九岭式狮子岭岩体型稀有金属成矿作用研究进展及其找矿意义

赣西北是我国重要的稀有金属成矿区,成矿作用主要集中于武功山隆起和九岭隆起,其中的武功山隆起产有我国最大的岩体型稀有金属矿床414矿,在九岭隆起是否也能找到类似于414的大型稀有金属矿床成为业界关注的焦点。本文在华南稀有稀散和稀土矿产调查评价项目开展过程中,查明了赣西北九岭地区的狮子岭岩体也存在类似的稀有金属矿化,矿化主要赋存于黑磷云母—含锂白云母碱长花岗岩、锂(白)云母碱长花岗岩和黄玉锂云母碱长花岗岩三类岩石中,三类岩石的分带特点与武功山隆起雅山含矿岩体从Ⅴ带的二云母碱长花岗岩到Ⅱ带的黄玉—锂云母—钠长石花岗岩演变趋势有非常明显的相似性。同时,详细的矿物学研究表明,狮子岭岩体稀有金属矿化特征与414矿也存在一定差异,如狮子岭黄玉—锂云母碱长花岗岩中磷锂铝石超常富集,含量可到4%～5%,已成为矿石中锂的主要载体之一;岩体中绿柱石、富钽锡石、铌钽铁矿、钽铌铁矿等工业稀有金属矿物也普遍存在,这些发现为该地区Li、Be、Ta及Sn的找矿工作部署提供了直接依据。同时,文章对九岭地区锂矿资源的成矿潜力、成矿机制以及华南地区岩体型锂矿找矿方向进行了探讨,深化了稀有元素在花岗岩类中成矿作用的认识,对华南地区稀有金属的找矿工作可能也将产生积极的影响。

Progress of research on the Shilizing rare meatals mineralization from Jiuling- type rock and its significance for prospecting

The Northwest of Jiangxi is one of the most important rare metal metallogenic belts in China, and mineralization is mainly concentrated in Wugongshan uplift and Jiuling uplift. The 414 rare metal deposit, which located in the Wugongshan uplift, is the largest rock- tpye rare metal deposit in China. Whether a large- scale rare metal deposits similar to 414 can be found in Jiuling uplift has become the focus of the industry. This paper focus on the potential of the rare metal mineralization in Jiuling area and found that the mineralization characteristicsof Shiziling rock are similar to 414 deposit,especially on the lithofacies zonation. And there are also some differences. For example, the montebrasite in topaz- lithium mica alkali feldspar granite in Shiziling area is super- enriched with a content of 4%~5%, which has become one of the main carriers of lithium in ores. Other rare metal minerals such as beryl, tantalum rich cassiterite, columbite- tantalite, and tantalum niobium ore are also common in rock masses. These findings provide a direct basis for the prospecting deployment of Li, Be, Ta and Sn in this area. At the same time, this work discussed the metallogenic potential, metallogenic mechanism of lithium mine resources in Jiuling area and prospecting direction of rock mass type lithium deposits in South China, which may deepen the understanding of the mineralization of rare elements in granites, and also will have a positive impact on the prospecting of rare metals in South China.