Research progress in formation mechanisms of super-thick coal seam

In order to study the super-thick coal seam (thickness greater than 40 m) formation mechanism,many coal geologists have carried out some thorough researches,and have gained some fruitful results. Based on the traditional coal geology theory,if the peat mire water rising rate and plant body accumulation rate were in a state of equilibrium compensation for a long-term,it can form a thick coal seam,even the thickness can reach hundreds of meters. The peat thickness,according to certain compression ratio,can amount to thousands of meters,and the modern single peat thick- ness was no more than 20 m. This causes a huge contradiction between ancient and modern peat accumulation. The al- lochthonous accumulation genetic model, from the perspective of peat ( coal) rehandling, explains the formation of some super thick coal seam,which are mostly developed in the fault basin. And the more stacked coal seam genetic model,from the angle of peat layer overlay,explains the formation of some super thick coal seam,which are mostly developed in the depression basin. These models can help to reconcile the Law of Uniformitarianism with modern and ancient peat mire development. The formation of a super thick coal seam,also may be the result of the joint action of one or more genetic mechanism. However,many ways have yet to be studied in-depth,for example,whether there are other genetic models,the control factors and the mechanism of genetic models,and the abundant geological information contained in super thick coal seams.