摘要
在区域地层划分与对比中 ,内蒙古固阳盆地缺少下第三系 .本次研究在前人划分的早白垩世李三沟组中 ,识别出一套杂色碎屑岩系 ,重点对这套地层特征、沉积层序、古生物组合、成岩性及构造样式等特征展开了研究 ,发现该套地层不整合于早白垩世地层之上 ,具有胶结松散、成岩性差、构造样式简单 (以断块运动为主 )、孢粉组合以被子植物花粉和草本植物花粉为主等特征 .在生物组合、成岩性及构造样式等方面与早白垩世李三沟组明显不同 .根据生物组合特征 ,其形成时代应为老第三纪的渐新世 .
In the regional stratigraphic classification and correlation, the Lower Tertiary strata are absent in Guyang basin, Inner Mongolia. A suite of patchy_colour detrital rock system is identified in the Early Cretaceous Lisangou Formation determined by our predecessors. The present research into the stratigraphic features, sedimentary sequence, paleontologic assemblage, diagenesis and tectonic pattern of the said strata shows that this suite of strata overlying unconformably the Early Cretaceous Lisangou Formation is characterized by loose cementation, poor diagenesis, simple tectonic style (dominated by the fault_block movement) and Angiosperm_herb pollen assemblage. Furthermore, the distinctive differences are present between this suite of strata and the Early Cretaceous Lisangou Formation in terms of biological assembly, diagenesis and tectonic pattern. The analysis of the biologic assemblage of this suite of strata indicate the formation age of the strata at the Early Tertiary.
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
2000年第3期242-246,共5页
Earth Science-Journal of China University of Geosciences
基金
地质矿产部"内蒙古固阳地区三幅 1:5万联测"项目
关键词
内蒙古
固阳盆地
下第三系
地质意义
Lower Tertiary
biological assemblage
Lisangou Formation
Guyang basin.
