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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 dis- persive 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 inAl3+.
Two different illites in samples from S0 to L10 loess-paleosol sequence at Hemugou section in Luochuan are identified by decomposition of X-ray diffraction (XRD) curve, transmission electronic microscopy (TEM) and energy dis- persive X-ray detector (EDX) Analyzes. Type I illite displays relatively poor crystallinity, wide and blunder 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. Two types of illites show mutually exclusive relationship in the studied section. The EDX analyzes that that contrast to the illite with good crystallinity, the illite with poor crystallinity is enriched in K +, Si4 + and depleted inAl3 +.