Geochemical characteristics and source analysis of rare earth elements in Qinghai Lake sediments  

作　　者：Guangying Li Yingyi Meng Jinhan Zhou Di Ming Lijun Dai Lingqing Wang 

机构地区：[1]Qinghai Ecological Environment Planning and Environmental Protection Technology Center,Xining 810007,China [2]Key Laboratory of Land Surface Pattern and Simulation,Institute of Geographical Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China

出　　处：《Acta Geochimica》2025年第2期231-246,共16页地球化学学报(英文)

基　　金：funded by the Basic Research Program of Qinghai Province(2023-ZJ-910M)。

摘　　要：This study investigates the distribution,geochemical behavior,and potential anthropogenic influences of rare earth elements(REEs)in the surface sediments of Qinghai Lake,the largest saline lake in China.A total of 36 surface sediment samples were analyzed for REE concentrations with a combination of self-organizing maps(SOM)and positive matrix factorization(PMF).Results indicate distinct enrichment patterns,with light REEs(LREEs)exhibiting higher concentrations than heavy REEs(HREEs),reflecting natural abundances and geochemical behaviors.The minimum value was found in Lu as low as 0.091 mg/kg,and the maximum concentration was exhibited in Ce at 78.877 mg/kg.Geoaccumulation index(I_(geo))analysis reveals minor to moderate enrichment of specific REEs of Sm and Nd,suggesting possible localized anthropogenic inputs,particularly near river mouths.Spatial analysis using inverse distance weighting(IDW)and self-organizing maps(SOM)highlights significant correlations between REE distributions and riverine inputs,underscoring fluvial transport's role in sedimentary REE dynamics.PMF identifies mixed natural and anthropogenic sources,with agricultural and industrial activities contributing to elevated REE levels in sediment.These findings provide critical insights into the geochemical behavior of REEs in saline lake systems and off er a foundation for pollution control and sustainable resource management in sensitive environments like Qinghai Lake.

关 键 词：Rare earth elements Qinghai Lake SEDIMENTS Anthropogenic impact SOURCES 

分 类 号：P59[天文地球—地球化学]