下庄矿区铀成矿条件及找矿新思路

Metallogenic condition and new prospecting direction for Xiazhuang uranium mine area

下庄矿区是下庄铀矿田内的老勘探区,前人在该区的主构造带——下庄断裂带深部取得了较好的找矿成果。近年来,对该区进行地表工作及深部钻探研究,有了新的发现:(1)下庄断裂带下盘存在一组与该带走向大致平行,倾向相反,缓倾斜的断裂构造,并且在其中见到新的铀矿化类型和较好的工业矿体;(2)在下庄河沉积覆盖区域找到了隐伏的辉绿岩及硅化断裂构造,为寻找隐伏的"交点型"铀矿提供了依据;(3)在山下村后山402号带、404号带和406号带等深部发现了新的富铀矿体。这些新的发现表明,今后该区的铀矿勘查工作应充分重视平缓的断裂构造组、隐伏辉绿岩以及深部"交点",它们与铀矿富矿体存在密切关系。这也为下庄矿田南部新一轮铀矿勘查工作开辟了新的思路。

Xiazhuang mine area is an old prospecting area in the ore-field,and significant exloration result have already obtained by predecessors in the deep part of the major structure of Xiazhuang fault,recent research on the surface and borehole data have result in some new discovery：（1）Slight dip faults in the footwall rocks which have nearly the same strike but reverse dip to the major fault and bear new types of mineralization and fairlly rich orebobies;（2）Concealed diabase dyke and silicified fractures in Xiazhuanghe area which provides evidence for seeking concealed＂intersection-type＂uranium miner-alization;（3）New rich orebody within zone 402,zone 404 and zone 406 in Shanxia village.All the discoveries and findings suggest that in future uranium exploration more attention should be paid to the slight dip structure,underlying diabase and deep＂intersection＂,because they have close genetic relationship with uranium mineralization.