大庄铌钽矿地质特征及找矿方向  

Geological Characteristics and Prospecting Direction of Dazhuang Niobium-tantalum Deposit

作　　者：李国建[1] LI Guojian(The First Geological Exploration Institute of Henan Provincial Bureau of Geo-exploration and Mineral Development)

机构地区：[1]河南省地质矿产勘查开发局第一地质勘查院,河南省郑州市450001

出　　处：《现代矿业》2021年第8期37-40,97,共5页Modern Mining

基　　金：中国地质调查局地质大调查项目(编号:1212011121013)。

摘　　要：大庄铌钽矿床位于二郎坪岛弧带,中国铌钽成矿区带—秦岭成矿带,依托河南省铌钽矿潜力资源评价项目,在整理分析1∶5万地质调查、1∶1万地质测量、1∶20万重力测量、1∶20万重砂测量、1∶20万水系沉积物测量、槽探及坑探等资料的基础上,总结成矿规律,进行成矿预测,构建成矿模型。结果发现,①大庄铌钽矿床为花岗伟晶岩型铌钽矿;②花岗伟晶岩脉主要沿二郎坪群大理岩与五垛山花岗岩接触带分布;③花岗伟晶岩脉中铌、钽、锂、铍等稀有矿物矿化普遍,铌钽矿物主要分布在具钠长石化的长石单矿物结构带内;④伟晶岩型铌钽矿均分布在剩余重力高值异常条带中,且主要沿朱夏断裂带对应的重力梯度模异常带分布;⑤前后共发现了K235、K226、K178、K90、K16、K45共6条矿脉,其中K16规模较大;⑥初步圈定了找矿靶区。综合研究区内成矿地质条件、成矿物质来源,认为该区中深部具有较大找矿潜力。Dazhuang niobium-tantalum deposit is located in Erlangping island arc belt,Qinling metallogenic belt of niobium-tantalum metallogenic belt in China.Based on the potential resource evalua⁃tion project of niobium-tantalum deposit in Henan Province,the metallogenic regularity is summarized,the metallogenic prediction is carried out and the metallogenic model is constructed on the basis of sorting and analyzing the data of 1∶50000 geological survey,1∶10000 geological survey,1∶200000 gravity sur⁃vey,1∶200000 heavy sand survey,1∶200000 stream sediment survey,trenching and pit exploration.The results show that:①The Dazhuang niobium-tantalum deposit is granitic pegmatite type niobium-tantalum deposit.②The granitic pegmatite veins are mainly distributed along the contact zone between marble of Er⁃langping Group and Wuduoshan granite.③Mineralization of rare minerals such as niobium,tantalum,lithi⁃um and beryllium is common in granitic pegmatite veins,and niobium and tantalum minerals are mainly distributed in the feldspar single mineral structure belt with albitization.④The pegmatite-type niobium-tan⁃talum deposits are all distributed in the high residual gravity anomaly belt,and are mainly distributed along the gravity gradient anomaly belt corresponding to the Zhuxia fault zone.⑤Before and after the discov⁃ery of K235,K226,K178,K90,K16,K45 a total of six veins,of which K16 larger.⑥The prospecting target area was preliminarily delineated.Based on the comprehensive study of metallogenic geological condi⁃tions and metallogenic material sources in the study area,it is considered that the middle and deep parts of the area have great prospecting potential.

关 键 词：铌钽矿 成矿要素 成矿模式 

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