江西省泰和县梅岗含锂卤水矿成矿地质特征及开发利用前景

Metallogenic Geological Characteristics and Prospect of Development and Utilization of Meigang Li-bearing Brine Deposit in Taihe County,Jiangxi Province

近年来,随着卤水提锂技术研究不断取得突破,卤水提锂的生产工艺日趋完善,卤水提锂将逐步成为开发生产锂盐的重要途径,卤水矿的勘查及开发利用将逐渐得到重视。江西省泰和县梅岗高盐富锂型地下卤水矿富含NaCl和LiCl,w(NaCl)为278 146~308 362 mg/L,含量最高值约为工业品位的2.6倍;w(LiCl)为611~1 136 mg/L,含量最高值约为工业品位的3.8倍,具有较大的工业价值。在归纳总结该矿区地质勘探成果的基础上,分析了该卤水矿的成矿地质特征、矿床成因及成矿物质来源。研究表明:(1)泰和县梅岗含锂卤水矿位于吉泰盆地东侧,产于白垩系地层中,其形成主要受沉积环境控制;(2)矿区卤水矿体主要赋存于晚白垩世上统周田组第1段红层中部,含盐系地层可划分为7层,其中,第3层和第6层为富锂饱和卤水的直接赋矿层位;(3)梅岗卤水矿的成因类型属陆源碎屑-化学岩型盐类沉积卤水矿床,成矿时代为晚白垩世;(4)矿区汇水盆地内的矿物岩石化学风化产物为成盐卤水化学物质的主要来源,梅岗卤水主体为沉积卤水深循环水及玄武岩活动补充锂的物质来源。在上述分析的基础上,进一步讨论了区内含锂卤水矿的开发利用前景,并提出了强化卤水锂资源开发、卤水锂资源开发中需注重综合利用、加强二次锂盐开发研究等建议。

In recent years,with the continuous study breakthrough of the improvement of lithium extraction technique in brine,the production process of lithium extraction is more and more perfect,lithium extraction in brine is gradually becoming the important way to the development and production of lithium salt,the prospecting and development and utilization of brine deposit will be paid more and more attention. The contents of Na Cl and Li Cl are high in Meigang high-salt and rich lithium type underground brine mine in Taihe County,Jiangxi Province,w（ Na Cl） 278 146 - 308 362 mg/L,the highest content of Na Cl is almost 2. 6 times of the industrial grade of Na Cl,w（ Li Cl） 611 - 1 136 mg/L,the highest content of Li Cl is almost 3. 8 times of the industrial grade of Na Cl,which show that the industrial value of the brine deposit is good. Based on the geological prospecting and exploration results of the mining area newly obtained in recent years,the metallogenic geological characteristics of the brine deposit is discussed,besides that,the deposit genesis and source of metallogenic materials are also discussed in detail. The study results show that：（1）Meigang Li-bearing brine deposit in Taihe County is located in the east of Jitai Basin,is is hosted in Cretaceous strata,the formation of the deposit is mainly controlled by sedimentary environment;（2）brine ore-bodies in the mining area are mainly distributed the middle of the first red layer of Zhoutian Formation of Late Cretaceous Upper Series,the salt-bearing layer can be divided into 7 layers,among them,the third and sixth layer are the direct ore-bearing layers of lithium rich saturated brine;（3）the deposit genesis of Meigang brine mine is belongs to the terrigenous clastic-chemical rock type salts sedimentary brine deposit,metallogenic epoch of the deposit is Late Cretaceous;（4）chemical weathering product of mineral rocks in the catchment basin in the mining area is the main source of chemical substances of salt brine,the most of Meigang brine is deep circulating water of sedimentary brine and the main material source of lithium in basalt activities. Based on the above discussion results in this paper,the prospect of development and utilization of Li-bearing brine deposit in the mining area is analyzed,besides that,in order to promote the prospecting and utilization of the brine deposit in the mining area,some related suggestion about strengthening the development of lithium brine resources,paying attention to the comprehensive utilization in the development of lithium brine resources and strengthening the study of the secondary development of lithium salt. The above discussion results related to the metallogenic geological characteristics and the prospect of development and utilization of Maigang Li-bearing brine deposit in Taihe County,Jiangxi Province can provide further meaningful reference for conduct further prospecting and development of the deposit in the mining area or its adjacent area.