黔北务川-正安-道真地区下二叠统大竹园组和梁山组孢粉学研究

Palynology of the Lower Permian Dazhuyuan and Liangshan Formations in Wuchuan-Zheng'an-Daozhen area,northern Guizhou Province

文中材料采自黔北务川一正安一道真地区下二叠统大竹园组和梁山组。大竹园组孢粉化石类型单调，保存较差；而梁山组孢粉化石丰富，保存良好。孢粉组合特征为：（1）大竹园组包含丰富的Calamospora和Florinites及少量Torisporaverrucosa，Gulisporites，Alisporites，Hamiapollenites和Striatopodocarpites，这一孢粉组合主要出现在上石炭统至下二叠统。按照大竹园组层位和孢粉化石特征，其地质时代应为早二叠世Asselian期一Ar—tinskian期（相当于紫松期一隆林期）。（2）梁山组中可建立孢粉组合Laevigatosporites vulgaris-Gulisporites—Flo—rinitesovalis，共计发现孢粉化石34属49种，其中蕨类植物孢子含量为51．6％～56．1％，裸子植物花粉含量为43．9％～48．4％。与大竹园组沉积时期相比，这一时期植被极为繁盛。根据孢粉组合特征，梁山组地质时代可能为早二叠世隆林期，即Kungurian期。

The materials in this paper were collected from the Lower Permian Dazhuyuan and Liangs- ban Formations in Wuchuan-Zheng＇an-Daozhen area, northern Guizhou Province. The sporo-pollen as- semblages are diverse, abundant, and well preserved in Liangshan Formation, but conversed to those in Dazhuyuan Formation. The palynological characteristic of the mentioned Formations can be summarized as follows： （1） The miospore populations of the Dazhuyuan Formation contain examples of species such as abundant Calamospora and Florinites, a little Torispora verrucosa, Gulisporites, Alisporites, Hamiapollen-ites and Striatopodocarpites, mainly occurring in the Upper Carboniferous to Lower Permian. According to the stratigraphic position of the Dazhuyuan Formation and miospore collected, its age should be correspond to the Early Permian Asselian to Artinskian （equivalent to the Zisong-Longlin stage）. （2） The Liangs- ban Formation contains miospores collectively named Laevigatosporites vulgaris-Gulisporites-Florinites oval- is assemblage. Compared with the preceding Dazhuyuan Formation, the vegetation became extremely diver- sified, as reflected by the numerous taxa of both pteridophytic spores and gymnospermous pollen-attaining to 49 species in 34 genera, and quantitatively to 51.6% -56.1% and 43.9% ~48.4% respectively. Jud- ging from the characteristic components of this assemblage, the Liangshan Formation is possibly correlated with Early Permian Longlinian of southern China （equivalent to the Kunguria Stage）.