芨岭岩体马路沟断裂地球物理特征及其与铀成矿关系

Geophysical characteristics of Malugou fracture and its relationship to uranium mineralization in Jiling pluton

研究区位于芨岭岩体南带,属于龙首山铀成矿带。为了探测控矿构造马路沟断裂带在深部的发育情况,开展了音频大地电磁测量(AMT)和地面高精度磁法测量。根据物探资料,总结了芨岭岩体马路沟断裂的地球物理特征,确定了断裂的位置、产状及深部延伸情况,厘清了马路沟断裂与其次级断裂之间的关系。结果表明,马路沟断裂发育于西岔-芨岭地段北部,走向近北西,总体倾向南西,中部被北东向F_(201)断裂所错断,倾角70°左右,切割深度大于700m。在北西段倾向北东,至南东段总体倾向南西,产状具复杂多变特征。根据区域铀成矿规律及碱交代型铀矿成矿特点,预测了铀成矿有利地段,为下一步地质找矿提供了借鉴。

The study area is located in the south of Jiling pluton,Longshoushan uranium metallogenic belt.The deep extension of Malugou fracture was studied using audio magnetotelluric measurements（AMT）and ground high-precision Magnetic survey.Based on the data of Geophysics,this paper summarizes the geophysical character of Malugou fracture in Jiling pluton,and gives the position of fracture,the occurrence,and deep extension situation.And it also clarify the relationship between Malugou fracture and its secondary faults.The analysis results show that the fracture is generate in the north of the west bifurcation of Jiling pluton,the strike direction is almost the north-west,the dip direction is in south west,and it is faulted by F201 fault which is along the northeast,fault depth is 700 mand almost 70°in the dip direction.The Malugou fracture inclines to northeast in the north-western section and inclines southwest to south-eastern section of the general tendency,and the attitude is complex.According to regional uranium metallogenic regularity and alkali metasomatic uranium metallogenic characteristics,predicted the favorable uranium mineralization section.The study provides a valuable basis for the next step to geophysical prospecting.