华北晚古生代聚煤盆地层序地层与聚煤作用关系的探讨

Research on Relationship Between Sequence Strata and Coal－accumulation of Late Palaeozoic Coal－accumulating Basin in Northern China

华北聚煤盆地含煤岩系层序地层可划分为2个超层序、6个层序和28个准层序，聚煤作用同不同级别的层序地层单元密切相关，厚度大、分布广的煤层一般与三级海平面变化周期有关，形成于低位体系域和海侵体系域的转化期；厚度及分布范围相对较小的煤层，与四级海平面变化有关，形成于准层序的界面上；次要煤层与幕式准层序有关。薄煤层、煤线是沉积体系中的相。可容纳空间增长率和泥炭堆积速率的相互关系是泥炭沼泽是否持续发育的关键因素，而两者速率变化则是海平面变化、构造沉降、物源供给、古气候和古植物系统作用的结果。

Coal－bearing sequence strata of Northern China accumulating basin may be divided into 2 supersequences, 6 sequences and 28 parasequences. The coal－accumulation close relating to different grade of sequence stratigraphic units. The coal－beds of thick and wide distribution generally relating to third grade changeable cycle of sea level, formed in the transform period of lower system territory and transgressive system territory, the coal－beds of thin and small distribution, relating to forth grade change of sea level, formed in the border of parasequence. The relationship each other between growth rate of accommodate space and speed of peat accumulation is a key factor whether or not peat bog continued development, and the change of both speeds are the action result of sea level change、structural subsidence、source of material、paleoclimate and paleobotanic system.