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    北祁连造山带晚奥陶世-泥盆纪构造演化: 碎屑锆石年代学证据

    徐亚军 杜远生 杨江海

    徐亚军, 杜远生, 杨江海, 2013. 北祁连造山带晚奥陶世-泥盆纪构造演化: 碎屑锆石年代学证据. 地球科学, 38(5): 934-946. doi: 10.3799/dqkx.2013.092
    引用本文: 徐亚军, 杜远生, 杨江海, 2013. 北祁连造山带晚奥陶世-泥盆纪构造演化: 碎屑锆石年代学证据. 地球科学, 38(5): 934-946. doi: 10.3799/dqkx.2013.092
    XU Ya-jun, DU Yuan-sheng, YANG Jiang-hai, 2013. Tectonic Evolution of the North Qilian Orogenic Belt from the Late Ordovician to Devonian: Evidence from Detrital Zircon Geochronology. Earth Science, 38(5): 934-946. doi: 10.3799/dqkx.2013.092
    Citation: XU Ya-jun, DU Yuan-sheng, YANG Jiang-hai, 2013. Tectonic Evolution of the North Qilian Orogenic Belt from the Late Ordovician to Devonian: Evidence from Detrital Zircon Geochronology. Earth Science, 38(5): 934-946. doi: 10.3799/dqkx.2013.092

    北祁连造山带晚奥陶世-泥盆纪构造演化: 碎屑锆石年代学证据

    doi: 10.3799/dqkx.2013.092
    基金项目: 

    国家自然科学基金 41002030

    国家自然科学基金 40672080

    国家自然科学基金 40621002

    中国地质大学(武汉)优秀青年教师基金 CUGQNL0832

    详细信息
      作者简介:

      徐亚军(1978-), 男, 副教授, 主要从事造山带地质学研究

      通讯作者:

      杜远生, E-mail : duyuansheng126@126.com

    • 中图分类号: P51;P54

    Tectonic Evolution of the North Qilian Orogenic Belt from the Late Ordovician to Devonian: Evidence from Detrital Zircon Geochronology

    • 摘要: 北祁连造山带晚奥陶世-泥盆纪处于同造山的构造背景.上奥陶统-泥盆系沿造山带不对称分布.上奥陶统-泥盆系碎屑锆石年代学特征显示, 造山带东段武威一带上奥陶统底部沉积物主要来自北祁连岛弧, 南部中祁连地块和北部华北板块的沉积物在上奥陶统上部才出现, 根据同沉积锆石年龄将中祁连地块和华北板块在东段初始碰撞的时间限定在470~450 Ma之间; 中祁连地块和华北板块的物质在造山带西段肃南一带被保存在下志留统, 地层中也有大量来自早古生代北祁连岛弧和同碰撞花岗岩的物质, 暗示造山带西段的碰撞时间在早志留世.而造山带东段下志留统中却仅有来自中祁连地块和华北板块的物质, 缺乏代表北祁连岛弧的早古生代碎屑锆石年龄, 对比上奥陶统-下志留统岩相分布和碎屑锆石年代学特征, 北祁连造山带的碰撞具有"东早西晚"的"斜向碰撞、不规则边缘碰撞"的特征, 而这种碰撞方式导致中祁连地块在造山带东段仰冲到北祁连岛弧之上, 阻止北祁连岛弧为盆地提供沉积物; 泥盆纪早期, 北祁连岛弧年龄在东段下、中泥盆统中重新出现, 结合志留系和泥盆系在造山带东、西两段的分布和变形特征推断, 泥盆纪早期北祁连造山带具有"东强西弱"的不均一隆升特征, 这种差异隆升特征是由"东早西晚"的"斜向碰撞、不规则边缘碰撞"引起的, 它导致了北祁连岛弧在造山带东段被重新剥露出地表, 同时来自早期中、上志留统以及同碰撞花岗岩的物质也被汇入盆地.河西走廊盆地性质经历了弧后盆地-弧后残留洋盆-前陆盆地的转换过程.

       

    • 图  1  北祁连造山带构造分区与研究剖面分布(据冯益民和何世平, 1996修改)

      构造分区:A.河西走廊弧后盆地;B.岛弧;C.海沟俯冲杂岩.研究剖面位置:1.武威斜豪上奥陶统剖面;2.肃南志留系剖面;3.靖远下志留统和泥盆系剖面

      Fig.  1.  Tectonic framework of North Qilian orogenic belt and distribution of the studied sections

      图  2  北祁连造山带上奥陶统-泥盆系地层分布及样品分布

      Fig.  2.  The Upper Ordovician-Devonian distribution and sampling in the North Qilian orogenic belt

      图  3  北祁连造山带上奥陶统-泥盆系代表性碎屑锆石阴极发光(CL)图(年龄:Ma)

      Fig.  3.  CL images of representative zircons from the Upper Ordovician-Devonian, the North Qilian orogenic belt

      图  4  北祁连造山带上奥陶统-泥盆系碎屑锆石年龄谱

      Fig.  4.  Detrital zircon age spectra of the Upper Ordovician-Devonian strata, the North Qilian orogenic belt

      图  5  北祁连造山带及其临区前寒武岩浆及其变质事件年龄谱

      华北克拉通数据引自Guo et al., 2005; Hou et al., 2006; Wan et al., 2006a, 2006b; Tung et al., 2007a; 周红英等, 2007a, 2007bZhao et al., 2007, 2008; He et al., 2009; 中祁连地块数据引自Gehrels et al., 2003; Tseng et al., 2006; Tung et al., 2007b; Xu et al., 2007; 李怀坤等,2007王洪亮等,2007

      Fig.  5.  Precambrian magmatic and metamorphic events in the North Qilian orogenic belt and adjacent regions

      图  6  北祁连造山带造山模式与盆地转换

      Fig.  6.  Orogenic model and basin transition of the North Qilian orogenic belt

      图  7  中祁连地块与华北板块“斜向碰撞、不规则边缘碰撞”示意图(据Xu et al., 2010a)

      Fig.  7.  Collision between the Central Qilian block and North China Craton during the Ordovician-Silurian, showing diachronous collision from east to west

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    • 收稿日期:  2012-07-18
    • 刊出日期:  2013-09-15

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