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    华北克拉通南缘古元古代晚期汝阳群微体化石及其古环境意义:来自微细构造和生物标志化合物的证据

    李猛 王钊飞 姚志亮

    李猛, 王钊飞, 姚志亮, 2021. 华北克拉通南缘古元古代晚期汝阳群微体化石及其古环境意义:来自微细构造和生物标志化合物的证据. 地球科学, 46(11): 4072-4083. doi: 10.3799/dqkx.2021.006
    引用本文: 李猛, 王钊飞, 姚志亮, 2021. 华北克拉通南缘古元古代晚期汝阳群微体化石及其古环境意义:来自微细构造和生物标志化合物的证据. 地球科学, 46(11): 4072-4083. doi: 10.3799/dqkx.2021.006
    Li Meng, Wang Zhaofei, Yao Zhiliang, 2021. Microfossils and Paleoenvironmental Significance of Late Paleoproterozoic Ruyang Group in South Margin of North China Craton: Evidence from Microstructure and Biomarker. Earth Science, 46(11): 4072-4083. doi: 10.3799/dqkx.2021.006
    Citation: Li Meng, Wang Zhaofei, Yao Zhiliang, 2021. Microfossils and Paleoenvironmental Significance of Late Paleoproterozoic Ruyang Group in South Margin of North China Craton: Evidence from Microstructure and Biomarker. Earth Science, 46(11): 4072-4083. doi: 10.3799/dqkx.2021.006

    华北克拉通南缘古元古代晚期汝阳群微体化石及其古环境意义:来自微细构造和生物标志化合物的证据

    doi: 10.3799/dqkx.2021.006
    基金项目: 

    国家自然科学基金项目 41602005

    陕西省自然科学基金项目 S2019-JC-QN-2490

    中国地质调查局项目 DD20190065

    中国地质调查局项目 DD2016002

    详细信息
      作者简介:

      李猛(1986-), 男, 高级工程师, 主要从事前寒武纪地质研究.ORCID: 0000-0003-1986-5509.E-mail: lm27010501@sina.com

    • 中图分类号: P52

    Microfossils and Paleoenvironmental Significance of Late Paleoproterozoic Ruyang Group in South Margin of North China Craton: Evidence from Microstructure and Biomarker

    • 摘要: 华北克拉通南缘古元古代晚期汝阳群白草坪组页岩中产出大量的具刺和细网状纹饰的球形疑源类,其中以Shuiyousphaeridium macroreticulatumDictyosphaera macroreticulata化石标本最具代表性.利用扫描电子显微镜结合光学生物显微镜对其膜壳微细构造进行观察,结果显示:膜壳表面的刺饰形态具有多样性分叉;其膜壳壁可能是由多边形网脊及膜层构成,而不是由多角形板片及膜层构成.同时通过对比研究,认为两种最具代表性的特征分子可能是同一生物不同阶段的产物.此外,通过对赋存微体化石页岩进行生物标志化合物分析,检测到的姥鲛烷/植烷比(Pr/Ph)大于1、伽马蜡烷丰度中等及生物标志化合物(C30藿烷、C27甾烷和三环萜烷),结合前人关于汝阳群沉积环境的研究,不仅指示了汝阳群微体化石群沉积古环境应为正常的海洋环境——滨海-浅海相,也指示了元古代真核生物已经存在,为重建微体化石群和探讨早期生命演化提供了重要的理论依据.

       

    • 图  1  研究区地质简图和汝阳群岩性柱状图

      a.示水幽沟剖面;b.示罗圈村剖面

      Fig.  1.  Simplified geological map of the sections and stratigraphic column of Ruyang Group

      图  2  大型网面水幽球藻(Shuiyousphaeridium macroreticulatum)在SEM下刺饰特征一

      a,b,d~i. 09710-7-018;b,d~i. 图a的局部放大,均显示其膜壳表面刺饰(除图i显示膜壳表面网状纹饰);c. 膜壳表面刺饰形态示意图. 单线比例尺=10 μm;双线比例尺=1 μm.以上标本均采自水幽沟剖面

      Fig.  2.  (Feature i) Processes on the wall of Shuiyousphaeridium macroreticulatum under the SEM

      图  3  大型网面水幽球藻(Shuiyousphaeridium macroreticulatum)在SEM下刺饰特征二

      a,b,d~i. 09710-7-024;b,d~i. 图a的局部放大,均显示其膜壳表面刺饰(除图i显示膜壳表面网状纹饰);c.膜壳表面刺饰形态示意图. 单线比例尺=10 μm;双线比例尺=1 μm. 以上标本均采自罗圈村剖面

      Fig.  3.  (Feature ii) Processes on the wall of Shuiyousphaeridium macroreticulatum under the SEM

      图  4  精细网球藻(Dictyosphaera macroreticulata)在光学显微镜与SEM下网格纹饰特征

      a. G0977-40;b. 图a的局部放大,示膜壳表面的网格状纹饰;c. G09710-14-7;d~f. 0977-17,e~f. 图d的局部放大,图f中黄色箭头方向指示膜壳表面凸起的网脊;g. 0977-12;h. 0977-17-1,黄色箭头方向指示膜壳表面凸起的网脊;i.09710-19-17;j. 09710-19-10;k. 09710-7-17;l. 09710-7-20;m. 0977-8;n. 09710-7-9;o. 09710-23-18,黄色箭头方向指示膜壳内层网格形态. 黑色单线比例尺=50 μm;白色单线比例尺=10 μm;双线比例尺=1 μm. 以上标本均采自罗圈村剖面

      Fig.  4.  Reticulate on the wall of Dictyosphaera macroreticulata under the optical microscope and the SEM

      图  5  ShuiyousphaeridiumDictyosphaera macroreticulata之间的“过渡”类型

      a. 09710-7-024;b. 09710-7-031;c. G09710-28;d,k. 09710-23,k是图d的局部放大;e. G09710-19;f. G09710-32;g,l. 09710-23,l是图g的局部放大;h. G09710-28;i. G09710-16;j. 0977-12.图a,b,d,g,j~l中,单线比例尺=10 μm;图c,e,f,h中,单线比例尺=100 μm;图i中,单线比例尺=50 μm.图中黄色方框指示放大部分,黄色箭头指示膜壳表面的刺体.其中,图c,e,f,h,i为光学显微镜照片,其他均为光学显微镜照片.以上标本均采自罗圈村剖面

      Fig.  5.  Transitional type between Shuiyousphaeridium and Dictyosphaera macroreticulata

      图  6  烷烃总离子流图与链烷烃分布

      Pr为姥鲛烷;Ph为植烷;C17为正构烷烃

      Fig.  6.  The total ion current of alkane and the distribution of chain alkane

      图  7  萜类烃(m/z191)与甾类烃(m/z217)质量色谱图

      H30代表C30藿烷;T21、T23代表三环萜烷;S27代表C27甾烷

      Fig.  7.  The mass chromatogram of terpene hydrocarbons and steroid hydrocarbons

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    出版历程
    • 收稿日期:  2021-01-05
    • 网络出版日期:  2021-12-04
    • 刊出日期:  2021-11-30

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