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    祁连山东南段加里东造山期构造变形年代的精确限定及其意义

    樊光明 雷东宁

    樊光明, 雷东宁, 2007. 祁连山东南段加里东造山期构造变形年代的精确限定及其意义. 地球科学, 32(1): 39-44.
    引用本文: 樊光明, 雷东宁, 2007. 祁连山东南段加里东造山期构造变形年代的精确限定及其意义. 地球科学, 32(1): 39-44.
    FAN Guang-ming, LEI Dong-ning, 2007. Precise Timing and Significance of Caledonian Structural Deformation Chronology in Southeast Qilian. Earth Science, 32(1): 39-44.
    Citation: FAN Guang-ming, LEI Dong-ning, 2007. Precise Timing and Significance of Caledonian Structural Deformation Chronology in Southeast Qilian. Earth Science, 32(1): 39-44.

    祁连山东南段加里东造山期构造变形年代的精确限定及其意义

    基金项目: 

    中国地质调查局基金项目 200213000016

    中国地质调查局基金项目 200413000007

    详细信息
      作者简介:

      樊光明(1952-),男,教授,长期从事构造地质学的教学和构造地质、区域地质调查及工程地质构造等科研工作.E-mail:grnfan@126.coin

    • 中图分类号: P597.3

    Precise Timing and Significance of Caledonian Structural Deformation Chronology in Southeast Qilian

    • 摘要: 祁连山东南段呈北西-南东向展布着加里东期中祁连造山带和拉脊山造山带, 其基底为前加里东变质岩系, 在该变质结晶基底岩系中发育着菱形网格状韧性剪切带, 共轭韧性剪切带面对缩短方向的夹角为104°~114°, 其最大主应力方位为SW210°左右.在中祁连地块金沙峡和化隆地块科却两处韧性剪切带中的糜棱岩化岩石, 获取变质矿物白云母40Ar-39Ar坪年龄分别为(405.1±2.4) Ma和(418.3±2.8) Ma.这一年代学结果不仅确定了加里东基底变质岩系中韧性剪切带是加里东造山作用过程中形成, 更重要的是通过对基底韧性剪切带中变质变形岩石的年代学研究, 精确地限定了祁连山东南段的早古生代火山盆地(或岛弧盆地)、拉脊山小洋盆关闭的构造年代.这为造山带构造演化过程中盆地关闭时间的确定开辟了新的途径.

       

    • 图  1  研究区地质简图、样品编号和年龄结果及对应的采样位置

      1.中新生界/三叠系隆务河群; 2.上泥盆统牦牛山组、上泥盆统-上三叠统; 3.中奥陶统-下志留统、下奥陶统阴沟群; 4.寒武系-志留系/未分超基性岩; 5.蓟县系; 6.古元古界秦岭岩群、湟源岩群; 7.新太古界-古元古界化隆岩群; 8.上奥陶统花岗闪长岩; 9.中奥陶统花岗闪长岩; 10.下奥陶统闪长岩; 11.前加里东花岗岩; 12.前加里东花岗闪长岩; 13.加里东期背斜、向斜构造; 14前加里东期背斜、向斜构造; 15.加里东期挤压构造面理; 16.前加里东期挤压构造面理; 17.新太古界-古元古界化隆岩群挤压构造面理; 18.大断裂和一般断裂; 19.走滑构造/逆冲构造; 20.韧性剪切带

      Fig.  1.  Schematic geologic map of studying area, sample numbers and age data and corresponding sampling sites

      图  2  李家沟及金沙峡地质构造剖面图

      a.化隆地块李家沟-拉昂地质构造剖面; b.中祁连金沙峡观察点2229-2230地质构造剖面; 1.砂砾岩; 2.砂岩; 3.花岗闪长岩; 4.黑云母石英片岩; 5.花岗片麻岩; 6.条带状混合岩; 7.片麻岩; 8.大理岩; 9.韧性剪切带; 10.白云母测试年龄样及样品编号

      Fig.  2.  Geologic structural sections in Lijiagou and Jinshaxia

      图  3  品7300一2白云母年龄图解

      Fig.  3.  uscovite age diagram of sample 7300—2

      图  4  品2229—1白云母年龄图解

      Fig.  4.  Muscovite age diagram of sample 2229—1

      表  1  样品2229-1和7300-240Ar/39Ar逐段加热分析数据

      Table  1.   40Ar/39Ar analysis data of processed heating to samples 2229-1 and 7300-2

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    出版历程
    • 收稿日期:  2006-06-02
    • 刊出日期:  2007-01-25

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