西藏拉屋矿床元素组合异常分析及找矿方向  

Element Composite Anomalies and Prospecting Direction in Lawu Deposit,Tibet

作　　者：兰双双[1] 郭秀梅[2] 李光明[3] 马国桃[3] 

机构地区：[1]四川省冶金地质勘查院,四川成都610051 [2]成都理工大学地球科学学院,四川成都610059 [3]成都地质矿产研究所,四川成都610082

出　　处：《金属矿山》2014年第7期114-117,共4页Metal Mine

基　　金：国家重点基础发展计划(973计划)项目(编号:2011CB403106);中国地质调查局青藏专项(编号:1212010918033)

摘　　要：通过对西藏拉屋铜铅锌多金属矿床元素地球化学数据进行分析,表明成矿元素在地质体内的分布不均匀;采用相关分析和聚类分析对矿床内的地球化学元素进行研究,认为矿区内的Cu、Pb、Zn、Ag、Bi、Au、Hg、Sb、As 9种元素呈正相关,与铜铅锌成矿作用有关的元素组合为Cu-Pb-Zn-Ag-Bi;利用异常下限圈定出了Cu、Pb、Zn、Ag、Bi元素异常区,确定了具有找矿潜力的叠加异常区3个:1#异常区Cu、Zn、Pb、Bi和Ag元素异常叠加显著,异常浓度集中,具有寻找矽卡岩型矿的潜力;2#异常区内土壤样化学分析中Pb元素的异常高达3 800×10-6,Zn元素的异常高者也有5 000×10-6,具有一定的寻找低温热液型铅锌矿的潜力;3#异常区受断裂叠加改造和后期岩浆侵入的影响,Cu异常浓度集中,土壤样化学分析中Cu元素品位值达到0.2%,具有一定寻找铜矿的潜力。Through the analysis on the elements geochemical data of Lawu Cu-Pb-Zn polymetallic deposit in Tibet,it is shown that the ore-forming elements are not evenly distributed in geological bodies. The correction analysis method and cluster analysis method are adopted to investigate the geochemical elements in the deposit. It is found that the nine elements such as Cu, Pb, Zn, Ag, Bi, Au, Hg, Sb, As have positively correlation with each other and the Cu-Pb-Zn-Ag-Bi combination associated with Cu-Pb-Zn mineralization. Anomaly areas of Cu-Pb-Zn-Ag-Bi are delineated through the anomaly threshold. Three superim- posed abnormal areas with potential ore-prospecting are identified. The elements anomalies superimposed of Cu-Zn-Pb-Bi-Ag are significant, and the elements anomaly concentration concentrates on the No. 1 anomaly area, hence, the area has potential in seeking for skarn ore deposit. According to the chemical results of soil samples in No. 2 anomaly area, the element anomaly val- ue of Pb is 3 800 × 10-6 ,the element anomaly value of Zn is 5 000 × 10-6 ,therefore,the area has potential in searching for low-temperature hydrothermal Pb-Zn ore deposit. The No. 3 area is affected by the fault reformation and the late magma intru- sion, so, there is high abnormal Cu in the area and the element grade of Cu is 0.2%, therefore, the area has potential in search- ing for Cu ore deposit.

关 键 词：相关分析 聚类分析 组合异常 

分 类 号：P595[天文地球—地球化学]