河北省沽源县张麻井铀钼矿"三位一体"找矿预测地质模型

河北张麻井铀钼矿是沽源-红山子铀成矿带上典型的次火山热液型矿床。通过对矿床成矿地质体、成矿构造与成矿结构面及蚀变特征、流体包裹体和同位素特征等成矿作用特征标志的总结研究, 构建出矿区"三位一体"找矿预测模型。模型指出, 早白垩世在断裂活动条件下, 地幔源成矿热流体混合大气降水上升, 活化基底老岩体和中生代酸性岩中的U、Mo等元素, 交代沉淀形成浸染状低品位矿化; 喜马拉雅期, 成矿热液沿岩体上下盘的构造裂隙带运移沉淀, 形成脉状铀钼矿化; 脉状矿化与浸染状矿化叠加, 最终形成张麻井富铀矿体。模型的建立为成矿带取得找矿突破奠定了坚实基础。

The "trinity" prospecting prediction geological model of the Zhangmajing uranium molybdenum deposit in Guyuan County,Hebei Province

The Zhangmajing U-Mo deposit, located in the Guyuan-Hongshanzi uranium mineralization belt, is a typical sub-volcanic hydrothermal deposit. Based on the summary and study of metallogenic geological body, metallogenic structure and metallogenic structural planes, alteration characteristics, fluid inclusion and isotope characteristics of the deposit, this paper constructs a "trinity" prospecting prediction model in the mining area. The model points out that under the condition of fault activity in the Early Cretaceous, the mantle-derived metallogenic thermal fluid mixed with atmospheric precipitation rose, activated the elements such as uranium and molybdenum in the old basement rock mass and Mesozoic acid rock, and metasomatized and precipitated to form disseminated low-grade mineralization. In the Himalayan period, the ore-forming hydrothermal fluid migrated and precipitated along the structural fracture zone in the upper and lower walls of the rock mass, forming vein-type U-Mo mineralization, Vein-type mineralization and disseminated mineralization are superimposed to form Zhangmajing uranium rich ore body. The establishment of the model lays a solid foundation for the breakthrough of ore prospecting in the metallogenic belt.