STUDY ON THE CLAY MINERALOGY AND GEOCHEMISTRY OF MUDSTIONES IN SHANXI FORMATION,CHAOHUA COAL MINE,ZHENGZHOU,NORTH CHINA
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摘要: 为了恢复郑州超化煤矿山西组沉积时盆地的介质环境条件,利用X射线衍射和等离子光谱分析技术对研究区泥质岩的粘土矿物和微量元素进行了分析,研究表明研究区泥质岩中微量元素和粘土矿物组成在二1煤层的上下明显存在差异:B、Sr/Ba、P、CaO、MgO、V、Li、Ni、Zn含量在底板泥质岩中含量较高,而在顶板以上泥质岩中含量明显降低;TiO2、Cu和Co含量在垂向上的变化趋势与上述元素相反;伊/蒙间层矿物和伊利石在底板泥质岩中含量较高,而顶板以上泥质岩中高岭石具有增高趋势。这反映出二1煤层底板明显受到海水影响,而在煤层形成以后海水影响明显减弱。Abstract: In order to rebuild the sedimentary environmental conditions of Shanxi Formation in Chaohua coal mine,Henan Province,the clay mineralogy and geochemistry have been analyzed with XRD and ICP.the results show that the contents of trace elements and clay minerals are obviously different in the mudstones above and under No.2-1 coal seam of Shanxi Formation.The contents of B、Sr/Ba、P、CaO、MgO、V、Li、Ni、Zn are higher in the floor mudstones,but rapidly decrease in the mudstones above coal seam.TiO2、Cu and Co have the opposite change trends to the elements above stated.The contents of Illite and I/M mixedlayer clay mineral are higher in the floor mudstones,but Kaolinite is higher in the mudstones above coal seam.The results suggest that the influence of marine water is obvious on the formation of floor mudstones,but rapidly weak after the formation of coal seam.
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Keywords:
- clay minerals /
- trace element /
- sedimentary environment
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