《Geoscience》 2018-05
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Characteristics of Ore-forming Fluids of the Changpai Uranium Deposit in Guangdong Province

XU Hao;ZHANG Chuang;PANG Yaqing;CAO Haojie;LIU Jialin;LIU Wenquan;School of Earth Sciences and Resources,China University of Geosciences;Bureau of Geology,CNNC;Beijing Research Institute of Uranium Geology,CNNC;Research Institute No.290 of Nuclear Industry,CNNC;  
The Changpai uranium deposit is located in the Changjiang ore field in northern Guangdong Province. The uranium orebodies are controlled by the NNW trending silicified fracture zones and hosted within both the fracture zones and adjacent altered granites. Microthermometric measurements and Laser Raman Spectrum analysis indicate that the ore-forming fluids of the Changpai uranium deposit are of medium-low temperature,medium-low salinity and contain volatiles including CO_2,CH_4 and H_2. The homogenization temperatures of the ore-forming fluids range from 120 to 250 ℃ while the salinities range from 0. 4% to 10. 2%. Hydrogen and oxygen isotopic systems of quartz indicate that the ore-forming fluids are mainly derived from magmatic water in the early stage but mixed with meteoric water in the late stage. The δ~(13)C values of calcite from the mineralization stage are mostly from-9. 1‰ to-8. 2‰,signifying deep-sourced carbon in this deposit. On the basis of the aforementioned analyses,it is suggested that the Changpai uranium deposit is a medium-low temperature hydrothermal vein type uranium deposit. Fluid boiling of the ore-forming fluids and consequent escape of the volatile( e. g.,CO2) components resulted in the precipitation of pitchblende and other uranium minerals.
【Fund】: 中国地质调查局地质调查项目(20160136);; 中国核工业集团有限公司集中研发项目(LTD1602)
【CateGory Index】: P619.14
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