湖南汝城盆地原定中侏罗世地层发现早白垩世孢粉组合
The discovery of Early Cretaceous spore- pollen assemblage in the Middle Jurassic strata of the Rucheng Basin, Hunan Province
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摘要: 通过对湖南汝城盆地原定为中侏罗统的李家洞水库剖面28 个孢粉样品的分析处理，发现24 个样品有孢粉化石，化石呈现早白垩世孢粉化石组合特征。发现的早白垩世特征分子有高含量的无突肋纹孢Cicatricosisporites，徐氏孢Hsuisporites，刺毛孢Pilosisporites，膜环弱缝孢Aequitriradites，二连粉Erlianpollis，有突肋纹孢Appendicisporites，微囊粉Parvisaccites，以及少量被子植物花粉。依据孢粉化石组合特征，建议将本剖面时代重新厘定为早白垩世。Abstract: The Lijiadong reservoir section of the Rucheng Basin in Hunan Province was originally considered to be of Middle Jurassic. Based on the analyses of 28 samples of spore-pollen collected from this section, the authors found abundant spore-pollen fossils from 24 of the samples. Among these fossils, the taxan Cicatricosisporites is most abundant, while the taxa Hsuisporites, Pilosisporites, Aequitriradites, Erlianpollis, Appendicisporites and Parvisaccites are highly abundant. In addition, a small number of angiosperm pollens were found in the sample. This fossil assemblage shows typical Early Cretaceous features. It is thus held that the geological age of Lijiadong reservoir section should be Early Cretaceous rather than Middle Jurassic.
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Key words:
- Early Cretaceous /
- spore-pollen assemblage /
- Rucheng Basin
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