江西相山矿田乐家测区地电提取异常特征及找矿预测

Characteristics of Geo-electric Extraction Anomalies and Prospecting Prediction in Lejia Survey Area,Xiangshan Orefield,Jiangxi Province

相山是我国重要的铀矿资源储备基地,但其中部地区因火山盆地的基底深度大而未取得找矿进展。为了构建大深度铀矿探测技术体系,发展地球化学勘查的深部找矿技术,选择乐家测区作为研究区,在相山中部地区开展了地电提取测量法找矿预测工作。研究表明:U、Th、Mo等元素异常反映了主要成矿作用,而U、Th元素的背景值变化主要受基底深度控制,呈NW向带状分布,与物探AMT推测结果较吻合;Pb、As、Sb元素可能反映了酸性岩浆和热液作用。以上特征说明各元素的空间分布特征与相山火山盆地结构、铀矿化密切相关,地电提取测量能较好地反映研究区地质条件和成矿规律,可以为深部找矿提供较为可靠的信息。根据上述分析,圈定了杏树下、上家岭、乐家北东侧等3处找矿远景区,其中杏树下远景最好。

Xiangshan is an important uranium reserve base in China,but no progress has been made in prospecting in the middle part of Xiangshan because of the deep basement of the volcanic basin.In order to build the technical system of deep uranium exploration and develop the deep prospecting technology of geochemical exploration,Lejia survey area was selected as the study area,and the prediction work of geo-electric extraction survey method was carried out in the central area of Xiangshan.The results show that the spatial distribution characteristics of elements are closely related to the structure of Xiangshan volcanic basin and uranium mineralization.The anomalies of U,Th,Mo reflect the main mineralization,and the background values of U and Th are mainly controlled by the depth of the basement,showing a NW zonal distribution,which is consistent with the results inferred by geophysical exploration methord of AMT.The anomalies of Pb,As,and Sb may reflect acidic magma and hydrothermal activity.The above characteristics show that the spatial distribution characteristics of each element are closely related to the structure of Xiangshan volcanic basin and uranium mineralization.Geo-electric extraction survey can better reflect the geological conditions and metallogenic laws of the study area,and can provide more reliable information for deep ore prospecting.Based on the above analysis results,three prospecting prospect areas were delineated,including Xingshuxia,Shangjialing,and the NE side of Lejia,and among these areas,Xingshuxia is the best.