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    东乌旗罕乌拉韧性剪切带的构造属性及其年代约束

    程银行 滕学建 李艳锋 杨俊泉 刘洋 彭丽娜 李影 李敏

    程银行, 滕学建, 李艳锋, 杨俊泉, 刘洋, 彭丽娜, 李影, 李敏, 2014. 东乌旗罕乌拉韧性剪切带的构造属性及其年代约束. 地球科学, 39(4): 375-386. doi: 10.3799/dqkx.2014.036
    引用本文: 程银行, 滕学建, 李艳锋, 杨俊泉, 刘洋, 彭丽娜, 李影, 李敏, 2014. 东乌旗罕乌拉韧性剪切带的构造属性及其年代约束. 地球科学, 39(4): 375-386. doi: 10.3799/dqkx.2014.036
    Cheng Yinhang, Teng Xuejian, Li Yanfeng, Yang Junquan, Liu Yang, Peng Li'na, Li Ying, Li Min, 2014. Chronology Constraint and Tectonic Evolution of Hanwula Early Cretaceous Ductile Shear Belt in Dong Ujimqin, Inner Mongolia. Earth Science, 39(4): 375-386. doi: 10.3799/dqkx.2014.036
    Citation: Cheng Yinhang, Teng Xuejian, Li Yanfeng, Yang Junquan, Liu Yang, Peng Li'na, Li Ying, Li Min, 2014. Chronology Constraint and Tectonic Evolution of Hanwula Early Cretaceous Ductile Shear Belt in Dong Ujimqin, Inner Mongolia. Earth Science, 39(4): 375-386. doi: 10.3799/dqkx.2014.036

    东乌旗罕乌拉韧性剪切带的构造属性及其年代约束

    doi: 10.3799/dqkx.2014.036
    基金项目: 

    内蒙古1∶5万沙麦 1212011120697

    奥尤特区调项目 1212011220446

    详细信息
      作者简介:

      程银行(1982-),男,助理研究员,地质学专业,主要从事矿产地质调查与研究工作.E-mail: weicheng1858@163.com

    • 中图分类号: P542

    Chronology Constraint and Tectonic Evolution of Hanwula Early Cretaceous Ductile Shear Belt in Dong Ujimqin, Inner Mongolia

    • 摘要: 为研究东乌旗北部罕乌拉韧性剪切带的运动学性质及其时代,通过野外宏观调查和定向标本显微分析来研究花岗质糜棱岩的宏观-微观变形构造特征,并对经韧性剪切作用的花岗质糜棱岩进行LA-MC-ICPMS锆石U-Pb定年.研究表明花岗质糜棱岩的长石、石英等主要造岩矿物具塑性变形和动态生长的特征,发育典型的“σ”、“δ”和“S-C”组构,对研究区34组糜棱面理和线理数据进行赤平投影,剪切面(C面)平均面理产状为338°∠24°,线理产状为303°∠17°,显示出左行滑脱型韧性剪切带的特征;锆石U-Pb测年结果表明韧性剪切作用之前就位的花岗质岩石成岩年龄为135.9±1.2 Ma~130.0±0.5 Ma,属早白垩世,且该剪切带被下白垩统大磨拐河组(相当于凡兰吟期-欧特里沃期)砂砾岩覆盖.综上所述,结合最新区域研究成果认为,早白垩世(135.9±1.2 Ma~130.0±0.5 Ma)东乌旗地区经历了大规模左行伸展构造活动,这一成果深化了对该区早白垩世地壳构造演化的认识.

       

    • 图  1  罕乌拉韧性剪切带地质简图(据滕学建等内蒙古东乌旗罕乌拉早白垩世韧性剪切带1∶1万地质图,2012改编)

      1.早白垩世二长花岗岩;2.早白垩世糜棱岩化二长花岗岩;3.早白垩世花岗质初糜棱岩;4.早白垩世花岗质糜棱岩;5.下白垩统大磨拐河组(K1d)砂砾岩;6.构造剖面;7.野外采样;8.糜棱线理面理产状;9.第四系;c.研究区糜棱面理、矿物拉伸线理的极射赤平投影(吴氏网,下半球)

      Fig.  1.  Geological sketch map of ductile shear zone in Hanwula area

      图  2  罕乌拉韧性剪切带剖面简图(图例同图 1)

      Fig.  2.  The sectional drawing of ductile shear zone in Hanwula area

      图  3  罕乌拉韧性剪切带宏观构造特征

      a、b.强应变带弱变形域;c.强应变带中不对称褶皱和石香肠构造;d.“A”型褶皱指示左行剪切方向;e、f.“δ”、“σ”旋转残斑运动指向;g.弱变形域中沿糜棱面理发育长英质石香肠构造;h.弱变形域中“S-C”、“S-L”、“L”组构运动指向(镜头方向均为50°~70°)

      Fig.  3.  Macroscopic structures of ductile shear zone in Hanwula area

      图  4  罕乌拉韧性剪切带微观构造特征

      a.钾长石卡式双晶,绢云母、黑云母绕晶定向分布;b.显微拉张和剪切破裂,斜长石残斑中张性破裂被新生石英充填;c.山羊须结构,钾长石两端被拉断,空隙被新生石英充填;d.眼球状斜长石残斑及其边部石英亚颗粒,石英、黑云母定向绕晶排列;e.钾长石残斑内的蠕虫状石英,蠕英交代结构;f.显微尺度反“S”型“S-C”组构运动指向,石英呈似透镜状定向分布

      Fig.  4.  Microstructures of ductile shear zone in Hanwula area

      图  5  罕乌拉地区花岗质糜棱岩部分锆石阴极发光图像

      Fig.  5.  CL images of selected zircons for granitic mylonites in Hanwula areas

      图  6  罕乌拉地区花岗质糜棱岩锆石U-Pb年龄谐和图

      Fig.  6.  Zircon U-Pb concordia diagrams of the granitic mylonites in Hanwula areas

      图  7  罕乌拉韧性剪切带韧性变形时间上限的地质证据

      a.大磨拐河组(K1d)砂砾岩中花岗质糜棱岩砾岩;myl.花岗质糜棱岩;b.石英脉截切韧性剪切带糜棱面理;Kf.钾长石;Q.条带状石英、石英脉;C.糜棱面理;L.石英拉伸线理;c.最大压扁面,钾长石旋转碎斑,石英拉伸线理(L)和眼球状石英

      Fig.  7.  Geologic evidences on the ductile shear timing in Hanwula area

      表  1  罕乌拉地区花岗质糜棱岩LA-MC-ICPMS锆石U-Pb同位素分析结果

      Table  1.   LA-MC-ICPMS zircon U-Pb dating results of granitic mylonites in Hanwula area

      测点号 元素含量及比值 同位素比值 年龄(Ma)
      U(10-6) Th(10-6) 232Th/238U 206Pb/238U ±1σ 207Pb/235U ±1σ 207Pb/206Pb ±1σ 206Pb/238U ±1σ 207Pb/235U ±1σ
      1503.1.1 771 1 176 1.525 1 0.020 4 0.000 2 0.136 1 0.004 3 0.048 4 0.001 5 130 1 130 4
      1503.1.2 1 730 3 686 2.130 2 0.020 4 0.000 2 0.136 9 0.002 1 0.048 6 0.000 7 130 1 130 2
      1503.1.3 902 1 135 1.258 5 0.020 6 0.000 2 0.136 7 0.002 9 0.048 2 0.001 0 131 1 130 3
      1503.1.4 358 433 1.209 2 0.020 4 0.000 4 0.137 2 0.012 5 0.048 8 0.004 4 130 2 131 12
      1503.1.5 636 983 1.546 6 0.020 4 0.000 2 0.137 3 0.005 0 0.048 9 0.001 8 130 1 131 5
      1503.1.6 1 166 1 921 1.646 6 0.020 5 0.000 2 0.136 7 0.003 1 0.048 5 0.001 1 131 1 130 3
      1503.1.7 1 814 1 169 0.644 5 0.026 3 0.000 3 0.179 6 0.002 0 0.049 6 0.000 5 167 2 168 2
      1503.1.8 723 1 006 1.392 4 0.020 4 0.000 2 0.136 5 0.004 1 0.048 6 0.001 4 130 1 130 4
      1503.1.9 391 620 1.587 0 0.020 7 0.000 3 0.137 6 0.012 8 0.048 2 0.004 5 132 2 131 12
      1503.1.10 751 1 496 1.993 3 0.020 4 0.000 2 0.137 2 0.003 1 0.048 8 0.001 1 130 1 131 3
      1503.1.11 744 1 330 1.787 2 0.020 4 0.000 2 0.136 7 0.003 9 0.048 5 0.001 4 130 1 130 4
      1503.1.12 730 1 208 1.654 7 0.020 5 0.000 2 0.136 3 0.005 5 0.048 3 0.001 9 131 1 130 5
      1503.1.13 829 1 507 1.818 2 0.020 5 0.000 1 0.136 8 0.003 1 0.048 5 0.001 1 131 1 130 3
      1503.1.14 733 1 229 1.676 2 0.020 4 0.000 2 0.136 5 0.003 5 0.048 5 0.001 3 130 1 130 3
      1503.1.15 504 653 1.295 3 0.020 2 0.000 3 0.136 3 0.011 6 0.048 9 0.004 4 129 2 130 11
      1503.1.16 704 868 1.233 0 0.020 5 0.000 2 0.138 0 0.003 7 0.048 8 0.001 3 131 1 131 4
      1503.1.17 673 933 1.387 3 0.020 3 0.000 2 0.137 1 0.003 7 0.049 1 0.001 3 129 1 130 4
      1503.1.18 1 029 1 739 1.690 6 0.019 7 0.000 2 0.137 5 0.005 3 0.050 5 0.001 9 126 1 131 5
      1503.1.19 625 39 0.062 8 0.020 4 0.000 2 0.136 6 0.006 4 0.048 6 0.002 3 130 2 130 6
      1503.1.20 516 601 1.163 0 0.020 1 0.000 2 0.136 6 0.005 0 0.049 3 0.001 8 128 1 130 5
      1503.1.21 486 574 1.181 6 0.020 5 0.000 3 0.136 5 0.007 5 0.048 4 0.002 6 131 2 130 7
      1503.1.22 801 1 650 2.059 1 0.020 3 0.000 2 0.137 1 0.004 3 0.048 9 0.001 5 130 1 130 4
      1503.1.23 1 182 2 215 1.874 7 0.020 5 0.000 2 0.136 2 0.002 7 0.048 2 0.000 9 131 1 130 3
      1503.1.24 1 150 1 826 1.588 4 0.020 2 0.000 2 0.136 4 0.002 6 0.047 3 0.000 8 129 2 130 2
      P19.1.1 1 688 1 295 0.767 1 0.021 4 0.000 2 0.148 2 0.002 4 0.050 3 0.000 8 136 1 140 2
      P19.1.3 237 331 1.395 2 0.025 7 0.000 3 0.198 4 0.011 0 0.056 1 0.003 1 163 2 184 10
      P19.1.4 1 512 929 0.614 4 0.021 1 0.000 4 0.149 2 0.002 3 0.051 3 0.000 9 135 3 141 2
      P19.1.5 757 962 1.270 5 0.025 8 0.000 3 0.178 2 0.003 6 0.050 1 0.001 0 164 2 166 3
      P19.1.6 2 016 2 081 1.032 4 0.021 8 0.000 3 0.148 5 0.002 0 0.049 5 0.000 8 139 2 141 2
      P19.1.7 1 169 1 461 1.249 9 0.021 7 0.000 3 0.148 1 0.005 1 0.049 6 0.001 7 138 2 140 5
      P19.1.8 302 149 0.494 7 0.025 6 0.000 5 0.177 5 0.009 3 0.050 3 0.002 6 163 3 166 9
      P19.1.9 773 312 0.403 8 0.021 7 0.000 3 0.147 7 0.003 5 0.049 4 0.001 2 138 2 140 3
      P19.1.10 1 487 1 201 0.807 7 0.021 7 0.000 2 0.148 3 0.002 3 0.049 7 0.000 7 138 1 140 2
      P19.1.11 1 069 1 033 0.966 5 0.021 5 0.000 3 0.151 7 0.007 4 0.051 1 0.002 5 137 2 143 7
      P19.1.12 620 594 0.957 8 0.021 8 0.000 3 0.147 8 0.005 4 0.049 2 0.001 8 139 2 140 5
      P19.1.13 1 134 96 0.084 2 0.021 6 0.000 2 0.147 6 0.002 7 0.049 7 0.000 9 137 2 140 3
      P19.1.14 1 147 268 0.233 5 0.021 7 0.000 2 0.148 2 0.003 3 0.049 6 0.001 1 138 1 140 3
      P19.1.16 941 515 0.547 3 0.020 7 0.000 3 0.148 3 0.003 4 0.052 0 0.001 2 132 2 140 3
      P19.1.17 721 1 111 1.539 6 0.021 1 0.000 2 0.147 6 0.003 7 0.050 7 0.001 3 135 2 140 4
      P19.1.18 1 126 1 160 1.030 3 0.021 6 0.000 3 0.147 9 0.002 6 0.049 8 0.000 9 137 2 140 2
      P19.1.19 1 988 125 0.062 8 0.021 6 0.000 2 0.146 1 0.002 0 0.049 0 0.000 6 138 2 139 2
      P19.1.20 1 153 1 439 1.247 7 0.020 6 0.000 2 0.162 2 0.004 6 0.057 1 0.001 6 131 1 153 4
      P19.1.21 1 996 592 0.296 5 0.025 7 0.000 3 0.178 0 0.002 4 0.050 2 0.000 7 164 2 166 2
      P19.1.22 950 172 0.181 2 0.021 2 0.000 3 0.147 1 0.013 4 0.050 4 0.004 5 135 2 139 13
      P19.1.23 314 157 0.498 5 0.021 7 0.000 3 0.147 4 0.012 4 0.049 4 0.004 1 138 2 140 12
      P19.1.24 3 243 2 414 0.744 3 0.020 6 0.000 2 0.160 7 0.001 5 0.056 5 0.000 5 132 1 151 1
      P19.1.25 1 393 875 0.628 0 0.021 6 0.000 2 0.148 8 0.002 5 0.049 9 0.000 8 138 1 141 2
      P19.1.26 1 748 1 457 0.833 4 0.021 5 0.000 3 0.148 7 0.002 3 0.050 1 0.000 8 137 2 141 2
      P19.1.27 794 1 016 1.280 1 0.025 6 0.000 3 0.177 4 0.005 4 0.050 3 0.001 5 163 2 166 5
      P19.1.28 1 476 433 0.293 5 0.021 6 0.000 3 0.174 0 0.002 7 0.058 5 0.000 9 138 2 163 2
      P19.1.29 728 892 1.225 5 0.021 1 0.000 4 0.174 1 0.003 2 0.059 7 0.001 0 135 2 163 3
      P19.1.30 1 939 305 0.157 4 0.020 8 0.000 2 0.157 3 0.002 0 0.054 8 0.000 7 133 1 148 2
      P19.1.31 533 137 0.257 8 0.025 6 0.000 3 0.199 2 0.005 6 0.056 5 0.001 5 163 2 184 5
      P19.1.32 1 339 524 0.391 3 0.025 5 0.000 3 0.176 8 0.002 0 0.050 2 0.000 7 163 2 165 2
        注:测试单位为天津地质矿产研究所.
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