Geochemical characteristics and environmental implications of loess sequences in the Loess Plateau  

作　　者：ZHANG Jialin ZHAO Zhongqiang XIA Dinghong LI Zhenyang ZENG Liyuan HE Hongming SONG Yinxian CHEN Zhong 张佳琳;ZHAO Zhongqiang;XIA Dinghong;LI Zhenyang;ZENG Liyuan;HE Hongming;SONG Yinxian;CHEN Zhong(School of Land and Resources Engineering,Kunming University of Science and Technology,Kunming 650093,P.R.China;Key Laboratory of Geological Disaster Prediction and Early Warning and Ecological Protection and Restoration of Plateau Mountain,Ministry of Natural Resources,Kunming 650093,P.R.China;Yunnan Key Laboratory of Geological Disaster Prediction and Warning and Ecological Protection and Restoration of Plateau and Mountain,Kunming 650093,P.R.China;School of Geographical Sciences,East China Normal University,Shanghai 200241,P.R.China;Institute of Soil and Water Conservation,Ministry of Water Resources,Chinese Academy of Sciences,Yangling 712100,P.R.China)

机构地区：[1]School of Land and Resources Engineering,Kunming University of Science and Technology,Kunming 650093,P.R.China [2]Key Laboratory of Geological Disaster Prediction and Early Warning and Ecological Protection and Restoration of Plateau Mountain,Ministry of Natural Resources,Kunming 650093,P.R.China [3]Yunnan Key Laboratory of Geological Disaster Prediction and Warning and Ecological Protection and Restoration of Plateau and Mountain,Kunming 650093,P.R.China [4]School of Geographical Sciences,East China Normal University,Shanghai 200241,P.R.China [5]Institute of Soil and Water Conservation,Ministry of Water Resources,Chinese Academy of Sciences,Yangling 712100,P.R.China

出　　处：《High Technology Letters》2024年第3期310-321,共12页高技术通讯（英文版）

基　　金：the National Natural Science Foundation of China(No.41561001,42271007).

摘　　要：The major,trace,and rare earth elements of the Duanjiapo(DJP)section in the south of the Loess Plateau,the Jiaxian(JX)section in the north,and the Jiuzhoutai(JZT)section in the west are studied.The results show that the main elemental characteristics of loess in three profiles are consistent with the upper continental crust(UCC).In terms of trace elements,Th,Nb,Zr,Hf,Y,Cs,W,Cr,V,Li,and Pb show relative enrichment compared with UCC;Rb,Ba,Sr and Be exhibit relative depletion.The average ofΣREE is 171.91ppm with a negative anomaly forδEu and essentially no anomaly forδCe.The results of K_(2)O/Na_(2)O,Rb/Sr ratios,as well as the leaching co-efficient from three profiles,indicate DJP>JX>JZT,suggesting that DJP experiences the strongest weathering leaching effect.The chemical index of alteration(CIA)reveals that all three profiles of loess are in the primary stage of Ca and Na depletion.DJP is generally in the early to moderate stage of chemical weathering,while JX and JZT are both in the early stage.

关 键 词：LOESS chemical weathering element geochemistry chemical index of alteration(CIA) 

分 类 号：P59[天文地球—地球化学] X142[天文地球—地质学]