The tectonic controlling action on coal-bearing sedimentary cycle of Tiefa basin

In order to study the coal-bearing sedimentary cycle's origin of Tiefa basin, the authors have made further researches on the tectonic controlling action on coal-bearing sedimentary cycle.The above-mentioned researches are based on the reveal of the coal-bearing sedimentary cycle's characteristics by using the sedimentary facies analysis, and aslo on the theory that the activity of basin edge fault can cause the accommodation spatial change which can control the sediment volume partition, the types and spatial allocation of sedimentary facies.According to the above researches, the author gets the following understanding.The first understanding is that under the condition of the accommodation spatial decreasing and the higher depositional filling rate which is caused by the activity of basin edge fault, the interior of basin edge fault alluvial facies and the anterior fan fluvial facies are formed, meanwhile, the latter composes the main body of coal-bearing sedimentary cycle.The another understanding is that under the condition of the matching basin edge zone's accommodation space and sediment volume which is caused by the activity of basin edge fault, after the interior of basin edge fault alluvial fan is formed, few coarse clastic rocks can be moved further, and the large peat swamp gasification area at the anterior part of alluvial fan forms the upper coal seam of coal-bearing sedimentary cycle.The alternation of two kinds of above-mentioned situations forms the coal-bearing sedimentary cycle of Tiefa basin.