山西晋城地区含煤地层中的铵伊利石/蒙脱石间层矿物

运用X射线衍射分析、傅里叶红外光谱分析以及热重－热流－红外光谱同步分析等手段，对山西晋城地区的9号煤层夹矸及底板进行了矿物学研究，发现夹矸和底板中主要黏土矿物为铵伊利石/蒙脱石间层、伊/蒙间层、高岭石和钠云母，含有少量的伊利石。铵伊利石/蒙脱石间层矿物EG片X射线衍射图谱中1.033 nm（铵伊利石的d (001)）左侧的子峰明显高于右侧的子峰，NH+4变形振动引起的红外特征吸收峰（位于1 427.09～1 433.34 cm -1）以及在加热到561 ℃左右会有大量NH 3产生均是区分于其它黏土矿物的重要标志。铵伊利石/蒙脱石间层属于热液蚀变黏土矿物，是在有机质成熟度较高条件下，有机氮以NH+4释放出来并替代K +参与伊蒙间层矿物的伊利石化作用而成，形成温度在350 ℃左右。

Ammonium-illite smectite interlayer clay minerals in coal-bearing strata in Jincheng district of Shanxi Province

X ray diffraction,fourier infrared spectrum and TGA-DSC combined with fourier infrared spectrum were used to study the mineralogical characteristics of the partings and floors of No.9 coal in the areas of Jincheng in Shanxi Province.There are several important characteristics of ammonium-illite smectite interlayer including the sub-peak on the left of 1.033 nm(d(001) of ammonium illite)higher than the right sub-peak,the IR absorption peaks from the distortion vibrtation of NH+4 between 1 427.09 and 1 433.34 cm-1 and NH3 generated heated at the temperature of 561 ℃.Ammonium-illite smectite interlayer is hydrothermal altered clay minerals,generated from the illitization of illite smectite interlayers when K+ is substituted by NH+4 transformed from organic nitrogen in the condition of relatively high mature,and its formation temperature is about 350 ℃.