摘要:
基于甘肃省沃尔给楔卡金矿1∶1万土壤地球化学测量数据,运用R型聚类分析方法对测量数据进行分析,结果显示:8种元素可分为3类:第一类为Sb、As、Au、Pb、Ag中低温元素组合;第二类为Cu、Zn中高温元素组合;第三类为以Hg为代表的挥发性元素.根据单元素异常分布特征及元素组合异常,结合地层、岩性、构造等有利控矿因素综合圈定出3个找矿靶区,并运用系统核理论对其进行异常评价.Ⅰ、Ⅱ和Ⅲ号异常区系统的核分别为{Au,Pb}、{Au}及{Cu},系统稳定性强,其中Ⅰ和Ⅱ号异常区经钻探和槽探等工程验证,矿化位置、规模与元素异常浓集中心位置吻合较好,说明在这两个异常区内,土壤地球化学测量所显示的异常为矿致异常;Ⅲ号异常区系统的核为{Cu},并在该异常区内显示以Cu、Au为主要成矿元素的异常,这与野外踏勘中发现有孔雀石及铜蓝较为一致,建议展开对该异常区的相关工程查证.
Abstract:
Based on 1∶10 000 soil geochemical survey on the Woergei gold deposit in Gansu Province, the authors used the R-model factor analysis method to evaluate geochemical anomalies.Cluster analysis of the soil geochemical data obtained from the Woergei gold deposit shows that eight kinds of elements can be grouped into three categories, i.e.,(1) Sb,As,Au,Pb,Ag;(2) Cu,Zn;(3) Hg.Combined with favorable ore-controlling factors such as lithology and structure,the authors applied the system core theory to synthetic evaluation of main ore-forming elements and the abnormal element combination,and then selected three prospecting target areas.In No.Ⅰ,Ⅱ and Ⅲ anomaly target zones,the systems of nuclear are respectively {Au,Pb},{Au} and {Cu},the system stability is strong,and the abnormal Ⅰ and Ⅱ areas were verified by drilling and pit engineering.The mineralization location,size and element anomaly concentrated heart position are in good agreement in the two abnormal zones,suggesting that soil geochemical survey is effective in the study area.However,No.Ⅲ anomaly target zone has the system of nuclear of {Cu},with the anomaly in the area displaying the main ore-forming elements Cu Au anomalies,the malachite and covellite were found in field investigation, which are relatively consistent with the anomaly target area,and hence drilling and pit engineering in the abnormal area should be conducted.
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