Pedosphere 14(4): 433--440, 2004
ISSN 1002-0160/CN 32-1315/P
©2004 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Red ratings for loess-paleosol sequences on China’s Loess Plateau and their paleo-climatic implications |
HU Xue-Feng1 , LU Hua-Yu2, XU Qi1, DONG Li-Jing1, HU Xing1 |
1 Department of Environmental Science and Engineering, Shanghai University, Shanghai 200072 (China). E-mail: xfhu@mail.shu.edu.cn
2 State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075 (China) |
| ABSTRACT |
| 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). |
| Key Words: hematite, loess-paleosol sequences, Loess Plateau, magnetic susceptibility, red ratings |
| Citation: Hu, X. F., Lu, H. Y., Xu, Q., Dong, L. J. and Hu, X. 2004. Red ratings for loess-paleosol sequences on China’s Loess Plateau and their paleo-climatic implications. Pedosphere. 14(4): 433-440. |
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