北大巴山震旦寒武系中铜锌矿特征及找矿前景

北大巴山属南秦岭造山带,在震旦-寒武纪形成一套以深水滞流盆地相为主的硅质炭质碎屑岩夹碳酸盐岩沉积.自开展地质大调查工作以来,该区域发现大量的铜锌矿点.根据矿体赋存位置、成因及矿石类型,铜锌矿可分为韧性剪切带型、石英脉型及岩浆岩接触变质型三种类型.通过对区内铜锌矿成矿规律的总结及成矿条件的分析,认为北大巴山具有良好的矿源层、完善的输导系统、丰富的储矿空间,因而具有较大的找矿潜力.指出深大断裂带附近的庄子沟组中碳酸盐岩为有利的赋矿部位.

Geological Characteristics and Prospecting Potential of the Copper and Zinc Ore Deposits in the Sinian and Cambrian Systems of the Northern Daba Shan

Abstract: The northern Daba Shan is part of the South Qinling orogenic belt, where deposited a set of siliceous-carbonaceous clastic rocks interbedded with carbonate sediments dominated by deep stagnant basin facies formed in the Sinian-Cambrian epoch. Previous exploration has discovered a large number of copper and zinc mineral occurrences or ore deposits, which are classified into the ductile shear zone type, quartz vein type and magmatic rocks contact metamorphic type according to the occurrence location, genesis of ore-bodies and types of the ores. Studies on the metallogenic conditions and regularities of these copper and zinc ore deposits suggest that the northern Daba Shan owns good source beds, perfect transporting and conducting systems and rich ore-storage space, indicating its large prospecting potential. It is pointed out that the of Zhuangzigou Fm. carbonate rocks adjacent to the deep and large faults are favorable ore-bearing loci.