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内蒙古钱家店凹陷ML12井等12口井的孢粉材料,是目前所知该凹陷姚家组孢粉类型最丰富、数量最多且保存最完好的,已鉴定出孢粉共计116属,包括蕨类植物孢子51属、裸子植物花粉32属和被子植物花粉33属。根据姚家组中蕨类植物孢子分异度较高及相对含量较低、裸子植物花粉分异度较低及相对含量高、被子植物花粉分异度较低及相对含量波动幅度巨大的孢粉组合特征,将其命名为Exesipollenites-Nevesisporites-Retitricolpites组合。该组合与大庆长垣姚家组孢粉组合具有很好的横向对比性。以塔里木盆地西部东巴组中、下段被子植物花粉的演化阶段为参照标准,钱家店凹陷晚白垩世姚家组的孢粉组合时代应为晚白垩世Coniacian期—Santonian期。本文中的工作填补了钱家店凹陷姚家组孢粉组合研究的空白,并为深入认识我国北方区姚家组沉积时期植物群的特征提供了重要的证据。
The sporopollen materials of 12 wells such as ML12 well in the Qiajiandi Depression of Inner Mongolia are the most abundant, the most abundant and the best preserved in the Yaojia Formation in this depression. A total of 116 genera of sporopollen have been identified, including fern 51 species of plant spore, 32 species of gymnosperm pollen and 33 species of angiosperm pollen. According to the higher spore differentiation and lower relative content of ferns in Yaojia Formation, the pollen differentiation of gymnosperm is lower and the relative content is higher. The pollen diversity of angiosperm is lower and the relative content fluctuates greatly Combined features, named as Exesipollenites-Nevesisporites-Retitricolpites combination. The combination and the Daqing Changyuan Yaojia Formation sporopollen assemblage has good lateral contrast. Based on the evolution stage of angiosperm pollen in the middle and lower parts of the Dongba Formation in western Tarim Basin, the Sporopollen assemblage of the Late Cretaceous Yaojia Formation in the Qianjiadian Sag should be Late Cretaceous Coniacian-Santonian. The work in this paper fills in the blank of the study on the sporopollen assemblage in the Yaoji Formation of the Qianjiadian Depression, and provides important evidence for the further understanding of the characteristics of the flora in the sedimentary period of the Yaojia Formation in northern China.