施璐, 唐振, 张渝金, 杨涛, 杜玉春, 于海涛, 杜继宇. 松辽盆地西缘兴安盟索伦地区中侏罗统万宝组孢粉组合及其对古气候的指示[J]. 地质通报, 2023, 42(2-3): 274-284. DOI: 10.12097/j.issn.1671-2552.2023.2-3.008
    引用本文: 施璐, 唐振, 张渝金, 杨涛, 杜玉春, 于海涛, 杜继宇. 松辽盆地西缘兴安盟索伦地区中侏罗统万宝组孢粉组合及其对古气候的指示[J]. 地质通报, 2023, 42(2-3): 274-284. DOI: 10.12097/j.issn.1671-2552.2023.2-3.008
    SHI Lu, TANG Zhen, ZHANG Yujin, YANG Tao, DU Yuchun, YU Haitao, DU Jiyu. Palynological assemblages and their implications for paleoclimate of the Middle Jurassic Wanbao Formation in Suolun region, Hinggan League, the western margin of Songliao Basin[J]. Geological Bulletin of China, 2023, 42(2-3): 274-284. DOI: 10.12097/j.issn.1671-2552.2023.2-3.008
    Citation: SHI Lu, TANG Zhen, ZHANG Yujin, YANG Tao, DU Yuchun, YU Haitao, DU Jiyu. Palynological assemblages and their implications for paleoclimate of the Middle Jurassic Wanbao Formation in Suolun region, Hinggan League, the western margin of Songliao Basin[J]. Geological Bulletin of China, 2023, 42(2-3): 274-284. DOI: 10.12097/j.issn.1671-2552.2023.2-3.008

    松辽盆地西缘兴安盟索伦地区中侏罗统万宝组孢粉组合及其对古气候的指示

    Palynological assemblages and their implications for paleoclimate of the Middle Jurassic Wanbao Formation in Suolun region, Hinggan League, the western margin of Songliao Basin

    • 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。

       

      Abstract: 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.

       

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