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Magnetic characteristics of lake sediments in qiangyong co lake,southern Tibetan Plateau and their application to the evaluation of mercury deposition

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Journal of Geographical Sciences 2020年第9期30卷 1481-1494页

作者： GAO Xing KANG Shichang LIU Qingsong CHEN Pengfei DUAN Zongqi State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesCASLanzhou 730000China Departme nt of Ocea n Scie nee and Engin eeri ng Souther n Un iversity of Science and Tech no logyShe nzhen 518055GuangdongChina The Geographical Society of China Beijing 100101China

Heavy metals,one of the most toxic classes of pollutants,are resistant to degradation and harmful to the biological *** lakes that have developed on the Tibetan Plateau are ideal regions to investigate historic heavy metal pollution,particularly through the use of the reliable 210 Pb dating *** magnetism has been successfully applied to estimate heavy metal pollution in different environmental systems due to its characteristics of simple processing steps,good sensitivity,and ***,it has not yet been applied to assess heavy metal pollution in lake sediments on the Tibetan Plateau.A series of environmental magnetic investigations of qiangyong co lake sediments(southern Tibetan Plateau) was therefore conducted to explore the relationship between magnetic minerals and mercury(Hg) *** results showed that the magnetic mineral species in lake sediments remained stable,with similar levels of four different components from 1899 to ***,the proportion of component 1(C1,hematite) increased continuously with the corresponding decrease in the proportion of C2(goethite),while the proportions of C3 and C4(magnetite) did not change *** a result,the bulk magnetic signals(e.g.,SIRM and clf) were unsuitable for the evaluation of the Hg concentration;however,the proportion of hematite had a strong positive correlation with the Hg *** is possible that the qiangyong Glacier(the main water supply for qiangyong co lake) has experienced faster melting with global and local warming,and the Hg trapped in cryoconite and ice was ***,with a large specific surface area,has a strong capacity for absorbing Hg,and both materials are ultimately transported to qiangyong co *** proportion of hematite in a sample is therefore a suitable semi-quantitative proxy that can be used to evaluate the Hg concentration in qiangyong co lake *** study confirmed that the variation of

关键词： southern Tibetan Plateau qiangyong co lake environmental magnetism mercury(Hg)deposition

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