北京千家店盆地土城子组孢粉组合、时代及气候

贺瑾瑞; 南赟; 郝春燕; 宋庆伟; 焦润成; 李良景; 冉淑红; 程素珍; 吴家悦

北京千家店盆地土城子组孢粉组合、时代及气候

Pollen and spore assemblages ages and climate of Tuchengzi Formation in Qianjiadian Basin Beijing

摘要

摘要: 北京千家店盆地土城子组二段的孢粉组合共计12属8种及6种未定种。化石组合以克拉梭粉（Classopollis spp.）在组合中占绝对优势（90%以上），另有一些松柏类的无肋双囊粉，蕨类植物孢子极少，属种分异度及含量远低于裸子植物花粉，仅占孢粉组合的2.13%。当前孢粉组合为Classopollis高峰组合，时代应属晚侏罗世早期。另外，结合区内其他生物化石分析，认为土城子期在北方整体较干旱或半干旱的气候条件下，至少在该地区局部有湖泊气候的存在。

Abstract: In this paper, pollen and spore assemblages of the first and second members of Tuchengzi Formation in Qianjiadian Basin, Yanqing, Beijing, were studied an discussed.There are 12 genera, 8 species and 6 undetermined species of pollen and spore in the strata.The dominant pollen and spore assemblage isClassopollis spp.(over 90%), and secondary pollen is riblessbicapsular pollen of some conifers.Fern spores are very few, whose genus and species differentiation and content are much lower than those of gymnosperm pollen, accounting for only 2.13% of pollen and spore assemblage.The current pollen and spore assemblage is peak-time Classopollis assemblage.It is inferred that its age is early stage of late Jurassic.Based on the analysis of other fossils in the area, it is considered that, under the wholly arid or semi-arid climate conditions of Tuchengzi Period, there at least existed local lake climate.

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