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

作　　者：Liu, LW Chen, J Wang, HT Chen, 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》2001年第16期1384-1387,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.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. 

分 类 号：P595[天文地球—地球化学]