The oxidation-infiltration zone features and controlling conditions in No.199 hydrothermal uranium deposit

The author presents the features of geological metallogenesis in uranium deposit of No. 199. The author has done research work on the alteration of country rock, the ore fabrics, the mineral paragenesis, geochemical feature, the occurrence of uranium and so on, and concluded that the mentioned uranium deposit belongs to hydrothermal uranium deposit amd later suffered from oxidation-infiltration. The uranium source of hydrothermal metallogenesis is mainly from the uranium-rich volcanic residual magma and hydrothermal fluid in late Yanshanian Period. Uranium is moved in the form of carbonic acid uranyl, the mineralization temperature of the uranium deposit is from 280 deg C to 340 deg C, the ore forming solution is weak acidity (PH = 5.33 ∼ 5.56), the fault of existing mineral is of the spreading characteristic, uranium source of infiltration concentration is from hydrothermal uranium mineralization, uranium exists in the form of secondary uranium minerals and adsorption, and is controlled by products of squeeze fracture--clay minerals and superficial minerals