核主成分分析在地球化学元素组合异常圈定中的应用

The application of kernel principal component analysis to the anomaly delineation of geochemistry element association

地球化学元素作为成矿预测一种重要的数据源,其异常分析往往是进行下一步找矿工作的基础,也是确定找矿靶区一种重要技术手段。作者以青海省大柴旦镇柴达木山南坡一带为研究区,通过开展1:10 000土壤地球化学测量,共分析了Au、Cu、Pb、Zn、As、Sb六种元素,采用核主成分分析地球化学元素组合异常,并与主成分分析进行比较分析,从应用结果可以看出核主成分的降维效果更好。从异常等值线图可以看出,采用核主成分的异常区域分布更加集中,所圈定的元素组合异常与已知矿床点在空间上具有良好的对应关系,说明利用核主成分圈定元素组合异常能够较好地确认地球化学元素组合异常。

Geochemical element as an important data source of metallogenic prediction,the abnormal analysis is often the basis for the next step prospecting work,and is an important technical means to confirm prospecting targets.In this paper,taking Qinghai province Dachaidan town along the southern slope of the Chaidamu mountain area as the research region,carried out by 1：10000soil geochemical measure to analysis a total of Au,Cu,Pb,Zn,As,Sb six elements,and using kernel principal component to analysis geochemical anomalous element assemblage,and then compared with principal component analysis.Results can be seen from the application that the dimension reduction effect of kernel principal component is better than principal component analysis.Besides,from the unusual contour map it can be shown that the distribution of abnormal area is more concentrated by using kernel principal component analysis,and Element combination anomalies of delineation is with good correspondence between the space of known deposits.It declare that kernel principal component delineate abnormal combination of elements can be better recognized geochemical element combination anomalies.