察尔汗盐湖主要补给水体不同温度下水文地球化学模拟初步研究

Preliminary Study on Hydrogeochemical Simulation of Main Supplying Waters under Different Temperature Conditions in the Qarhan Salt Lake

中文关键词:  察尔汗盐湖  EQL/EVP程序  水文地球化学模拟  蒸发析盐规律  杂卤石

英文关键词:Qarhan Salt Lake  EQL/EVP program  Hydrogeochemical simulation  Law of evaporation and salt precipitation  Polyhalite

中文摘要:

      察尔汗盐湖是世界上最典型的现代陆相盐湖之一，该盐湖的成盐流体演化过程迄今尚存在较大争议。利用 EQL/EVP水文地球化学模拟软件，对察尔汗盐湖主要补给水系在不同温度条件下进行了蒸发析盐实验模拟。研究结果表明，察尔汗北部深部卤水蒸发析出的盐类矿物与察尔汗盐湖地层中盐类矿物差异性很大。但格尔木河水则具有较好的一致性，在一些盐类矿物含量(如杂卤石)上与察尔汗地区实际情况存在明显差异，不同温度下模拟析出的盐类矿物组成存在一定差别。研究揭示出深部卤水和格尔木河水均是察尔汗盐湖的补给源之一，格尔木河水是主要物源但也并非唯一来源，察尔汗盐湖是多源流体混合掺杂作用的结果。模拟演化结果显示，深部卤水和格尔木河水中硼和锂均随蒸发作用呈现逐步增加的趋势，未见矿物析出，二者在蒸发过程中一直赋存在溶液中。

英文摘要:

      The Qarhan Salt Lake is one of the most typical modern continental salt lakes in the world，there is a controversial issue on the salt-forming fluids evolution. Using EQL/EVP hydrogeochemical simulation soft. ware，we simulates the single evaporation and salt precipitation experiment of the main supplying water sys.tem of the Qarhan Salt Lake under different temperature conditions. The results show that the saline mineralsevaporated from the deep brine in the north of the lake are very different from those in the stratum of the Qar.han Salt Lake. Although the simulating results from the Golmud River waters have good consistency with sedi.ments in the lake，but there are obvious differences in contents of some saline minerals(such as polyhalite) between the simulation and the fact in the lake. Component of saline minerals from the simulation in differenttemperatures have some differences. It is revealed that both deep brine and the Golmud River are one of thesalt-supplying sources for the Qarhan Salt Lake. The Golmud River is the main source，but it is not the only. The formation of the Qarhan Salt Lake is the result of mixed result of multi-source fluids. The simulation also indicates that the boron and lithium in deep brine and the Golmud River water gradually increase with evapo.ration，and no boron-lithium-bearing saline mineral is precipitated. They always existed in solution during evaporation.