Kaolinite-smectite mixed-layer clays in the Jiujiang red soils and their climate significance
Date
2012
Authors
Hong, H.
Churchman, G.
Gu, Y.
Yin, K.
Wang, C.
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Journal article
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Geoderma, 2012; 173:75-83
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Hanlie Hong, G. Jock Churchman, Yansheng Gu, Ke Yin, Chaowen Wang
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Abstract
Clay mineralogy of the Jiujiang soils, classified as red earth (on summit and slope), were investigated using X-ray diffraction (XRD), cation exchange capacity (CEC) determination, and high-resolution transmission electron microscopy (HRTEM). The XRD results show that the soils included kaolinite, illite, vermiculite, and mixed-layer I/S and K/S as clay minerals. In XRD patterns of clay separates the low-angle shoulder on the kaolinite (001) peak shifted to ~8 Å on glycolation, indicating the presence of mixed-layer K/S clays in the soils. The occurrence of K/S clays confirmed that the Jiujiang red earth was derived from syndepositional pedogenesis and the climates changed from warm and seasonally dry to warm and more humid conditions during the soil-forming period.
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Copyright © 2011 Elsevier B.V. All rights reserved.