基于采样点的化探异常成矿元素研究——以广东大宝山铜多金属矿田为例

A study of anomalous ore-forming elements based on geochemical sampling points:A case study of the Dabaoshan copper-polymetallic orefield in Guangdong Province

化探异常成矿元素的确定是异常评价的主要问题之一。在总结前人研究工作的基础上提出了一种基于采样点的成矿元素确定方法,将异常矿化度、异常衬度值与浓集系数联系起来,提出浓集系数越低的元素,成为成矿元素要求其异常矿化度越高,异常衬度值越低;一定范围内采样点上第一成矿元素的组合反映了矿种类型。将该方法成功应用于广东大宝山铜铅锌钨钼多金属矿田构造岩石测量成矿元素的分析中,对于详细分析化探异常主要成矿元素及其分布、分带特征具有重要的实用价值,适用于浓集系数不同的元素成矿能力的比较研究。

The determination of the ore-forming elements is one of the main problems of geochemical anomaly evaluation. Based on previous studies,the authors propose a new method of ore-forming elements determination based on geochemical sampling points,in which anomaly mineralization and anomaly contrast are linked to the concentration coefficient. The lower the concentration coefficient of the element,the higher the anomaly mineralization and the lower the anomaly contrast to ore-forming element. The composition of first oreforming elements based on the sampling point within a certain range reflects the mineral type. The method was successfully applied to the ore-forming elements analysis of the structure-rock sample from the Dabaoshan copper-lead-zinc-tungsten-molybdenum polymetallic orefield in Guangdong Province. It has important practical value for a detailed analysis of the main ore-forming elements of geochemical anomalies and their distribution,and is suitable for a comparative study of mineralization capabilities of elements with different concentration coefficients.