浅谈脉岩在热液矿床成矿中的作用——以河北蔡家营铅锌银矿床为例  

Discussion on Quartz porphyry dike in the metallogenetic process of hydrothermal lead-zinc-silver mineralization ——A case study on Caijiaying Pb-Zn-Ag deposit, Hebei

作　　者：梁瑞[1] 白海军[1] 赵军[1] 徐超[1] 张晓梅[1] 

机构地区：[1]河北省地矿局第三地质大队,张家口075000

出　　处：《矿产勘查》2012年第6期767-773,共7页Mineral Exploration

摘　　要：蔡家营铅锌银矿区位于华北地台北缘,为以锌为主的大型铅锌多金属矿床。目前查明锌金属资源储量约200万t,平均品位为4.23%,最高49%,其他为伴生元素,矿床成因属次火山中温热液型。其热液矿床"三位一体"成矿因素中的岩浆岩为燕山期火山活动形成的脉状次火山岩——石英斑岩,虽为脉岩,单个脉体规模均较小,能量较低,但因其分布密集,深部与岩浆源相沟通,亦蕴含较大的热能及成矿物质,对形成较大规模的多金属热液矿床起到了至关重要的作用。由此认为,在地层、构造条件适宜,虽地表未发现较大规模的岩浆岩体,但脉岩密集分布的区域,也具有寻找大型热液型矿床的远景。此问题的探讨希望对今后的区域找矿具有一定的指导意义。The Caijiaying Pb- Zn- Ag deposit, one large- sized lead- zinc polymetallic deposit, located in the northern margin of North China Platform, which has been widely known as a significant exploration breakthrough in the region. The proven resource of zinc metal reaches 2.0Mt at a grade of 4.23% zinc, up to 49%. Also there are some associated elements like lead, silver. The genesis of the ore deposit belongs to the sub - volcanic mesothermal mineralization. The metallogenetie model was summarized as ＂Three Components, One System＂ model. Among three components, the host rock - quartz porphyry dike, which formed in the subvoleano environmentas a result of the geodynamie evolution during the Yanshanian orogenieal period. Although the size of each quartz porphyry dike is small, and weak energy, the widely dense distributed dikes in the deposit area which probably connect the deep hidden magma, may contain powerful energy and bring rich mineralization elements, therefore, it will play the key role in the formation of zinc - lead - silver mineralization. It is meaningful for the regional exploration discovery of lead - zinc polymetallic deposit by the research of the closely spatial relationship between quartz porphyry dikes andmineralization in those areas where dense dikes occur.

关 键 词：脉岩 热液矿床 成矿机制 河北 蔡家营铅锌银矿 

分 类 号：P588.13[天文地球—岩石学] P611.1[天文地球—地质学]