西藏拉果错盐湖周边汇水域水化学特征及盐类矿物补给特征OA

The Laguo Co salt lake,located in Mami Township,Gaize Country,Ngari Prefecture,Tibet,is one of the modern lake surface brine mines bearing various mineral resources.Lithium,boron,rubidium,and cesium have reached to a large scale.In this study,we conducted hydrochemical analysis for the surface and ground water from Laguo Co,and obtained detailed data.The data revealed that Li contents of the Suomeizangbu River ranging up to 1.16 mg/L,which is 4.2 times that of South of Xiongbuka River.Also considering the remote sensing and geological features of the catchment area,it is suggested that the Suomeizangbu River valley is a Holocene active fault zone with thermal springs and 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 Laguo Co through underground seepage via a fault between the two lakes,in the H8 and H9 confluence areas.The analysis of the characteristics of the water supply and discharge balance of Laguo Co indicate that it is currently in a state of water supply and discharge balance;however,the amount of supply is slightly higher than the discharge.This interpretation is consistent with the recent local expansion of Laguo Co basin.Based on the water-salt balance calculation and data from this study,the annual amounts of Li,K,B2O3,Rb,and Cs supplied to the Laguo Co Salt Lake under the current hydrological conditions are 145.49 t,1 541.87 t,2 292.3 t,7.31 t,and 15.1 t,respectively.The Suomeizangbu supplies 111 t Li per year,accounting for 76%of the total,and hence is the main source of Li for Laguo Co.