内蒙古陈家杖子金矿地质特征及资源潜力探讨

THE GEOLOGICAL CHARACTERISTICS AND POTENTIALITY OF CHENJIAZHANGZI GOLD DEPLSIT IN INNER MONGOLIA, CHINA

赤峰市南部地区位于北东向中生代大兴安岭岩浆火山岩带与华北地台北缘东西向构造的交汇部位,中生代岩浆火山岩带侵入并覆盖了前寒武纪结晶基底,形成了一套广泛分布的火山、次火山岩系,成矿地质条件优越,陈家杖子金矿床是近年来在该区发现的与中生代岩浆火山岩带有关的隐爆角砾岩(潜火山岩)型新类型矿床,通过对其地质、地球物理、地球化学特征的分析,初步认为陈家杖子金矿床应为一斑岩型金(铜)成矿系统的组成部分,目前查明的金矿体仅为矿床的顶部,其深部应赋存有规模更大的金、铜多金属矿体。该矿床具有上金下铜的特点,有较大的资源潜力,建议加强该矿床深部的勘查工作,对该矿床进行解剖、评价,以扩大资源远景,并建立矿床模型,指导区域矿产勘查工作。

The recently discovered Chenjiazhangzi gold deposit in southern Chifeng, Inner Mongolia belongs to the cryptoexplosive breccia type related to Mesozoic magmatism - a new type in this area. The study on the characteristics of geology, geophysics and geochemistry for the deposit shows that it is a part of a porphyry gold-copper mineralizing system, in which the upper is rich in gold and the lower rich in copper. The explored ore body is only the top of the deposit while bigger gold-copper ore body existing in the deep. In addition, there are some similar cryptoexplosive breccia pipes distributed in groups or zones around the esposit. These breccia pipes are associated with geochemical anomaly, showing promising information. It is suggested that the exploration should be concentrated on the deep of the deposit to enlarge potential resources. A deposit model should be established in order to guide ore prospecting in the region. The porphyry gold-coper deposits related to the cryptoexplosive breccia should be explored according to geochemical and geophysical anomalies in the region.