云南澜沧坝老铅多金属矿区岩石地球化学特征

Rock Geochemical Characteristics of Lead Polymetallic Deposit of Balao in Lancang of Yunnan

云南澜沧坝老铅多金属矿区地处冈底斯-念青唐古拉构造成矿带南段,区内矿点多,除铅锌外,还有金、银、铜、锡、钨、锑等多种金属。根据研究区的地质资料,对研究区进行了岩石地球化学测量,确定Ag、Pb、Cu、Zn、Hg、Sn、W、Mo、Bi、Sb、As11个元素组合作为研究的最佳指示元素,对所取得的数据进行了因子分析、聚类分析、对应分析等多元统计分析。选用迭代法确定背景值和异常下限,做出综合异常图。通过分析岩石地球化学异常形态、规模、浓度分带等,进行靶区快速定位预测与优选,圈定找矿靶区3处,为寻找盲矿体,缩小靶区提供依据。对研究区资源潜力作出初步评价,为进一步勘查和开发利用提供地质依据。

The exploration area of Lead polymetallic deposit of Balao in Lancang county is located in the southern section of Gangdise-Nyainqentanglha tectonic metallogenic belt.There are many mine sites in the region such as gold,silver,copper,tin,tungsten,antimony,in addition to lead-zinc.Rock geochemical of the study area was measured,according to the geological data of the study area,to detemine eleven elements combination such as Ag,Pb,Cu,Zn,Hg,Sn,W,Mo,Bi,Sb,As,as the best indicator of present study,the data obtained was analysed multivariate statistically such as factor analysis,cluster analysis and correspondence analysis.Integrated anomaly map was made through the selection of iterative method to determine the background value and anomaly threshold.Three prospecting targets were delineated by analyzing rock geochemical anomaly patterns,scale,concentration zonation to locate,predict quickly,and prefer the targets,to provide a basis for looking for blind ore bodies and narrowing target.The resource potential of the exploration area was made a preliminary evaluation,and the geological basis was provided,for further exploration and development and utilization of the research area.