Two different illites in Luochuan loess,Northern Shaanxi Province |
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Authors: | Li?Chen Email author" target="_blank">Lifei?ZhangEmail author Hejin?Wang Liping?Zhou Jing?Chen Baoyin?Yuan |
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Institution: | (1) Key Laboratory of Orogenic Belt and Crustal Evolution, MOE; School of Earth and Space Sciences, Peking University, 100871 Beijing, China;(2) Electron Microscopy Laboratory, School of Physics, Peking University, 100871 Beijing, China;(3) College of Environmental Sciences, Peking University, 100871 Beijing, China;(4) Institute of Geology and Geophysics, Chinese Academy of Sciences, 100029 Beijing, China |
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Abstract: | Two different illites in samples from S0 to L10 loess-paleosol sequence at Heimugou section in Luochuan are identified by decomposition of X-ray diffraction (XRD) curve,
transmission electronic microscopy (TEM) and energy dispersive X-ray detector (EDX) analyses. Type I illite displays relatively
poor crystallinity, wide and blunt XRD peaks, the highest content of which in < 2 μm clay minerals is up to 55%. Type II illite
shows good crystallinity, narrow and sharp XRD peaks. The contents of these two types of illites show mutually exclusive relationship
in the studied section. The EDX analyses indicate that in contrast to the illite with good crystallinity, the illite with
poor crystallinity is enriched in K+, Si4+ and depleted in Al3+. |
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Keywords: | loess illite decomposition of XRD TEM |
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