A chemical index of weather-ing without effect of wind sorting: Fe/Mg ratios in the acid-insoluble phases of loess deposits

查看全文 作　　者：Liu, [1]LW;Chen, [1]J;Wang, [1]HT;Chen, [1]Y

机构地区：[1]Nanjing Univ, Inst Surfacial Geochem, State Key Lab Mineral Deposit Res, Nanjing 210093, Peoples R China

出　　处：《Chinese Science Bulletin》索引2001年第46卷第16期,共4页

基　　金：This work was supported the National Key Basic Research Project (Grant No. G1999043400) ; the National Natural Science Foundation of China (Grant No. 49725307). 摘　　要：Chemical analysis of acid-insoluble fractions in loess and paleosols shows that concentrations of Fe and Mg were under control of wind sorting and post-depositional weathering-pedogenesis. The former caused Fe and Mg concentrated in the finer grain-size fractions, displaying synchronous variations, while the latter made Fe and Mg separated, leading to Fe retained in the weathered section and Mg leached out. Therefore, Fe/Mg ratios in the acid insoluble fraction of loess and paleosols can eliminate the effect of wind sorting and serve as an excellent proxy record on intensity of weathering-pedogenesis. Based on calculation, leaching percentage of Mg in the paleosol S1 from the Luochuan, Xifeng and Huanxian sections is 15%, 11% and 2%, respectively, and on average 9% for the paleosols S2—S14 from the Luochuan section, with the highest value amounting to 22% in S5-1, suggesting the strongest weathering-pedogenesis. 关键词：LOESS PALEOSOL Fe/Mg ratios acid INSOLUBLE PHASES chemical weathering.

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A chemical index of weather-ing without effect of wind sorting: Fe/Mg ratios in the acid-insoluble phases of loess deposits

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