青海阿木尼克山地区牦牛山组火山岩地球化学特征、锆石U-Pb年龄及其地质意义

寇贵存, 冯金炜, 罗保荣, 周维贵, 柳树权. 青海阿木尼克山地区牦牛山组火山岩地球化学特征、锆石U-Pb年龄及其地质意义[J]. 地质通报, 2017, 36(2-3): 275-284.
引用本文: 寇贵存, 冯金炜, 罗保荣, 周维贵, 柳树权. 青海阿木尼克山地区牦牛山组火山岩地球化学特征、锆石U-Pb年龄及其地质意义[J]. 地质通报, 2017, 36(2-3): 275-284.
KOU Guicun, FENG Jinwei, LUO Baorong, ZHOU Weigui, LIU Shuquan. Zircon U-Pb dating and geochemistry of the volcanic rocks from Maoniushan Formation in Amunike area, Qinghai Province, and its geological implications[J]. Geological Bulletin of China, 2017, 36(2-3): 275-284.
Citation: KOU Guicun, FENG Jinwei, LUO Baorong, ZHOU Weigui, LIU Shuquan. Zircon U-Pb dating and geochemistry of the volcanic rocks from Maoniushan Formation in Amunike area, Qinghai Province, and its geological implications[J]. Geological Bulletin of China, 2017, 36(2-3): 275-284.

青海阿木尼克山地区牦牛山组火山岩地球化学特征、锆石U-Pb年龄及其地质意义

  • 基金项目:
    中国地质调查局项目《柴达木周缘及邻区成矿带地质矿产调查评价》下属研究项目《青海省都兰县阿木尼克山地区J47E017001、J47E018001、J47E018002、J47E019003 四幅1∶5 万区域地质矿产调查》(编号:1212011221146)
详细信息
    作者简介: 寇贵存(1992-),男,在读硕士生,矿物学、岩石学、矿床学专业。E-mail:kgc1992@126.com
    通讯作者: 冯金炜(1991-),男,在读硕士生,矿物学、岩石学、矿床学专业。E-mail:fengjw1991@163.com
  • 中图分类号: P588.14;P597+.3

Zircon U-Pb dating and geochemistry of the volcanic rocks from Maoniushan Formation in Amunike area, Qinghai Province, and its geological implications

More Information
  • 利用岩石地球化学分析和LA-ICP-MS锆石U-Pb定年方法,对阿木尼克山地区牦牛组火山岩进行了系统的地球化学特征和锆石U-Pb年代学研究。其地球化学特征为,SiO2含量介于53.94%~64.69%之间,全碱含量介于5.38%~9.86%之间,范围较大,里特曼指数介于1.45~4.54之间,属于碱性岩和钙碱性岩,铝饱和指数A/CNK均大于1.1,具有S型花岗岩的特征;稀土元素总量为68×10-6~372×10-6,LREE/HREE值介于4.51~18.25之间,轻稀土元素富集,重稀土元素亏损,稀土元素配分曲线右倾;微量元素中不相容元素Rb、Ba、Th富集,Ta、Nb亏损明显,蛛网曲线呈现峰谷迭起的曲线形式。锆石CL图像和U-Pb同位素分析结果显示,牦牛山组火山岩锆石自形程度好,均有岩浆振荡环带的特征,Th/U值介于0.4~1.3之间,属于岩浆成因锆石。测得该火山岩中2件样品的锆石206Pb/238U 年龄介于371~399Ma 之间,年龄加权平均值分别为374.8±3.1Ma 和392.4±3.3Ma,表明火山岩形成时代为中—晚泥盆世。结合区域特征,认为牦牛山组火山岩的形成与柴达木盆地北缘的演化有关,其是后碰撞阶段伸展作用的产物。

  • 加载中
  • 图 1  区域大地构造位置

    Figure 1. 

    图 2  牦牛山组火山岩TAS 图解

    Figure 2. 

    图 3  牦牛山组火山岩SiO2-K2O 图

    Figure 3. 

    图 4  牦牛山组安山岩(a)和酸性火山岩稀土元素配分图(b)

    Figure 4. 

    图 5  牦牛山组安山岩ORG 标准化蛛网图(a)和酸性火山岩ORG 标准化蛛网图(b)

    Figure 5. 

    图 6  火山岩代表性锆石阴极发光(CL)图像

    Figure 6. 

    图 7  牦牛山组火山岩LA-ICP-MS 锆石U-Pb谐和图(a、c)及206Pb/238U 年龄图(b、d)

    Figure 7. 

    图 8  安山岩Th-La/Yb 图解

    Figure 8. 

    图 9  酸性火山岩Y-Nb 图解

    Figure 9. 

    图 10  酸性火山岩SiO2-Al2O3图解

    Figure 10. 

    表 1  牦牛山组火山岩主量元素分析数据

    Table 1.  Major element compositions of the volcanic rocks in Maoniushan Formation

    %
    样品编号岩性SiO2Al2O3Fe2O3FeOMgOCaONa2OK2OTiO2MnOP2O5烧失量总量ALKδA / CNK
    P3-16 REE1粗面英安岩64.6913.792.560.500.462.960.149.180.110.0430.0334.7199.179.783.841.12
    P3-21 REE1流纹岩72.7711.550.740.350.142.151.088.390.100.0210.0192.4699.779.712.980.99
    P5-3 REE1流纹岩71.6712.031.520.470.801.541.876.060.270.0250.0533.3999.708.202.161.27
    P10-3 REE1英安质晶屑凝灰岩62.9914.103.921.700.853.083.914.500.530.0460.203.9299.768.763.401.23
    P10-5 REE1安山玻质岩61.8818.570.892.702.770.479.250.120.800.0140.271.8799.609.544.541.89
    P12-11 REE1粗面安山岩53.9416.834.752.544.124.186.171.181.050.0860.164.3199.317.694.421.46
    P12-12 REE1杏仁状流纹岩71.9914.081.250.260.190.702.975.960.370.0140.0821.8399.709.102.731.46
    YP07(3) REE1碳酸盐化流纹岩70.1312.620.190.530.912.113.855.700.220.0440.0553.1299.499.863.311.08
    D3450 REE1流纹岩73.0813.412.010.730.290.794.093.520.180.0190.0331.7499.897.741.911.60
    P16-60 REE1流纹岩69.6513.500.431.880.752.033.445.010.350.0410.0882.5599.738.672.641.29
    P19-6 REE1流纹岩76.6110.750.470.640.251.553.313.680.120.0320.0261.9299.367.121.451.26
    P19-30 REE1流纹岩67.6012.080.880.970.834.481.815.360.400.0480.0665.0399.567.552.021.04
    P19-32 REE1安山岩55.6616.772.544.873.966.543.321.931.120.130.2512.3099.395.382.071.42
    D3560GS1流纹岩75.4812.540.740.200.41.183.4513.7460.07210.01770.07211.7899.687.331.591.50
    D-D7015GS1凝灰岩70.8115.581.240.430.371.263.504.420.120.0160.0632.1099.908.082.231.70
    D4012GS1安山岩59.1516.731.225.312.193.554.491.871.100.0970.333.3599.386.582.381.69
    P35-35GS1流纹岩72.5614.210.810.150.600.683.424.150.0690.0210.0333.35100.057.831.911.72
    下载: 导出CSV

    表 2  牦牛山组火山岩稀土元素分析数据

    Table 2.  Rare earth element compositions of the volcanic rocks in Maoniushan Formation

    10-6
    样品
    编号
    岩性LaCePrNdSmEuGdTbDyHoErTmYbLuYΣREELREEHREELREE/
    HREE
    LaN/YbNδEu
    P3-16
    REE1
    粗面英
    安岩
    70.61157.9514.3957.9510.820.879.601.235.591.053.150.453.130.4725.56337.26312.6024.6612.6816.210.26
    P3-21
    REE1
    流纹岩34.6092.738.4034.676.940.647.281.267.341.524.540.674.390.6335.98205.61177.9727.646.445.650.27
    P5-3
    REE1
    流纹岩27.9873.956.8028.885.811.346.070.975.501.093.200.442.710.4024.41165.12144.7420.377.117.410.69
    P10-3
    REE1
    英安质晶
    屑凝灰岩
    27.9673.876.8529.986.211.596.401.055.961.243.870.553.560.5534.06169.64146.4623.186.325.630.76
    P10-5
    REE1
    安山玻
    质岩
    18.3643.374.6420.234.271.344.780.834.910.992.720.382.310.3430.29109.4792.2217.255.345.710.90
    P12-11
    REE1
    粗面安
    山岩
    13.3933.753.7917.483.971.584.320.734.430.922.820.402.600.4022.8490.5873.9616.634.453.701.16
    P12-12
    REE1
    杏仁状
    流纹岩
    20.0369.735.2922.824.931.065.030.834.730.962.810.422.700.4229.06141.76123.8617.906.925.320.64
    YP07(3)
    REE1
    碳酸盐化
    流纹岩
    82.39180.1715.4561.6610.051.449.101.054.410.802.460.342.280.3521.62371.95351.1720.7816.9025.940.45
    D3450
    REE1
    流纹岩19.0244.414.7319.613.881.123.800.593.270.641.980.292.020.3315.95105.6992.7712.927.186.750.88
    P16-60
    REE1
    流纹岩22.0458.655.0920.573.971.043.960.613.370.672.130.301.980.3018.38124.67111.3613.318.368.000.79
    P19-6
    REE1
    流纹岩21.5163.315.8825.685.880.596.321.086.651.404.160.624.080.6134.50147.77122.8624.914.933.780.30
    P19-30
    REE1
    流纹岩29.3080.407.2029.615.541.465.380.794.210.842.550.352.340.3725.35170.33153.5116.829.139.000.81
    P19-32
    REE1
    安山岩24.4166.326.2327.905.391.625.390.784.160.832.280.302.010.2920.26147.90131.8716.038.238.730.91
    D3560
    GS1
    流纹岩17.6226.123.6813.152.480.391.820.240.950.160.480.070.480.086.3567.7263.464.2614.8826.500.54
    D-D7015
    GS1
    凝灰岩27.1269.795.1818.513.260.722.630.461.340.380.780.240.750.258.30131.42124.596.8318.2525.790.73
    D4012
    GS1
    安山岩31.7470.587.9534.507.001.626.351.135.261.263.040.562.600.5232.00174.10153.3820.717.418.760.73
    P35-35
    GS1
    流纹岩23.9245.185.5120.544.010.652.970.391.490.300.710.130.810.128.75106.7299.806.9114.4421.120.55
    下载: 导出CSV

    表 3  牦牛山组火山岩微量元素分析数据

    Table 3.  Trace element compositions of the volcanic rocks in Maoniushan Formation

    10-6
    样品编号岩性AsBaBiCoCuGaHfMoNbNiPbRbSbSrTaThTiUVZnZr
    P3-16 REE1粗面英安岩299845.67.717.682462412.745.293.02514.354.53623.35250.15.4838.031.37924.866726.58711.3732.32178.6
    P3-21 REE1流纹岩448446.77.0210.98387.6513.235.560.8213.644.177.61210.755.7431.291.2419.286093.643.309.36170.2
    P5-3 REE1流纹岩33.0715.82.998.19131.612.376.160.3258.3132.8285.486151.93.2040.860.88415.5716443.22910.987.494204.2
    P10-3 REE1英安质晶屑凝灰岩20.3476.644.18.37774.3517.858.060.86811.353.33218.6130.123.364.610.87813.7531923.04515.8527.65262.2
    P10-5 REE1安山玻质岩2.2939.673.319.54521.6118.325.050.15711.363.676.63430.921.8024.80.9287.81548141.46530.4112.94163
    P12-11 REE1粗面安山岩6.45333.92.4622.7517.8417.664.20.4097.956446.39762.11.51252.70.6185.61562721.437118.666.46152.2
    P12-12 REE1杏仁状流纹岩3.14499.13.176.22318.7218.416.610.5217.4513.29133.67158.12.8139.340.72715.4922033.891866.1211.6
    YP07(3) REE1碳酸盐化流纹岩27.8478.10.287.051.84214.737.521.4068.6252.093178.1100.19.0140.290.47214.5413473.2566.845329.4250.8
    D3450 REE1流纹岩1.13646.50.167.563.8115.489.010.3210.381.3340.78128.650.6992.430.7412.2210741.782.34119.70312.8
    P16-60 REE1流纹岩3.15640.90.278.5371.90314.264.560.5525.73112.314.42159.10.9365.680.65412.6421213.17733.2541.25150.1
    P19-6 REE1流纹岩3.97424.10.327.1834.97213.774.360.45911.275.7426.38139.90.7564.840.92218.917143.8197.66925.96131.4
    P19-30 REE1流纹岩9.5410580.485.9847.29914.415.052.4449.8167.84629.43207.40.7184.250.74811.8824203.39144.6632.46176.5
    P19-32 REE1安山岩2.60582.10.0720.0418.1218.74.891.15212.1217.1914.5266.380.55355.50.6316.92966881.458138.888.92177.9
    D3560GS1流纹岩58413.42.5112.8516.45.6130.6228.91.3110.82.0015.2389.4
    D-D7015GS1凝灰岩7532.934.1113.11148.85258.91.1612.33.077.1674.77131
    D4012GS1安山岩39816.76.619.733.1763.15246.50.7710.22.3576.274.2253
    P35-35GS1流纹岩51711.23.3410.81.01145.47183.91.089.082.843.1247.77599.5
    下载: 导出CSV

    表 4  牦牛山组火山岩LA-ICP-MS 锆石U-Th-Pb 年龄测定结果

    Table 4.  LA-ICP-MS U-Th-Pb ages of zircons from the volcanic rocks in Maoniushan Formation

    测点Pb
    /10-6
    Th
    /10-6
    U
    /10-6
    Th/U207Pb
    /235U
    206Pb
    /238U
    206Pb/238U
    年龄/Ma
    谐和
    度/%
    YP07(3)TW1流纹岩
    01261854240.450.4470.0100.0610.0013808-1.32
    02141052330.460.4450.0110.0590.00137280.54
    03211623870.420.5810.0160.0550.001338914.20
    04151212500.480.4100.0150.0580.00137311-4.38
    05-2345390.450.0110.0550.0010.00134389.33
    06122141981.090.4560.0160.0590.00137192.96
    078631400.440.4820.0140.0600.00137983.09
    08302035020.420.4500.0190.0590.00137192.16
    09211533520.450.4570.0160.0590.00137192.96
    1091011580.660.4470.0210.0600.0013769-0.27
    11161172650.440.4730.0100.0610.00138083.42
    12221683660.470.4420.0110.0600.0013739-0.27
    13202733290.830.4530.0190.0600.00137790.80
    14231703960.430.5000.0130.0580.001363813.22
    159721560.460.4410.0140.0590.00137190.00
    1611811850.440.4770.0140.0600.00137396.17
    17181342980.450.5690.0130.0610.00137597.20
    18191723660.470.5790.0190.0510.001317810.73
    19231743950.440.4300.0160.0590.00137111-2.16
    20131992090.950.4840.0100.0600.00137893.62
    21201453380.430.4900.0100.0590.001368810.05
    22272144560.470.4450.0110.0600.0013759-0.27
    23171332960.450.4440.0130.0580.00137382.47
    YP07(3)TW1流纹岩
    248591400.421.1151.0120.0600.0013759-0.27
    D3450TW1流纹岩
    01121171980.590.4740.0090.0630.00139260.51
    02353205520.580.5140.0100.0640.00139965.51
    03132031991.020.5050.0210.0630.00139275.87
    04121021860.550.5660.0180.0630.001393615.78
    05161372540.540.4710.0120.0630.00139260.00
    06221983540.560.4780.0130.0620.00139061.79
    07262324150.560.4850.0090.0630.00139262.30
    08253463890.890.4730.0080.0630.0013956-0.51
    09222023550.570.6650.0140.0630.001396630.81
    10201572750.571.1330.0260.0720.001445772.81
    11242243860.580.4720.0090.0630.00139260.26
    12192532660.950.6410.0120.0720.001446612.78
    13322705000.540.4730.0090.0630.00139360.00
    14162334230.550.2850.0060.0380.00124234.96
    15161422590.550.4670.0130.0620.00139160.78
    16232113630.580.4870.0090.0630.00139362.54
    17242063750.550.4700.0100.0630.0013926-0.26
    18101261590.790.6200.0150.0620.001389626.29
    19131122030.550.5550.0100.0640.001399612.28
    20121021890.540.4770.0100.0630.00139360.76
    下载: 导出CSV
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出版历程
收稿日期:  2016-03-09
修回日期:  2016-07-11
刊出日期:  2017-03-25

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