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    扬子克拉通南华纪碎屑锆石U-Pb年龄、Hf同位素对华南新元古代岩浆事件的指示

    谢士稳 高山 柳小明 高日胜

    谢士稳, 高山, 柳小明, 高日胜, 2009. 扬子克拉通南华纪碎屑锆石U-Pb年龄、Hf同位素对华南新元古代岩浆事件的指示. 地球科学, 34(1): 117-126.
    引用本文: 谢士稳, 高山, 柳小明, 高日胜, 2009. 扬子克拉通南华纪碎屑锆石U-Pb年龄、Hf同位素对华南新元古代岩浆事件的指示. 地球科学, 34(1): 117-126.
    XIE Shi-wen, GAO Shan, LIU Xiao-ming, GAO Ri-sheng, 2009. U-Pb Ages and Hf Isotopes of Detrital Zircons of Nanhua Sedimentary Rocks from the Yangtze Gorges: Implications for Genesis of Neoproterozoic Magmatism in South China. Earth Science, 34(1): 117-126.
    Citation: XIE Shi-wen, GAO Shan, LIU Xiao-ming, GAO Ri-sheng, 2009. U-Pb Ages and Hf Isotopes of Detrital Zircons of Nanhua Sedimentary Rocks from the Yangtze Gorges: Implications for Genesis of Neoproterozoic Magmatism in South China. Earth Science, 34(1): 117-126.

    扬子克拉通南华纪碎屑锆石U-Pb年龄、Hf同位素对华南新元古代岩浆事件的指示

    基金项目: 

    教育部创新团队研究计划项目 IRT0441

    教育部创新团队研究计划项目 306021

    详细信息
      作者简介:

      谢士稳(1983—), 男, 硕士研究生在读, 岩石圈地球化学专业.E-mail: swxie210@163.com

    • 中图分类号: P597

    U-Pb Ages and Hf Isotopes of Detrital Zircons of Nanhua Sedimentary Rocks from the Yangtze Gorges: Implications for Genesis of Neoproterozoic Magmatism in South China

    • 摘要: 对采自宜昌三峡地区南华纪沉积岩中碎屑锆石进行了U-Pb定年,新元古代锆石U-Pb年龄在833Ma、785Ma出现高峰,说明此时期有两期大规模岩浆活动.结合前人的Hf同位素结果,新元古代锆石U-Pb年龄与εHf(t)值关系图表明: 910~890Ma之间锆石εHf(t)值表现为高正值(≈10,接近亏损地幔演化值),890~840Ma锆石εHf(t)值明显降低,并有负值出现,另外在890Ma处有年龄峰出现.笔者认为扬子和华夏板块的拼合可能在890Ma发生了由俯冲到陆-陆或陆-弧的碰撞,之前的高εHf(t)值由洋壳俯冲造成,之后碰撞作用陆壳物质熔融造成了εHf(t)值的降低; 840~800Ma的锆石εHf(t)值有正也有负,800~780Ma的锆石εHf(t)值小于0,780~750Ma的锆石εHf(t)值大于0.这些数据与830~795Ma、780~745Ma两期地幔柱事件吻合.

       

    • 图  1  黄陵背斜地质略图

      Fig.  1.  Simplified geological map of Huangling antidine

      图  2  锆石U-Pb年龄与Th/U比值关系

      Fig.  2.  Diagram showing relationship between Th/U ratios and U-Pb ages for detrital zircons

      图  3  碎屑锆石LA-ICP-MS U-Pb年龄谐和图

      Fig.  3.  U-Pb concordia plots of concordant detrital zircons

      图  4  新元古代锆石U-Pb年龄概率分布直方图

      Fig.  4.  Relative probability plots of Neoproterozoic U-Pb ages for concordant detrital zircons

      图  5  锆石U-Pb年龄与εHf (t)值关系

      Fig.  5.  Diagram showing relationship between εHf (t) valuesand U-Pb ages

      表  1  南沱组碎屑锆石U-Pb年龄和同位素比值

      Table  1.   U-Pb istope ratios and ages for ditrital zircons from Nantuo Formation

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