深部元素地气迁移的分量化探证据：以郴州金狮岭铀多金属矿床为例

以地气理论为基础的分量化探技术被广泛应用于深部隐伏矿床勘查。深部矿体信息随地气迁移到地表形成叠加异常，分量化探技术可用于采集分析这部分信息来推测深部矿体的赋存状态。以位于湖南省郴州市的金狮岭铀多金属矿床为研究对象，在早期钻探工作、伽马能谱和氡浓度测量成果的基础上，利用分量化探技术探求深部元素地气迁移的证据，为进一步寻找深部隐伏矿床提供理论基础。在该矿区选定了氡浓度异常明显的3条采样线，对采自深度为40~60 cm的浅层土壤147件样品中的U、Pb、Zn等20个元素进行了分量提取和ICP-MS分析，并对分析数据进行了U分量异常特征分析、相关分析、聚类分析，U分量异常地质综合剖面分析以及土壤U分量与伽马能谱U含量的对比分析解译。结果表明：①区内3#、8#测线U分量异常明显，最大值分别为2 194 ng/g和2 167 ng/g，异常衬度值分别为1.298和1.403，区内具有良好的铀矿找矿潜力；②与U分量密切相关的元素为Nd、Sm、Ta，相关系数分别达到0.465，0.492和0.491，远高于99%置信度的临界值0.217，显示其随着地气迁移过程中与U密切相关；③U分量异常主要与深部隐伏矿体、断裂破碎带有关，U分量曲线与Nd、Sm、Ta分量曲线高度吻合，U、Nd、Sm、Ta分量异常组合可作为该区指示深部铀矿体的地球化学标志。

Evidence for Partial Content Geochemical Exploration Method of Deep Elemental Gas Migration: a Case Study of Jinshiling Uranium Polymetallic Deposit in Chenzhou City

Geochemical exploration of the partial contents of the elements based on the geogas theory is widely used in the exploration of deep concealed deposits.The information of the deep ore body is migrated to the surface to form a superposition anomaly，and the geochemical exploration of the partial contents can be used to collect and analyze the anomaly to estimate the occurrence of the deep ore body.Based on the results of drilling，gamma spectroscopy and radon concentration，the geochemical exploration of partial content technique is used to discovery the evidence of deep elemental the geothgas migration，which can provide a theoretical basis for further searching for deeply concealed deposits.Taking Jinshiling uranium polymetallic deposit as the study example，three sampling lines with abnormal radon concentrations in the mining area is selected，and the component extraction and ICP-MS analysis of the 20 elements such as U， Pb， Zn etc. from 147 samples of the shallow soil with depths of 40~60 cm is carried out.Based on the above test results，anomaly characteristics analysis，correlation analysis cluster analysis of U component are conducted，and the comparative analysis and interpretation of U component in the geologic synthesis section，U component in the soil and U content in gamma energy spectrum are done.The results show that:① U component of the 3# and 8# lines in the area is obviously abnormal，the maximum values are 2 194 ng/g and 2 167 ng/g，and the abnormal contrast values are 1.298 and 1.403，the prospect of uranium prospecting in the area is good；②the elements are closely related to U partial content are Nd，Sm and Ta，whose correlation coefficients are 0.465，0.492，0.491 respectively，which are much higher than the critical value （i.e.， 0.217） with 99% confidence，demonstrating that it is closely related to U during the gas migration process；③the U partial content anomaly is mainly related to the deep concealed ore body and fracture fracture zone，and the U partial content curve is highly consistent with the Nd，Sm and Ta component curves，which suggests that the U，Nd， Sm and Ta component abnormal combination can be used as a geochemical tracer for the deep uranium ore body in this area.