柴达木盆地盐湖锂同位素地球化学特征及其物质来源和富集规律研究

Lithium was an important strategic resource for lithium batteries and controlled nuclear fusion, which attracted much attention. Lithium resources in saline Lake of Qaidam Basin accounts for about 80 percent of China's total lithium in brine. In recent years the study of lithium in saline Lake was mainly concentrated separation and extraction process of magnesium and lithium from high Mg/Li salt brine. However, the source, enrichment, lithium anomaly of the Oil field brines in the typical area of Western Qaidam Basin, the positive correlation between lithium and boron isotopic and significance of this positive correlation has been controversial. In this project, the brine, source water, sediments and oil field brines in lithium-rich salt lake of Qaidam Basin were collected and analyzed. The distribution, migration, the link between lithium and boron will be revealed. The project will provide geochemical theoretical basis by using lithium-boron concentrations and their isotopes. and provide recommendations for the region Salt Lake lithium, potassium, boron sustainable exploitation.

锂作为一种重要战略资源，可用于锂电池和可控核聚变，因而备受关注。柴达木盆地盐湖锂资源约占我国卤水锂资源总量的80%。近年来盐湖锂的研究主要集中于高Mg/Li比卤水锂的分离提取工艺，对该富锂地区锂的物质来源、富集规律、盆地西部油田卤水中锂异常、卤水锂和硼同位素正相关的机制及其指示意义存在争议或待明晰。因此本申请拟选取柴达木盆地重要富锂盐湖（别勒滩盐湖、台吉乃尔盐湖、大小柴旦盐湖等）和盆地西部油田水为研究对象，重点采集湖表卤水、晶间卤水、沉积物、补给水（河流水、温泉水）、油田卤水等。对采集样品进行锂、硼元素及同位素测定，阐明锂元素在空间上的分布、迁移与集散规律；利用不同端元锂同位素差异，区分不同来源锂对盐湖和油田水中锂同位素组成变化的贡献率；根据矿物化学组成，探讨其与锂、硼和钾等成盐元素间相互关系，为研究盐湖资源的成矿规律提供科学依据，同时为该地区盐湖锂、钾、硼矿床的可持续开采提供建议。

锂作为一种重要战略资源，可用于锂电池和可控核聚变，因而备受关注。柴达木盆地盐湖锂资源约占我国卤水锂资源总量的80%。该地区锂资源可持续开发受制于锂的物质来源和富集规律待明晰。因此本项目选取柴达木盆地重要富锂盐湖（别勒滩盐湖、台吉乃尔盐湖、大小柴旦盐湖等）为研究对象，重点采集湖表卤水、晶间卤水和油田卤水等。对采集样品进行锂、硼元素及同位素测定，研究结果表明，柴达木盆地盐湖锂含量，有三个典型的分区，一里坪为中心区域的锂含量为柴达木盆地最高值，柴达木盆地盐湖的东部和西部要较为低一些；柴达木盆地盐湖锂同位素变化范围比较大，从8.38‰到40.66‰之间变化。柴达木盆地北部的大小柴旦湖与中南部东台，主要来自祁连断裂带富含锂的泥火山和地下水有关。一里坪地区的主要与中新世火山沉积和地热活动相关。这些研究为盐湖资源的成矿规律提供科学依据，同时为该地区盐湖锂、钾、硼矿床的可持续开采提供基础科学支撑。