大柴旦盐湖沿岸地下水向湖排放硼通量研究

The Boron content of Da Qaidam salt lake were the most all kinds of salt lake in the qaidam basin, become one of attention and development salt lake in the earliest due to Boron resources in the lake. Previous studies have poor understanding on some aspects such as the process of migration and enrichment about Boron, recharge mode of groundwater for Boron, and fluxs of Boron by groundwater discharge. However these aspects have very important theoretical significance to evaluate Boron resource and formation and evolution and mineralization of the salt lake resources. Aiming to fill this gap, Firstly we will collect all kinds of water samples , and testing Radium activities( 223Ra、224Ra、226Ra and 228Ra), hydrogen and oxygen isotope, concentration and isotope of Boron, we will analyze the composition and distribution characteristics and the relationship between them, combined meteorological and hydrological and water chemistry data, and then calculating the ratio of groundwater input to evaporation of salt lake, to confirm the source and sink of radium isotopes, setting up radium mass balance model for Da Qaidam salt lake, estimating the groundwater discharge rate and groundwater input of the salt lake, discussing the enrichment and migration process of boron with the groundwater, after that we will calculate the total flux of liquid Boron that enter into salt lake by groundwater discharge. This project will offer important evidence for the sustainable exploitation and balance use of Boron resources in Da Qaidam salt lake.

大柴旦盐湖卤水中硼含量居柴达木盆地各类盐湖之首，因其蕴藏硼矿资源成为我国最早被开发的盐湖之一。以往研究针对大柴旦盐湖液体硼的迁移富集过程、地下水补给模式及输入通量等方面的认识相对不足，而这对于大柴旦盐湖硼资源评价以及盐湖资源的形成、演化、成盐成矿具有重要的理论意义。本项目拟以镭同位素、氢氧同位素为分析手段，通过测试不同水体中镭同位素的活度值、氢氧同位素值、硼含量及其同位素值，分析其组成与分布特征以及它们之间的关系；结合水化学和水文气象数据，推算大柴旦盐湖地下水输入与蒸发之比，明确湖中镭同位素的源、汇项，建立盐湖镭的质量平衡模型和镭库模型，估算大柴旦湖沿岸地下水的排放速率和输入量；探讨硼随地下水迁移富集过程，进而推算通过地下水排放到大柴旦盐湖中的硼的总通量。本项目的实施可为大柴旦盐湖中硼资源可持续开发利用提供科学依据。

大柴旦盐湖卤水中硼含量居柴达木盆地各类盐湖之首，因其蕴藏硼矿资源成为我国最早被开发的盐湖之一。以往研究针对大柴旦盐湖液体硼的迁移富集过程、地下水补给模式及输入通量等方面的认识相对不足，而这对于大柴旦盐湖硼资源评价以及盐湖资源的形成、演化、成盐成矿具有重要的理论意义。本项目研究了不同水体中镭同位素的活、硼含量及其同位素值组成分布特征，明确了湖中镭同位素的源、汇项，建立盐湖多示踪剂耦合镭的质量平衡模型，估算了大柴旦湖沿岸地下水的排放速率和输入量以及通过地下水排放到大柴旦盐湖中的硼的总通量。本项目的实施可为大柴旦盐湖中硼资源可持续开发利用提供科学依据。