华北地块东北缘红庙子盆地鹰嘴砬子组孢粉化石

报道华北地块东北缘地区红庙子盆地鹰嘴砬子组的孢粉化石,建立了Cicatricosisporites-Abietineaepollenites-Piceites组合,该组合的主要特征为:以裸子类双气囊花粉和海金沙科孢子为主,含一定量裸子类无气囊花粉,未见被子类花粉,孢粉组合特征可与松辽盆地沙河子组对比。一些具有早白垩世时代意义的孢粉化石,如Cicatricosisporites sp.,Cicatricosisporites undulates和Cicatricosisporites implexus的出现,表明鹰嘴砬子组的地质时代为早白垩世。根据孢粉化石资料,推测华北地块东北缘地区在鹰嘴砬子组沉积时期古植被面貌以松科和杉科组成的松柏类针叶林为主,林下生长着真蕨类。古气候相当于湿润-半湿润的亚热带气候。

Palynological fossils from the Yingzuilazi Formation in Hongmiaozi Basin,northeastern margin of North China Block

This paper reports the palynological fossils found from the Yingzuilazi Formation in Hongmiaozi Basin on the northeastern margin of North China Block, and recognizes a palynological assemblage named Cicatricosisporites-Abietineaepollenites-Piceites. This assemblage is characterized by the dominance of disaccites gymnosperm pollen and Lygodiaceae spore and the moderate abundance of pollen without sacci, with no angiosperm pollen found. The characteristics of this palynological assemblage can be correlated with those of Shahezi Formation in Songliao Basin. The geological age of Yingzuilazi Formation is considered to be Early Cretaceous, as shown by the existence of some typical Early Cretaceous palynological fossils, such as Cicatricosisporites sp., Cicatricosi-sporites undulates and Cicatricosisporites implexus. On the basis of the composition of this assemblage, the authors hold that, during the deposition period of Yingzuilazi Formation, the vegetation was mainly Pinaceae and Taxodiaceae coniferous forests, with a few understory Filicales, the climate was of subtropical zone, and the environment probably had humid or semi-humid features on the northeastern margin of North China Block.