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借助于X光衍射仪、透射电子显微镜 (TEM )和扫描电子显微镜 (SEM)等手段 ,较详细地揭示了内蒙大青山晚古生代 (C2 —P1)煤系中降落火山灰的蚀变特征 ,以此来论述沉积环境对火山灰蚀变作用的影响。泥炭沼泽环境中 ,降落火山灰以原地直接高岭石化为主 ,残留较多的火山玻屑和晶屑形态 ,并具斑状结构 ;非泥炭沼泽环境中 ,降落火山灰以异地凝胶化—多种粘土矿物化为主 ,微层理、微层面等沉积岩特征明显。火山灰降落的环境不同 ,其蚀变作用和蚀变产物亦不同。本文对加深煤系火山事件沉积的认识和研究煤系高岭岩的成因机理颇有意义。
By means of X-ray diffractometer, transmission electron microscopy (TEM) and scanning electron microscopy (SEM), the alteration characteristics of volcanic ash descending in the Late Paleozoic (C2-P1) coal measure of Daqingshan, Inner Mongolia were revealed in detail. To discuss the impact of sedimentary environment on alteration of volcanic ash. Peat swamp environment, the landing of volcanic ash to the main direct kaolinite, the residual more viticum and crystal debris morphology, and with a patchy structure; non-peat swamp environment, the landing of geothermic gelation - a variety of Clay mineralization dominated, micro-layering, micro-level sedimentary rocks and other obvious characteristics. Volcanic ash landed in different environments, the alteration and alteration products are also different. This article is of great significance to deepen understanding of the sedimentary volcano events of coal measures and to study the genesis mechanism of kaolinite from coal measures.