江西九岭复式岩体南缘白水洞花岗岩型锂矿床锂的赋存状态  

Occurrence of Lithium in the Baishuidong Granite-Hosted Lithium Deposit,Southern Margin of the Jiuling Mountain,Jiangxi Province

作　　者：刘爽 王水龙 LIU Shuang;WANG Shui-Long(Ecological Geology Brigade,Jiangxi Bureau of Geology,Nanchang 330025,Jiangxi,China;East China University of Technology,Nanchang 330013,Jiangxi,China)

机构地区：[1]江西省地质局生态地质大队,江西南昌330025 [2]东华理工大学,江西南昌330013

出　　处：《华南地质》2025年第1期96-108,共13页South China Geology

基　　金：江西省科学技术厅“科技+”联合计划项目(2023KDG01005)。

摘　　要：白水洞锂矿床是江西九岭复式岩体南缘巨型花岗岩型锂矿集区代表性矿床之一,以品位高和规模大为特征,但锂的赋存状态仍缺乏研究。本文通过化学分析、光学显微镜、扫描电镜(SEM)、电子探针(EPMA)和激光剥蚀等离子体质谱(LA-ICPMS)等方法,对该矿床矿石矿物组成、矿物的嵌布特征和成矿元素的赋存状态等进行了详细研究。结果表明,白水洞矿床矿石主要岩性为中细粒钠长石化白云母花岗岩,Li_(2)O平均品位0.51%;白水洞花岗岩属于过铝质钙碱性系列,矿石主要含锂矿物为锂白云母和锂云母,占矿石矿物总量的18%,云母中Li_(2)O含量变化较大(0.821%~5.086%),还有少量锂赋存在铁锂云母、磷锂铝石和锂绿泥石中,磷锂铝石含有较高的Li_(2)O(平均9.585%),但在矿石中分布极不均匀。本研究为后续合理确定选矿工艺提供了参考依据;白水洞矿床磷锂铝石和锂云母的出现指示甘坊岩体为高度演化的岩体,因此,在今后九岭地区的锂矿找矿勘查工作中应关注此类岩体。The Baishuidong lithium deposit is a representative example within the extensive granitic lithium deposit cluster located on the southern margin of the Jiulian Mountains,characterized by its high grade and large scale,yet the occurrence state of lithium remains unknown.This paper presents a comprehensive study utilizing various methods including chemical analysis,optical microscopy,scanning electron microscopy(SEM),electron probe microanalysis(EPMA),and laser ablation inductively coupled plasma mass spectrometry(LA-ICP-MS)to investigate the ore mineral composition,dissemination characteristics of minerals,and the occurrence state of lithium within this deposit.The findings disclose that the ore-related lithology at Baishuidong is medium-fine-grained albitized muscovite granite,with an average Li_(2)O grade of 0.51%.The Baishuidong granite is categorized as belonging to the peraluminous calc-alkaline series.The main lithium-bearing minerals in the ore comprise lepidolite and Li-muscovite,which altogether account for 18% of the total ore minerals. Notably, the Li_(2)O content in mica varies significantly, ranging from 0.821% to5.086%. Additionally, trace quantities of lithium are detected in zinnwaldite, montebrasite, and cookeite;montebrasite shows a relatively high average Li_(2)O content of 9.585%, although its distribution within the oreis highly uneven, this provides a reference basis for the subsequent rational determination of the beneficiationprocess.. The existence of amblygonite and lepidolite in the Baishuidong deposit indicates that the Ganfangpluton is highly evolved. In the future, attention should be paid to such plutons in the lithium ore prospectingand exploration in the Jiuling area.

关 键 词：花岗岩型锂矿 矿物学 赋存状态 白水洞 九岭 

分 类 号：P618.71[天文地球—矿床学]