鄂东南某铀矿勘查区地气与X荧光异常特征及找矿意义

摘要

We have carried out concealed uranium ore prospecting by geogas and soil X-ray fluorescence (geochemistry) measurements in the exploration area of uranium deposits in southeastern Hubei Province. Measurements of the known uranium mining areas show that uranium occurs in the primary and secondary fractures. Above the ore fractures and along the direction extended from the fracture in the adjacent area, forms the geogas and soil geochemical anomaly area of uranium. In the abnormal zone, Pb, Zn, Cu, Au in the geogas show anomalies, but also show obvious difference. The anomalies are accompanied by low amplitude anomalies in W, Bi, Y, Mo, Mn, As and so on. According to the comprehensive analyses of exploration area with geogas and soil X-ray fluorescence data, the northwest part of the surveyed area north of the secondary fracture F7 captured all the characteristics of geogas and soil with known ore anomaly. According to the relationship between abnormal position of geogas and fracture, uranium may be buried at the depth of 200~350 m, on to the ore body, extending 220 m along the strike. At present, uranium ore bodies have been confirmed in the abnormal area in a borehole at 200 m depth. Further exploration engineering work is in progress.%采用地气与土壤X荧光（地球化学）测量法，对鄂东南某铀矿勘查区开展隐伏铀矿找矿工作，结果表明铀矿赋存在工作区主断裂和次级断裂中，在含矿断裂上方及断裂延伸方向的相邻区域形成含U的地气与土壤地球化学异常区。异常区内Pb，Zn，Cu，Au的地气异常明显且具有一定的差异，同时伴有幅度较低的W，Bi，Y，Mo，Mn，As等元素组合异常。根据勘查区获得的地气与土壤X荧光资料综合分析，在测区西北的次级断裂F7北部捕获的地气与土壤异常具有已知矿异常的全部特征。依据地气异常位置与断裂的关系，推断铀矿可能埋深在200~350 m左右，矿体在走向上可能有220 m的延续。目前，在该异常区布设的钻孔已在200 m深度见到铀矿体，进一步的探矿工程还在进行中。