河北蔚县煤田下花园组成煤植物初探

An Introduction to Coal-forming Plants in Xiahuayuan Formation,Yuxian Coalfield,Hebei Province

通过对蔚县煤田下花园组煤中植物残体——分散角质层、半丝炭化木材等研究,结合非煤层中植物化石和孢粉组合特征分析,认为泥炭沼泽植物群落主要由松柏类、银杏类、苏铁类和蕨类组成,它们都是本区成煤的重要物质来源。这种森林体系代表了一种温暖潮湿、雨量充沛的古气候条件。煤中丝炭及半丝炭化组分含量丰富是泥炭堆积速度快于盆地基底沉降速度,并最终导致泥炭沼泽覆水浅,泥炭层多处于相对干燥、氧化环境的表现。不同煤层中丝炭及半丝炭化组分含量的差异,为煤层对比提供了新的依据。

Through studies on plant residues-dispersed cuticles, semifusinized wood in coals in Xiahuayuan Formation, Yuxian coalfield, combined with characteristic analyses of plant fossils and palynological assemblages not in coal seams, considered that the peat bog plant community is mainly built up of Coniferales, Ginkgoales, Cycadales and Pteridophyta, they are all major coal-forming materials in the area. This kind of forest system was representative of warm, humid with plentiful precipitation paleoclimate condition. Abundant fusain and semifusinized maceral in coal were representation of the peat accumulation velocity even faster than basin subsiding velocity, resulted in shallow water covering peat bog and peat mainly stood in relatively dry and oxidizing environment. Different fusain and semifusinized maeeral contents in different coal seams provide new basis for coal seam correlation.