河南嵩县东湾金矿田地质特征及找矿远景

Geological Characteristics of the Dongwan Gold Ore Field in Songxian County,Henan Province and its Ore-Search Prospect

东湾金矿田受区域性近南北向和近东西向构造联合控制,岩浆活动强烈,成矿地质条件好,已发现多处金矿床及金矿点。主要金矿体呈脉状或透镜状赋存于东湾断裂蚀变带及其两侧的近东西向断裂带内,构造带宽2～20m不等,最大宽度超过30m。矿体倾角50°～65°,空间上呈舒缓波状延伸,膨大收缩、分枝复合现象普遍。与金矿化关系密切的矿化蚀变主要为硅化、黄铁矿(褐铁矿)化、方铅矿化、黄铁绢英岩化、绢云母化和碳酸盐化。区域成矿学及物化探研究表明,东湾断裂南段的近5km空白区具有较好的找矿潜力,验证钻孔证实该段构造带内有工业矿段存在。

The Dongwan gold ore field is jointly controlled by nearly E-W trending faults and nearly N-S trending faults.In this area,strong igneous activities of different geological periods resulted in good metallgonenic geological conditions.Several gold deposits and much gold mineralization sites have been found in this region.Main gold orebodies in dikes and lens occur in the Dongwan alteration zones and adjacent nearly E-W trending fault zones.Spatially,the ore-bodies strike NWW-SEE and dip NE at angles 30o～50o,with dilatation,contraction,offset and recombination of branches.Wall rock alteration related with gold mineralization contains silicification,pyritization,beresitization,sericitization,and carbonatization.Regional metallogeny and comprehensive geophysical and geochemical exploration studies indicate that the 5km virgin zone at the southern segment of the Dongwan fault is a good metallogenic belt and has a good ore-search prospect.And the existence of industrial ores in this segment has been confirmed by testing drill holes.