Red Ratings for Loess-Paleosol Sequences on China’s Loess Plateau and Their Paleo-Climatic Implications

查看全文 作　　者：HUXue-[1]Feng;LUHua-[2]Yu;[1]XUQi;DONGLi-[1]Jing;[1]HUXing

机构地区：[1]DepartmentofEnvironmentalScienceandEngineering,ShanghaiUniversity,Shanghai200072(China);[2]StateKeyLaboratoryofLoessandQuaternaryGeology,InstituteofEarthEnvironment,ChineseAcademyofSciences,Xi'an710075(China)

出　　处：《Pedosphere》索引2004年第14卷第4期,共8页

基　　金：Project supported by the National Natural Science Foundation of China (No. 40101013) ; the Outstanding Overseas Chinese Scholars Fund of the Chinese Academy of Sciences (No. 2003-1-7). 摘　　要：Comparisons of red ratings (RR) with Fed, Fed/Fet, clay content, and magnetic susceptibility (X) of two loess-paleosol sequences at Luochuan and Lingtai on China's Loess Plateau were conducted to study the possible relationship between RR and pedogenic degrees of the two loess-paleosol sequences, and to discuss whether the RR could become new paleo-climatic indicators. Results showed that the RR of the two loess-paleosol sequences had positive, highly significant (P < 0.01)correlations with: 1) citrate-bicarbonate-dithionite (CBD) extracted iron (Fed), 2) ratios of CBD extracted iron to total iron (Fed/Fet), 3) clay (< 2 μm), and 4) magnetic susceptibility (X). This suggested that the RR of these loess-paleosol sequences could indicate degrees of loess weathering and pedogenesis and were potential paleo-climatic proxies. The strong correlations of RR to Fed and X also implied that during pedogenic processes, pedogenic hematite in loess and paleosols were closely related to the amount of total secondary iron oxides and pedogenic ferrimagnetic minerals (predominantly maghemite). 关键词：赤铁矿黄土高原古土壤序列磁化系数中国西北地区

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Red Ratings for Loess-Paleosol Sequences on China’s Loess Plateau and Their Paleo-Climatic Implications

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