浙江治岭头金银矿体的控矿构造

Ore control structures of Zhilingtou gold-silver deposit in Zhejiang

治岭头金银矿基底发育八都群变质系,盖层为晚侏罗世火山岩系,金银矿体赋存于变质岩系中,金银矿体受控于变质基底的韧性共轭剪切带。研究认为,NW方向的韧性剪切带具有右行平移性质,NE方向的韧性剪切带具有左行平移性质,EW方向剪切带未见剪切动向,主要为含变质岩角砾的石英脉。NE和NW两个方向的韧性剪切带具有共轭性质,EW方向剪切带位于共轭剪切带交汇部位,受到相向挤压造成的尖端钝化,SN向的脆性断裂对矿体起到破坏作用。

Zhilingtou gold-silver ore deposit had metamorphic basement of Badu Group and volcanic cover of Late Jurassic. Zhilingtou gold-silver ore deposit was located in Badu Group and controlled by conjugate ductile shear zones. The NE strike ductile shear zone was dextral shearing and NW strike shear zone was sinistral shearing. However, No shearing trend was found in EW strike zone which was formed by metamorphic breccia bearing quartz vein. The three strike shearing zones were the same system of a conjugate ductile shear. The mined gold-silver ore body was located in northern part of conjugate shear zone.