丹巴地区多金属矿地球化学特征及找矿意义

在了解地质特征及地球化学背景特征的基础上，对丹巴地区1∶5万地球化学水系沉积物测量数据进行分析处理，采用均值加二倍标准离差确定了16种元素的单元素异常下限值，并在此基础上圈定5处综合异常，分别为门子沟综合异常区、石板棚综合异常区、干洛坝综合异常区、洼里综合异常区、孔玉综合异常区，认为这5处综合异常均具有良好的成矿条件，有进一步工作的潜在价值。结合区域地质和成矿条件，对研究区内进行了成矿地球化学推断和预测，总结了铜铅锌金银几种主攻矿种水系地球化学找矿标志，认为金的富集多与热液作用有关，受断裂带控制，产于断裂构造复合部位，铅锌主要以含矿石英脉形式产出。这将为下一步探矿工作提供指导。

Study of Geochemical Characteristics and Prospecting Significance of Polymetallic Mine in Danba

Based on the understanding of geological characteristics and geochemical background characteristics of Danba area,the lower limit value of single element anomaly for 16 kinds of element is determined by adopting the mean plus the standard deviation of two times,through analysis and processing of 1∶50 000 stream sediment geochemical survey data.Based on this,five comprehensive anomaly areas were delineated respectively,called Menzigou comprehensive anomalous area,Shibanpeng comprehensive anomalous area,Ganluoba comprehensive anomalous area,Wali comprehensive anomalous area,Kongyu comprehensive anomalous area.It is considered that this five integrated anomaly zone has good ore-forming condition,and has a potential value in further ore-prospecting.Combined with regional geology and mineralization conditions,the geochemical characteristics of mineralization in the area were inferred and forecasted,and the water geochemical prospecting marks of several main minerals of copper,lead,zinc,gold,and silver are summed up.It is considered that the enrichment of gold has a relation with hydrothermalism.It is controlled by fracture belt,and generated at composite parts of fracture structure.Lead and zinc mainly occur in the ore bearing quartz veins.This research will provide guidance for the next exploration work.