滕县煤田红层的赋存特征与护煤作用

OCCURRENCE FEATURES AND PROTECTING COAL OF THE RED-BED IN TENGXIAN COAL-FIELD

通过红层与古构造及剥蚀关系的分析认为:对石炭二叠纪煤系赋存有影响的褶皱发生在石炭二叠纪煤系沉积以后、老红层沉积之前。煤田内断层的生成顺序,北东东—近东西向断层组生成最早,它控制着老红层的分布;北东向逆断层组与褶皱同期生成,最后产生北北东—近南北向断层组。老红层保护了煤系,是区域找煤的标志;新红层覆盖下的负向构造也有煤系赋存,但埋藏较深。

The analyses of relationship between denudation and paleotectionics show that folds have an influence on the Carboniferous and Permian coal-bearing formation had been occurrend after the deposition of these coal-bearing formation and before the deposition of old-bed. The order of fault-forming as following: First of all, fault group in nearly EW and NEE direction and controlled distribution of red-bed; and then, thrust fault group in NE direction and fold; fault group in NNE to nearly NS at the latest. Old red-bed protecting coal is also a marker of regional finding coal. Carboniferous and Permian coal-bearing formation were buried deep in negative tectoinics under new red-bed.