湖南鸭公塘铜铅锌硫多金属矿床地下水纳米微粒特征研究  

Study of Nanoparticles in Groundwater of Yagongtang Cu-Pb-Zn-S Polymetallic Deposit,Hunan Province

作　　者：陆美曲 曹建劲 米一波[1,2,3,4] 刘翔 胡乖 Lu Meiqu;Cao Jianjin;Mi Yibo;Liu Xiang;Hu Guai(School of Earth Sciences and Engineering,Sun Yat-sen University,Guangzhou 510275,China;Guangdong Provincial Key Laboratory of Mineral Resources and Geological Processes,Guangzhou 510275,China;Guangdong Provincial Key Labo ratory of Geodynamics and Geohazards,Guangzhou 510275,China;Southern Laboratory of Ocean Science and Engineering(Zhuhai),Zhuhai 519000,China)

机构地区：[1]中山大学地球科学与工程学院,广东广州510275 [2]广东省地质过程与矿产资源探查重点实验室,广东广州510275 [3]广东省地球动力作用与地质灾害重点实验室,广东广州510275 [4]南方海洋科学与工程广东省实验室(珠海),广东珠海519000

出　　处：《金属矿山》2020年第3期143-153,共11页Metal Mine

基　　金：国家自然科学基金项目(编号:41473040,41873044,41030425)。

摘　　要：以湖南省鸭公塘铜铅锌硫多金属隐伏矿床地下水样品为研究对象,并选取广东省肇庆市白土盆地的地下水作为背景样,利用透射电镜(TEM)原位液体芯片观察到地下水纳米微粒的原始状态,再分析它们的元素种类、组合及比值等特征。分析结果表明:地下水纳米微粒常以单颗粒(粒度为50~500 nm)和聚合体两种形式存在,并以聚合体为主。其中矿床地下水微粒主要含有Ag、Cu、Fe、Pb、Zn等元素,元素组合形式主要有Zn-Cu-Fe、PbFe-Cu、Pb-Cu-Zn等,与矿床成矿元素组合一致。背景区地下水纳米微粒主要含有地壳常见元素,元素组合未见异常。通过对比两地地下水纳米微粒特征可知,矿床地下水含金属纳米微粒与深部隐伏矿体关系密切。此外,所捕获的矿床地下水纳米微粒多具有形态方面棱角分明、组成物质中金属硫酸盐含量高且金属氧化物价态高等现象,结合该矿区断层发育的特点,推测断层作用和氧化作用是鸭公塘矿床地下水纳米微粒形成的主要方式。由于纳米微粒能通过载体地下水迁移,并能很好地反映隐伏矿体信息,说明通过地下水纳米微粒特征探测隐伏矿体是可行的,对于深部资源探测具有指示意义。The groundwater samples from the Yagongtang Cu-Pb-Zn-S polymetallic concealed deposit,Hunan province were collected.For comparison,background groundwater samples were collected from the Baitu basin of Zhaoqing,Guangdong Province.Nanoparticulate features in groundwater were proven in in-situ liquid chip via transmission electron microscopy(TEM),and their composition,elemental combination and atomic ratio were also recorded and shown.According to the results,nanoparticles in groundwater occur as individual particles(with the size of 50~500 nm)and particle aggregates,and the latter ones were most common.The nanoparticles collected from the deposit contained ore-forming elements such as Ag,Cu,Fe,Pb,and Zn.The elemental combinations mainly include Zn-Cu-Fe,Pb-Fe-Cu and Pb-Cu-Zn,which were consisted with those of the deposit.On the other hand,the nanoparticles collected from the background area contained common elements of the crust,exhibiting little elemental combination of anomaly.It is concluded that the nanoparticles detected in groundwater from the deposit were strongly linked to the concealed orebodies.In addition,the nanoparticles collected from the deposit was commonly characterized of sharp edges and high content of metal-bearing sulfate,existing as metal oxide in the form of high valent state,and feature of fault development in the mining area.Therefore,faulting and oxidation were predominantly responsible for the formation of the nanoparticles in groundwater of the Yagongtang deposit.Since nanoparticles can be transported by groundwater and efficiently reflect information of the concealed orebodies,thus utilizing nanoparticles in groundwater for the exploration of concealed orebodies is feasible,which further provide a vital indication for detecting the deep-lying mineral resources.

关 键 词：地下水 透射电镜 纳米微粒 鸭公塘矿床 隐伏矿床勘探 

分 类 号：P641.4[天文地球—地质矿产勘探]