广西清明山铜镍硫化物矿床上升气流微粒研究  

The research of particles carried by ascending gas flow from Qingmingshan Cu-Ni sulfide deposit in Guangxi Province

作　　者：李映葵 曹建劲[1,2] 陈杰[1,2] 易杰[1,2] 

机构地区：[1]中山大学地球科学与工程学院,广州510275 [2]广东省地质过程与矿产资源探查重点实验室,广州510275

出　　处：《岩石学报》2017年第3期831-842,共12页Acta Petrologica Sinica

基　　金：国家高技术研究发展计划("863"计划)项目(2008AA06Z101);国家自然科学重点基金项目(41030425)联合资助

摘　　要：为探讨上升气流微粒与深部隐伏矿体之间关系,在广西清明山铜镍硫化物矿床上方土壤中采集上升气流微粒,并采用透射电子显微镜(TEM)对微粒的形貌、大小、聚合状态、化学组分及结构等进行分析。结果表明,微粒主要由Cu、Co、Zn、Fe、Ca、Si、S等元素组成,其中成矿元素Cu、Co以自然Cu-Fe-Co、Zn-Fe-Co及Fe-Co合金微粒的形式存在,其余如Fe、Ca、Si、S等元素则以氢氧化物、氧化物及碳酸盐微粒形式存在。微粒可分为微粒聚合体及单个微粒,微粒的大小为50~500nm,微粒的形状多为不规则状、近椭圆形、近球状、水滴状和近长方体等。微粒中高含量的Cu、Co、Zn来源于深部隐伏矿体,含Fe、S微粒来源于矿床中金属硫化物矿物。此外,高价态的微粒组分指示微粒处于相对氧化的环境。清明山铜镍硫化物矿床的上升气流微粒组分与矿床矿物组分间存在着较好的对应性,本研究为隐伏铜镍硫化物矿床提供了新的找矿方法。In order to explore the relationship between particles carried by ascending gas flow and concealed ore bodies,particles carried by ascending gas flow were collected in the soil above Qingmingshan Cu-Ni sulfide deposit in Guangxi Province. The morphology,size,aggregation,chemical component and structure were analyzed by using transmission electron microscopy（ TEM）.The results reveal that particles are mainly composed of Cu,Co,Zn,Fe,Ca,Si and S,the ore-forming elements like Cu and Co may be in the form of natural Cu-Fe-Co,Zn-Fe-Co and Fe-Co alloy,the others like Fe,Ca,Si and S are mainly in the form of hydroxide,oxide and carbonate. Particles can be divided into particle aggregations and individual particles,and sizes of particles range from 50 nm to 500 nm. The shapes of particles are irregular,nearly elliptical,nearly spherical,drop-shaped and nearly rectangle. The detection of Cu,Co,Zn-bearing particles with high element content shows that Cu,Co and Zn in particles are relevant to deep concealed ore body.Fe,S-bearing particles may come from metal sulfide minerals in the deposit. In addition,particles components with high valence state indicate that particles exist under the oxidation conditions. Particles carried by ascending gas flow in Qingmingshan Cu-Ni sulfide deposit have a good correspondence with mineral component in the mine area,and this research may provide a new prospecting method for concealed Cu-Ni sulfide deposits.

关 键 词：铜镍硫化物矿床 上升气流 微粒 隐伏矿床 

分 类 号：P611[天文地球—矿床学]