摘要
5号稀有金属伟晶岩脉是仁里-传梓源矿区规模最大的伟晶岩脉,地表分带性良好。文章选取仁里5号脉深部钻孔开展矿物学研究,研究其深部的分带规律。根据对深部钻孔(ZK708)岩芯的矿物学特征研究认为,5号伟晶岩脉深部可划分为4个带:Ⅰ、Ⅱ、Ⅲ、Ⅳ带。Ⅰ带主要为微斜长石和石英,典型特征为文象结构;Ⅱ带主要为微斜长石和钠长石;Ⅲ带主要为钠长石和白云母;Ⅳ带主要为钠长石和石榴子石。云母和长石的成分特征显示,从外带(Ⅰ、Ⅱ带)至内带(Ⅲ、Ⅳ带)云母由白云母系列逐渐向锂云母系列转变;由Ⅰ带→Ⅱ带→Ⅳ带→Ⅲ带,云母中的Li、F、Cs、Ta、Sn、Nb含量升高,Sr、Ba含量下降;钾长石的中Li、Rb、Cs呈现类似的上升趋势,指示伟晶岩分异演化程度升高。碱性长石中P的含量呈现出由Ⅰ~Ⅱ带略微降低,Ⅲ带升高而Ⅳ带呈略微降低的趋势,Ⅲ带内发育铌钽铁矿,表明P元素的升高可能与铌钽的富集密切相关。
The No. 5 rare metal pegmatite is the largest pegmatite in the Renli mining area. It shows obvious regularity at surface, but its distribution in the depth is unclear. In view of such a situation, the authors carried out a detailed investigation into the mineralogy of the deep rock mass of Renli No.5 pegmatite. No.5 pegmatite in the deep drill hole (ZK708) can be divided into 4 zones according to mineralogical characteristics: i.e.,Ⅰ,Ⅱ,Ⅲ and Ⅳ. Zone Ⅰ is mainly composed of microcline and quartz, and its typical feature is graphic texture;Zone Ⅱ is mainly composed of microcline and albite;Zone Ⅲ is mainly composed of albite and muscovite;Zone Ⅳ is mainly composed of albite and garnet. Mica and feldspar composition characteristics show that, from the outer zone (Zone Ⅰ and Ⅱ) to the inner zone (Zone Ⅲ and Ⅳ), mica gradually changes from muscovite series to lithium mica series. In order of Zone Ⅰ→ Zone Ⅱ→ Zone Ⅳ→ Zone Ⅳ, the values of Li, F, Cs, Ta, Sn and Nb in mica increase,while the values of Sr and Ba decrease. The values of Li, Rb and Cs in K-feldspar show similar upward trend, indicating the increasing evolution degree of pegmatite. The content of P in alkaline feldspar shows a slight decrease from Zone Ⅰ to Zone Ⅱ, and it slightly increases in Zone Ⅲ and slightly decreases in Zone Ⅳ;columbotantalite minerals are distributed in Zone Ⅲ, indicating that the increase of P may be closely related to the enrichment of niobium and tantalum.
作者
杨晗
陈振宇
李建康
李鹏
熊欣
王臻
周芳春
YANG Han;CHEN ZhenYu;LI JianKang;LI Peng;XIONG Xin;WANG Zhen;ZHOU FangChun(MNR Key Laboratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources,Chinese Academy of Geological Sciences, Beijing 100037,China;No. 311 Geological Party of Hunan Nuclear Geology,Changsha 410011,Hunan,China)
出处
《矿床地质》
CAS
CSCD
北大核心
2019年第4期851-866,共16页
Mineral Deposits
基金
湖南省国土资源厅科研项目（编号：2018-02）
湖南省地勘基金项目（编号：20170331）
湖南省核工业地质局科研基金（编号：KY2016-311-01）
中央级公益性科研院所基本科研业务费（编号：JYYWF201814）
国家自然科学基金项目（编号：41872096）
中国地质调查局项目“华南稀有稀土稀散矿产调查”（编号：DD20160056）联合资助
关键词
地球化学
稀有金属伟晶岩
矿物学
化学成分
仁里-传梓源铌钽矿
geochemistry
rare metal pegmatite
mineralogy
chemical composition
Renli-Chuanziquan niobium- tantalum deposit
