| The Laguocuo salt lake is located in Mami Township, Gaize Country, Ngari Prefecture, Xizang. It is one of the modern lake surface brine mines that bearing various mineral resources. Lithium, boron, rubidium, and cesium in them have reached a large scale. In this research, we conducted hydrochemical analysis on the surface and ground water of Laguocuo, and obtained detailed data. The data reveal that the content of Li up to 1.16 mg/L for Suomeizangbu river, which is 4.2 times of that in Xiongbuka river. Combined with the remote sensing and geological features of catchment area, it is suggested that the Suomeizamgbu river valley is a Holocene active fault occurring with thermal springs, and is a regional geothermal activity zone. Hydrothermal activities are responsible for the high Li concentrations in the Suomeizangbu river. Moreover, the groundwater in the Jibuchaka lake basin is supplied to Laguocuo by underground seepage via the fault between the two lakes and the H8 and H9 confluence areas. The analysis on the characteristics of water supply and discharge balance of Laguocuo manifest that it is currently in a state of water supply and discharge balance, and the amount of supply is slightly higher than the discharge. This interpretation is identical with the local expansion of Laguocuo in recent years. Based on calculating the water salt balance and data from this study, the annual amount of Li, K, B2O3, Rn, and Cs supplied into the Laguocuo salt lake is 145.49t, 1541.87t, 2292.3t, 7.31t, and 15.1t, respectively. The Suomeizangbu supplied 111t Li per year, accounting for 76% of the total Li, and hence are identified as the main source of Li for Laguocuo. |