Synsedimentary structures of Early-Middle Jurassic coal-accumulating period and their control on coal in Xinjiang
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摘要: 新疆早-中侏罗世同沉积（期）构造活动自始至终与聚煤作用相伴，并直接影响含煤地层发育程度和煤层的原生厚度及结构。该期同沉积构造活动受特提斯-喜马拉雅地球动力学体系控制，其主要活动方式表现为同沉积逆冲断层和同沉积正断层，从而造成聚煤盆地基底沉降速度与幅度的明显差异。在其控制下，聚煤盆地的沉积中心和赋煤中心有自西向东、由南向北迁移的趋势；从含煤区尺度进行比较，聚煤强度与盆地基底总体沉降幅度呈负相关关系；从含煤盆地或煤田尺度进行比较，聚煤强度与盆地基底沉降速度之间的关系分别表现为正相关型、抛物线型及负相关型。Abstract: The contemporaneous tectonic activity accompanying the coal accumulation from the beginning to the end has direct effect on the development degree of coal-bearing strata, and the original thickness and structure of coal seams in the Early-Middle Jurassic in Xinjiang. The synsedimentary tectonic activity, controlled by the Tethys-Himalayan geodynamic system, mainly shows synsedimentary reverse thrust and normal faults in the period. As a result, the subsidence velocity and range of the basement of coal-accumulating basins differ obviously in the Early-Middle Jurassic period in Xinjiang. Under the control of the Tethys-Himalayan geodynamic system, the depocenter and coal-bearing center of the coal-accumulating basin in the Early-Middle Jurassic period in Xinjiang show a tendency of migration from the west to the east and from the south to the north. Comparing coal-bearing region scale, the coal-accumulating strength and the overall subsidence range of the basement of basin present a negative correlation; Comparing coal basin or coal field scale, the relationship between the coal-accumulating strength and the subsidence velocity of the basin basement present positive correlation, parabola and negative correlation respectively.
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