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    桂北地区三门韧性剪切带的厘定及其构造意义

    秦亚 冯佐海 黄靖哲 白玉明 吴杰 张桂林 万磊

    秦亚, 冯佐海, 黄靖哲, 白玉明, 吴杰, 张桂林, 万磊, 2021. 桂北地区三门韧性剪切带的厘定及其构造意义. 地球科学, 46(11): 4017-4032. doi: 10.3799/dqkx.2020.353
    引用本文: 秦亚, 冯佐海, 黄靖哲, 白玉明, 吴杰, 张桂林, 万磊, 2021. 桂北地区三门韧性剪切带的厘定及其构造意义. 地球科学, 46(11): 4017-4032. doi: 10.3799/dqkx.2020.353
    Qin Ya, Feng Zuohai, Huang Jingzhe, Bai Yuming, Wu Jie, Zhang Guilin, Wan Lei, 2021. Discovery of Sanmen Ductile Shear Zone in North Guangxi and Its Tectonic Significances. Earth Science, 46(11): 4017-4032. doi: 10.3799/dqkx.2020.353
    Citation: Qin Ya, Feng Zuohai, Huang Jingzhe, Bai Yuming, Wu Jie, Zhang Guilin, Wan Lei, 2021. Discovery of Sanmen Ductile Shear Zone in North Guangxi and Its Tectonic Significances. Earth Science, 46(11): 4017-4032. doi: 10.3799/dqkx.2020.353

    桂北地区三门韧性剪切带的厘定及其构造意义

    doi: 10.3799/dqkx.2020.353
    基金项目: 

    国家自然科学基金项目 42072259

    国家自然科学基金项目 42162018

    广西自然科学基金项目 2017GXNSFBA198166

    广西自然科学基金项目 2018GXNSFAA281248

    广西自然科学基金项目 2019GXNSFDA245009

    详细信息
      作者简介:

      秦亚(1986-), 男, 副教授, 博士, 从事区域构造演化、花岗岩与构造环境的研究及相关教学工作.ORCID: 0000-0002-8281-8732.E-mail: qinya2013017@glut.edu.cn

    • 中图分类号: P542

    Discovery of Sanmen Ductile Shear Zone in North Guangxi and Its Tectonic Significances

    • 摘要: 通过野外地质调查、室内显微组构分析和磁组构测量,在桂北三门地区厘定出一条大型韧性剪切带;并利用热液锆石U-Pb定年约束其变形时代.三门韧性剪切带发育密集的透入性片理、旋转碎斑系、拉伸线理、眼球构造、书斜构造、A型褶皱、波状消光、机械双晶、核幔构造和S-C组构等宏观和微观韧性变形特征.磁各向异性度(P值)显示其走向呈NNE向,倾向呈NWW向.运动学指向显示早期具有左旋逆冲剪切,晚期具有右旋正滑剪切的运动学性质.磁化率椭球体扁率(E值)显示岩石变形以压扁型应变为主,暗示运动学方向以左旋逆冲剪切为主.镁铁质糜棱岩的热液锆石U-Pb定年结果为441±2 Ma,代表三门韧性剪切带的变形时代.在磁组构、运动学和年代学研究的基础上,结合区域地质资料,认为该韧性剪切带是华南加里东期华夏陆块由SE向NW逆冲到扬子陆块受阻后反冲作用的产物.这一认识揭示了扬子陆块和华夏陆块碰撞拼合的方式和时代,为深化华南加里东构造运动的认识提供了新的资料.

       

    • 图  1  桂北地区地质简图

      ①摩天岭断裂;②四堡断裂;③元宝山断裂;④三江断裂;⑤三门断裂;⑥龙胜断裂

      Fig.  1.  Sketch map of North Guangxi

      图  2  三门韧性剪切带野外宏观特征及运动学判别标志

      a.丹洲群板岩强烈片理化并产生Z型褶曲,指示逆冲剪切性质(剖面,龙胜瓢里);b.丹洲群片理化岩石中石英脉体的香肠构造,指示逆冲剪切(剖面,龙胜三门);c.变辉绿岩中透入性片理(剖面,龙胜吊竹山);d.拉伸线理及阶步,显示走滑的特征(剖面,龙胜三门);e.硅化大理岩旋转椭球体,指示逆冲剪切(剖面,龙胜三门);f.大理岩化灰岩中S-C组构,指示逆冲剪切(剖面,龙胜三门);g.变镁铁质糜棱岩中的眼球状构造,指示左旋剪切(平面,龙胜上朗);h.硅化大理岩书斜构造,指示右旋剪切;同时其中的“σ”残斑,指示左旋剪切(平面,龙胜上朗);i.硅化大理岩旋转碎斑,指示正滑剪切(剖面,龙胜上朗).

      Fig.  2.  Field macro-characteristics and kinematics discrimination marks of Sanmen ductile shear zone

      图  3  三门韧性剪切带显微构造变形特征

      a.镁铁质糜棱岩中钠长石残斑脆性破碎现象(龙胜三门)(+);b.镁铁质糜棱岩S-C组构指示逆冲剪切(龙胜三门)(+);c.镁铁质糜棱岩中钠长石碎斑应力砂钟现象(龙胜三门)(+);d.石英的塑性拉长及波状消光和变形带(龙胜三门)(+);e.方解石的机械双晶(龙胜上朗)(+);f.方解石的机械双晶及石英的核幔构造(龙胜三门)(+);g.方解石残斑与定向排列的基质构成显微S-C组构,指示正滑剪切(龙胜瓢里)(+);h.方解石集合体长轴优选方位与定向排列的基质组成S-C组构,指示左旋剪切(龙胜三门)(+);i.镁铁质糜棱岩中长石碎斑与塑性变形的绿泥石构成S-C组构,指示逆冲剪切(龙胜吊竹山)(+).Q.石英;Cal.方解石;Pl.斜长石;Chl.绿泥石;Sc.糜棱面理;Ss.剪切面理.其中a,b,c引自张桂林(2004)

      Fig.  3.  Microstructure deformation characteristics of Sanmen ductile shear zone

      图  4  三门韧性剪切带分布图及剖面图

      1.泥盆系;2.寒武系;3.震旦系;4.南华系;5.丹洲群拱洞组;6.丹洲群合桐组;7.镁铁质-超镁铁质岩;8.弱韧性变形带;9.强韧性变形带;10.粉砂岩;11.砂岩;12.灰岩;13.大理岩;14.浅变质砂岩;15.千枚岩;16.板岩;17.镁铁质-超镁铁质岩石;18.断层;19.角度不整合界线;20.地质界线;21.韧性剪切变形带;22.剖面线方位;23.磁组构P值;24.1.10的P值界线;25.1.05的P值界线;26.年龄样品采样位置;27.磁组构样品采样位置及编号;28.剖面位置;29.标注线;30.地名

      Fig.  4.  Distribution and geological section of the Sanmen ductile shear zone

      图  5  三门韧性剪切带面理倾向赤平投影图

      a.野外实测糜棱C面理产状;b.磁面理产状

      Fig.  5.  Foliation tendency stereographic projection of the Sanmen ductile shear zone

      图  6  三门韧性剪切带F-L图解

      Fig.  6.  F-L diagram of the Sanmen ductile shear zone

      图  7  锆石阴极发光图像

      Qin et al.(2018)

      Fig.  7.  CL image of zircon

      图  8  锆石U-Pb年龄谐和图解(a)、球粒陨石标准化稀土元素配分图(b)及锆石成因判别图解(c, d)

      a.据Qin et al.(2018);c,d.据Hoskin(2005)

      Fig.  8.  Zircon U-Pb age concordance diagram (a), chondrite-normalized REE partition diagram (b) and zircon genetic discrimination diagrams (c, d)

      表  1  桂北三门地区岩石磁组构参数及参数计算结果

      Table  1.   Measurements and calculation of the rock magnetic fabric elements along Sanmen area of North Guangxi

      剖面 样品号 Kmax Kint Kmin Kmax Kint Kmin L F P E
      Dg Ig Dg Ig Dg Ig
      A-A 17089 1.022 0.998 0.980 11.9 7.9 102.3 3.0 213.1 81.5 1.024 1.018 1.043 0.994
      17090 1.042 0.994 0.964 268.7 75.0 6.3 2.0 96.8 14.9 1.048 1.031 1.081 0.984
      17091 1.071 0.979 0.950 177.3 36.5 50.5 39.0 292.6 30.0 1.094 1.031 1.127 0.942
      17092 1.033 1.007 0.960 4.6 4.2 264.6 67.3 96.3 22.3 1.026 1.049 1.076 1.022
      17093 1.022 0.992 0.986 236.6 50.4 68.9 38.9 334.0 6.1 1.030 1.006 1.037 0.977
      B-B 17082 1.047 1.003 0.950 238.8 68.6 23.0 17.7 116.8 11.8 1.044 1.056 1.102 1.011
      17083 1.045 1.015 0.940 279.4 65.3 30.3 9.3 124.2 22.7 1.030 1.080 1.112 1.049
      17084 1.017 1.007 0.975 53.6 64.2 175.8 14.5 271.5 20.9 1.010 1.033 1.043 1.023
      17085 1.071 0.977 0.952 203.9 17.1 93.2 48.8 306.9 36.0 1.096 1.026 1.125 0.936
      17086 1.350 1.018 0.633 226.6 45.3 356.1 32.2 105.2 27.4 1.326 1.608 2.133 1.213
      17087 1.047 0.999 0.955 338.5 46.5 221.8 23.1 114.8 34.5 1.048 1.046 1.096 0.998
      C-C 17070 1.075 1.001 0.923 108.1 76.9 244.4 9.5 335.9 8.9 1.074 1.085 1.165 1.010
      17069 1.048 1.014 0.938 314.6 59.5 211.9 7.4 117.7 29.4 1.034 1.081 1.117 1.045
      17068 1.042 1.023 0.935 262.9 57.3 13.3 12.6 110.6 29.6 1.019 1.094 1.114 1.074
      17066 1.029 1.023 0.949 210.6 46.6 347.1 34.5 94.0 22.9 1.006 1.078 1.084 1.072
      17065 1.053 1.010 0.938 219.9 50.8 11.2 35.6 111.7 14.3 1.043 1.077 1.123 1.033
      17063 1.037 1.005 0.958 223.5 82.5 49.8 7.5 319.7 0.8 1.032 1.049 1.082 1.016
      18016-5 1.038 1.019 0.943 209.5 60.4 33.5 29.5 302.5 1.7 1.019 1.081 1.101 1.061
      18016-4 1.033 1.007 0.960 129.9 75.6 30.9 2.3 300.4 14.2 1.026 1.049 1.076 1.022
      18016-2 1.068 1.009 0.923 194.4 60.3 12.3 29.6 102.8 0.9 1.058 1.093 1.157 1.033
      18016-3 1.103 1.007 0.890 194.0 55.2 28.1 34.0 293.6 6.6 1.095 1.131 1.239 1.033
      18016-1 1.277 0.986 0.736 201.3 28.7 304.1 22.0 65.8 52.5 1.295 1.340 1.735 1.035
      D-D 17072 1.347 1.086 0.567 286.0 58.3 188.4 4.7 95.6 31.3 1.240 1.915 2.376 1.544
      17081 1.046 1.026 0.927 213.7 78.8 11.3 10.3 102.0 4.2 1.019 1.107 1.128 1.086
      17080 1.035 1.010 0.955 203.2 68.2 2.4 20.5 95.0 7.1 1.025 1.058 1.084 1.032
      17079 1.091 0.991 0.918 185.1 34.9 313.3 41.6 72.6 28.8 1.101 1.080 1.188 0.981
      17078 1.042 1.002 0.956 217.8 52.8 21.2 36.1 117.1 8.0 1.040 1.048 1.090 1.008
      17077 1.039 0.996 0.965 219.9 28.9 328.5 29.9 95.1 46.0 1.043 1.032 1.077 0.989
      17076 1.022 1.004 0.974 78.5 16.1 347.2 4.6 241.7 73.2 1.018 1.031 1.049 1.013
      17074 1.021 1.007 0.973 11.6 33.6 204.7 55.7 105.7 6.1 1.014 1.035 1.049 1.021
      E-E 18014-10 1.011 0.999 0.989 197.1 62.4 0.5 26.6 93.9 6.8 1.012 1.010 1.022 0.998
      18014-8 1.014 0.996 0.990 287.7 35.5 38.3 26.2 155.8 43.1 1.018 1.006 1.024 0.988
      18014-7 1.025 0.996 0.978 270.5 65.1 60.2 21.8 154.8 11.4 1.029 1.018 1.048 0.989
      18014-9 1.093 0.994 0.913 39.8 67.8 277.7 12.2 183.7 18.2 1.100 1.089 1.197 0.990
      18014-6 1.044 1.007 0.949 327.7 50.6 92.3 25.0 196.8 28.3 1.037 1.061 1.100 1.023
      18014-1 1.029 1.000 0.971 227.8 53.2 77.9 32.9 338.2 14.6 1.029 1.030 1.060 1.001
      18014-5 1.025 0.993 0.982 7.3 65.1 273.4 1.8 182.6 24.8 1.032 1.011 1.044 0.980
      18014-4 1.015 1.000 0.985 37.2 75.0 162.2 8.7 254.1 12.1 1.015 1.015 1.030 1.000
      18014-3 1.016 1.004 0.980 355.0 57.4 86.5 0.9 177.1 32.6 1.012 1.024 1.037 1.012
      18014-2 1.025 0.996 0.978 214.4 63.9 35.8 26.1 305.5 0.5 1.029 1.018 1.048 0.989
      F-F 16139 1.039 1.002 0.959 324.6 42.2 204.1 29.2 92.1 33.8 1.037 1.045 1.083 1.008
      16140 1.052 1.003 0.944 309.9 44.5 197.3 21.3 89.6 37.8 1.049 1.063 1.114 1.013
      16141 1.129 0.957 0.914 124.1 31.3 350.8 48.5 230.1 24.3 1.180 1.047 1.235 0.887
      16146 1.072 1.020 0.908 334.8 47.2 176.6 40.7 76.9 11.0 1.051 1.123 1.181 1.069
      16142 1.045 1.001 0.954 334.8 47.1 183.1 39.2 81.0 14.5 1.044 1.049 1.095 1.005
      16143 1.027 1.010 0.963 286.5 58.3 175.7 12.4 78.8 28.7 1.017 1.049 1.066 1.031
      16144 1.019 1.005 0.976 290.3 58.8 157.0 22.5 58.1 20.4 1.014 1.030 1.044 1.016
      16145 1.035 1.022 0.943 324.9 43.5 201.8 30.0 90.9 31.8 1.013 1.084 1.098 1.070
      18015-1 1.030 1.000 0.970 190.2 3.0 282.1 32.4 95.4 57.4 1.030 1.031 1.062 1.001
      18015-2 1.038 1.004 0.959 187.7 12.3 307.3 66.2 93.1 20.0 1.034 1.047 1.082 1.013
      18015-3 1.036 1.002 0.962 213.3 23.2 320.6 34.7 96.8 46.1 1.034 1.042 1.077 1.008
      18015-4 1.026 0.996 0.978 208.2 35.7 342.0 44.0 98.7 24.9 1.030 1.018 1.049 0.988
      注:KmaxKintKmin分别是磁化率椭球体中最大、中间和最小主轴的磁化率大小,单位为10-4SI;P(磁化率各向异性度)=Kmax/KminF(磁面理)=Kint/KminL(磁线理)=Kmax/KintE(磁化率椭球体扁率)=F/LDg为磁偏角(°);Ig为磁倾角(°).
      下载: 导出CSV

      表  2  三门韧性剪切带面理产状

      Table  2.   Foliation occurrence of Sanmen ductile shear zone

      野外实测糜棱C面理产状 磁面理产状
      序号 倾向(°) 倾角(°) 序号 倾向(°) 倾角(°) 序号 倾向(°) 倾角(°)
      1 127 74 1 274 83 27 277 44
      2 274 60 2 336 47 28 279 65
      3 285 58 3 335 79 29 140 89
      4 313 44 4 4 71 30 274 67
      5 256 55 5 17 62 31 291 60
      6 297 85 6 158 75 32 298 61
      7 255 61 7 3 65 33 156 81
      8 292 50 8 74 78 34 276 59
      9 340 49 9 357 57 35 286 84
      10 264 59 10 126 89 36 62 17
      11 278 33 11 123 88 37 275 44
      12 274 61 12 120 76 38 297 82
      13 267 39 13 283 89 39 253 61
      14 267 77 14 114 83 40 275 83
      15 270 30 15 246 38 41 282 86
      16 274 61 16 292 76 42 297 78
      17 276 30 17 272 56 43 304 67
      18 265 54 18 270 52 44 91 69
      19 285 58 19 50 66 45 127 54
      20 313 44 20 257 79 46 285 63
      21 292 50 21 261 76 47 295 56
      22 264 59 22 259 61 48 33 8
      23 278 33 23 238 70 49 277 75
      24 276 47 24 271 58 50 113 60
      25 260 23 25 275 33 51 276 68
      26 273 70 52 154 84
      下载: 导出CSV

      表  3  镁铁质糜棱岩锆石微量元素含量

      Table  3.   Trace element contents of zircon in mafic mylonite

      点号 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu ΣREE LREE δEu δCe SmN/LaN
      1 21.31 49.33 7.30 71.33 43.01 12.47 93.20 35.29 516.43 197.19 650.78 165.81 1 290.68 236.28 3 390.41 204.75 0.59 0.97 3.13
      2 11.83 38.70 6.24 61.61 51.30 18.88 289.65 165.90 1 800.90 646.75 2 586.18 506.12 4 291.60 635.84 11 111.50 188.56 0.37 1.09 6.72
      3 106.27 284.25 42.58 173.83 90.68 27.37 258.40 126.40 1 111.68 381.59 2 090.89 473.13 5 803.91 901.92 11 872.90 724.98 0.51 1.04 1.32
      4 32.89 107.76 13.62 105.07 62.77 32.34 393.11 237.13 2 058.42 863.25 3 094.88 607.18 4 243.15 713.70 12 565.27 354.45 0.48 1.25 2.96
      5 28.40 94.18 10.84 103.61 65.95 31.92 463.75 337.84 3 063.22 1 094.74 4 660.95 735.83 5 390.51 860.73 16 942.47 334.90 0.41 1.32 3.60
      6 12.81 51.49 8.47 67.31 59.27 16.28 152.96 49.14 577.99 237.57 1 589.61 380.05 4 085.38 750.00 8 038.33 215.63 0.50 1.17 7.17
      7 21.75 55.69 9.69 81.56 40.73 14.71 134.92 42.99 493.79 219.10 1 595.55 393.79 4 071.47 706.63 7 882.37 224.13 0.55 0.94 2.90
      8 25.71 58.34 9.45 68.00 43.40 14.20 123.37 37.82 369.06 126.54 954.51 245.62 3 435.17 507.69 6 018.88 219.10 0.55 0.92 2.61
      9 21.44 47.73 7.47 74.90 35.80 12.96 141.09 45.03 504.27 199.03 1 436.06 348.55 3 774.66 674.07 7 323.06 200.30 0.49 0.92 2.59
      10 17.48 52.26 8.63 67.16 32.05 19.97 234.52 73.54 515.00 158.89 967.76 217.82 2 310.45 423.95 5 099.48 197.55 0.51 1.04 2.84
      11 33.38 80.24 13.12 40.44 37.79 23.11 311.64 89.31 951.84 308.48 1 482.27 298.30 2 811.07 448.54 6 929.53 228.08 0.45 0.94 1.75
      12 20.35 41.55 6.19 71.16 43.26 15.70 183.90 42.48 433.97 161.83 535.53 133.54 1 481.69 311.61 3 482.76 198.21 0.46 0.90 3.29
      13 33.34 99.93 17.12 87.03 59.73 44.32 428.92 247.68 2 826.47 945.87 3 796.55 636.25 4 938.85 661.62 14 823.68 341.47 0.62 1.02 2.78
      14 54.20 167.93 22.93 124.66 49.14 33.90 178.02 76.91 608.96 234.27 1 564.52 381.64 4 049.94 732.41 8 279.43 452.76 0.98 1.17 1.40
      15 20.77 49.05 7.35 66.27 42.76 24.74 203.60 67.29 480.11 238.67 1 070.49 269.35 2 901.66 523.61 5 965.72 210.94 0.67 0.97 3.19
      16 27.27 56.87 8.47 82.12 42.02 22.42 206.50 68.52 482.02 230.76 1 034.77 285.59 3 473.41 679.99 6 700.73 239.17 0.60 0.91 2.39
      17 22.45 79.56 9.05 62.81 61.24 27.64 322.85 175.07 1 925.57 637.42 2 596.69 464.07 3 994.08 562.54 10 941.04 262.75 0.48 1.37 4.23
      下载: 导出CSV
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