【摘要】 贵州上二叠统含煤岩系煤级分布在平面上呈现X型分布特征,即具有东、西侧变质低,中部变质高的特点,分布规律明显。结合该地区的岩浆活动、区域热演化特征,对含煤岩系煤级分布的成因进行了分析,晚二叠世早期峨眉山玄武岩活动所导致的区域性高的古地热场是该地区煤级分布的主要原因,而燕山期的小型岩体则是造成局部煤变质程度异常的主要原因。更多还原

【Abstract】 The coal classification distribution of coal bearing strata in the Up Permian Series of Guizhou has an X type feature in plan.The metamorphism in the east and west part of the series is lower and the metamorphism in the middle is higher.The distribution law is very clear.In combined with the magma activities of the area and the thermal evolution features in the area,the paper analyzed the cause of the coal classification distribution in the coal bearing strata series.The results showed that the ancient geothermal field in the high area caused by Early Emei Mountain basalt activities in Upper Permian Epoch could be the main causes of the coal classification distribution in the area.The small rock mass of the Yanshan Period could be the main cause of the difference to the metamorphic grade of local coal.更多还原