Kaolinite-smectite mixed-layer clays in the Jiujiang red soils and their climate significance
2012
Hong, H. | Churchman, G. | Gu, Y. | Yin, K. | Wang, C.
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.
显示更多 [+] 显示较少 [-]Hanlie Hong, G. Jock Churchman, Yansheng Gu, Ke Yin, Chaowen Wang
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