西藏斯弄多银多金属矿床岩石地球化学特征及找矿前景

Characteristics of rock geochemical anomalies and prospecting potential of the Sinongduo silver polymetallic deposit,Tibet

西藏斯弄多银多金属矿床是在林子宗群陆相火山岩中发现的首例低硫型浅成低温热液型矿床,其独特的成因及成矿地质背景预示着在冈底斯南缘具有巨大找矿潜力。对矿区开展大比例尺岩石地球化学测量,研究该矿床成矿元素分带特征,结果显示:Pb、Zn、Cd、Ag、Au含量的变异系数和标准偏差均较大,表明该系列元素整体的富集强度和富集能力比较高;聚类分析显示Pb、Zn、Cd、Ag、Au具有极高的相关性,表明该组元素与成矿具有密切关系;单元素异常按累积频率达75%、95%和98.5%进行分级,最终圈定2个具有找矿潜力的异常区。基于上述岩石地球化学特征研究,以期为冈底斯成矿带找矿工作提供地球化学找矿方法指导。

The Sinongduo silver polymetallic deposit is the first low sulfidation epithermal deposit found in the Linzizong volcanic rocks.Its unique origin and metallogenic geological background indicate great prospecting potential of the south Gangdise metallogenic belt.The zoning characteristics of metallogenic elements were studied by means of large scale rock geochemical survey in the Sinongduo deposit.The large coefficient of variation and standard deviation of Pb,Zn,Cd,Ag and Au indicate the high enrichment and enrichment capability of these elements.Cluster analysis shows high correlation between Pb,Zn,Cd,Ag and Au which are considered to be the main mineralization elements.Element anomalies are classified according to the cumulative frequency of 75%,95%and 98.5%and 2 anomalies area are considered to have high prospecting potential.The authors are in the hope that the data obtained can provide a guide for the geochemical prospecting in the Gangdise metallogenic belt.