广西河池北香铅锌锡多金属矿床矿石矿物组构特征分析

The texture and structure characteristics of ore minerals of Beixiang Pb-Zn-Sn polymetallic deposit in Hechi,Guangxi

通过宏观、微观镜下分析及X射线粉晶衍射分析等工作,研究河池北香铅锌锡多金属矿床的矿石矿物特征。结果表明,矿区矿石的工业类型主要分为四种:以锌为主的锌矿石、以铅为主的铅锑矿石、以黄铁矿-闪锌矿-方铅矿为主的矿石以及细晶黄铁矿为主的黄铁矿石;矿石结构主要有他形粒状结构、自形-半自形粒状结构、针状结构、斑状结构、草莓状结构、交代熔蚀结构、压碎结构等;矿石构造以细脉状构造、对称条带状构造、块状构造为主,其次为晶洞构造、纹层状构造等。初步厘定矿区成矿期次。根据组构特征及成矿期次,明确矿床类型属于早期喷流沉积和后期岩浆热液充填改造的两期多因矿床。

The ore mineral characteristics of Beixiang Pb-Zn-Sn polymetallic deposit in Hechi are studied by the macro-observation,microscope and X-ray powder diffraction method.The result shows that there are four types of ores in the mining area,including the zinc ore,the lead-antimony ore,the pyrite-sphalerite-galena ore and the fine-grained pyrite ore.The ores are mainly in xenomorphic granular,euhedral-hypidiomorphic granular,acicular,porphyritic,framboid,metasomatic,or cataclastic texture.The ore structure is mainly of fine veinlet,symmetrical banded,massive and secondarily miarolitic and lamellar structures.The metallogenetic phases are preliminarily determined.The deposit genesis is inferred to be two-stage polygenetic phases of early exhalative sedimentation and later magmatic hydrothermal fluid filling and reconstructing.