Comprehensive information prospecting model for sandstone uranium deposits in Teguida area, Niger
SUN Dong-Hua1,2, JIANG Ming-Zhong1,2, LUO Yan1,2, JIANG Xue1,2, GU Da-Zhao3,4
1. Airborne Survey and Remote Sensing Center of Nuclear Industry, Shijiazhuang 050002, China;
2. Key Laboratory of Uranium Resources Geophysical Exploration Technology, China Nuclear Industry Group Company, Shijiazhuang 050002, China;
3. Beijing Research Institute of Uranium Geology, Beijing 100029, China;
4. Key Laboratory of Uranium Resources Exploration and Evaluation Technology, China Nuclear Industry Group Company , Beijing 100029, China
Through the investigation of integrated anomalies in known deposits in Teguida, a predictive model for sandstone uranium mineralization was established, which helps to discover buried orebodies. Based on the analysis of geological anomaly, it is concluded that the uranium mineralization lies in Lower Cretaceous Assaousas Formation, controlled by regional faults, and occurs along the edge of the upper Paleozoic uplift. It is also pointed out that the different depths of the orebody have different characteristics of geophysical field, but generally show the phenomenon that uranium anomalies are detected by vehicle or ground gamma spectral survey, radon anomalies detected by activated carbon adsorption of radon, and high value anomalies detected by soil-natural themoluminescence. According to audio frequency magnetelluric sounding, the orebodies are located in the transitional part from low to middle resistivity and close to the middle resistivity. On such a basis, five uranium prospecting targets were predicted, in two of which uranium mineralization (clue) was discovered by the later exploration.
