内蒙古准格尔黑岱沟6号煤层中微量元素的相分异作用

The 6# coal of Heidaigou from Junger Coalfield in inner Mongolia:The action of trace elements separation in the coal facies

用数理统计的方法,研究了准格尔6号煤中微量元素和泥炭沼泽沉积环境的关系。研究表明,煤中微量元素在泥炭沼泽沉积中,有着较为明显的"相分异"规律。多数处在元素周期表中第Ⅰ、Ⅱ主族,第四周期副族位置的元素,即相对较"轻"的元素,对镜惰比(V/I)及凝胶化指数(GI)反映比较灵敏或有一定关联性。因而反映潮湿还原的沼泽沉积环境比较有效,其典型代表就是Rb和Cs;而相对较"重"的元素,即第五周期以后的副族元素、第Ⅲ主族以后的主族元素,则多对氧化指数(OI)和破碎指数(BI)响应比较灵敏或有某种间接的关联性,因而反映干燥氧化的沼泽沉积环境比较有效,其典型代表就是Hg和W。与植物组织保存指数(TPI)、植被指数(VI)和地下水流动指数(GWI)、搬运指数(TI)关联的元素则可看作介于两者之间。总之,微量元素从"轻"元素到"重"元素,从低阶周期到高阶周期,从低次主族到高次主族,有对V/I和GI反映灵敏转为对OI和BI更为灵敏的趋势。从而为微量元素(包括部分常量元素)对泥炭沼泽沉积亚微环境的识别和划分,提供了强有力的依据。

The correlation between trace elements and coal-forming environment in the 6# coal from Junger coalfield has been studied with correlation analysis method.＂ The result shows that there is obvious rule of trace elements separation in the coal facies. The most of ＂light elements＂ including IA, IIA and B groups of the forth period in periodic table are sensitive to the index of V/I and GI. The most of ＂heavy elements＂ such as elements after ones of IIIA and B groups of the fifth period in periodic table are sensitive to OI and BI index. Other elements are respectively correlated with TPI, VI, GWI and TI index. In a word, there is a trend in trace elements sensitive from V/I or GI to OI or BI when they are changed from light one to heavy, from low rank period to high and from low order A elements to high one.