摘要
窑街组是我国西北地区一套典型的中侏罗统含煤沉积序列。本文对其展开孢粉分析研究,结果显示总体以裸子植物松柏类Pseudopinus、Pinuspollenites、Pseudopicea、Protopicea和Podocarpidites为主,其次为以桫椤科/蚌壳蕨科Cyathidites/Deltoidospora为主的蕨类植被,其他零星出现有紫萁科Osmundacidites,杉科Perinopollenites和Taxodiaceaepollenites,掌鳞杉科Classopollis等。孢粉植物群总体指示相对温暖湿润的气候环境。而自下而上,孢粉植物群组成则显示显著变化,大致可划分为三个组合,分别为以两气囊、原始囊型花粉以及Chasmatosporites为主的松柏-银杏植物群,以Cyathidites/Deltoidospora为主的蕨类植物群以及以两气囊、原始囊型花粉为主的松柏类植物群。蕨类和松柏类植被反映截然不同的气候环境,因此植物群的纵向变化,进一步反映出中侏罗世窑街地区可能存在较大幅度气候变化。
The Middle Jurassic Yaojie Formation is a typical coal-bearing sedimentary sequences in Northwest China.This our study conducted palynological analysis,shows that the palynoflora mainly consists of gymnosperms(Pseudopinus,Pinuspollenites,Pseudopicea,Protopicea and Podocarpidites)while pteridophytas chiefly represented by Cyatheaceae/Dicksoniaceae(Cyathidites/Deltoidospora)come next.There are still a small number of Osmundaceae(Osmundacidites),Taxodiaceae(Perinopollenites and Taxodiaceaepollenites)and Cheirolepidiaceae(Classopollis).The palynoflora as a whole indicates a relatively humid and warm climatic environment.From bottom to top,the components of the palynoflora showed significant changes,which can be roughly divided into three assemblages,Conifers-Ginkgophytes flora with bisaccates,tunicates and Chasmatosporites,Cyathidites/Deltoidospora-based Ferns flora and Conifers flora dominated by bisaccates and tunicates.Ferns and conifers reflect different climatic environment.Therefore,the possibility of a largeer climate changes are reflected by this vertical diversification of flora during the Middle Jurassic in the Yaojie area
作者
杜圳
张明震
王森
李爱静
杜宝霞
雷向通
DU Zhen;ZHANG Mingzhen;WANG Sen;LI Aijing;DU Baoxia;LEI Xiangtong(School of Earth Science,Lanzhou University,Lanzhou 730000;Key Laboratory of Petroleum Resources,Gansu Province/Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou 730000;Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008)
出处
《微体古生物学报》
CSCD
北大核心
2018年第4期403-416,共14页
Acta Micropalaeontologica Sinica
基金
国家自然科学基金项目(编号:41602023
41872010)
中国科学院青年创新促进会联合资助~~
关键词
孢粉
古气候
侏罗纪
窑街组
甘肃
palynology
palaeoclimate
Jurassic
Yaojie Formation
Gansu Province
NW China
