太行山东麓煤田含煤地层中铵伊利石矿物特征  

Mineralogy of Ammonium Illite in Coal Measures of Eastern Taihang Piedmont Coalfields

作　　者：郝国强[1] 胡社荣[1] 刘钦甫[1] 张运勋[1] 王玖玲[1] 

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083

出　　处：《科技导报》2013年第22期15-19,共5页Science & Technology Review

基　　金：国家自然科学基金项目(41072119)

摘　　要：通过X射线衍射分析(XRD)、傅里叶红外光谱分析(IR)和X射线光电子能谱分析(XPS)等测试手段,发现太行山东麓煤田部分煤层及其夹矸中含有铵伊利石,并对样品中的铵伊利石进行了详细的矿物学研究。分析结果表明:X射线衍射谱图上,铵伊利石的基面衍射峰间距d(001)值高于普通伊利石的d(001)值(1.006nm),(002)衍射峰强度与(003)衍射峰强度相当,而普通伊利石的(002)衍射峰强度为24.4%,约为(003)衍射峰强度的1/3;对铵伊利石晶格常数进行了计算,太行山东麓煤田含煤地层中的铵伊利石空间群属于C2/m,晶胞参数a介于0.52133～0.52774nm,b介于0.89814～0.91693nm,c介于1.02538～1.05285nm,β介于101.127°～101.699°,z为2,体积介于0.47611～0.49224nm3,密度介于2545～2697e-/nm3;研究区铵伊利石类型为1M多型;红外光谱曲线中,铵伊利石中的NH+4变形振动峰范围为1427.58～1431.95cm-1;铵伊利石的NH+4的N1sXPS结合能为402.4eV。Ammonium illite that belongs to 2：1 layered silicate minerals is a kind of di-octahedral mica-like clay minerals, and it is the isomorphism of illite, in which the K＋ was substituted by the NH＋4 . By means of XRD, IR and XPS, ammonium illite was discovered in some coals and coal partings of Eastern Taihang Piedmont Coalfields, and mineralogical researches were studied in detail. The result of XRD spectrogram shows that ammonium illite＇s X-ray diffraction peak of d（001） is higher than that of ordinary illite, whereas its （002） and （003） diffraction peak intensity is similar. but the ordinary illite＇s（002）diffraction peak intensity is 24.4%, which is about 1/3 of the （003） diffraction peak intensity. Lattice parameters about ammonium illite in the investigative area are calculated, and the results show that its space group is C2/m, with every parameters including a （0.52133nm to 0.52774nm）, b （0.89814nm to 0.91693nm）, c （1.02538nm to 1.05285nm）, β （101.127° to 101.699° ）, z （2, volume is 0.47611nm 3 to 0.49224nm 3 ）, density （2545 e -/nm 3 to 2697e -/nm 3 ）. The above descriptions indicate that the ammonium illite is 1M polytype. The results of IR spectrogram demonstrated that the deformation vibration peak of NH＋4 range from 1427.58cm-1 to 1431.95cm-1 , and the N1s XPS banding energy of NH＋4 is 402.4eV. In nature the ammonium illite-illite solid solution is more general than pure ammonium illite. Thus, mostly ammonium illite contains a certain amount of K. Therefore, the K 2p peak is often observed by the XPS spectra.

关 键 词：太行山东麓煤田 含煤地层 铵伊利石 矿物特征 

分 类 号：P618.11[天文地球—矿床学]