北京周口店地区晚古生代煤系煤层变质变形机制研究

The Metamorphism and Deformation Mechanism of Late Palaeozoic Coal Measures and Coal Seams in Zhoucoudian, Beijing

北京周口店地区晚古生代煤系煤层遭受过强烈的变质与变形。与华北同时期煤田相比，它独具特色：煤级达高级无烟煤，乃至接近于超无烟煤，煤层的糜棱化构造煤极其发育。作者采用薄片、扫描电镜及Ｘ衍射诸手段对煤系及煤层的变质变形特征进行了系统的研究，确定了煤变质作用发生的时间，变质作用类型和变质作用温压条件；同时探讨了煤层变形，即糜棱化作用发生时期及形成条件。

The late palaeozoic coal measures and coal seems in zhoucoudian, Beijing,have undergone strong metamorphism and deformation. Coal rank is upper-anthracite or ultra-an-thracite and the structural coal is very common.The metamorphism characteristics and deformation characteristics of coal measure and coal beds have been studied systematically from thin section, SEM and X-ray diffraction analysis. The stage and temperature-pressure condi-tion of deformation of coal are also discussed in this paper.