内蒙古集宁盆地阿尔布期—土伦期新地层的发现  

Discovery of a New Stratum of the Albian—Turonian Stage in the Jining Basin, Inner Mongolia

作　　者：李艳霞[1] 钟宁宁[1] 张枝焕[1] 刘琴[2] 周小惠[2] 陶明华[2] 

机构地区：[1]石油大学资源与信息学院,北京102249 [2]华北油田分公司勘探开发研究院,河北任丘062552

出　　处：《地质论评》2005年第1期77-85,i002,共10页Geological Review

摘　　要：在集宁盆地商都坳陷 ,首次应用丰富的孢粉、介形类和轮藻等化石资料论证并命名了一套新地层 ,自下而上为高勿素组和大囫囵组 ,在高勿素组中分别建立了孢粉 . Cyathidites- Aequitriradites- Pilosisporites-Tricolpopollenites组合 ;介形类 . Mongolocypris infidelis- M. tera- M. longa组合 ;轮藻 . Obtusocharaniaoheensis- Atopochara alanensis- Sphaerochara datongensis组合。在大囫囵组中建立了孢粉 . Schizaeoisporites-Taxodiaceaepollenites组合 ,包括 2个亚组合 ,即 1Cicatricosisporites- Classopollis亚组合 ,2 Tricolpites- Polyporites亚组合 ;介形类 . Mongolocypriscf. infidelis- M. cf. tera组合 ;轮藻 . Grambastichara yuntaishanensis- H ornicharaproductas- Raskyaechara wumengensis组合。根据上述微体古生物化石 ,认为高勿素组相当于早白垩世晚期的阿尔布期 。In the Shangdu depression of the Jining Basin, a new stratum has been found with abundant microfossils. The stratum has been first named after the “Gaowusu Formation” and “Dahulun Formation” from lower to upper by the authors. In the Gaowusu Formation the following fossil assemblages have been established: Polynology Ⅰ. the Cyathidites—Aequitriradites—Pilosisporites—Tricolpopollenites assemblage; Ostracodes Ⅰ. the Mongolocypris infidelis—M. tera—M. longa assemblage; CharophytesⅠ. the Obtusochara niaoheensis—Atopochara alanensis—Sphaerochara datongensis assemblage. In the Dahulun Formation the fossil assemblages established are: Polynology Ⅱ. the Schizaeoisporites—Taxodiaceaepollenites assemblage, which is further divided into 2 subassemblages: ① the Cicatricosisporites—Classopollis Subassemblage and ② the Tricolpites—Polyporites Subassemblage. Ostracodes Ⅱ. the Mongolocypris cf. infidelis- M. cf. tera assemblage. Charophytes Ⅱ. the Grambastichara yuntaishanensis—Hornichara productas—Raskyaechara wumengensis assemblage. According to the characteristics of the above fossil groups, the Gaowusu Formation is assigned in geological age to Albian of the late early Cretaceous and the Dahulun Formation is assigned to Cenomanian—Turonian of the early late Cretaceous.

关 键 词：土伦期 地层 盆地 内蒙古 微体古生物化石 早白垩世晚期 介形类 化石资料 晚白垩世 组合 孢粉 轮藻 CF 坳陷 

分 类 号：P534[天文地球—古生物学与地层学]