波环孢属(Sinulatisporites)在华北地区的时空分布及其地层学意义

TEMPORAL-SPATIAL DISTRIBUTION OF SINULATISPORITES IN NORTH CHINA AND ITS STRATIGRAPHIC SIGNIFICANCE

对鲁西晚古生代含煤岩系以及华北各地石炭、二叠系孢粉组合中已经发现的Sinulatisporites一属的时空分布进行详细研究,结果表明:其时空分布仅限于华夏植物区的北方亚区,在时间上始于早二叠世早期(太原组),灭绝于中二叠世中、晚期,可视为鲁西乃至华北地区早二叠世晚期、中二叠世早期中期华夏植物区北方亚区的典型分子。其母体植物可能为一种喜湿热的真蕨植物或种子蕨植物。该属产出层位稳定,延续时间较短,在月门沟统山西组、石盒子统下石盒子组含量丰富,又常产出于月门沟统山西组的主要含煤岩段及其上部石盒子统下石盒子组的砂、泥岩段,故可作为二叠系划分和对比煤层的重要依据。

In recent years, the authors have been studying on the temporal-spatial distribution of Sinulatisporites which existed in the Carboniferous-Permian Sporopollen Assemblages in Western Shandong and North China region. Results show that the distribution of Sinulatisporites was only limited in the northern sub-region of the Cathaysian flora, and began to occur at the early Early Permian (Shanxi Formation), died out at the middle and late Middle Permian. Sinulatisporites can be re- garded as a typical element of the northern sub-region of Middle Cathaysian flora in Western Shandong and North China in the period from late Early Permian to early Middle Permian.The maternal plant of Sinulatisporites may be a kind of hydrophilous Filicinae or Pteridosperm. It is stable in occurring horizon, and often rich in the coal-bearing member of late Early Permian and the sandstone- mudstone member of early Middle Permian. It may provide important basis for the correlation of coal seams and classification of Permian strata.