Discusson on the Origin of Tuff Uraniun Ore at 6122 Uranium Deposit of the Xiangshan Uranium Mineral Field

At 6122 Deposit fourth zone of the XiangShan Uranium Mineral Field, it is thought that the main rock contained ore are dacite and mortar-lava. But the authors find the uranium ore contained in tuff. By analyzing and studying, the chlorite in uranium ore contains much more the amount of uranium, the amount of uranium reaching to 7.13%. Through the contained ore tuff characters, the relationship of mineralization and structure and mineral characters intergrowth with uranium mineral studied, the authors think that the hydrothermal ore-forming solution come from the deep earth crust section and underwent the high temperature phase ever. The mass clay mineral such as chlorite and hydro-mica formatted at the process of mineralizing alteration reduce the stability and solubility of uranyl complexion, and decompose it, and then ,reduce and precipitate uranium. At last, uranium is absorbed by such as chlorite and hydro-mica.