投稿时间：2019-06-04
修订日期：2019-06-24
网络发布日期：2019-08-26
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。
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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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
引用文本：
杨晗,陈振宇,李建康,李鹏,熊欣,王臻,周芳春.2019.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[J].矿床地质,38(4):851~866YANG 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 Deposits38(4):851~866
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