| 中国黄土高原黄土-古土壤序列的红度对古气候的指示意义 |
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| 作者姓名： | HU Xue-Feng LU Hua-Yu XU Qi DONG Li-Jing HU Xing |
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| 作者单位： | Department of Environmental Science and Engineering, Shanghai University, Shanghai 200072 (China). E-mail: xfhu@mail.shu.edu.cn;State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075 (China);Department of Environmental Science and Engineering, Shanghai University, Shanghai 200072 (China). E-mail: xfhu@mail.shu.edu.cn;Department of Environmental Science and Engineering, Shanghai University, Shanghai 200072 (China). E-mail: xfhu@mail.shu.edu.cn;Department of Environmental Science and Engineering, Shanghai University, Shanghai 200072 (China). E-mail: xfhu@mail.shu.edu.cn |
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| 基金项目： | *1Project supported by the National Natural Science Foundation of China (No.40101013) and the Outstanding Overseas Chinese Scholars Fund of the Chinese Academy of Sciences (No.2003-1-7). |
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| 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).
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| 关 键 词： | hematite loess-paleosol sequences Loess Plateau magnetic susceptibility red ratings |
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