International Symposium on Uranium Raw Material for the Nuclear Fuel Cycle: Exploration, Mining, Production, Supply and Demand, Economics and Environmental Issues (URAM-2018)

Structural Characteristics and Its Control on Uranium Mineralization in Xiangshan Uranium Ore-Field

26 Jun 2018, 09:00

20m

Vienna

ORAL Track 3. Applied geology and geometallurgy of uranium and associated metals Applied Geology and Geometallurgy of Uranium and Associated Metals

Speakers

Mr Jiangtao Nie (Beijing Research Institute of Uranium Geology)Dr Ziying Li (Beijing Research Institute of Uranium geology)

Description

Xiangshan uranium ore-field is the largest volcanic-related hydrothermal uranium deposit in China. Based on high precision deep geophysical survey, 3D geologic modeling and scientific drilling projects, EW-trending faults in basement were rejuvenated by strong shearing of Suichuan-Dexing fault during later Jurassic to Early Cretaceous, the tectonic-stress field changed from compression to extension at the beginning of Early-Cretaceous, and it is advantageous to the ascension of deep-derived materials, with ore-bearing hydrothermal fluid transiting, precipitating and enriching. The favorable position for uranium mineralization include the junctions of faults with different directions, the junctions between main faults and subsidiary fractures, the junctions between branch fractures of main faults and derived fractures of subsidiary faults. EW-trending faults in basement is the main channel-way in which substance can transmit to surface, the linear, ringlike and radial pattern structures which are connect with faults in basement controlled the shape, occurrence, scale and spatial locations of uranium ore bodies, these faults are main ore-hosting structures. Therefore, we hold fault structures are still the emphasis of ore-finding, especially, the belts where deep E-W faults and surface faults intersected are favorable areas to explore uranium resources.