湘东北仁里-传梓源5号伟晶岩脉云母和长石成分的演化与成矿作用的关系
Received:June 04, 2019  Revised:June 24, 2019  点此下载全文
引用本文:YANG Han,CHEN ZhenYu,LI JianKang,LI Peng,XIONG Xin,WANG Zhen,ZHOU FangChun.2019.Relationship between the mineralization and the evolution of mica and feldspar components of Renli-Chuanziyuan No. 5 Pegmatite, northeast Hunan[J].Mineral Deposits,38(4):851~866
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Author NameAffiliationE-mail
YANG Han MNR Key Laboratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China  
CHEN ZhenYu MNR Key Laboratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China czy7803@126.com 
LI JianKang MNR Key Laboratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China  
LI Peng MNR Key Laboratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China  
XIONG Xin MNR Key Laboratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China  
WANG Zhen MNR Key Laboratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China  
ZHOU FangChun No.311 Geological Party of Hunan Nuclear Geology, Changsha 410011, Hunan, China  
基金项目:本文得到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)和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
中文摘要: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。
中文关键词: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
 
Relationship between the mineralization and the evolution of mica and feldspar components of Renli-Chuanziyuan No. 5 Pegmatite, northeast Hunan
Abstract: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.
keywords:geochemistry  rare metal pegmatite  mineralogy  chemical composition  Renli-Chuanziquan niobium-tantalum deposit
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