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

HU Xue-Feng, LU Hua-Yu, XU Qi, DONG Li-Jing and HU Xing Department of Environmental Science and Engineering, Shanghai University, Shanghai 200072 (China). 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）.

Keywords：

hematite; loess-paleosol sequences; Loess Plateau; magnetic susceptibility; red ratings;

Series：
(D) Agriculture
Subject：
Fundamental Science of Agriculture; Agronomy
Classification Code：
S151

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

HU Xue-Feng, LU Hua-Yu, XU Qi, DONG Li-Jing and HU Xing Department of Environmental Science and Engineering, Shanghai University, Shanghai 200072 (China). State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075 (China)

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