伊犁盆地南缘局部排泄源对铀成矿的影响  

Effect of Local Discharge Sources in the Southern Yili Basin on Uranium Mineralization

作　　者：逄玮 康勇[1] 王冰[1] 

机构地区：[1]核工业二一六大队,新疆乌鲁木齐830011

出　　处：《东华理工大学学报（自然科学版）》2016年第3期253-258,共6页Journal of East China University of Technology(Natural Science)

基　　金：中国地质调查局项目"新疆伊犁盆地南缘可地浸砂岩型铀矿远景调查"(1212011220775)

摘　　要：局部排泄源是地下水的局部泄水天窗,其成因大致可分为两类,一类是产生于构造动力的泄水天窗,另一类是由承压含水层顶、底板隔水层沉积缺失而引起的泄水天窗。在分析区域地质背景的基础上,结合遥感影像资料,分析了研究区因构造动力而产生的局部排泄源的分布特征。分析了局部排泄源对水动力条件、层间氧化带、铀矿体的空间定位关系等的影响。局部排泄源缩短了地下水的径流距离,对铀成矿有利。研究区隐伏性承压层间水排泄源对层间氧化带、地下水水文地球化学特征及矿体的定位均产生了较大的影响。构造动力成因的局部排泄源本身就是一把双刃剑,它既能助推铀矿带发育形成,也会对已形成的古矿床造成毁灭性的破坏。Local discharge source is the drainage skylight of groundwater. The causes can be roughly divided into two categories, one kind of drainage skylight is produced in the tectonic dynamics , another kind is caused by sedimentary gap of the top or bottom of the confined aquifer. Based on the analysis of regional geological background, combined with the remote sensing image data. Analyzes the distribution characteristics of the local discharge source generated by the tectonic dynamics. The effects of local discharge source on hydrodynamic condition, inter- layer oxidation zone and the orientation of uranium ore body. Local discharge source shortens the runoff distance of groundwater, which is favorable for uranium mineralization. In the study area, the buried water discharge of confined water between layers has a great influence on the interlayer oxidation zone, the geochemical characteristics of the groundwater and the orientation of the ore body. Local discharge source caused by tectonic dynamics is a double - edged sword. It can promote the formation of uranium ore belt, and can also cause devastating damage to the ancient deposits has been formed.

关 键 词：伊犁盆地南缘 局部排泄源 成矿年龄 隐伏断裂 

分 类 号：P612[天文地球—矿床学] P548[天文地球—地质学]