【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。更多还原

【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. ZoneⅠ 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 Ⅰand 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.更多还原