赣南地区伟晶岩型锂矿资源禀赋特征与找矿新进展

Resource endowment characteristics and prospecting progress of pegmatite type lithium mine in southern Jiangxi province

锂被誉为21世纪绿色高能金属。本文分析了赣南地区伟晶岩型锂矿资源禀赋与新发现的含锂磷酸盐矿物“磷锂铝石”的特征。从分析典型矿床特征和锂资源的空间分布入手,对比典型矿床“锂辉石”与新发现“磷锂铝石”特征,以及“典型矿床异常”与“新发现锂异常”特征,分析含锂伟晶岩脉的矿物组合及分带性等。研究认为:赣南地区伟晶岩型锂矿床主要分布于加里东期酸性侵入岩(会同岩体)的外接触带上,赋矿地质体为花岗伟晶岩脉,主要控矿构造为NE向和NEE向张性裂隙、加里东期紧闭褶皱转折端虚脱构造,含锂矿物主要为锂辉石及磷锂铝石。本次工作发现了“磷锂铝石”和“胜和找矿远景区”,并预测该地区Li 2O潜在资源量为15.36万t,对拓展武夷山成矿带南部锂矿后续的找矿方向有重要指示意义。

Lithium is praised as the green high energetic metal in the 21st century.This paper analyze the endowment characteristics which a newly discovered“lithium-bearing phosphate mineral”(amblygonite)in southern Jiangxi province,and summarized the geological characteristics of typical deposit and spatial distribution of lithium resources,and compare the characteristics of typical deposit“spodumene”and newly discovered“lepidolite”,as well as the characteristics of“typical deposit anomaly”and“newly discovered lithium anomaly”,and analyzes the mineral assemblage and zonation of lithium-bearing pegmatite veins.The analysis results show that the pegmatite type lithium deposits are mainly distributed in the external contact zone of the Caledonian intrusive rock(Huitong rock),and the ore-bodies are granitic pegmatite dikes,and the ore-controlling structures are mainly NE-trend and NEE-trend tensile cracks and turn end collapse structures of the Caledonian tight folds.The dominant lithium-bearing minerals are spodumene and amblygonite.The work discovers the“phosphorite”and“Shenghe prospecting prospect”,and the potential resources of Li 2O are predicted to be 153.6 kiloton.It is of great significance to expand the subsequent prospecting direction of lithium ore in the southern Wuyishan metallogenic belt.