福建永定大坪铌钽矿床地质特征及铌钽矿物特征研究  

Study on geological characteristics and mineral feature of Daping Nb-Ta deposit in Yongding County of Fujian Province

作　　者：江善元[1] JIANG Shanyuan(The 2nd Geological Prospecting Institute of China Metallurgical Geology Bureau,Fuzhou 350108,Fujian,China)

机构地区：[1]中国冶金地质总局第二地质勘查院

出　　处：《矿产与地质》2019年第4期581-590,共10页Mineral Resources and Geology

基　　金：中国地质调查局地质大调查项目“大宗急缺矿产和战略性新兴产业矿产调查”工程“我国三稀资源战略调查”、“稀有稀土稀散矿产调查”项目（编号：1212011220804）之子项目“福建永定—南平地区稀有、稀土矿调查评价”（编号：12120113078300）资助

摘　　要：福建永定大坪铌钽矿赋存于潜火山岩相碱长花岗斑岩内,主要有用组分为铌钽,矿石中铌钽品位达到工业指标要求。矿床具有埋藏浅和全岩矿化的特点,规模达大型以上。应用扫描电镜、电子探针、X-ray能谱分析、MLA矿物检测、光学显微镜等方法,对大坪铌钽矿中铌钽矿物特征进行了研究。研究结果表明:铌铁矿-钽铁矿类质同象系列矿物,是该矿石中钽铌主要的赋存矿物,呈自形—半自形针状、粒状、不规则状,大多为单矿物呈浸染状或其聚集体呈稀疏星点状分布于矿石中,少量细晶石含铌钽金红石。矿石中钽铌矿物粒度细小,平均粒度钽铌铁矿约80μm、细晶石约13μm、含钽铌金红石约14μm。类比宜春钽铌矿床,可能具有一定的可选性。Yongding Daping Nb-Ta deposit is hosted in the alkaline granite porphyry of subvolcanic face,in which Nb-Ta minerals are the main useful components.The Nb 2 O 5 and Ta 2 O 5 grades reach the requirement of industrial index standard.The deposit exceeds the large scale with the feature of shallow buried depth and whole rock mineralization.The Nb-Ta minerals are studied in Daping Nb-Ta deposit with the application technology and methods of scanning electron microscope,electron probe,X-ray spectrum analysis,MLA Mineral monitoring,optical microscope.The research result shows that the main Nb-Ta-hosted minerals are the isomorphism series of the niobite-tantalite minerals,which are presented in semi-idiomorphic-idiomorphic acicular,and in grain and irregular shape.Mostly,the single mineral is disseminated or the aggregate is sparsely star-spot-distributed in the ore,and that a small amount of Nb-Ta-hosted minerals are microlite and Nb-Ta rutile.The Nb-Ta mineral granularity is very small,and the average grain sizes of niobite-tantalite iron ore and microlite and Ta-Nb-bearing rutile are 80μm,13μm and 14μm,respectively.Analogized to Yichun Ta-Nb deposit,Daping Nb-Ta deposit might have the definite washability.

关 键 词：大坪铌钽矿床 铌钽矿物 永定 福建 

分 类 号：P618.79[天文地球—矿床学] P618.86[天文地球—地质学]