科研之友
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摘要
Kushui lake is a newfound lithium-rich salt lake in the West Kunlun Mountain hinterland of Tibetan plateau. It is of great significance to find out the characteristics of hydrochemical composition for enriching the basic data of the Li-rich brines deposits on the Tibetan plateau. However, limited by the regional physical and geographical conditions, the basic research on the brine and recharge water system of the salt lake has not been reported yet. Piper diagram, Gibbs diagram and ion ratio analysis method were comprehensively used to discuss the chemical composition, evolution and main ion sources of the surface brine and the peripheral recharge system. The results show that from "source" to "sink", not only the composition of each ion is changed significantly but also the hydrochemical type shows transition from carbonate-type to sodium sulfate subtype, and the evolution of hydrochemistry in water changes from rock weathering control to evaporation crystallization control. According to the ion content ratio relationship, three main ion sources were identified. (1)The weathering products of carbonate and silicate are the main solute in the recharge water system of northeastern Kushui lake. (2)The Tianshui lake recharge water system in the southern part of the lake mainly supplies evaporate dissolved substances. (3)There may be solute sources in the cold spring around the lake from mixed fluid of syn-sedimentary brine and shallow groundwater, or the leaching products of felsic volcanic rocks and carbonatite.
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单位黄土与第四纪地质国家重点实验室; 中国科学院大学
