广西六万山印支早期花岗岩地球化学特征及锆石U-Pb年龄

黄诚, 沈睿文, 南争路, 傅良刚, 刘胜, 蔡砥柱, 王慧, 余杨忠. 广西六万山印支早期花岗岩地球化学特征及锆石U-Pb年龄[J]. 地质通报, 2017, 36(2-3): 209-223.
引用本文: 黄诚, 沈睿文, 南争路, 傅良刚, 刘胜, 蔡砥柱, 王慧, 余杨忠. 广西六万山印支早期花岗岩地球化学特征及锆石U-Pb年龄[J]. 地质通报, 2017, 36(2-3): 209-223.
HUANG Cheng, SHEN Ruiwen, NAN Zhenglu, FU Lianggang, LIU Sheng, CAI Dizhu, WANG Hui, YU Yangzhong. Zircon U-Pb ages and geochemical characteristics of Early Indosinian Liuwanshan granites, Guangxi[J]. Geological Bulletin of China, 2017, 36(2-3): 209-223.
Citation: HUANG Cheng, SHEN Ruiwen, NAN Zhenglu, FU Lianggang, LIU Sheng, CAI Dizhu, WANG Hui, YU Yangzhong. Zircon U-Pb ages and geochemical characteristics of Early Indosinian Liuwanshan granites, Guangxi[J]. Geological Bulletin of China, 2017, 36(2-3): 209-223.

广西六万山印支早期花岗岩地球化学特征及锆石U-Pb年龄

  • 基金项目:
    中国地质调查局项目《广西钦杭成矿带西段博白县、六万山幅1:5万区域地质矿产调查》(编号:12120113072000)
详细信息
    作者简介: 黄诚 (1987-), 男, 硕士, 工程师, 从事成矿作用地球化学研究。E-mail:hc_learn@126.com
  • 中图分类号: P588.12+1

Zircon U-Pb ages and geochemical characteristics of Early Indosinian Liuwanshan granites, Guangxi

  • 广西六万山印支早期花岗岩的岩性主要为堇青黑云二长花岗岩,根据岩石结构特征及侵入接触关系可划分为4个侵入单元。利用LA-ICP-MS U-Pb同位素测定技术,4个侵入单元的锆石206Pb/238U年龄加权平均值分别为252.8±1.9Ma(MSWD=0.92)、249.2±1.9Ma(MSWD=1.2)、248.3±3.2Ma(MSWD=2.1)、246.8±2.8Ma(MSWD=2.2)。地球化学分析结果表明,花岗岩在岩石化学上富集大离子亲石元素Rb、K等,相对亏损高场强元素Ta、Nb、Ti等,反映出与俯冲带有关的岛弧岩浆岩相似的地球化学特征。稀土元素球粒陨石标准化配分曲线呈右倾型,具明显的Eu负异常,相对富集重稀土元素,与典型壳源花岗岩配分曲线一致。部分熔融与分离结晶模型(La/Sm-La)显示,花岗岩主要由部分熔融作用形成,演化过程经历了一定程度的分离结晶作用。结合花岗岩岩石化学特征、微量元素地球化学特征及花岗岩构造环境判别图解,认为六万山印支早期花岗岩的形成经历了早期洋-陆俯冲阶段到晚期陆-陆碰撞阶段的构造演化过程。

  • 加载中
  • 图 1  大容山-十万大山花岗岩带地质简图(据参考文献[3-4]修改)

    Figure 1. 

    图 图版Ⅰ  A.中细粒斑状堇青黑云二长花岗岩(ηγcT11);B.中粒(斑状)堇青黑云二长花岗岩(ηγcT21);C.中粗粒(斑状)堇青黑云二长花岗岩(ηγcT31);D.细粒堇青黑云二长花岗岩(ηγcT61);E. ηγcT11镜下特征(正交偏光);F. ηγcT31镜下特征(正交偏光)。Q—石英;Kfs—钾长石;Pl—斜长石;Bt—黑云母;Crd—董青石

    图 2  六万山印支早期花岗岩微量元素蛛网图(球粒陨石标准值据参考文献[16];图例代号同图 1

    Figure 2. 

    图 3  六万山印支早期花岗岩稀土元素配分曲线(球粒陨石标准值据参考文献[16];图例代号见表 1

    Figure 3. 

    图 4  六万山印支早期花岗岩特征值相关曲线(图例代号同图 1

    Figure 4. 

    图 5  六万山印支早期花岗岩锆石阴极发光图像和锆石U-Pb谐和图

    Figure 5. 

    图 6  六万山印支早期花岗岩La-La/Sm图解(图例代号同图 1

    Figure 6. 

    图 7  六万山印支早期花岗岩的构造环境判别图解(图例代号同图 1

    Figure 7. 

    表 1  六万山印支早期花岗岩主量、微量和稀土元素组成及其相关参数

    Table 1.  Major, trace elements and REE composition and related parameters of Early Indosinian Liuwanshan granites

    侵位单元
    样品编号
    ηγcT11ηγcT21ηγcT31ηγcT61
    D4054-
    Rz1
    D4059-
    Rz1
    D5170-
    Rz1
    D5174-
    Rz1
    D2706-
    Rz1
    D1210-
    Rz1
    D2682-
    Rz1
    D1054-
    TW1
    PM03-37-
    Rz1
    PM03-
    43-GSY
    PM03-
    9-XT1
    D2524-
    Rz1
    PM03-
    41-Rz1
    D5361-
    Rz2
    D1218-
    Rz2
    D5475-
    Rz1
    SiO273.3368.9968.3570.8770.1876.8273.2972.7070.1172.3369.0874.4976.2175.4276.7673.66
    TiO20.650.600.630.580.540.300.480.410.470.150.340.390.080.080.120.15
    Al2O316.5117.5615.4914.0514.3011.8713.1113.1214.9115.4016.2612.5213.5113.0913.2513.64
    Fe2O30.861.271.171.060.430.020.210.100.110.101.350.120.320.280.280.60
    FeO2.122.242.842.643.192.182.972.282.990.931.172.170.360.670.122.11
    CaO0.090.272.501.321.830.631.011.270.960.180.161.450.260.310.270.11
    MgO0.171.351.601.401.400.571.190.750.900.240.460.620.070.170.090.27
    MnO0.0050.0480.0540.0420.0660.0530.0570.0560.0660.0440.0440.0540.0250.0170.0330.026
    Na2O0.190.462.292.102.141.851.932.091.511.501.482.022.192.182.320.83
    K2O3.604.562.783.923.904.264.034.645.286.446.464.665.426.955.816.14
    P2O50.1230.1600.1840.1990.1650.1660.1740.1780.1940.1540.1730.1820.1630.1100.1240.121
    LOI (烧失量)2.162.301.941.651.711.201.432.282.372.452.931.211.360.690.792.33
    总量99.8299.8199.8499.8399.8699.9299.8799.8899.8899.9399.9199.8899.9899.9899.9799.98
    Na2O+K2O3.795.025.076.026.056.105.966.736.807.947.946.687.619.138.136.96
    K2O/Na2O18.909.871.211.871.822.302.082.223.494.284.362.312.473.182.517.43
    A/CNK3.772.841.371.391.291.351.401.221.501.581.671.141.361.121.251.66
    A/NK3.933.092.281.831.851.551.741.551.821.631.721.501.431.181.311.71
    La47.662.852.047.140.4429.2833.8131.2732.4119.3252.4031.849.8064.412.7220.9
    Ce103.0129.0100.095.381.1360.5068.1763.2166.6040.3394.9366.0323.5113130.1143.3
    Pr11.915.411.911.19.637.458.067.548.084.7213.827.842.9514.83.825.34
    Nd49.360.446.845.635.2027.3229.9028.2030.2716.5349.9829.3910.5360.313.3320.8
    Sm9.3611.28.468.377.146.495.876.046.914.0310.216.663.7511.54.465.58
    Eu2.081.361.811.471.140.651.050.890.960.671.270.920.131.250.160.35
    Gd7.809.287.396.716.136.105.215.306.563.627.316.063.689.314.234.16
    Tb1.391.551.121.190.871.180.780.791.090.671.041.050.871.541.011.16
    Dy7.288.114.996.284.737.194.494.366.474.395.476.305.927.747.038.63
    Ho1.311.530.891.200.871.390.810.771.210.840.961.201.081.301.351.80
    Er3.143.902.172.932.273.632.232.063.082.242.553.182.543.063.464.25
    Tm0.600.730.380.550.370.590.360.330.490.380.410.520.390.490.600.91
    Yb3.264.142.173.112.193.462.122.122.942.362.403.052.162.603.304.65
    Lu0.490.620.310.450.370.570.330.360.460.440.430.480.470.400.650.77
    Y30.838.821.430.223.7737.7122.5121.9833.0423.8623.6032.9831.9533.839.1250.0
    LREE222.87280.46221.26208.91174.68131.70146.86137.14145.2385.59222.61142.6950.67283.5564.6096.15
    HREE25.2729.8519.4222.4117.8124.1216.3216.0922.2814.9320.5721.8417.1226.4421.6226.33
    ΣREE248.14310.31240.67231.33192.49155.82163.19153.23167.50100.53243.18164.5367.79310.0086.23122.49
    LREE/HREE8.829.3911.399.329.815.469.008.526.525.7310.826.532.9610.722.993.65
    δEu0.7440.4080.6980.5980.5260.3180.5810.4810.4340.5370.4480.4450.1040.3700.1140.223
    δCe1.0581.0190.9881.0211.0081.0041.0121.0101.0091.0360.8651.0251.0711.0421.0591.004
    (La/Yb)N10.4810.8817.2010.8613.226.0711.4510.587.925.8615.687.483.2617.762.763.22
    (La/Sm)N3.283.633.973.633.662.913.723.343.033.103.313.081.693.621.842.42
    (Gd/Yb)N1.981.852.821.782.311.462.032.071.851.272.521.641.412.961.060.74
    Li33.456.939.246.679.6454.3747.2356.2330.7933.6171.0933.2322.3113.719.2469.8
    Be0.971.861.861.632.742.201.951.913.171.302.361.722.270.880.811.04
    Sc10.238.847.868.9310.2510.1613.6710.226.475.757.958.883.831.958.263.30
    V63.863.559.458.460.643.272.052.942.122.040.442.013.76.3320.33.43
    Cr31.927.734.528.637.525.341.324.326.713.018.918.210.81.9411.01.93
    Co2.699.8311.29.6510.24.59.86.47.82.46.84.71.21.380.22.31
    Ni7.2117.217.519.020.19.422.711.712.53.78.97.41.50.720.82.03
    Ga21.020.418.419.120.2616.9719.5919.8722.6820.2222.0316.9819.3912.718.1016.0
    Rb12316772.2175223.5275.0221.9271.5326.8360.4356.5224.0342.6266345.3332
    Sr10440.111595.3104.533.692.471.754.533.244.459.112.834.614.28.8
    Zr299315292268201.4161.4170.5177.7185.2111.9178.0196.675.510496.0104
    Nb10.810.59.1713.217.7713.3919.7816.3112.3610.0813.9313.5713.933.0413.3410.5
    In0.0830.0580.0610.0690.120.120.100.110.100.120.110.070.140.0460.100.11
    Cs6.313.78.6316.331.1423.4615.5718.1319.3716.0321.4011.059.686.648.4314.7
    Ba568638421531494.0173.6591.7516.5538.4285.3391.2401.623.054.525.335.7
    Hf10.211.410.58.837.166.185.605.629.794.827.799.543.303.713.373.54
    Ta1.111.220.821.331.400.861.681.421.501.231.471.062.150.481.461.43
    W1.991.150.921.282.862.391.020.683.813.302.631.432.162.293.111.79
    Tl0.480.700.510.781.231.290.971.321.761.611.811.011.811.281.511.47
    Pb40.838.024.232.130.925.031.334.134.742.646.028.232.244.432.033.0
    Bi0.690.860.520.560.150.270.480.650.780.651.300.300.857.521.071.49
    Th15.521.412.916.916.3511.6313.3312.1121.4611.4216.0914.8513.78.2611.4912.4
    U4.553.612.823.364.593.693.848.077.133.513.974.936.34.585.934.49
    Sn5.975.302.513.665.75.74.76.64.48.19.94.47.33.616.87.25
    As89.01.83.04.53.96.11.28.617.81.23.11.60.91.56.21.3
    Sb15.10.250.200.450.050.200.050.750.650.140.280.120.230.170.420.21
     注:样品岩石地球化学分析由河北省区域地质矿产调查研究所实验室完成。其中ηγcT119件;ηγcT21 19件;ηγcT31 10件;ηγcT61 8件,文中仅对每个侵位单元列出4个,共12个样品的分析结果。铝饱和指数A/CNK=Al2O3/(CaO+Na2O+K2O)(摩尔分数比);A/NK=Al2O3/(Na2O+K2O) (摩尔分数比),比值单位为1。主量元素含量单位为%,稀土和微量元素含量为10-6ηγcT21 —中细粒堇青黑云二长花岗岩;ηγcT21 —中粒(斑状)堇青黑云二长花岗岩;ηγcT31 —中粗粒(斑状)堇青黑云二长花岗岩;ηγcT61 —细粒堇青黑云二长花岗岩
    下载: 导出CSV

    表 2  六万山印支早期花岗岩单颗粒锆石U-Th-Pb同位素测定结果

    Table 2.  U-Th-Pb isotopic dating results for the single-grain zircon from Early Indosinian Liuwanshan granites


    Pb232Th238U同位素比值年龄/Ma
    /10-6207Pb/206Pb207Pb/235U206Pb/238U208Pb/232Th207Pb/206Pb207Pb/235U206Pb/238U208Pb/ 232Th
    D4054-Rz1
    1.111116629390.05260.00170.3060.0100.041940.000530.014340.0007932275.92718.12653.328816
    2.125943522190.05640.00160.4970.0170.063490.001150.023750.0006546530.641011.43977.047413
    3.1461844150.05760.00440.2490.0240.039770.000680.011770.0006151721522619.42514.223712
    4.11413646190.05300.00300.4560.0230.062430.001210.018720.0006633212838215.73907.437513
    5.17515811350.05480.00260.3010.0150.039880.000440.011920.00066467105.526711.32522.724013
    6.113015742310.04970.00160.2650.0090.038960.000700.013930.0007718975.92387.52464.328015
    7.17324210570.05490.00270.3070.0150.040570.000520.011560.0005546911427211.82563.223211
    8.17515415410.04710.00190.2630.0110.040320.000390.013550.0007110296.32379.02552.427214
    9.112549012530.05470.00230.3030.0130.040170.000430.012470.0004046794.426910.02542.62518
    10.13204049940.06840.00221.1510.0520.117490.003930.033550.0014088066.777824.571622.766727
    11.17016015690.05340.00200.2910.0110.039630.000410.011690.0006534387.02598.52512.623513
    12.124924413790.06970.00201.0190.0340.104840.001800.038250.0013892063.971317.164310.575927
    13.114112143430.05680.00170.3210.0100.040600.000480.016910.0010948364.82838.02573.033922
    14.15913113560.05150.00240.2790.0130.039700.000410.013390.0007826510724910.02512.526916
    15.1991769160.05720.00220.6290.0390.074030.003080.021720.0012850285.249524.146018.543425
    16.17812911160.06180.00250.5620.0300.062750.002020.016010.0009873380.545319.239212.232120
    D2706-Rz1
    1.1420.05250.00280.2480.0150.039180.000500.011350.0009031613722511.82483.122818
    2.1641939810.05290.00250.3840.0210.050120.001200.012560.0006632410733015.73157.325213
    3.15412211060.05550.00260.3070.0140.040470.000460.016100.0008343210427210.72562.932317
    4.12142934950.07090.00231.4990.0520.152550.002220.044670.0012895467.893021.091512.488325
    5.1561997830.05310.00290.3000.0170.041100.000550.013560.0006433211926613.02603.427213
    6.119239312400.09820.00391.1560.0650.077360.002580.023880.00151159172.778030.548015.447730
    7.16017212310.05540.00240.3020.0130.039400.000450.012930.0007142896.326810.32492.826014
    8.1542585490.05250.00360.2130.0190.039740.000590.012300.0006031787.819616.02513.724712
    9.116826912780.07580.00310.9790.0640.082110.003010.028370.00170110083.369332.750917.956633
    10.18021816500.05040.00190.2750.0100.039400.000380.012700.0005621785.22478.12492.425511
    11.115811418540.06410.00140.8490.0200.095350.000980.024300.0011674647.162410.95875.848523
    12.1541157480.04980.00250.3590.0190.052630.001090.020040.0010918311931214.13316.740122
    13.14916310400.05040.00230.2750.0130.039640.000450.010300.0006821310724710.02512.820714
    14.14815510080.04950.00250.2630.0130.038610.000420.011350.0007116911423710.62442.622814
    15.1492046180.05340.00340.2880.0180.039370.000560.011720.0006034614325714.22493.523612
    16.1723986190.04990.00320.2680.0170.039180.000510.011300.0004219115624113.62483.22278
    PM03-29-Rz1
    1.1430.05100.00270.2740.0140.039310.004930.011930.0006124312224611.42493.124012
    2.117232551600.05030.00130.2540.0080.036450.000610.012380.0005020993.52296.22313.824910
    3.16314415690.05020.00200.2640.0100.038160.000390.013460.0008820686.12388.22412.527018
    4.1401735970.04940.00330.2660.0170.039840.000530.011550.0006316515224013.92523.323213
    5.1461667960.04820.00270.2630.0150.040200.000490.012940.0006810912623711.72543.126014
    6.123918318430.06680.00250.9740.0830.089520.005250.044680.0034283377.869142.755331.188466
    7.16019410930.05120.00220.2800.0120.039690.000450.012950.0006325698.12519.32512.826013
    8.19425419120.04840.00180.2820.0120.041860.000710.014980.0006811791.72539.62644.430114
    9.1361654100.05660.00520.3000.0270.039560.000640.013090.0006747623826721.22504.026314
    10.1421844930.04980.00460.2200.0240.040330.000690.013950.0007518778.620220.32554.328015
    PM03-29-Rz1
    11.1562227990.05290.00290.2800.0150.038430.000470.012820.0005532412425112.02432.925711
    12.1401087720.05600.00300.3020.0150.039380.000460.014940.0010245011926812.02492.930020
    13.1996017510.05030.00290.2450.0160.039930.000540.012190.0004120889.122213.32523.42458
    14.18219712280.04830.00190.3360.0170.049190.001290.017460.0008711786.129412.73108.035017
    15.17226111800.04980.00230.2660.0110.039130.000460.013630.000541871102399.02472.927411
    16.13548108520.06390.00220.7090.0320.078520.002170.032830.0008973974.154418.948713.065318
    D1218-Rz2
    1.15314211410.05370.00220.3630.0170.048600.000960.013360.0006236794.431512.33065.926812
    2.17918717240.05210.00300.2780.0160.039270.000540.012830.0005030013024912.62483.425810
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出版历程
收稿日期:  2015-09-30
修回日期:  2016-06-06
刊出日期:  2017-03-25

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