青海祁漫塔格山南坡1∶5万水系沉积物地球化学特征及成矿潜力分析

GEOCHEMICAL CHARACTERISTICS AND METALLOGENETIC POTENTIAL ANALYSIS OF 1∶ 50 000 SEDIMENTS IN THE SOUTHERN SLOPE OF QIMANTAGESHAN,QINGHAI

根据1∶50 000土壤地球化学测量工作成果,对获得的9 880件土壤样品中Au、Ag、Sn、As、Sb、Bi、Co、Cu、Pb、Zn、Cr、W、Mo、Ba、Ni、V等16种元素进行了分析。测试表明,Pb、Zn、Ag、Mo等金属元素在该区相对丰度尤为突出更易富集而成矿。R型因子分析中,得到Co-Cr-Ni、Cu-Bi-Zn-W、Pb-Zn-Ag、Fe-Co、Mo-V、Sn、Au 7种地球化学分区类型。R型聚类分析中,在α=0. 01、γ=0. 36的相关水平上可分为二族,Ⅰ簇反映了基性岩、超基性岩及岩浆作用,Ⅱ簇是显示成矿作用的主要元素。通过区域地质背景、成矿地质条件和成矿规律研究分析,研究区内圈定成矿远景区4处,优选出7处重点找矿靶区,显示出较好的找矿潜力。

According to results of 1∶ 50 000 soil geochemistry measurement,16 elements of 9880 soil samples,such As,Au,Ag,Sn,As,Sb,Bi,Co,Cu,Pb,Zn,Cr,W,Mo,Ba,Ni and V were analyzed. The test shows that the relative abundance of Pb,Zn,Ag,Mo and other metallic elements in this area is particularly prominent and easy to be enriched and mineralized. In the R-mode factor analysis,seven types of geochemical zoning were obtained： Co-Cr-Ni、Cu-Bi-Zn-W、Pb-Zn-Ag、Fe-Co、Mo-V,Sn and Au. In the R-mode cluster analysis,it can be divided into two groups at the correlation level of α = 0. 01 and γ = 0. 36. The cluster I reflects basic rock,ultramafic rock and magmatism,and cluster II is the main element of matallogenesis. Based on the analysis of regional geological background,metallogenic geological conditions and regularity of mineralization,4 metallogenic prospects were delineated and 7 key prospecting target areas were selected,which showing good prospecting potential.