冀北沽源地区铀钼矿成矿规律及找矿潜力

Metallogenic Rules and Prospecting Potential of Uranium-molybdenum Deposits in Guyuan Area,Northern Hebei Province

沽源地区位于华北地台北缘内蒙地轴中段张家口火山断陷盆地西北部,属于沽源—红山子铀成矿带西段沽源成矿区。区内已发现近10处铀钼多金属矿床及矿(化)点,多为次火山热液型,主要赋存于早白垩世张家口组火山岩系中,区域断裂和火山机构附近具有多期成矿的特点。为总结沽源地区铀钼矿成矿规律以便更好地在已知矿床及外围扩大找矿潜力,通过对区内地层、构造、岩浆活动的综合分析,并类比典型矿床特征,梳理成矿规律,分析找矿潜力,总结出地层、构造及岩体与成矿关系以及该区热液改造和围岩蚀变特征。结果表明:本区成矿地质条件优越,已知矿床深部和外围具有继续寻找大—中型铀钼矿床的潜力。

The Guyuan area is located in the northwest of the Zhangjiakou volcanic fault depression basin in the middle section of the Inner Mongolia axis at the northern margin of north China,belonging to the Guyuan metallogenic zone in the western section of the Guyuan-Hongshanzi uranium metallogenic belt.Nearly 10 uranium-molybdenum polymetallic deposits and ore(chemical)points have been discovered in the area,most of which are of subvolcanic hydrothermal fluid type.It mainly occurs in the early Cretaceous Zhangjiakou Formation volcanic rock series,near regional faults and volcanic institutions,and has the characteristics of multi-stage mineralization.In order to summarize the metallogenic regularity of the urani⁃um-molybdenum ore in the Guyuan area,it is better to expand the prospecting potential in the known de⁃posits and their periphery.Through a comprehensive analysis of the stratigraphy,structure and magmatic activity in the area,and compare the characteristics of typical ore deposits,sort out the metallogenic laws,and analyze the prospecting potential,and summarize the relationship between strata,structure,rock mass and metallogenic,as well as hydrothermal reformation and wall rock alteration characteristics in this area.It is considered that the metallogenic geological conditions in this area are superior,and the deep and peripheral parts of the known deposits have the potential to continue to search for large-medium-sized ura⁃nium-molybdenum deposits.