Abstract Ammonium-illite is the isomorphism of the illite，in which the K+was substituted by the NH+4. The X-ray diffraction，fourier infrared spectrum and TGA-DSC combined with fourier infrared spectrum were used to study the minerals in No.15 coal seam from Jincheng and Yangquan districts of Shanxi Province.It was found that the main clay minerals in the coal partings and the coal ashes under low temperature were ammonium-illite and kaolinite，with 21％～74％ ammnioum-illite. The X-ray diffraction peak of d(001)=1.026～1.032 nm and the absorption peak of 1428.37～1431.99 cm-1 in infrared spectrum，are two important characteristics to distinguish the ammonium-illite from other clay minerals.The results of TGA-DSC combined with fourier infrared spectrum indicated that the deammonification temperature was between 450 ℃ and 700 ℃，and the crystal destruction and ammonium-releasing reach maximum at the temperature of 559 ℃.It was found that the ammonium had kaolinite illusion，indicating that the ammonium-illite was transformed from kaolinite under the NH+4-rich and K+-poor environment in diagenesis.
About author: Zheng Qiming，born in 1983，is a Ph.D. candidate of China University of Mining and Technology(Beijing)，and is mainly engaged in researches of minerals of coal seams.Tel：15210572325，E-mail:zqm6502644@163.com. About the corresponding author Liu Qinfu，born in 1964，is a professor of China University of Mining and Technology(Beijing)，and is mainly engaged in mineralogy and petrology.E-mail: lqf@cumtb.edu.cn.
Cite this article:
. Mineralogy and origin of ammonium-illite of the Carboniferous Taiyuan Formation in Jincheng and Yangquan districts of Shanxi Province[J]. JOURNAL OF PALAEOGEOGRAPHY, 2011, 13(5): 501-508.
. Mineralogy and origin of ammonium-illite of the Carboniferous Taiyuan Formation in Jincheng and Yangquan districts of Shanxi Province[J]. JOPC, 2011, 13(5): 501-508.
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