马扎拉金锑矿元素组合异常及找矿方向

Element Combination Anomalies and Prospecting Direction in Mazhala Gold-antimony Deposit

岩屑地球化学测量作为一种初期勘探方法应用极为广泛,由于矿床次生晕异常分布范围广,如何缩小靶区范围,降低非矿致异常带来的干扰,减少异常查证的工作量,以便进一步准确定位矿体,成为化探工作中需要重点解决的问题。利用西藏措美县马扎拉矿区1∶1万岩屑地球化学测量数据,采用因子分析、聚类分析划分出Au-Sb-As、Pb、Hg、Zn、Ag等5类元素组合,并绘制了因子得分等值线图,在此基础上探讨了Au的找矿方向,缩小了预测靶区。结合矿区实际地质情况认为:区内Au、Sb、As和其余元素间有着明显不同的物质来源;矿区东南角及西北角为两处成矿潜力较好的区域;下一步除继续在矿区东南角构造交汇位置重点开展找矿工作外,还可对矿区南侧以及西北部进行相应的工程验证。

Cuttings geochemical survey method as an initial exploration method is widely used in geological prospecting work. Due to the large distribution scope of secondary halo anomalies,how to narrow the scope of target zone,reduce the interference to mineralization anomalies and lower the workload anomalies verification to locate the ore-body accurately become the important problems that should be solved in the process of geochemical exploration work. Based on the 1∶ 10 000 cuttings geochemical survey data of Mazhala mining area in Comai county,Tibet,five types of element association Au-Sb-As,Pb,Hg,Zn,Ag,are divided by adopting the factor analysis method and cluster analysis method. Besides that,the factor score isopleth map is drawn so as to discuss the Au prospecting direction and narrow the target prediction area. Based on the actual geological situation of the mining area,it is concluded that the materials source of the Au,Sb and As are different to the other elements obviously in the mining area. The southeastern and northwestern corners are the good area of metallogenic potential. Further exploration should be conducted the tectonic intersection location area in mining area,and some exploration verifications should be carried out in the southern and northwestern corner in the mining area.