青海省早三叠世的孢子花粉及其地层意义

发布时间：2018-01-29 08:22

本文关键词： 生物地层孢粉地层划分早三叠世青海省　出处：《地层学杂志》2017年04期 　论文类型：期刊论文

【摘要】：青海省三叠纪地层发育、分布很广,占全省总面积的二分之一以上。原认为三叠纪地层以中、上三叠统为主,根据孢粉研究资料显示的特征修正为以下三叠统(包括部分原订为二叠纪的地层)为主,中、上三叠统次之或断续分布。首次对青海省的早三叠世孢子花粉组合,按地层分区进行了全面的归纳整理,识别出了5个地层群或组的9个孢粉组合,并讨论了其地层意义及对比等问题。华北区以下环仓组及赛尔贡切组组合为代表,分别以Lundbladispora或Aratrisporites的高含量为特征,并与少量Micrhystridium共生;过渡区以洪水川组的组合为代表,以Taeniaeporites及/或Limatulasporites/Tubermonocolpites的高含量为特征,并与少量Micrhystridium,Baltisphaeridium共存;华南区以下巴颜喀拉山群及池塘群组合为代表,以Lundbladispora较高含量为特征,并与Veryhachium为主的疑源类共存。同时讨论了孢粉的地层意义及对比等问题,建议将原布青山群划入下巴颜喀拉山群。
[Abstract]:The Triassic strata in Qinghai Province are developed and widely distributed, accounting for more than 1/2 of the total area of the province. It was originally considered that the Triassic strata were dominated by the Middle Triassic and the Upper Triassic. According to the sporopollen study data, the characteristics of the following Triassic (including some of the strata originally defined as Permian) are mainly corrected. The early Triassic spore pollen assemblage in Qinghai Province was summarized and sorted according to stratigraphic zoning for the first time, and 9 sporopollen assemblages of five stratigraphic groups or formations were identified. The stratigraphic significance and correlation are discussed. The assemblages of Huankang formation and Selgongche formation below North China are represented. It was characterized by high content of Lundbladispora or Aratrisporites and symbiotic with a small amount of Micrhystridium. The transition area is represented by the combination of flood and Sichuan formation. It was characterized by the high content of Taeniaeporites and / or Limatulasporites/Tubermonocolpites. And coexisted with a small amount of Micrhystrium Baltisphaeridium; The assemblage of Bayan Kara Mountain Group and Pond Group in South China is characterized by high Lundbladispora content. At the same time, the stratigraphic significance and correlation of sporopollen are discussed, and it is suggested that the original Buqingshan Group be included in the Lower Bayan Kara Group.
【作者单位】：青海省地质调查研究院;中国科学院南京地质古生物研究所;十堰市建筑设计研究院;
【基金】：中国科学院青年创新促进会,中国科学院战略先导专项(B)(No.XDB03010103) 国家自然科学基金(No.41530103,41530101,41372001)资助
【分类号】：P534.51
【正文快照】： (1)中国科学院青年创新促进会,中国科学院战略先导专项(B)(No.XDB03010103),国家自然科学基金(No.41530103,41530101,41372001)资助。青海省三叠纪地层非常发育、分布很广,出露面积占全省总面积的二分之一以上。20世纪70年代以来随着省内区域地质调查的开展,古生物研究展开了

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