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    西藏定结高压基性麻粒岩(退变榴辉岩)的变质P-T轨迹及构造意义

    丁自耕 仝来喜 刘小汉 刘兆 周学君

    丁自耕, 仝来喜, 刘小汉, 刘兆, 周学君, 2018. 西藏定结高压基性麻粒岩(退变榴辉岩)的变质P-T轨迹及构造意义. 地球科学, 43(1): 220-235. doi: 10.3799/dqkx.2018.013
    引用本文: 丁自耕, 仝来喜, 刘小汉, 刘兆, 周学君, 2018. 西藏定结高压基性麻粒岩(退变榴辉岩)的变质P-T轨迹及构造意义. 地球科学, 43(1): 220-235. doi: 10.3799/dqkx.2018.013
    Ding Zigeng, Tong Laixi, Liu Xiaohan, Liu Zhao, Zhou Xuejun, 2018. Metamorphic P-T Path of High-Pressure Mafic Granulite (Retrograded Eclogite) from Dinggye of Tibet and Its Tectonic Implication. Earth Science, 43(1): 220-235. doi: 10.3799/dqkx.2018.013
    Citation: Ding Zigeng, Tong Laixi, Liu Xiaohan, Liu Zhao, Zhou Xuejun, 2018. Metamorphic P-T Path of High-Pressure Mafic Granulite (Retrograded Eclogite) from Dinggye of Tibet and Its Tectonic Implication. Earth Science, 43(1): 220-235. doi: 10.3799/dqkx.2018.013

    西藏定结高压基性麻粒岩(退变榴辉岩)的变质P-T轨迹及构造意义

    doi: 10.3799/dqkx.2018.013
    基金项目: 

    国家自然基金项目 41272261

    详细信息
      作者简介:

      丁自耕(1993-), 男, 硕士研究生, 主要从事矿物学、岩石学、矿床学研究

      通讯作者:

      仝来喜

    • 中图分类号: P581

    Metamorphic P-T Path of High-Pressure Mafic Granulite (Retrograded Eclogite) from Dinggye of Tibet and Its Tectonic Implication

    • 摘要: 定结(Dinggye)位于藏南高喜马拉雅结晶岩系的中部,研究该区域麻粒岩的变质P-T轨迹对于理解青藏高原的碰撞和抬升过程至关重要.通过对该地区的高压基性麻粒岩(退变榴辉岩)的岩相学观察,确定了4期矿物组合:(1)峰期榴辉岩相矿物组合(M1)由石榴子石(核部)+绿辉石(假象)+石英+金红石组成;(2)高压麻粒岩相矿物组合(M2)主要由石榴子石(幔部)+单斜辉石+斜长石+钛铁矿+角闪石+黑云母组成;(3)中压麻粒岩相矿物组合(M3)由石榴子石(边缘)+斜方辉石+斜长石+钛铁矿+黑云母组成;(4)角闪岩相矿物组合(M4)主要由角闪石+斜长石组成.在NCFMASHTO体系下,用THERMOCALC软件对该高压基性麻粒岩进行了热力学模拟.结合传统温压计和平均温压计计算结果,求得M2、M3、M4阶段的温压条件分别为786~826 ℃、0.78~0.96 GPa;798~850 ℃、0.71~0.75 GPa;610~666 ℃、0.51~0.60 GPa,这指示了一条以峰期后近等温降压(ITD)为特征的顺时针P-T轨迹.结合已有地质资料,表明定结高压基性麻粒岩(退变榴辉岩)是喜马拉雅碰撞造山的产物,峰期后经历了近等温降压的构造抬升过程.

       

    • 图  1  喜马拉雅造山带(a)、喜马拉雅中部(b)以及定结区域(c)地质简图

      图a据Xu et al.(2013)修改;图b据Grujic et al.(2011)修改,并标示出了前人发现的麻粒岩化榴辉岩的位置和变质年龄(Kellet et al., 2014刘树文等,2005; Corrie et al., 2010; Wang et al., 2017);图c据刘树文等(2005)修改.STDS.藏南拆离断层系;MCT.主中央逆冲断层;MBT.主边界逆冲断层;ADM.Ama Drime地块;XDNFS.申扎-定结正断层体系;ADD.Ama Drime拆离断层;NRD.Nyönno Ri拆离断层

      Fig.  1.  Geological sketch of the Himalayan orogen (a), central Himalaya (b) and Dinggye area (c)

      图  2  定结高压基性麻粒岩的显微照片(a~d,单偏光)以及背散射照片(e~h)

      a.基性麻粒岩中的石榴子石变斑晶、单斜辉石、斜长石、斜方辉石和钛铁矿等,L-13-64;b.石榴子石变斑晶中的金红石包裹体,L-13-60;c.绿辉石分解后形成的单斜辉石与斜长石的交生结构,L-13-60;d.峰期黑云母与角闪石共生,L-13-60;e.单斜辉石与斜长石的交生结构,L-13-60;f.石榴子石变斑晶边部的斜方辉石与斜长石的蠕虫状后成合晶,L-13-60;g.钛铁矿与斜方辉石和斜长石组成的后成合晶,L-13-60;h.斜方辉石与斜长石的蠕虫状后成合晶以及角闪石和斜长石的后成合晶,L-13-60.矿物缩写:g.石榴子石;opx.斜方辉石;cpx.单斜辉石;pl.斜长石;hb.角闪石;bi.黑云母;ilm.钛铁矿;ru.金红石;q.石英

      Fig.  2.  Photomicrographs and back scattered images (BSI) of high-pressure mafic granulites in Dinggye

      图  3  石榴子石变斑晶Grs-Alm+Sps-Pyr图解

      A、B、C分别为科尔曼3类榴辉岩中石榴子石成分区;D为麻粒岩相石榴子石分布区,据Coleman et al.(1965)

      Fig.  3.  Grs-Alm+Sps-Pyr diagram for garnet porphyroblast

      图  4  石榴子石变斑晶成分剖面

      Fig.  4.  Core-rim compositional profile for the garnet porphyroblast

      图  5  基性麻粒岩中角闪石分类图解

      Leake et al.(2004)

      Fig.  5.  Classification diagram of amphiboles in the mafic granulite

      图  6  在NCFMASHTO(+q+H2O)体系下模拟的定结高压基性麻粒岩的视剖面图及石榴子石钙含量等值线(XCa=Ca/(Fe+Mg+Ca))

      Fig.  6.  The P-T pseudosection and XCa (=Ca/(Fe+Mg+Ca) composition isopleth in the NCFMASHTO (+q+H2O) system for the high-pressure mafic granulite from the Dingyye

      图  7  西藏定结高压基性麻粒岩(退变榴辉岩)的P-T轨迹

      AM.角闪岩相;Amp-Ec.角闪-榴辉岩相;EA.绿帘角闪岩相;EC.榴辉岩相;Ep-Ec.绿帘-榴辉岩相;GR.麻粒岩相;GS.绿片岩相.相边界据Zhang et al.(2010)修改

      Fig.  7.  P-T paths of the Dinggye high-pressure mafic granulites (retrograded eclogite)

      表  1  定结高压基性麻粒岩中代表性矿物电子探针数据(%)

      Table  1.   The representative mineral microprobe data (%) of the high-pressure mafic granulite in Dinggye

      榴辉岩相矿物组合(M1)
      矿物 g(c) g(c) g(c) bi1 bi1 bi1 bi1 bi1 hb1 hb1 hb1 hb1 hb1 hb1
      SiO2 39.13 38.80 38.24 37.65 38.07 37.25 37.76 37.84 42.03 42.85 43.87 43.75 44.56 42.10
      TiO2 0.05 0.06 0.02 4.79 4.81 4.70 4.86 4.07 0.69 1.61 1.13 0.92 0.68 0.72
      Al2O3 21.97 21.88 21.89 14.68 14.47 14.51 14.78 14.64 13.07 12.65 12.23 13.16 11.51 13.67
      Cr2O3 0.01 0.01 0.04 0.05 0.10 0.08 0.04 0.04 0.00 0.02 0.03 0.01 0.01 0.03
      Fe2O3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
      FeO 23.04 24.40 24.18 18.82 18.62 18.14 20.61 19.23 16.44 17.56 17.59 17.23 16.56 17.89
      MnO 0.57 1.03 0.61 0.04 0.05 0.05 0.08 0.02 0.06 0.14 0.12 0.13 0.08 0.09
      MgO 4.83 3.81 3.87 11.24 11.44 11.00 10.41 12.29 10.97 9.17 9.96 9.77 10.87 9.78
      CaO 10.75 10.44 11.38 0.00 0.00 0.00 0.02 0.00 11.33 11.16 11.17 11.17 11.89 11.69
      Na2O 0.02 0.04 0.03 0.12 0.15 0.24 0.20 0.18 1.13 1.35 1.26 1.21 1.02 1.44
      K2O 0.00 0.00 0.00 9.29 9.14 8.78 8.85 9.50 0.92 1.33 1.17 1.22 0.75 1.20
      Cl 0.01 0.00 0.01 0.15 0.16 0.16 0.16 0.10 0.12 0.16 0.14 0.14 0.08 0.20
      F 0.00 0.00 0.00 0.19 0.21 0.23 0.10 0.00 0.05 0.07 0.09 0.09 0.10 0.10
      Total 100.38 100.47 100.27 97.02 97.22 95.14 97.87 97.91 96.81 98.07 98.76 98.80 98.11 98.92
      Si 3.020 3.012 2.974 2.815 2.835 2.830 2.813 2.805 6.245 6.412 6.487 6.449 6.575 6.247
      Ti 0.000 0.004 0.001 0.269 0.269 0.269 0.272 0.227 0.078 0.181 0.125 0.102 0.076 0.081
      Al 1.997 2.002 2.007 1.294 1.270 1.300 1.298 1.280 2.289 2.232 2.132 2.287 2.003 2.392
      Cr 0.001 0.001 0.002 0.003 0.006 0.005 0.002 0.002 0.000 0.003 0.003 0.002 0.001 0.004
      Fe3+ 0.000 0.000 0.043 0.000 0.000 0.000 0.000 0.000 0.773 0.224 0.332 0.320 0.389 0.458
      Fe2+ 1.485 1.584 1.530 1.177 1.160 1.153 1.284 1.192 1.270 1.949 1.807 1.769 1.611 1.711
      Mn 0.037 0.068 0.041 0.003 0.003 0.003 0.005 0.001 0.007 0.018 0.015 0.017 0.010 0.011
      Mg 0.555 0.440 0.449 1.253 1.270 1.246 1.155 1.358 2.429 2.045 2.194 2.146 2.391 2.162
      Ca 0.888 0.868 0.948 0.000 0.000 0.000 0.001 0.000 1.804 1.790 1.769 1.764 1.880 1.859
      Na 0.003 0.007 0.004 0.018 0.021 0.035 0.029 0.026 0.327 0.392 0.360 0.347 0.293 0.415
      K 0.003 0.000 0.000 0.886 0.868 0.851 0.841 0.898 0.174 0.255 0.220 0.229 0.141 0.227
      Total 7.989 7.986 7.999 7.718 7.702 7.692 7.700 7.789 15.396 15.501 15.444 15.432 15.370 15.567
      高压麻粒岩相矿物组合(M2)
      矿物 g(m) g(m) g(m) cpx2 cpx2 cpx2 cpx2 cpx2 pl2 pl2 pl2 pl2 pl2 bi2 bi2 bi2
      SiO2 38.69 38.61 38.41 51.44 51.79 51.45 52.01 51.53 51.96 52.37 50.11 52.38 50.43 36.19 37.53 37.92
      TiO2 0.10 0.07 0.15 0.06 0.01 0.05 0.08 0.02 0.01 0.02 0.02 0.07 0.06 4.75 5.07 4.88
      Al2O3 21.80 21.73 21.61 0.81 0.39 0.90 1.34 1.60 29.23 29.75 23.94 31.60 31.94 14.86 14.18 14.25
      Cr2O3 0.00 0.05 0.00 0.04 0.04 0.02 0.00 0.04 0.00 0.02 0.00 0.00 0.00 0.06 0.03 0.09
      Fe2O3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
      FeO 24.05 24.12 23.28 11.83 11.60 11.06 8.61 10.68 0.53 0.29 2.44 0.29 0.27 19.93 18.80 19.29
      MnO 0.86 0.98 0.64 0.27 0.18 0.16 0.11 0.23 0.00 0.00 0.06 0.00 0.00 0.05 0.09 0.09
      MgO 3.78 3.77 4.04 12.28 12.21 12.74 13.67 12.39 0.42 0.00 2.81 0.00 0.00 11.26 11.01 11.08
      CaO 10.52 10.35 11.76 22.77 22.92 22.88 23.32 23.30 13.38 12.89 17.24 12.88 13.67 0.23 0.02 0.04
      Na2O 0.01 0.11 0.03 0.14 0.19 0.17 0.38 0.14 4.36 4.50 2.55 4.36 3.54 0.10 0.10 0.13
      K2O 0.02 0.01 0.00 0.00 0.02 0.00 0.00 0.00 0.06 0.10 0.03 0.04 0.02 9.52 9.22 9.34
      Cl 0.01 0.04 0.01 0.00 0.00 0.00 0.01 0.00 0.01 0.02 0.01 0.01 0.00 0.13 0.15 0.15
      F 0.03 0.06 0.05 0.00 0.00 0.00 0.03 0.00 0.09 0.03 0.00 0.00 0.00 0.05 0.15 0.19
      Total 99.87 99.90 99.98 99.64 99.35 99.43 99.56 99.93 100.05 99.99 99.21 101.63 99.93 97.13 96.35 97.45
      Si 3.018 3.016 2.993 1.949 1.968 1.945 1.944 1.939 2.369 2.380 2.346 2.339 2.294 2.731 2.827 2.831
      Ti 0.006 0.004 0.009 0.002 0.000 0.001 0.002 0.000 0.000 0.001 0.001 0.002 0.002 0.270 0.287 0.274
      Al 2.005 2.001 1.985 0.036 0.017 0.040 0.059 0.071 1.571 1.594 1.322 1.664 1.713 1.322 1.260 1.255
      Cr 0.000 0.003 0.000 0.001 0.001 0.001 0.000 0.001 0.000 0.001 0.000 0.000 0.000 0.004 0.002 0.006
      Fe3+ 0.000 0.000 0.016 0.071 0.060 0.079 0.077 0.058 0.020 0.011 0.096 0.011 0.010 0.000 0.000 0.000
      Fe2+ 1.569 1.575 1.500 0.304 0.308 0.271 0.192 0.278 0.000 0.000 0.000 0.000 0.000 1.258 1.185 1.204
      Mn 0.057 0.065 0.042 0.009 0.006 0.005 0.004 0.007 0.000 0.000 0.002 0.000 0.000 0.003 0.006 0.006
      Mg 0.439 0.439 0.470 0.694 0.691 0.718 0.761 0.695 0.029 0.000 0.196 0.000 0.000 1.266 1.236 1.233
      Ca 0.879 0.866 0.982 0.925 0.933 0.927 0.934 0.940 0.653 0.628 0.865 0.616 0.666 0.019 0.002 0.003
      Na 0.002 0.016 0.004 0.010 0.014 0.013 0.028 0.010 0.385 0.396 0.232 0.378 0.312 0.015 0.015 0.019
      K 0.002 0.001 0.000 0.000 0.001 0.000 0.000 0.000 0.004 0.006 0.002 0.002 0.001 0.917 0.886 0.890
      Total 7.977 7.986 8.001 4.001 3.999 4.000 4.001 3.999 5.031 5.017 5.062 5.012 4.998 7.805 7.706 7.721
      麻粒岩相矿物组合(M3) 角闪岩相矿物组合(M4)
      矿物 g(r) g(r) g(r) bi3 bi3 opx3 opx3 opx3 opx3 pl3 pl3 pl3 pl3 hb4 hb4 pl4 pl4
      SiO2 37.88 39.06 38.45 34.81 36.32 50.54 50.75 49.97 49.88 45.08 45.24 45.65 45.29 45.64 45.61 50.43 56.39
      TiO2 0.07 0.08 0.01 3.75 5.08 0.03 0.00 0.00 0.00 0.00 0.01 0.00 0.00 1.11 1.16 0.06 0.00
      Al2O3 21.69 22.07 21.83 14.97 15.11 0.30 0.36 2.84 3.07 34.35 34.80 33.50 34.64 8.26 9.22 31.94 26.87
      Cr2O3 0.00 0.00 0.03 0.09 0.14 0.00 0.04 0.03 0.05 0.03 0.01 0.00 0.00 0.05 0.03 0.00 0.00
      Fe2O3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
      FeO 25.95 24.30 24.56 22.67 20.69 31.46 31.25 29.51 29.46 0.38 0.43 0.79 0.37 17.27 17.63 0.33 0.37
      MnO 0.94 0.74 0.49 0.04 0.03 0.39 0.37 0.32 0.48 0.00 0.06 0.04 0.02 0.06 0.07 0.00 0.03
      MgO 4.08 3.96 3.89 11.20 10.22 16.11 16.54 15.11 14.73 0.01 0.01 0.43 0.01 11.22 10.70 0.00 0.04
      CaO 8.96 10.41 11.07 0.10 0.09 0.45 0.49 1.43 1.36 18.00 18.67 17.88 18.07 11.78 12.20 13.67 9.33
      Na2O 0.02 0.01 0.05 0.23 0.29 0.16 0.00 0.07 0.14 1.18 0.91 1.05 1.06 0.73 0.91 3.54 6.32
      K2O 0.00 0.00 0.00 8.26 9.01 0.00 0.01 0.03 0.02 0.01 0.01 0.01 0.03 0.58 0.58 0.02 0.06
      Cl 0.00 0.00 0.00 0.11 0.12 0.03 0.01 0.00 0.01 0.00 0.02 0.00 0.00 0.07 0.08 0.00 0.00
      F 0.00 0.00 0.00 0.06 0.01 0.00 0.00 0.00 0.02 0.00 0.21 0.07 0.00 0.01 0.00 0.00 0.00
      Total 99.59 100.63 100.38 96.29 97.11 99.48 99.82 99.31 99.22 99.04 100.38 99.42 99.49 96.78 98.19 99.99 99.41
      Si 2.979 3.018 2.989 2.649 2.739 1.975 1.974 1.946 1.945 2.098 2.086 2.118 2.097 6.812 6.744 2.294 2.548
      Ti 0.004 0.005 0.001 0.215 0.288 0.001 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.124 0.129 0.002 0.000
      Al 2.011 2.010 2.000 1.343 1.344 0.014 0.017 0.130 0.141 1.885 1.891 1.833 1.891 1.453 1.607 1.713 1.432
      Cr 0.000 0.000 0.002 0.006 0.008 0.000 0.001 0.001 0.002 0.001 0.000 0.000 0.000 0.006 0.003 0.000 0.000
      Fe3+ 0.027 0.000 0.026 0.216 0.000 0.047 0.035 0.000 0.000 0.015 0.017 0.030 0.014 0.470 0.345 0.011 0.014
      Fe2+ 1.681 1.570 1.571 1.226 1.305 0.981 0.981 0.961 0.961 0.000 0.000 0.000 0.000 1.685 1.836 0.000 0.000
      Mn 0.063 0.048 0.032 0.003 0.002 0.013 0.012 0.011 0.016 0.000 0.002 0.002 0.001 0.008 0.009 0.000 0.001
      Mg 0.478 0.456 0.450 1.271 1.149 0.938 0.959 0.877 0.856 0.001 0.001 0.030 0.001 2.496 2.359 0.000 0.003
      Ca 0.755 0.862 0.922 0.009 0.007 0.019 0.020 0.060 0.057 0.898 0.922 0.889 0.897 1.884 1.933 0.666 0.452
      Na 0.003 0.002 0.007 0.034 0.043 0.012 0.000 0.005 0.011 0.106 0.081 0.095 0.095 0.212 0.261 0.312 0.554
      K 0.003 0.003 0.000 0.801 0.867 0.000 0.001 0.001 0.001 0.000 0.000 0.001 0.002 0.110 0.110 0.001 0.004
      Total 8.004 7.974 8.000 7.773 7.752 4.000 4.000 3.992 3.990 5.004 5.000 4.998 4.998 15.260 15.336 4.999 5.008
      注:矿物的离子数是利用AX 程序计算的(Holland and Powell, 1998; 2003年升级).g(c).石榴子石核部;g(m).石榴子石幔部;g(r).石榴子石边部.
      下载: 导出CSV

      表  2  利用传统矿物温压计计算的各阶段变质P-T条件

      Table  2.   The calculated P-T results of different metamorphic stages by conventional mineral thermobarometry

      变质阶段 温度计 T(℃) 压力计 P(GPa)
      M2 T(00R) 650~730 P(91E) 0.78~0.96
      M3 T(93L) 798~850 P(93L) 0.71~0.75
      M4 T(94H) 610~666 P(07B)
      P(95A)
      0.51~0.60
      注:T(00R).g-cpx温度计,Ravna(2000);T(93L).g-opx温度计,Lal(1993);T(94H).hb-pl温度计,Holland and Blundy(1994);P(91E).g-cpx-pl-q压力计,Eckert et al.(1991);P(93L).g-opx-pl-q压力计,Lal(1993);P(07B).hb-pl-q压力计,Bhadra and Bhattachary(2007);P(95A).Al-in hb压力计,Anderson and Smith(1995).
      下载: 导出CSV

      表  3  全岩地球化学数据

      Table  3.   Whole-rock compositions (%) of the mafic granulite

      Na2O MgO P2O5 Al2O3 SiO2 K2O CaO TiO2 MnO TFe2O3 Total
      L-13-60 0.71 7.21 0.22 14.48 46.73 1.36 10.20 1.95 0.25 16.61 99.54
      L-13-61 0.78 7.04 0.24 14.33 46.70 1.31 10.13 2.02 0.25 16.68 99.35
      L-13-64 0.70 7.13 0.22 14.07 46.64 1.38 10.53 1.96 0.28 17.35 99.99
      注:数据为摩尔百分含量.
      下载: 导出CSV
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    • 收稿日期:  2017-08-01
    • 刊出日期:  2018-01-15

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