二连盆地哈达图铀矿床综合物化探特征及找矿意义

二连盆地哈达图铀矿床是我国大型可地浸砂岩型铀矿床,矿体埋深大、品位富,研究其地电化学等综合物化探特征,可为建立覆盖区航放异常有效查证技术方法提供依据.基于矿床地质及航磁航放特征的分析,开展组合物化探方法测量及特征分析.研究表明:哈达图铀矿床位于受断裂构造控制的北东向、北北东向中等磁场区及中等-弱磁场的梯度带;航空及地面...

Comprehensive geophysical and geochemical characteristics and research significance of Hadatu uranium deposit in Erlian Basin

Hadatu uranium deposit in Erlian Basin is a large-scale in-situ leachable sandstone-type uranium deposit in China. Its ore body is buried depth and rich in grade. Studying the characteristics of its comprehensive geophysical and geochemical exploration is of great significance to the establishment of an effective technical method for the verification of airborne anomalies in the coverage area and to improve the exploration effect of hidden uranium deposits. Based on the analysis of the geological, aeromagnetic and airborne radiometric features of the deposit, the combined geophysical and geochemical survey and analysis are carried out. The research shows that Hadatu uranium deposit is located in the medium magnetic field and medium-weak magnetic field gradient zone controlled by the fault structure.The U content of aerial and ground gamma energy spectrum is high on both sides and low in the middle, which is vertical to the strike of the ore body.The airborne gamma spectrum uranium content above the deposit has a higher entropy. The geoelectrochemical uranium anomaly above ore body is mainly caused by the vertical migration of nano-micron uranium mineral from deep uranium ore body to the near surface and adsorption of clay minerals in the soil. The geoelectrochemical uranium of the deposit has a saw-tooth spike anomaly on the profile, and the plane is characterized by high uranium and low molybdenum. In addition, uranium ore bodies with a buried depth of more than 300m still have geoelectrochemical anomalies.The soil radon concentration above orebody is relatively low. The combined measurement technology of geoelectrochemistry, ground gamma spectroscopy and soil radon concentration can effectively identify the cause of weak airborne information in the coverage area and its spatial relationship with deep uranium ore bodies.The comprehensive method can provide a basis for the delineation of favorable areas for concealed sandstone-type uranium deposits.