泽错大型锂矿盐湖的物质来源及低矿化度成因

The Material Source and Low Salinity Genesis of Large Lithium Deposit Brine in Zecuo Lake

泽错盐湖为近年来西藏自治区发现的又一大型锂矿盐湖。基于泽错盐湖详查工作,通过采用遥感解译、地表和湖水卤水水化学调查及固体化学分析等手段,对泽错盐湖大型锂矿的成矿矿物质来源及低矿化度成因进行研究,结果表明:泽错湖水水化学类型为硫酸钠亚型,矿化度40.06 g/L,为低矿化度盐湖;卤水中LiCl品位434.10 mg/L,达到工业品位,LiCl资源量130.13×10^(4)t,资源量达到大型矿床规模;泽错盐湖的成矿物质来源主要有:1)岩浆岩;2)水热活动强烈的深大断裂附近的地下深部物质;3)湖盆第四纪沉积物内的地表物质。泽错盐湖低矿化度成因是湖区所处的气候条件、水盐均衡状态失衡及地貌条件共同作用的结果。为盐湖锂矿成矿研究提供了重要的基础资料,有助于丰富盐湖锂矿成矿理论。

Zecuo Salt Lake is a newly discovered and large-scale Li-rich salt lake in Xizang Autonomous Region in recent years.Based on the detailed investigation of Zecuo Salt Lake,we studied the material source of lithium and the orgin of low salinity of Zecuo Salt Lake using remote sensing interpretation,surface recharge and lake water investigation,and chemical analysis of solids.The results show that the hydrochemical type of Zecuo lake is sodium sulfate subtype,and the salinity is 40.06 g/L,which indicate Zecuo is a low salinity salt lake.The concentration of Li in the brine is 434.10 mg/L,reaching the industrial grade.The LiCl resource is around 1.3 million tons,reaching the scale of large-scale deposits.The ore-forming materials of Zecuo Salt Lake mainly come from:1)magmatic rocks;2)geep underground materials near deep and large faults with strong hydrothermal activity;3)surface materials in Quaternary sediments of lake basin.The low salinity of Zecuo Salt Lake results from climate change,the imbalance of water and salt balance and the geomorphic conditions in the lake catchment.This paper provides the important data for the study of lithium mineralization in salt lake,and contribute to enrich the theory of salt lake lithium mineralization.