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    辽西中生代软流圈底辟体的脉动式上涌

    邵济安 陈福坤 路凤香 周新华

    邵济安, 陈福坤, 路凤香, 周新华, 2006. 辽西中生代软流圈底辟体的脉动式上涌. 地球科学, 31(6): 807-816.
    引用本文: 邵济安, 陈福坤, 路凤香, 周新华, 2006. 辽西中生代软流圈底辟体的脉动式上涌. 地球科学, 31(6): 807-816.
    SHAO Ji-an, CHEN Fu-kun, LU Feng-xiang, ZHOU Xin-hua, 2006. Mesozoic Pulsative Upwelling Diapirs of Asthenosphere in West Liaoning Province. Earth Science, 31(6): 807-816.
    Citation: SHAO Ji-an, CHEN Fu-kun, LU Feng-xiang, ZHOU Xin-hua, 2006. Mesozoic Pulsative Upwelling Diapirs of Asthenosphere in West Liaoning Province. Earth Science, 31(6): 807-816.

    辽西中生代软流圈底辟体的脉动式上涌

    基金项目: 

    国家自然科学基金项目 40372103

    详细信息
      作者简介:

      邵济安(1940-),女,教授,构造地质专业. E-mail:wangcc@mail.tsinghua.edu.crl

    • 中图分类号: P588.14

    Mesozoic Pulsative Upwelling Diapirs of Asthenosphere in West Liaoning Province

    • 摘要: 岩石学-地球化学数据揭示了辽西中生代火山岩组分存在的3个特征: (1) Mg#值和Cr、Ni含量比较高; (2) 多数火山岩源自受到地壳物质混染的富集的岩石圈地幔; (3) 相当部分火山岩的εNd(t)值偏高.对辽西及其邻区中生代(230~65Ma) 火山岩年代学的研究发现: 火山活动具有平均间隔2030Ma的周期性, 火山岩活动的峰期为230Ma、190Ma、160Ma、130120Ma、110100Ma、80Ma.同时火山岩εNd(t)值在时间上显示了类似的周期性波动.在空间上, 中、新生代火山岩有呈环状分布的趋势, 从中心向外逐渐变新.根据上述特点, 提出辽西晚中生代的火山岩活动可能与软流圈底辟体脉动式上涌有关, 研究区被岩石圈断裂围限的特定构造背景为软流圈底辟体的上涌提供了天然通道.

       

    • 图  1  辽西主要断裂分布(辽宁省地质矿产局, 1989)

      1.义县组“高镁”玄武岩采样点; 2.阜新组亏损地幔玄武岩; 3.中生代火山沉积盆地

      Fig.  1.  Schematic map showing the distribution of main faults in West Liaoning

      图  2  Sr-Nd同位素组成

      Fig.  2.  Sr-Nd isotopic composition

      图  3  辽西火山岩Ba/Nb-La/Nb图解

      Fig.  3.  Ba/Nb-La/Nb diagram of volcanic rocks in West Liaoning Province

      图  4  中生代火山活动峰期及Nd同位素随时间变化的趋势

      Fig.  4.  Peak of volcanic activity and variation trend of Nd isotope with time

      图  5  辽西及邻区中新生代火山岩的环状分布

      Fig.  5.  Ring-like distribution of Mesozoic-Cenozoic volcanic rocks in Weste Liaoning and adjacent areas

      表  1  辽西中生代火山岩的某些组分参数

      Table  1.   Some composition parameters of Mesozoic volcanic rocks in West Liaoning

      表  2  辽西及邻区中新生代Sr-Nd同位素的时空分布

      Table  2.   Space-time distribution of the Mesozoic-Cenozoic Sr-Nd isotope in West Liaoning and adjacent areas

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