土壤测量样品处理方法对金异常圈定的影响与应用——以湘东北棉花坡矿区为例

在地质勘探的普查和详查工作中,土壤地球化学的指示作用是重要的决定性因素之一。随着地表及浅部矿产的开发,边深部盲矿体的找矿难度不断加大。按照目前的样品处理方法及技术要求,岩金矿区的矿化地段土壤测量分析数据被削弱,元素异常下限值偏低。为了解决异常贫化带来的异常圈定问题,本次研究对土壤样品的加工进行改进和调整。首次提出将野外采取的金矿土壤测量样细分,烘干处理后,不再进行过筛处理,并在湘东北醴陵市棉花坡金矿区的找矿普查工作中应用。对该区金矿土壤测量样品野外加工过筛与不过筛检测结果对比分析,未过筛样品能更客观、真实地反映矿区Au元素异常值情况,有利于指导找矿,取得了良好的找矿效果。因此,本次试验工作方法对指导类似金矿区土壤测量样品野外加工处理具有一定的借鉴意义。

Influence of the processing method in soil survey on determination of gold anomalies and application: An example of the Mianhuapo mining area in Northeast Hunan

In prospecting and detailed investigation of geological exploration work,the indicating role of soil geochemistry is one of the important decisive factors. With the development of surface and shallow minerals,it is increasingly difficult to prospect deep blind ore-bodies. According to the current processing methods and technical requirements of soil samples,the analysis data of soil survey in mineralization sections of the gold mining area are weakened and the lower limit values of element anomalies are on the low side.In order to solve the problem in anomaly determination from anomaly depletion, this work attempts to improve and adjust the processing method of soil samples. For the first time, it is proposed to finely divide samples from the field, after drying without sieving processing. This method has been applied to the ore search in the Mianhuapo gold mine of Liling city,Northeast Hunan. The results of the test and the content curves were analyzed. The comparison shows that the non-sieving processing samples can better reflect the anomalies of Au element in the mining area. It can help guide ore search, and achieve good results. Therefore, this test has some reference meaning for sample processing in soil survey in similar gold mining areas.