小秦岭西峪-桐峪金矿矿床物质组分及金赋存状态研究  

Material Components and Occurrence States of Gold and Silver in the Xiyu-Tongyu Gold Deposit,Xiaoqinling,Shaanxi Province

作　　者：范东旭 夏元鹏 FAN Dongxu;XIA Yuanpeng(School of Earth Sciences,Yunnan University,Kunming 650504,Yunnan,China;Shaanxi Mining Industry and Trade Co.Ltd.,Xi’an 710054,Shaanxi,China)

机构地区：[1]云南大学地球科学学院,云南昆明650504 [2]陕西矿业开发工贸有限公司,陕西西安710054

出　　处：《西北地质》2023年第1期254-265,共12页Northwestern Geology

摘　　要：在野外工作的基础上,笔者通过对小秦岭金矿田中西峪-桐峪金矿光薄片鉴定、化学成分分析、电子探针分析等,查明了该矿(带)共有11条含金构造带,主要赋存于太华群大月坪组和于洞沟组,矿床赋矿岩性为黄铁矿-多金属硫化物石英脉、多金属硫化物铁白云石石英脉和蚀变岩,矿石构造主要为团块状、浸染状、脉状、网脉状、星散(星点状)状、条带状构造。载金矿物主要为黄铁矿,次为黄铜矿、方铅矿和磁黄铁矿,脉石矿物主要为石英,其次为绢云母。金矿物以独立矿物形式存在,以粒间-裂隙金为主,粒度大多为0.16~0.32 mm,矿石的结构构造有利于矿物的解离。本区金矿成矿作用主要为热液成矿期,可分为金-黄铁矿-石英阶段、金-黄铁矿-多金属硫化物-石英阶段和黄铁矿-磁黄铁矿-碳酸盐阶段。The Xiyu-Tongyu gold deposit locates in the north of the Xiaoqinling gold field.Based on the geological field work,through the identification of thin sections,chemical composition and electron probe analysis,it is found that there are 11 gold-bearing structural zones in the deposit,which occur mainly in the Dayueping and Yudonggou Formations of the Taihua Group.The ore-hosting lithology of the deposit is pyrite polymetallic sulfide quartz vein,polymetallic sulfide ferrite quartz vein and altered rock.The ore structure is mainly massive,disseminated,veined,net veined,scattered(starpoint)and banded.The main gold-bearing minerals are pyrite,followed by chalcopyrite,galena and pyrrhotite.The main gangue minerals are quartz,followed by sericite.Gold minerals exist in the form of independent minerals,mainly intergranular and fissure gold,with the particle size concentrated in 0.16~0.32 mm.The structure of the ore is conducive to mineral dissociation.Gold mineralization in this area mainly belongs to hydrothermal mineralization stage,which can be divided into gold-pyrite-quartz stage,gold-pyrite-polymetallic sulfide-quartz stage and pyrite-pyrrhotite-carbonate stage.

关 键 词：物质组分 金赋存状态 西峪-桐峪金矿矿床 小秦岭 陕西 

分 类 号：P61[天文地球—矿床学]