摘要
孢粉分析鄂尔多斯盆地西南缘陇东地区钻孔中的保安群,在环河组和泾川组获得孢粉化石,并首次在罗汉洞组中获得孢粉化石.结果表明:保安群孢粉组合总体以裸子植物双囊型古松柏花粉为主,其次是Lygodiumaporites为主的蕨类植物孢子,通过对比分析认为该沉积的地质时代属于早白垩世早期,孢粉植物群总体反映当时气候相对凉爽湿润;厘定了白垩系保安群和六盘山群的对应关系,认为保安群泾川组与六盘山群上部的李洼峡组至乃家河组相当,保安群罗汉洞组上段与六盘山群和尚铺组相当,罗汉洞组下段与三桥组相当.
The fossil sporopollen collected from bore holes of the Huanhe and Jingchuan Formation,Baoan Group,in Longdong area,Ordos Basin,were analyzed.This is also the first report of fossil sporopollen from the Luohandong Formation.The results showed that palaeoconiferus pollen was dominant,followed by Pteridophyte spores represented by Lygodiumaporites.The results suggested that the deposit belonged to the early cretaceous.The sporopollen reflected a relatively cool and humid climate at that time.Based on previous data,the correspondence between the Baoan Group and Liupanshan Group in the cretaceous period was further determined:the Jingchuan Formation of the Baoan Group was equivalent to the Liwaxia Formation to Naijiahe Formation in the upper member of Liupanshan Group,the upper and the lower member of Luohandong Formation of Baoan Group were equivalent to the Heshangpu Formation and Sanqiao Formation of Liupanshan Group respectively.
作者
任文秀
胡永兴
杨涛
孙柏年
RenWen-xiu;Hu Yong-xing;Yang Tao;Sun Bai-nian(School of Earth Sciences,Lanzhou University,Lanzhou 730000,China;Geological Survey of Gansu Province,Lanzhou 730000,China)
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
2020年第4期444-452,共9页
Journal of Lanzhou University(Natural Sciences)
基金
中国地质调查局项目(DD20160128-07)
国家自然科学基金项目(41972010)
关键词
孢粉组合
地层意义
保安群
陇东地区
palynological assemblage
stratigraphic significance
Baoan Group
Longdong area
作者简介
任文秀(1981-),男,黑龙江庆安人,博士研究生,e-mail:ldwxren@163.com,研究方向为古生物与环境变化;通信联系人:孙柏年(1955-),男,山东沂水人,教授,博士研究生导师,e-mail:bnsun@lzu.edu.cn,研究方向为古生物与环境变化
