新疆且末县米特河地区1:5万水系沉积物地球化学特征及找矿意义

根据1:5万水系沉积物地球化学测量工作成果,对采集的3138件样品中Cu,Pb,Zn,Au,Ag,W,Sn,Mo,Bi,As,Sb,Cr,Co,Ni共14种元素进行分析测试。研究结果表明,Au,Ag,Cu,Ni是区内最有找矿潜力的成矿指标元素;聚类分析所划分的4类元素簇群,主要与中低温成矿元素、阿尔金南缘断裂、蛇绿混杂岩相关,通过因子分析得到Ni-Cr-As-Sb-Cu-Bi,W-Bi-As-Cu,Bi-W,As,Ag-Zn-Pb,Cu-Bi-As共6类元素组合。其中Cr,Ni,Sb,Cu,As,Bi组合反映出与低温热液活动和断裂构造活动有关;Cr,Ni元素的富集主要与研究区内叶桑岗蛇绿混杂岩带关系密切;Ag,Pb,Zn组合则与地层低温热液元素局部富集和断裂构造活动密切相关。在综合异常分析和查证的基础上,结合区域成矿地质条件、区内矿产地质特征,圈定、划分出2个找矿远景区,并指出了研究区内以金、铜、银、镍为主要优势矿种,铅、锌为潜力矿种。

Geochemical Characteristics and Prospecting Significance of Stream Sediments System with the Scale of 1:50000 in Mitehe Area in Zheimo County of Xinjiang Xinjiang Uygur Autonomous Region

Based on geochemical measurements results of stream sediments system with the scale of 1:50000,14 elements of 3138 samples have been tested,such as Cu,Pb,Zn,Au,Ag,W,Sn,Mo,Bi,As,Sb,Cr,Co and Ni.It is showed that Au,Ag,Cu,Ni are the most potential metallogenic indexs in the region.The cluster analysis is divided into four kinds of element clusters,which are mainly related to the middle and low temperature ore-forming elements,southern margin faults of Altun and ophiolite.Through factor analysis,six kinds of element combinations have been obtained,including Ni-Cr-As-Sb-Cu-Bi,W-Bi-As-Cu,Bi-W,As,Ag-Zn-Pb,Cu-Bi-As.Among them,Cr,Ni,Sb,Cu,As,Bi assemblages reflect that they are related to low-temperature hydrothermal activity and faulted structural activity;the enrichment of Cr,Ni elements is mainly related to Yesanggang ophiolite melange belt in the study area;Ag,Pb,Zn assemblages are closely related to local enrichment of low-temperature hydrothermal elements and faulted structural activity.Based on comprehensive analysis and verification of anomalies,combining with regional metallogenic geological conditions and geological characteristics of the minerals in the area,two prospecting areas are delineated and divided.It is pointed out that main dominant minerals in the study area are gold,copper,silver and nickel,while lead and zinc are potential minerals.