Structural controlling coal and coal occurrence regularity in Heishan coalfield,Inner Mongolia

Based on the analysis of the regional tectonic background and data of exploration,structural control action of tectonic movement on coal seam hosting were discussed.Three coal-controlld structural styles reviewed in the paper have recvealed occurrence regularity of coal measure.The coal-bearing property was controlled by syndeposi-tional structures.The NWW folds appeared exert the most important controlling effects on coal seaman hosting,which was formed at Indo-Chinese epoch.The tensional fracture and strike-slip fault disturbed the continuity of coal measure strata,which was formed at the late stage of Himalayan period.In addition the depth of coal seam was controlled by them in eastern and western coalfield.In the thrust fault-fold and fault-monocline zone,the coal seam in the hanging wall of reverse fault is uplifted to the shallow and easy to exploration,but the scale of mines is small.In the fold-fault zone,subordinate anticline of synclinorium is the main favourable exploration areas for coal resource,because the overlying strata of are denude and buried depth of coal beam becomes shallower.