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    扬子克拉通北缘新元古代A型花岗岩的发现及大地构造意义

    曹正琦 蔡逸涛 曾佐勋 胡正祥 陈静 蒋幸福 孙政权 吴波 刘成新 郭盼

    曹正琦, 蔡逸涛, 曾佐勋, 胡正祥, 陈静, 蒋幸福, 孙政权, 吴波, 刘成新, 郭盼, 2017. 扬子克拉通北缘新元古代A型花岗岩的发现及大地构造意义. 地球科学, 42(6): 957-943. doi: 10.3799/dqkx.2017.80
    引用本文: 曹正琦, 蔡逸涛, 曾佐勋, 胡正祥, 陈静, 蒋幸福, 孙政权, 吴波, 刘成新, 郭盼, 2017. 扬子克拉通北缘新元古代A型花岗岩的发现及大地构造意义. 地球科学, 42(6): 957-943. doi: 10.3799/dqkx.2017.80
    Cao Zhengqi, Cai Yitao, Zeng Zuoxun, Hu Zhengxiang, Chen Jing, Jiang Xingfu, Sun Zhengquan, Wu Bo, Liu Chengxin, Guo Pan, 2017. Discovery of Neoproterozoic A-Type Granite in Northern Yangtze Craton and Its Tectonic Significance. Earth Science, 42(6): 957-943. doi: 10.3799/dqkx.2017.80
    Citation: Cao Zhengqi, Cai Yitao, Zeng Zuoxun, Hu Zhengxiang, Chen Jing, Jiang Xingfu, Sun Zhengquan, Wu Bo, Liu Chengxin, Guo Pan, 2017. Discovery of Neoproterozoic A-Type Granite in Northern Yangtze Craton and Its Tectonic Significance. Earth Science, 42(6): 957-943. doi: 10.3799/dqkx.2017.80

    扬子克拉通北缘新元古代A型花岗岩的发现及大地构造意义

    doi: 10.3799/dqkx.2017.80
    基金项目: 

    国家自然科学青年基金项目 41402075

    国家自然科学基金重点项目 41230206-1

    中国地质调查局项目“大悟等4幅1:5万区域地质矿产调查” 12120114048301

    详细信息
      作者简介:

      曹正琦(1980-),男,工程师,博士,主要从事区域构造方面研究.ORCID:0000-0003-0809-1034.E-mail: 27549167@qq.com

      通讯作者:

      蔡逸涛,E-mail: cytnj@foxmail.com

    • 中图分类号: P548

    Discovery of Neoproterozoic A-Type Granite in Northern Yangtze Craton and Its Tectonic Significance

    • 摘要: 对大磊山片麻状花岗岩的研究可以为新元古代罗迪尼亚超大陆在扬子克拉通北缘裂解提供约束.在详细野外地质调查和岩相学工作基础上,对该片麻状花岗岩进行了系统的锆石U-Pb定年、全岩地球化学和锆石原位Lu-Hf同位素分析,研究发现,这些片麻状花岗岩富硅(SiO2=73.18%~77.40%)、碱(Na2O+K2O=8.07%~8.70%)、贫铝(Al2O3=12.11%~13.92%)和镁(MgO=0.10%~0.34%),富集LILE、Ga、Rb、Th,Zr和Hf元素具明显正异常,Nb、Sr、P、Ti等元素具明显负异常,表现出后造山A型花岗岩(A2型)的特征.这些花岗岩中,锆石均具典型的震荡环带,Th/U比值均大于0.5,为岩浆成因;两个样品的LA-ICP-MS(laser ablation inductively coupled plasma mass spectrometry)锆石的谐和分别是:801.3±3.0 Ma(MSWD=0.62,n=21) 和796.1±6.3 Ma(MSWD=1.70,n=15),其中一个样品继承锆石谐和年龄为845.0±12.0 Ma(MSWD=1.30,n=6),表示他们是新元古代岩浆结晶产物.锆石εHf(t)值变化于-7.5~+8.0,正εHf(t)值对应的亏损地幔单阶段模式年龄(tDM1)为1 242~1 059 Ma,负εHf(t)值对应的地壳两阶段模式年龄(tDM2)为1 636~1 981 Ma,显示该地区存在的最古老物质是古元古代(老至1 981 Ma).这些数据结果表明形成大磊山A型花岗岩的初始物质主要为元古代古老地壳物质,暗示该岩浆源自于壳幔混合作用,幔源端元可能源自于伸展拉张背景下地幔岩浆上涌.结合区域研究成果认为,该A型花岗岩的形成与罗迪尼亚超大陆聚合后-裂解中的陆缘弧后拉张环境所引起的深部古元古代地壳拉张垮塌有关.

       

    • 图  1  扬子克拉通北缘大地构造简图(a)和研究区大地构造格架(b)

      图a中CYB.华夏陆块,YZB.扬子陆块,COO.中央造山带,NCC.华北克拉通;a.据杨巍然等(2000);b.据Yang et al.(2000)Xu et al.(2009)

      Fig.  1.  Simplified tectonic map of the northern Yangtze craton (a) and tectonic framework of the research area (b)

      图  2  研究区地质简图及年代学样品位置(a)和花岗岩地层剖面(b)

      Fig.  2.  Geological map of the research area and geochronological sample location (a) and geological profile of the granite stratigraphy (b)

      图  3  大磊山片麻状花岗岩样品野外特征及镜下照片

      Fig.  3.  Field and microscopic photos of the Daleishan gneissic granite

      图  4  大磊山岩体片麻状花岗岩SiO2-(Na2O+K2O)(a)和SiO2-K2O(b)判别图解

      a.据Le Maitre(1989); b.实线据Peccerillo et al.(1976),虚线据Middlemost(1985); 红色圆圈代表中粗粒片麻状花岗岩,黑色圆圈代表细粒片麻状花岗岩

      Fig.  4.  Discrimination diagrams SiO2-(Na2O+K2O) (a) and SiO2-K2O (b)for Daleishan gneissic granite

      图  5  大磊山岩体片麻状花岗岩稀土元素配分图(a)和微量元素蛛网图(b)球粒陨石和原始地幔标准化值

      Sun and McDonough(1989); 红色填充圆圈为中粗粒片麻状花岗岩,黑色方形为细粒片麻状花岗岩

      Fig.  5.  (a) Chondrite-and (b) primitive mantle-normalized diagrams for gneissic granite of the Daleishan area

      图  6  (a)细粒(D6597) 和(b)中-粗粒(PM301/1) 片麻状花岗岩样品锆石阴极发光、LA-MS-ICP-MS测年及Hf同位素分析点

      实心圆圈为U-Pb分析点,虚线圈为Lu-Hf同位素分析点

      Fig.  6.  Cathodolominescence (CL) images、LA-MS-ICP-MS dating and Hf isotopic analysis of zircons for (a) fine-grain sample D6597 and (b) medium-coarse sample PM301/1 of Daleishan gneissic granite zircon

      图  7  (a)细粒(D6597) 和(b)中-粗粒(PM301/1) 片麻状花岗岩样品LA-ICP-MS锆石U-Pb谐和图

      Fig.  7.  Concordia plots showing the geochronological results of the LA-ICP-MS zircon U-Pb of (a) fine-grain sample D6597 and (b) medium-coarse sample PM301/1 of Daleishan gneissic granite

      图  8  样品D6597锆石εHf(t)值分布

      Fig.  8.  Zircon εHf(t) values for sample D6597

      图  9  样品PM301/1(a)成岩和(b)残留锆石εHf(t)值分布

      Fig.  9.  εHf(t)values of diagenetic zircon (a) and residual zircons (b) for sample PM301/1

      图  10  大磊山岩体片麻状花岗岩(a)10 000×Ga/Al-Ce和(b)10 000×Ga/Al-Zr判别图解

      Whalen et al.(1987);红色圆圈代表中粗粒片麻状花岗岩,黑色圆圈代表细粒片麻状花岗岩

      Fig.  10.  Dicrimination diagrams of (a) 10 000×Ga/Al-Ce and (10 000×Ga/Al-Zr) for the Daleishan gneissic granite

      图  11  大磊山岩体片麻状花岗岩εHf(t)-成岩年龄(t)图解

      红色为样品D6597,黑色为样品PM301/1

      Fig.  11.  Age (t) versus εHf(t) values diagrams for the Daleishan gneissic granite

      图  12  (a)Y/Nb-Ce/N和(b)Nb-Y-Ce判别图解

      A1.非造山环境; A2.后碰撞环境; OIB.洋岛; IAB.岛弧; 图据Eby et al.(1992)Pearce et al.(1984); 黑色圆圈代表细粒片麻状花岗岩,红色圆圈代表中粗粒片麻状花岗岩

      Fig.  12.  Dicrimination diagrams of (a) Y/Nb-Ce/ Nb and (b) Nb-Y-Ce for the Daleishan gneissic granite

      表  1  大磊山岩体片麻状花岗岩主量(%)及微量元素(10-6)分析结果

      Table  1.   Major (%) and trace element (10-6) compositions of the Daleishan gneissic granite

      岩性样号 中粗粒片麻状花岗岩 细粒片麻状花岗岩
      D3034/1 D2114/1 D3155/1 D4213/1 D3016/1 D6597/1 D3155/1 D3006/1
      SiO2 75.59 74.55 76.20 74.70 73.18 77.40 76.34 76.79
      TiO2 0.16 0.11 0.19 0.21 0.26 0.10 0.09 0.09
      Al2O3 13.06 13.92 12.70 13.50 13.83 12.11 12.35 12.26
      Fe2O3 0.89 1.24 1.02 1.07 1.80 0.39 0.41 0.73
      FeO 0.37 0.25 0.32 0.58 0.68 0.67 0.49 0.59
      FeOT 1.17 1.37 1.24 1.54 2.30 1.02 0.85 1.25
      MnO 0.06 0.02 0.03 0.04 0.11 0.02 < 0.01 0.02
      MgO 0.21 0.25 0.31 0.34 0.31 0.19 0.10 0.15
      CaO 0.60 0.13 0.19 0.64 0.68 0.10 0.21 0.08
      Na2O 3.50 4.28 3.49 3.92 3.89 2.77 3.33 3.63
      K2O 4.69 4.14 4.78 4.24 4.19 5.84 5.37 4.77
      P2O5 0.03 0.03 0.04 0.05 0.06 0.01 0.01 < 0.01
      LOI 0.64 0.90 0.58 0.57 0.80 0.35 0.71 0.52
      Rb 184.40 188.10 180.54 147.00 107.64 197.59 229.00 188.50
      Ba 421.55 419.80 233.65 1164.35 761.70 179.13 179.13 268.69
      Th 18.51 20.34 26.94 12.85 8.50 24.00 24.50 26.60
      U 1.94 2.09 1.73 1.60 1.42 5.45 2.85 4.88
      Nb 19.03 12.32 20.87 12.30 18.12 15.80 20.90 19.60
      Sr 50.89 40.78 28.14 89.60 64.51 18.80 25.60 34.20
      Nd 31.50 15.52 28.07 32.70 56.47 33.60 49.20 18.30
      Zr 128.00 160.50 131.50 179.00 300.20 119.00 139.00 126.00
      Hf 3.42 4.59 5.06 4.80 9.43 4.70 5.60 5.20
      Yb 4.17 3.30 4.05 2.89 4.52 2.94 5.74 5.00
      Lu 0.67 0.55 0.62 0.42 0.70 0.51 0.85 0.77
      Y 36.20 30.41 30.68 23.50 49.56 20.40 60.30 39.80
      La 38.95 21.99 43.14 43.20 66.11 28.60 58.10 20.90
      Ce 82.05 38.44 100.30 91.00 92.46 80.60 93.00 33.80
      Pr 8.69 4.44 8.47 8.89 14.74 10.80 13.75 5.15
      Nd 31.5 15.52 28.07 32.70 56.47 33.60 49.20 18.30
      Sm 5.98 3.23 4.90 5.79 10.44 6.62 10.40 4.09
      Eu 0.57 0.45 0.52 0.92 1.26 0.35 0.59 0.24
      Gd 5.38 3.36 4.50 4.60 9.34 3.79 9.70 3.88
      Tb 1.01 0.73 0.80 0.72 1.57 0.59 1.64 0.73
      Dy 6.13 4.79 4.75 4.26 8.41 3.71 9.91 5.33
      Ho 1.31 1.02 1.08 0.92 1.79 0.78 1.98 1.28
      Er 3.93 3.01 3.37 2.53 4.83 2.32 5.56 4.09
      Tm 0.64 0.50 0.61 0.41 0.74 0.39 0.88 0.70
      Yb 4.17 3.30 4.05 2.89 4.52 2.94 5.74 5.00
      Lu 0.67 0.55 0.62 0.42 0.70 0.51 0.85 0.77
      ΣREE 191.00 101.32 205.18 199.25 273.40 175.60 261.30 104.26
      LREE/HREE 7.21 4.87 9.37 10.90 7.57 10.68 6.21 3.79
      LaN/YbN 6.70 4.78 7.63 10.72 10.48 6.98 7.26 3.00
      δEu 0.30 0.41 0.33 0.53 0.38 0.20 0.18 0.18
      下载: 导出CSV

      表  2  大磊山岩体片麻状花岗岩D6597 LA-ICP-MS岩浆锆石U-Pb定年结果

      Table  2.   LA-ICP-MS zircon U-Pb data of the gneissic granite sample D6597 in the Daleishan granitoid

      点号 含量(10-6) Th/U U-Th-Pb同位素比值±1σ 同位素年龄(Ma)±1σ
      232Th 238U 207Pb/206Pb 207Pb/235U 206Pb/238U 207Pb/206Pb 207Pb/235U 206Pb/238U
      D6597-01 531.90 490.23 1.085 0.065 3±0.002 4 1.173 2±0.043 6 0.130 2±0.001 3 783.34±77.77 788.12±20.36 789.03±7.37
      D6597-02 408.63 444.65 0.919 0.068 9±0.002 2 1.261 7±0.040 6 0.133 0±0.001 4 894.45±66.67 828.69±18.24 804.98±7.93
      D6597-03 640.43 553.35 1.157 0.067 8±0.001 9 1.215 5±0.033 0 0.130 4±0.001 1 861.11±56.64 807.72±15.13 790.34±6.45
      D6597-04 1 998.20 430.26 4.644 0.064 7±0.001 9 1.180 2±0.034 9 0.132 4±0.001 1 764.82±62.96 791.41±16.25 801.41±6.27
      D6597-05 796.04 892.36 78.250 0.101 7±0.002 7 1.733 2±0.044 8 0.124 3±0.001 1 1 654.63±48.92 1 020.95±16.66 755.40±6.18
      D6597-06 467.19 309.26 1.511 0.068 1±0.002 6 1.235 9±0.046 4 0.133 3±0.001 4 872.22±79.63 817.03±21.10 806.60±8.00
      D6597-07 621.16 600.89 1.034 0.068 7±0.001 8 1.247 7±0.033 8 0.132 0±0.001 1 900.00±55.55 822.37±15.28 799.28±6.22
      D6597-08 596.53 460.37 1.296 0.066 0±0.002 1 1.199 7±0.037 3 0.132 3±0.001 1 805.56±66.66 800.45±17.23 801.12±6.34
      D6597-09 1341.2 966.65 5.488 0.049 8±0.003 3 0.133 7±0.008 5 0.019 8±0.000 3 187.12±149.06 127.38±7.61 126.26±1.72
      D6597-10 513.78 546.20 91.760 0.087 9±0.002 6 1.687 8±0.051 0 0.138 6±0.001 3 1 379.94±55.56 1 003.93±19.26 836.70±7.39
      D6597-11 388.97 447.97 0.868 0.063 4±0.002 3 1.158 8±0.041 5 0.133 1±0.001 5 720.38±79.62 781.41±19.53 805.25±8.4
      D6597-12 569.85 598.38 0.952 0.067 7±0.001 9 1.248 9±0.035 5 0.133 8±0.001 2 858.94±59.26 822.89±16.04 809.54±7.07
      D6597-13 897.38 414.37 2.166 0.062 6±0.002 2 1.142 9±0.038 9 0.132 7±0.001 3 694.46±74.07 773.90±18.43 803.51±7.27
      D6597-14 638.29 593.35 1.076 0.065 3±0.001 7 1.196 5±0.031 7 0.132 3±0.001 1 783.34±55.55 798.98±14.65 800.92±6.08
      D6597-15 483.17 584.33 0.827 0.070 0±0.001 8 1.2833±0.0316 0.132 5±0.001 1 927.78±56.48 838.34±14.05 802.37±6.11
      D6597-16 908.71 596.97 1.522 0.067 3±0.002 1 1.224 3±0.035 6 0.131 8±0.001 1 850.00±69.44 811.74±16.26 798.00±6.40
      D6597-17 1 211.20 391.78 3.091 0.064 2±0.001 9 1.1904±0.034 7 0.133 8±0.001 3 746.30±62.96 796.17±16.08 809.78±7.48
      D6597-18 366.78 265.91 1.379 0.065 6±0.002 5 1.2028±0.044 1 0.133 8±0.001 4 792.28±81.47 801.89±20.33 809.55±7.97
      D6597-19 284.32 241.60 1.177 0.061 3±0.002 7 1.110 1±0.047 6 0.131 2±0.001 4 650.02±94.43 758.22±22.90 794.85±7.91
      D6597-20 412.69 315.25 1.309 0.062 4±0.002 4 1.131 9±0.043 4 0.132 2±0.001 4 700.01±81.47 768.64±20.68 800.19±8.00
      D6597-21 567.14 491.47 1.154 0.0656±0.002 4 1.190 3±0.046 6 0.131 6±0.001 2 792.28±77.77 796.09±21.61 797.15±6.68
      D6597-22 439.25 468.36 0.938 0.063 8±0.002 6 1.159 0±0.050 7 0.132 2±0.001 1 744.45±85.18 781.50±23.86 800.56±6.42
      D6597-23 423.42 455.92 0.929 0.061 4±0.002 7 1.114 0±0.054 7 0.132 7±0.001 2 651.56±87.95 760.11±26.27 803.46±7.04
      D6597-24 306.31 293.09 1.045 0.062 2±0.003 5 1.133 8±0.07 1 0.133 4±0.001 4 679.64±113.87 769.54±33.78 807.03±8.07
      下载: 导出CSV

      表  3  大磊山岩体片麻状花岗岩PM301/1 LA-ICP-MS岩浆锆石U-Pb定年结果

      Table  3.   3LA-ICP-MS zircon U-Pb data of the gneissic granite sample PM301/1 in the Daleishan granitoid

      点号 含量(10-6) Th/U U-Th-Pb同位素比值±1σ 同位素年龄(Ma)±1σ
      232Th 238U 207Pb/206Pb 207Pb/235U 206Pb/238U 207Pb/206Pb 207Pb/235U 206Pb/238U
      PM302/1-01 493.22 509.06 0.969 0.070 5±0.002 2 1.260 2±0.037 7 0.128 7±0.001 2 942.6±63.0 828.0±17.0 780.5±6.9
      PM302/1-02 463.13 282.87 1.637 0.068 2±0.002 9 1.213 0±0.050 8 0.128 8±0.001 7 875.9±88.1 806.6±23.3 781.1±9.8
      PM302/1-03 229.98 234.10 0.982 0.072 5±0.003 3 1.333 2±0.058 9 0.133 2±0.000 2 999.1±91.5 860.3±25.6 805.9±11.6
      PM302/1-04 302.45 266.40 1.135 0.071 4±0.002 8 1.285 2±0.048 3 0.130 6±0.001 7 968.5±84.3 839.2±21.5 791.2±9.8
      PM302/1-05 978.17 367.85 2.659 0.066 5±0.002 9 1.205 2±0.054 9 0.129 6±0.001 8 821.9±91.5 803.0±25.3 785.5±10.3
      PM302/1-06 547.85 490.63 1.117 0.065 7±0.002 6 1.308 9±0.050 0 0.142 8±0.001 6 798.2±78.7 849.7±22.0 860.5±8.9
      PM302/1-07 407.41 251.32 1.621 0.063 3±0.002 7 1.157 7±0.047 7 0.132 5±0.001 5 720.4±86.1 780.9±22.5 802.2±8.6
      PM302/1-08 396.84 384.01 1.033 0.069 6±0.002 2 1.263 7±0.037 5 0.131 7±0.001 2 916.7±65.6 829.6±16.8 797.6±7.0
      PM302/1-09 333.75 379.50 0.879 0.064 7±0.002 3 1.180 0±0.040 7 0.132 2±0.001 4 764.8±75.9 791.3±19.0 800.4±7.8
      PM302/1-10 1033.79 352.16 2.936 0.067 9±0.002 6 1.297 5±0.049 0 0.138 0±0.001 6 877.8±77.8 844.6±21.7 833.2±9.3
      PM302/1-11 288.34 250.45 1.151 0.064 2±0.003 1 1.203 6±0.054 4 0.137 7±0.002 2 750.0±103.7 802.2±25.1 831.7±12.4
      PM302/1-12 84.01 106.6 0.788 0.075 0±0.005 5 1.409 8±0.091 7 0.141 0±0.002 5 1 069.4±146.3 893.1±38.7 850.2±14.1
      PM302/1-13 603.18 257.29 2.344 0.071 3±0.003 0 1.284 1±0.054 0 0.131 7±0.001 5 964.8±87.0 838.7±24.0 797.5±8.6
      PM302/1-14 265.49 342.78 0.775 0.065 7±0.002 6 1.208 8±0.046 4 0.134 5±0.001 4 794.4±82.6 804.6±21.3 813.7±8.2
      PM302/1-15 494.92 515.50 0.960 0.075 0±0.002 9 1.330 4±0.051 5 0.128 8±0.001 2 1 133.3±79.6 859.1±22.4 781.3±7.0
      PM302/1-16 456.10 398.82 1.144 0.065 5±0.002 7 1.199 7±0.050 4 0.132 6±0.0018 790.7±87.0 800.4±23.2 802.6±10.1
      PM302/1-17 417.77 404.34 1.033 0.066 7±0.002 5 1.2183±0.045 3 0.133 0±0.001 8 827.8±79.6 809.0±20.7 804.7±10.2
      PM302/1-18 218.38 295.86 0.738 0.065 5±0.002 9 1.194 9±0.052 3 0.133 0±0.001 6 790.7±92.6 798.2±24.2 804.7±8.8
      PM302/1-19 418.33 407.06 1.028 0.064 3±0.002 2 1.239 5±0.041 1 0.140 4±0.001 3 750.0±78.7 818.7±18.6 846.8±7.3
      PM302/1-20 228.57 211.42 1.081 0.060 7±0.003 1 1.111 0±0.055 2 0.134 1±0.001 8 627.8±105.4 758.7±26.6 811.5±10.0
      PM302/1-21 243.23 272.66 0.892 0.064 7±0.002 8 1.222 7±0.053 1 0.138 3±0.002 4 764.8±60.2 811.0±24.3 834.9±13.6
      下载: 导出CSV

      表  4  大磊山岩体片麻状花岗岩D6597岩浆锆石Hf同位素组成

      Table  4.   Lu-Hf isotope compositions of the gneissic granite sample D6597 in the Daleishan granitoid

      点号 176Hf/177Hf 1σ 176Lu/177Hf 1σ 176Yb/177Hf 1σ t(Ma) εHf(0) 1σ εHf(t) 1σ tDM1 (Ma) tDM2 (Ma) fLu/Hf
      1 0.282 125 0.000 017 0.001 091 0.000 008 0.033 252 0.000 48 796 -22.87 0.8 -5.87 0.84 1 590.61 1 901.71 -0.97
      2 0.282 275 0.000 027 0.001 962 0.000 043 0.061 676 0.001 86 796 -17.56 1.09 -1.02 1.13 1 413.81 1 635.68 -0.94
      3 0.282 558 0.000 037 0.003 757 0.000 032 0.118 907 0.000 55 796 -7.579 1.41 8.02 1.44 1 059.84 1 136.98 -0.89
      4 0.282 112 0.000 026 0.001 013 0.000 016 0.028 364 0.000 68 796 -23.33 1.04 -6.30 1.08 1 605.60 1 924.94 -0.97
      5 0.282 176 0.000 019 0.001 063 0.000 002 0.030 677 0.000 28 861 -21.09 0.84 -2.68 0.88 1 519.65 1 778.22 -0.97
      6 0.282 249 0.000 024 0.001 529 0.000 058 0.045 529 0.001 37 796 -18.51 0.98 -1.74 1.04 1 435.15 1 674.98 -0.95
      7 0.282 245 0.000 025 0.002 027 0.000 026 0.059 721 0.000 38 833 -18.64 1.01 -1.36 1.05 1 459.81 1 683.41 -0.94
      8 0.282 135 0.000 021 0.001 050 0.000 006 0.030 248 0.000 10 832 -22.52 0.91 -4.73 0.95 1 575.37 1 867.56 -0.97
      9 0.282 175 0.000 021 0.001 107 0.000 009 0.031 941 0.000 40 796 -21.13 0.9 -4.14 0.94 1 522.64 1 806.71 -0.97
      10 0.282 215 0.000 020 0.001 211 0.000 009 0.036 462 0.000 55 796 -19.69 0.87 -2.76 0.91 1 469.94 1 730.81 -0.96
      下载: 导出CSV

      表  5  大磊山岩体片麻状花岗岩PM301-1岩浆锆石Hf同位素组成

      Table  5.   Lu-Hf isotope compositions of the gneissic granite sample PM301-1 in the Daleishan granitoid

      点号 176Hf/177Hf 1σ 176Lu/177Hf 1σ 176Yb/177Hf 1σ t(Ma) εHf(0) 1σ εHf(t) 1σ tDM1 (Ma) tDM2 (Ma) fLu/Hf
      1 0.282 420 0.000 032 0.003 008 0.000 059 0.091 968 0.001 575 781 -12.5 1.2 3.2 1.3 1 242 1 390 -0.91
      2 0.282 105 0.000 019 0.001 089 0.000 028 0.029 445 0.000 898 806 -23.6 0.8 -6.4 0.9 1 619 1 937 -0.97
      3 0.282 146 0.000 026 0.001 103 0.000 007 0.031 471 0.000 352 791 -22.2 1.0 -5.3 1.1 1 563 1 865 -0.97
      4 0.282 510 0.000 035 0.003 061 0.000 047 0.091 394 0.001 780 786 -9.3 1.4 6.5 1.4 1 110 1 212 -0.91
      5 0.282 242 0.000 023 0.001 584 0.000 010 0.047 003 0.000 394 861 -18.8 1.0 -0.6 1.0 1 447 1 666 -0.95
      6 0.282 167 0.000 026 0.001 228 0.000 013 0.034 397 0.000 292 800 -21.4 1.0 -4.4 1.1 1 538 1 823 -0.96
      7 0.282 488 0.000 034 0.003 183 0.000 031 0.095 571 0.000 469 833 -10.0 1.3 6.6 1.3 1 146 1 245 -0.90
      8 0.282 182 0.000 028 0.001 306 0.000 053 0.038 229 0.001 508 832 -20.9 1.1 -3.2 1.2 1 520 1 784 -0.96
      9 0.282 228 0.000 031 0.001 816 0.000 022 0.054 271 0.000 568 802 -19.2 1.2 -2.5 1.2 1 475 1 721 -0.95
      10 0.282 241 0.000 027 0.001 609 0.000 071 0.046 716 0.001 961 798 -18.8 1.1 -2.0 1.1 1 449 1 691 -0.95
      11 0.282 085 0.000 022 0.000920 0.000 008 0.026 532 0.000 377 781 -24.3 0.9 -7.5 1.0 1 639 1 981 -0.97
      12 0.282 126 0.000 023 0.001 195 0.000 008 0.035 452 0.000 332 803 -22.8 1.0 -5.8 1.0 1 594 1 901 -0.96
      13 0.282 221 0.000 029 0.001 675 0.000 113 0.053 218 0.004 902 805 -19.5 1.1 -2.6 1.2 1 479 1 729 -0.95
      14 0.282 161 0.000 022 0.001 111 0.000 007 0.032 048 0.000 136 847 -21.6 0.9 -3.5 1.0 1 541 1 812 -0.97
      15 0.282 196 0.000 025 0.001 712 0.000 024 0.046 725 0.000 816 812 -20.4 1.0 -3.3 1.1 1 516 1 776 -0.95
      下载: 导出CSV
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