试论中条山胡篦型铜矿床喷流成因

中条山胡篦型铜矿床赋存在早元古代中条群篦子沟组黑色碳质片岩之中.在成矿带内分布有老宝滩喷流通道(岩筒)角砾岩及沿黑色碳质片岩层内的方柱黑云片岩、矿化角砾岩、石英钠长岩、金云母石英白云石大理岩、条纹状电气石岩组成的喷流沉积(变质)岩建造,它们构成喷流沉积作用统一机构体系,明显是由富硅、水、硼及碳酸盐等海底热液喷侵的产物.上述各种岩石均有不同程度的矿化(S、Cu、Au、U、Mo).主要容矿岩石为金云母石英白云石大理岩和矿化角砾岩,其它岩石次之.矿体呈似层状或扁豆体(矿柱)产出,严格受剥离断层及褶皱构造控制.矿石主要由黄铜矿、黄铁矿、磁黄铁矿、钴镍黄铁矿、马基钴矿和硫钴矿等80余种矿物组成.早期矿石为细脉浸染状,晚期为脉状或团块状,并有辉钼矿、晶质铀矿和自然金伴生,为典型的元古代喷流沉积(变质)铜矿床(SEDEX).针对目前开采、勘查和科研已取得大量地质资料基础上,提出新一轮找矿建议.

Genetic model for metamorphosed exhalative-sedimentary copper deposits of the Hujiayu-Bizigou-Type in the Zhongtiao Region

The copper deposits of the Hujiayu-Bizigou-Type in the Zhongtiao region are hosted in black carbonaceous shales of the Paleo-Proterozoic Bizigougroup.Exhalative conduits(breccia pipes)can be seen in the Laobaotan deposit,whereas exhalative products are represented by scapolite biotite schist,mineralized breccia,quartz albitite,phlogopite quartz dolomitic marble and banded tourmalinite,which are constrained by the black carbonaceous shale layer.These conduits and exhalative rocks represent a silica-,water-,boron-and carbonate-rich submarine exhalative system.The above rocks are more or less enriched in S,Cu,Au,U and Mo.Ore metals are hosted mainly in phlogopite quartz dolomitic marble and breccias.Orebodies are stratiform or lenticular,and are minerals,which are dominated by chalcopyrite,pyrite,pyrrhotite,mackinawite,and Co-and Ni-bearing pyrite.The ores formed at the early mineralization stage are characterized by disseminated sulphides and cross-cutting veinlets,whereas late-stage mineralization occurs as veins and patches and contains molybdenite,uranite and native gold.Based upon abundant data obtained during exploration and mining,it is found that deposits of the Hujiayu-Bizigou-Type are typically exhalative-sedimentary in origin.These deposits are formed initially in the proterozoic and have undergone late-stage metamorphism.Suggestion in relation to prospecting of the Zhongtiao region is also given.