Hydrogeochemical and isotopic characteristics of spring water in the Yarlung Zangbo River Basin, Qinghai-Tibet Plateau, Southwest China  

作　　者：LI Ying-zhi GAO Zong-jun LIU Jiu-tan WANG Min HAN Cong 

机构地区：[1]School of Environmental Science and Engineering,Chang’an University,Xi’an,710054,China [2]Center for Hydrogeology and Environmental Geology Survey,China Geological Survey,Baoding,071051,China [3]College of Earth Science and Engineering,Shandong University of Science and Technology,Qingdao,266590,China [4]College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao,266590,China

出　　处：《Journal of Mountain Science》2021年第8期2061-2078,共18页山地科学学报（英文）

基　　金：supported by the Center for Hydrogeology and Environmental Geology Survey,China Geological Survey(112120114059601,DD20160298,2019QZKK020703,KKLFSE201304);the China Postdoctoral Science Foundation(2020M682207).

摘　　要：The Yarlung Zangbo River Basin(YZRB)is situated in the southern part of the Tibetan Plateau and remains in a mostly natural state.To understand the chemical characteristics of spring water and its controlling factors in the YZRB,68 sets of spring water samples were analyzed using hydrochemical and isotopic techniques.The spring water was found to be slightly alkaline with total dissolved solids(TDS)below 1000 mg L−1.Major ions were Mg2+,Ca2+,SO42−,and HCO3−.The spring water types in this basin were determined to be HCO3-Ca·Mg and SO4·Cl-Ca·Mg.Ion exchange and dissolution of carbonate,gypsum,and silicate were identified as the prevalent hydrogeochemical processes contributing and defining spring water chemistry in this basin.Saturation indices(SI)of most major minerals studied in this region were below zero,indicating that these minerals remain under-saturated in the spring water in this area.Overall,the rank of different processes in terms of their contribution to the chemical composition of spring water in the YZRB was carbonate weathering>evaporate dissolution>silicate weathering>precipitation input.The content of 18O in spring water ranged from−22.22‰to−14.08‰with a mean of−18.15‰.Samples collected below and close to the local and global meteoric water lines indicated that spring water in this area is derived from meteoric water with chemistry affected by evaporation.

关 键 词：HYDROCHEMISTRY Stable isotopes Spring water Controlling factors The Yarlung Zangbo River Basin 

分 类 号：P342[天文地球—水文科学]