周口拗陷东部中新世孢粉组合及其意义

THE MIOCENE SPOROPOLLEN ASSEMBLAGES OF THE EASTERN ZHOUKOU DEPRESSION AND THEIR GEOLOGICAL SIGNIFICANCE

吴建庄 袁淑

Wu Jianzhuang Yuan Shu

地质矿产部华北石油地质局 郑州 450006

North China Bureau of Petroleum Geology, MGMG

首次报道了周口拗陷东部钻井剖面中具有中新世孢粉组合,从其特征中可分为上下二个组合,与其他地区对比可定为早期及中晚期,在此基础上对植被群生长环境进行研究,论述了此段地层沉积时代的古气候及古环境。

It is the first time to report that the sporopollen assemblages of the Guantao Formation have been discovered in the log section of the Eastern Zhoukou Depression. The assemblages can be divided into two groups. The lower group is in age of early Miocene depending on the correlation to the adjacent areas while the characteristics of the upper group are similar to those of the Shanwang Formation in Shandong provinc and the Taidao type (mid-Miocene) in Japan, and more similar to those of the late Neigene sporopollen assemblage (in age of mid-late Miocene) in the North Jiangsu-South Yellow Sea areas. It is proposed that the assemblage in age of early stage belongs to north subtropical type while that in age of mid-late stages are transformed from warm to cool zones based on the characteristics of their vertical distributions.

https://doi.org/10.11781/sysydz199301108