A new selected area electron diffraction (SAED) pattern was found from Fe-illite. The lattice of the ED pattern can be described as a compound tessellation of {3,6}[79{3,6}], which is based on a large coincidence-site...A new selected area electron diffraction (SAED) pattern was found from Fe-illite. The lattice of the ED pattern can be described as a compound tessellation of {3,6}[79{3,6}], which is based on a large coincidence-site lattice (CSL) with oriented crystal associations rotated by a non-crystallographic angle 26°. This phenomenon corresponds to the plesiotwinning of Fe-illite and has been never reported in the nature so far.展开更多
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 en...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+.展开更多
文摘A new selected area electron diffraction (SAED) pattern was found from Fe-illite. The lattice of the ED pattern can be described as a compound tessellation of {3,6}[79{3,6}], which is based on a large coincidence-site lattice (CSL) with oriented crystal associations rotated by a non-crystallographic angle 26°. This phenomenon corresponds to the plesiotwinning of Fe-illite and has been never reported in the nature so far.
基金the Youth Fund of Peking Universitythe Teaching and Research Award Program for Outstanding Young Teachers in the Higher Education Institutions of the Ministry of Education,China+1 种基金the National Natural Science Foundation of China(Grant No.49925307) TEM Analysis Fund of Peking University.
文摘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+.
