The Translation Mechanism of Smectite to Illite: An Infrared Spectroscopic Study of Ordered Mixed-Layer Illite/Smecite |
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| Authors: | Bohui Xu Shuli Ding Hongfei Cheng |
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| Institution: | 1. Key Laboratory of Resource Survey and Research of Hebei Province, Hebei University of Engineering , Handan , Hebei , P.R. China;2. School of Geoscience and Surveying Engineering, China University of Mining &3. Technology , Beijing , China |
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| Abstract: | The infrared spectral characteristics of ordered mixed-layer illite/smectite interstratified clay mineral with different mixed-layer ratios (S% = 5%, 10%, 15%, 20%, 25%, and 30%, where S% is mixed-layer ratio) from the Shihezi Formation of Late Permian in the Hanxing mining area, Hebei province of China, were studied by infrared spectroscopy. The results show that three infrared regions (3625 cm?1±, 1200–1000 cm?1, 850–700 cm?1) changed with S%'s variation. The characteristic absorption bands of smectite at 3640 cm?1, 1030 cm?1, and 825 cm?1 disappeared gradually with the decrease of S%, and the intensity of characteristic absorption bands of illite at 3625 cm?1, 1100 cm?1, 1024 cm?1, 796 cm?1, and 777 cm?1 increased. These changes indicated that the illitization of smectite was realized by partial substitution of aluminum iron (Al3+) for silicon iron (Si4+) in silico-oxygen (Si–O) tetrahedron. |
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| Keywords: | illite/smectite interstratified clay mineral infrared spectroscopy mixed-layer ratio ordered |
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