摘要
近年来侏罗系已成为松辽盆地及外围油气勘探的新层系,为确定中侏罗世时期的古气候环境,对松辽盆地西缘索伦地区中侏罗统万宝组中的孢粉化石进行了详细研究,共识别出孢粉化石32属48种,其中蕨类植物孢子约占孢粉总数的46.01%,裸子植物花粉占孢粉总数的53.99%,蕨类植物的孢子略低于裸子植物花粉。孢粉组合以Cyclogranisporites-Protopinus-Pristinuspollenites为代表,推断索伦地区万宝组形成时代为中侏罗世。孢粉母体植物的生态环境研究表明,中侏罗统万宝组沉积时期,植被主要由针叶林和灌木丛构成,属于湿润的暖温带气候环境,为该地区中侏罗世古气候及古植被的恢复提供了新的证据。
In recent years,Jurassic strata have become a new layer for oil and gas exploration in Songliao Basin and its periphery.To determine the paleoclimate environment in the Middle Jurassic,we systematic analysized palynological fossils collected from the Middle Jurassic Wanbao Formation in Suolun region,the western margin of Songliao Basin.Totally 48 species of 32 genera,including 46.01%in pteridophyte spores and 53.99%in gymnosperm pollen,were recognized from the Wanbao Formation.The palynological assemblage is represented by Cyclogranisporites-Protopinus-Pristinuspollenites,indicating that the age of the Wanbao Formation in the Suolun region should be assigned to the Middle Jurassic.Combined with the features of the ecological environment,the Middle Jurassic Wanbao palynoflora mainly composed of coniferous forests and shrubs,could indicate a subhumid to humid warm temperate climate,providing new evidence for the recovery of the paleoclimate and paleovegetation of the Suolun region in the Middle Jurassic.
作者
施璐
唐振
张渝金
杨涛
杜玉春
于海涛
杜继宇
SHI Lu;TANG Zhen;ZHANG Yujin;YANG Tao;DU Yuchun;YU Haitao;DU Jiyu(Shenyang Center,China Geological Survey,Shenyang 110034,Liaoning,China;Northeast S&T Innovation Center,China Geological Survey,Shenyang 110034,Liaoning,China;College of Paleontology,Shenyang Normal University,Shenyang 110034,Liaoning,China;School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,Liaoning,China)
出处
《地质通报》
CAS
CSCD
北大核心
2023年第2期274-284,共11页
Geological Bulletin of China
基金
国家自然科学基金项目《大兴安岭中南部中侏罗世植物群及地层新探》(批准号:42172024)
中国地质调查局项目《内蒙古15万奈玛拉吉、巨里河、荷叶哈达幅区域地质调查》(编号:DD20190039-03)
《内蒙古15万楞吉曼达坂、吉日根林场、西马拉吐、乌兰沼、巴彦套海幅区域地质调查》(编号:DD20160048-02)。
关键词
孢粉化石
万宝组
中侏罗世
古气候
松辽盆地西缘
地质调查工程
palynological fossil
Wanbao Formation
Middle Jurassic
palaeoclimate
western margin of Songliao Basin
geological survey engineering
