祁雨沟金矿区J7角砾岩筒隐爆中心及找矿方向研究

Study on the crypto-explosive center of J7 breccia pipe in Qiyugou Gold District and prospecting direction

祁雨沟金矿区及附近发育32个隐爆角砾岩筒,J7角砾岩筒是该区最大的矿化角砾岩筒,呈北西走向,地表出露长度1 347 m,最大宽度926 m,面积0. 71 km^2。通过对已施工的41个钻孔及5个中段探矿坑道原始编录结果的综合分析,发现J7角砾岩筒存在一个隐爆中心,该隐爆中心位于J7角砾岩筒中部膨胀部位的中心。在该隐爆中心部位,角砾岩相对破碎,角砾粒径较小,角砾大小分异不明显,岩石孔洞发育,绿帘石化强烈。矿体多赋存于J7角砾岩筒隐爆中心的下盘位置,下一步的找矿工作应在隐爆中心的北部及北西方向以寻找胶结物型金矿体为主,指明了找矿方向。

Among the 32 crypto-explosive breccia pipes developing in and around Qiyugou Gold District,the J7 breccia pipe is the biggest mineralized breccia pipe in the district.It takes the NW trending,outcropping length is 1 347 m ,maximum width is 926 m and area is 0.71 km^2.Comprehensive analysis of the original compilation results from the exploration pits of 41 constructed drill holes and 5 levels finds that there is a crypto-explosive center in J7 breccia pipe which sits on the center of the swelling part in the middle of J7 breccia pipe.At this crypto-explosive center,the breccia is relatively fragmented,the grain size of the breccia is small,the fractionation of breccia size is not obvious,the rock holes develop and epidotization is intense.The orebodies often occur at the footwall of the crypto-explosive center of J7 breccia pipe.The next-step prospecting work should focus on the north and northwest of the crypto-explosive center and the discovery of cement type gold orebodies.