摘要
本文主要对山东彭庄煤矿西补15井太原组上部以及山西组进行采样研究,共分析孢粉样品14块,所有样品中均含有较为丰富的孢粉化石;经分析鉴定,共发现孢粉化石37属107种及部分未定种;根据孢粉化石在地层中的纵向分布规律及其含量变化,自下而上建立两个孢粉组合:Ⅰ.Laevigatosporites-Granulatisporites组合(太原组上部),Ⅱ.Gulisporites cochlearius-Leiotriletes adnatus-Sinulatisporites sinensis组合(山西组);并将本区孢粉组合特征与华北其他地区进行了比较;明确了本区孢粉组合的地质时代,组合Ⅰ为早二叠世晚期,组合Ⅱ为中二叠世早期,即本区下、中二叠统界线应置于山西组底部泥岩之底;最后,根据孢粉特征恢复了相应地质时期的古气候,继而进一步佐证了本区下、中二叠统界线。
The upper part of the Permian Taiyuan and Shanxi formations at Xibu 15 well in the Pengzhuang Coalfield,Shandong Province were studied. Fourteen samples were collected and all the samples contain relatively abundant sporomorph. The 37 genera and the 107 species of sporopollen fossils have been found after identification. According to the content change and vertical variation of sporopollen fossils in the strata,the sporopollen may be distinguished into two assemblages as follows（in ascending order）： I. Laevigatosporites-Granulatisporites （the upper part of the Taiyuan Formation）, II. Gulisporites cochlearius-Leiotriletes adnatus-Sinulatisporites sinensis （the Shanxi Formation）. The main characteristics of the sporopollen assemblages in this area can be compared with that in other areas in North China. The geological time of the sporopollen assemblages should be the late Early Permian（assemblage I ） and the early Middle Permian（assemblage II ）. Namely,the boundary between the Lower and Middle Permian in the Pengzhuang Coalfield should be placed at the bottom of the mudstone in the lower portion of the Shanxi Formation. Lastly, the palaeoclimatic pattern reconstructed by sporopollen characteristics provides further evidence for the boundary between the Lower and Middle Permian in this area.
出处
《地质学报》
EI
CAS
CSCD
北大核心
2013年第12期1819-1825,共7页
Acta Geologica Sinica
基金
现代古生物学与地层学国家重点实验室(中国科学院南京地质古生物研究所)开放课题(编号123104)资助的成果
关键词
二叠纪
孢粉组合
太原组
山西组
山东彭庄
Permian
sporopollen assemblage
Taiyuan Formation
Shanxi Formation
Pengzhuang of Shandong Province
