黑龙江塔源金银铜矿地质特征与找矿方向

Geolgical characteristics and prospecting direction of Tayuan gold-silver-copper depotsit in Heilongjiang

塔源金银铜矿矿床地质特征及含金石英脉流体包裹体研究结果表明:矿床形成与岩浆热液关系密切,矿体大部分受断裂及构造蚀变带控制,其上下盘为斜长花岗岩,矿体呈脉状、透镜状产出,矿石构造以浸染状脉状为主。从矿区不同期次石英脉、不同矿化阶段围岩中采取黄铁矿标本,18件样品的δ34S平均值为-3.37×10-3,变化范围为1.40×10-3～-7.80×10-3,极差为9.20×10-3。包裹体均一温度为180℃～200℃。结合元素组合特征,认为该矿床成因属浅成低温热液矿床。通过对物化探资料多元地质信息的综合研究认为:围岩蚀变、物化探组合异常可以作为一个重要找矿标志;Cu、Pb、Ag是主要成矿指示元素,清楚地反映了矿化蚀变带和控矿构造范围;Au异常能准确地指示矿体(含矿石英脉)所在位置;高电阻率与高极化率可作为重要的地球物理找矿间接标志。近南北向或北西向断裂构造岩浆活动地带,在火山活动中心及两侧可作为重点找矿靶区。

The research results of geological characteristics and fluid inclusions in gold-bearing quartz veins of Tayuan gold-silver-copper deposit show that the formation of mineral deposit related with magmatic hydrothermal,and most of the ore bodies controlled by fractures and tectonic altered zone,in which the upper and lower walls of the ore body are plagioclase granites,ore body are outputted in vein and lenticular shapes,and the disseminated vein shape is the main structure type.Taking pyrite specimens from a variety of times of quartz veins and mineralization stages of the surrounding rocks in mining area,18 samples show the δ34S averaging of-3.37×10-3 and varying from ＋1.40×10-3 to-7.80×10-3,with the level difference as 9.20×10-3.Fluid inclusions homogenization temperature is 180℃~200℃.The results show that it belongs to epithermal deposit combined with the characteristics of element assemblage.The synthetic analysis of geophysical and geochemical exploration multi-information shows that the wall-rock alteration and the combination anomaly of geophysical and chemical exploration data can be regarded as an important prospecting mark;Cu,Pb,Ag are main prospecting indicator elements,which clearly reflects the mineralized alteration zone and ore-controlling structure rang;Au anomaly can accurately points out the ore body position;and high resistivity and high polarizability can be regarded as the important indirect marks of geophysical prospecting.The faulted structure magma activities area in NS or NW trends can be used as the important prospecting target in the center volcanic activity and both sides.