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    贵州漾头陡山沱组与留茶坡组界线凝灰岩的锆石U-Pb年龄及其地质意义

    陈灿 冯庆来 甘正勤

    陈灿, 冯庆来, 甘正勤, 2020. 贵州漾头陡山沱组与留茶坡组界线凝灰岩的锆石U-Pb年龄及其地质意义. 地球科学, 45(3): 880-891. doi: 10.3799/dqkx.2019.103
    引用本文: 陈灿, 冯庆来, 甘正勤, 2020. 贵州漾头陡山沱组与留茶坡组界线凝灰岩的锆石U-Pb年龄及其地质意义. 地球科学, 45(3): 880-891. doi: 10.3799/dqkx.2019.103
    Chen Can, Feng Qinglai, Gan Zhengqin, 2020. Zircon U-Pb Ages and Its Geological Significance of Tuffs between Doushantuo and Liuchapo Formations at Yangtou Section, Guizhou Province. Earth Science, 45(3): 880-891. doi: 10.3799/dqkx.2019.103
    Citation: Chen Can, Feng Qinglai, Gan Zhengqin, 2020. Zircon U-Pb Ages and Its Geological Significance of Tuffs between Doushantuo and Liuchapo Formations at Yangtou Section, Guizhou Province. Earth Science, 45(3): 880-891. doi: 10.3799/dqkx.2019.103

    贵州漾头陡山沱组与留茶坡组界线凝灰岩的锆石U-Pb年龄及其地质意义

    doi: 10.3799/dqkx.2019.103
    基金项目: 

    国家自然科学基金重点项目 41430101

    详细信息
      作者简介:

      陈灿(1993-), 男, 博士研究生, 主要从事华南埃迪卡拉纪-寒武纪地层学研究

      通讯作者:

      冯庆来

    • 中图分类号: P534.31

    Zircon U-Pb Ages and Its Geological Significance of Tuffs between Doushantuo and Liuchapo Formations at Yangtou Section, Guizhou Province

    • 摘要: 前寒武纪-寒武纪过渡时期是地质历史上最重要的转折期之一,对这一时期不同沉积相地层建立精确的对比标志,是理解寒武纪动物大爆发等一系列重大地质问题的关键.对贵州漾头剖面陡山沱组顶部和留茶坡组底部的两层凝灰岩中的锆石进行了LA-ICP-MS U-Pb年代学研究,分别获得了554.2±3.3 Ma和550.6±3.3 Ma的加权平均年龄,证明华南扬子地台深水相区留茶坡组开始沉积的时间约为550 Ma.扬子地台在埃迪卡拉纪-寒武纪过渡时期存在明显的台-盆沉积相分异,表明扬子地台在这一时期进入拉张的构造背景;因此,留茶坡组底部550.6±3.3 Ma的绝对年龄代表了扬子地台进入伸展构造背景和强烈海底热液活动开始的时间.另外,凝灰岩锆石微量元素特征显示,两层凝灰岩的源岩均属于花岗岩类,形成的大地构造背景属于岛弧环境或造山环境.

       

    • 图  1  华南扬子地台埃迪卡拉纪-寒武纪过渡时期古地理图(a)、漾头剖面及周边地质简图(b)和漾头剖面地层柱状图(c)

      图a修改自Jiang et al.(2011)

      Fig.  1.  Simplified paleographic map of the South China during the Ediacaran-Cambrian transition(a), geological map of the Yangtou section and surrounding areas (b)and stratigraphic column of the Yangtou section(c)

      图  2  漾头剖面留茶坡组与陡山沱组界线附近凝灰岩野外及镜下照片

      a.样品YT-7野外照片;b.样品YT-9野外照片;c、d.凝灰岩镜下的晶屑凝灰结构(YT-7,正交光);e.凝灰岩中的长石斑晶(YT-9, 单偏光);f.凝灰岩中的石英斑晶(YT-9,单偏光).图c~f中的比例尺为100 μm

      Fig.  2.  Field and microscopic photos of the tuffs between the Doushantuo and Liuchapo formations at the Yangtou section

      图  3  漾头剖面留茶坡组与陡山沱组界线附近凝灰岩中部分锆石的阴极发光和透射光照片

      红色圆圈代表激光斑束剥蚀位置,直径约32 μm

      Fig.  3.  Cathodoluminescence and transmission microscope images of zircons from tuffs at the Yangtou section

      图  4  漾头剖面留茶坡组与陡山沱组界线附近凝灰岩锆石U-Pb谐和图和206Pb/238U加权平均年龄

      Fig.  4.  Zircon U-Pb concordia diagrams and 206Pb/238U weighted average ages of tuffs between the Doushantuo and Liuchapo formations at the Yangtou section

      图  5  华南埃迪卡拉系-寒武系过渡时期区域地层对比

      Fig.  5.  Stratigraphy correlation during the Ediacaran-Cambrian interval in South China

      图  6  漾头剖面凝灰岩锆石微量元素特征判别图

      图a、b的底图据Belousova et al.(2002);图c、d的底图据Yang et al.(2012)

      Fig.  6.  Zircon trace element plots of tuffs at the Yangtou section

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    • 收稿日期:  2019-01-11
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