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《JOURNAL OF CHENGDU UNIVERSITY OF TECHNOLOGY》 1994-01
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THE HYDROTHERMAL GEOCHEMICAL FEATURES AND PHYSICOCHEMICAL CONDITIONS OF URANIUM DEPOSIT 361

Liu Alping;Jin Jingfu  
in this paper, the hydrothermal geochemical features have been studied in detail, and the simulated calculations of thermodynamics have been made. It is believed that the hydrothermal of the deposit was the mix of the precipitation and the hypothermal fluid. The hypothermal fluid was the same source as the basic dike rock. It was the volatile fluid containing Na+,Cl-,CO2 etc. It rised along the abyssal fault,heated and mixed the precipitation in the crustal derm. During the mixed hydrothermalsolution circulated, the active uranium was drived from granite, and migrated to the broken position near the fracture,and concentrated in the deposit. The proportion of the hypothermal fluid to the oreforming hydrothermal was little,but it provided the hydrothermal with the thermal energy and the protion of the mineralize agent. Uranium in hydrothermal solution was existed in the form of (UO2 (CO3 )3)4-, [UO2 (CO3 )2·2H2O2]-, [UO2]2+,etc. The mineralization mainly was the dissipationof the gaseous composition (CO2 etc. )in the hydrothermal solution, which result in these complex ions dissociating quickly. Meanwhile. in the process of ore-forming hydrothermal evolution, temperature and oxide fugacity gradually dropped,and PH changed gradually from strong alkalinity to neutrality. These factors mineralired uranium also.
【CateGory Index】: P619.140.1
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