土壤瞬时测氡在相山火山岩型铀矿勘查中的应用  

Application of Soil Radon Survey in the Exploration for Volcanic type Uranium Deposits in Xiangshan

作　　者：柯丹[1] 宋亮[1] 王勇[1] 赵丹[1] 吴国东[1] 

机构地区：[1]核工业北京地质研究院,中核集团铀资源勘查与评价技术重点实验室,北京100029

出　　处：《铀矿地质》2015年第A01期315-321,335,共8页Uranium Geology

摘　　要：相山铀矿田是我国重要的火山岩型铀矿基地，已知铀矿的深部及外围还具有较大的找矿潜力。在两条已知剖面上开展了瞬时测氡，分析了深部铀矿体及断裂构造上方氡气浓度分布特征。采用面积含量（CA）分形方法对测氡数据进行了异常划分，与传统的氡气晕分级方法相比，该方法在不需要对数据进行剔除的情况下，就可以圈定出与深部铀矿化信息相关的“低值异常”，同时也不会丢失原有的高值异常。土壤氡气浓度在含矿断裂上方会表现为陡峭的高衬度氡气异常，在深部隐伏铀矿体和非含矿断裂上方则主要表现为平缓的低衬度异常。Xiangshan volcanic type uranium ore field is one of the most important bases of uranium re-source in China.It has been proved by drilling that there are great potential around or beneath the existing deposits.Several geochemical techniques, such as soil radon measurement, ground gamma ray spectrum measurement,natural soil thermoluminescence and total soil method etc.are carried along two profiles where there occurs volcanic type uranium mineralization so as to evaluate the abilities and effi-cency of these methods in detecting concealed uranium mineralization information objectively.Compared with general method of anomaly delineating,the area concentration fractal technique can identify the anomalies related to deep buried uranium mineralization in low radioactive field,and at the same time there is no lose of the strong anomaly without the removal of singular data.The U ore bodies occurred in the fault zone are manifested as a strong and sharp radon anomaly with high contrast detected directly above.The U ore bodies with a distance of 100 to 200m to the fault zone are manifested as a low and gen-tle radon anomaly with low contrast.The typical response to uranium mineralization act as single or multi peak anomalies.However,there are no such significant characteristics in the results of other methods, which means that the anomalies delineated with CA fractal technique can be used in the prediction of mi neralization potential in new areas.

关 键 词：相山 隐伏矿体 氡气测量 分形 火山岩型铀矿 

分 类 号：P631[天文地球—地质矿产勘探]