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豫南桐柏地区有两条以金银为主的多金属成矿带:北带,即围山城金银矿带,已找到破山银矿,银洞坡金矿两个大型矿床;南带,即老湾金矿带,此带长23km,宽1km左右,1986年以来,在该带上进行了大量的地质勘探工作,已划分出几个具有中型规模的含矿远景区。 一、地质背景 老湾矿化带处在秦岭东西复杂构造带南亚带的桐柏地区。区内出露以火山熔岩,火山碎屑岩及正常沉积为主的一套下古生界地层,具有中等强度的多期变质及其相应的岩浆岩的侵入。
There are two gold-silver polymetallic metallogenic belts in the area of Tongbai in the south of Henan Province: the northern belt, ie the surrounding mountainous city gold-silver ore belt, has found two large deposits of Broken Hill Silver Mine and Yindongpo Gold Mine; , Namely the Laowan gold belt, which is 23 km long and 1 km wide. Since 1986, a large number of geological exploration work has been carried out on this belt, and several ore-bearing prospect areas with medium scale have been divided. I. Geological Background The Laowan mineralization belt is located in the Tongbai area in the south-east belt of the Qinling-West complex belt. In the area, a set of Lower Paleozoic strata dominated by volcanic lava, volcaniclastic rocks and normal sedimentation are exposed, with moderate-intensity multi-stage metamorphism and corresponding magmatic intrusion.