pXRF原位分析在柴北缘鱼卡金红石矿床勘查中的应用

便携式X射线荧光分析(pXRF)具有快速、高效、绿色、便捷等优点, 在矿产勘查中的应用越来越广泛。样品的不平度效应和不均匀效应等问题, 使得pXRF现场原位分析结果与实验室分析结果存在一定偏差。将该技术运用于柴北缘鱼卡金红石矿床勘查找矿, 对pXRF原位分析的稳定性进行试验, 并与实验室XRF法测试结果进行对比分析。结果表明, pXRF原位分析单点重复测量结果稳定, 分析测试最优时间为25~30 s; pXRF和实验室XRF法对样品Ti含量具有显著相关性, 存在线性关系。野外快速分析, 评价榴辉岩的Ti含量, 结果表明, 当pXRF原位分析榴辉岩中Ti含量在0~0.52%时, 对应非矿化榴辉岩; Ti含量在0.52%~0.86%时, 对应金红石贫矿体; Ti含量大于0.86%时, 对应的榴辉岩为金红石工业矿体。在槽探编录和钻探施工过程中, 使用pXRF分析可在野外快速判断榴辉岩的含矿性, 辅助找矿工作中圈定矿体, 大大减少样品采集的工作量, 节约成本和时间, 提高对榴辉岩型金红石矿床的勘查效率。

Application of pXRF in-situ analysis in the exploration of Yuka rutile deposit,North Qaidam

Portable X-ray fluorescence analysis (pXRF) has the advantages of being fast, efficient, green, and convenient, making it increasingly widely used in mineral exploration. However, due to issues such as unevenness and non-uniformity in the samples, there is a certain deviation between the in-situ analysis results of pXRF and the laboratory analysis results. In this paper, the stability of pXRF in-situ analysis is tested and compared with the results of the laboratory XRF method, and this technology is applied to the exploration and prospecting of Yuqa rutile deposits in North Qaidam. The stability test shows that the single point repeated measurement result of pXRF in-situ analysis arestable, and the optimal time of analysis and testing is 25~30 seconds.There is a significant correlation between pXRF and laboratory XRF method for Ti content in the sample, with a linear relationship. The results of field rapid evaluation of Ti content in eclogite show that when the Ti content of ineclogite is in the range of 0~0.52% by in situ pXRF analysis, it corresponds to non-mineralized eclogite. When the Ti content is in the range of 0.52%~0.86%, it corresponds to low-Ti ore body.When the Ti content is greater than 0.86%, the corresponding eclogiteisa rutile industrial ore body.In the process of trenching logging and drilling construction, the use of pXRF analysis can be quickly determine the ore bearing property of eclogite in the field, which can help to delineate the ore bodies in the prospecting work, greatly reduce the workload of sample collection, save cost and time, and improve the exploration efficiency of eclogite-type rutile deposits.