Fe-oxide mineralogy of the Jiujiang red earth sediments and implications for Quaternary climate change, southern China
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Date
2018
Authors
Yin, K.
Hong, H.
Algeo, T.
Churchman, G.
Li, Z.
Zhu, Z.
Fang, Q.
Zhao, L.
Wang, C.
Ji, K.
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Journal article
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Scientific Reports, 2018; 8(1):3610-1-3610-11
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Ke Yin, Hanlie Hong, Thomas J. Algeo, Gordon Jock Churchman, Zhaohui Li, Zongmin Zhu, Qian Fang, Lulu Zhao, Chaowen Wang, Kaipeng Ji, Weidong Lei, Zhenggang Duan
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Abstract
Diffuse reflectance spectrophotometry (DRS) is a new, fast, and reliable method to characterize Fe-oxides in soils. The Fe-oxide mineralogy of the Jiujiang red earth sediments was investigated using DRS to investigate the climate evolution of southern China since the mid-Pleistocene. The DRS results show that hematite/(hematite + goethite) ratios [Hm/(Hm + Gt)] exhibit an upward decreasing trend within the Jiujiang section, suggesting a gradual climate change from warm and humid in the middle Pleistocene to cooler and drier in the late Pleistocene. Upsection trends toward higher (orthoclase + plagioclase)/quartz ratios [(Or + Pl)/Q] and magnetic susceptibility values (χlf) support this inference, which accords with global climate trends at that time. However, higher-frequency climatic subcycles observed in loess sections of northern China are not evident in the Jiujiang records, indicating a relatively lower climate sensitivity of the red earth sediments in southern China.
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© The Author(s) 2018. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.