祁连山哈拉湖地区奥陶纪岛弧火山岩及其构造意义

李五福, 张新远, 王春涛, 刘建栋, 乔国栋, 奎明娟, 李红刚, 赵忠国, 薛万文, 李善平. 祁连山哈拉湖地区奥陶纪岛弧火山岩及其构造意义[J]. 地质通报, 2019, 38(8): 1287-1296.
引用本文: 李五福, 张新远, 王春涛, 刘建栋, 乔国栋, 奎明娟, 李红刚, 赵忠国, 薛万文, 李善平. 祁连山哈拉湖地区奥陶纪岛弧火山岩及其构造意义[J]. 地质通报, 2019, 38(8): 1287-1296.
LI Wufu, ZHANG Xinyuan, WANG Chuntao, LIU Jiandong, QIAO Guodong, KUI Mingjuan, LI Honggang, ZHAO Zhongguo, XUE Wanwen, LI Shanping. Ordovician island arc volcanic rocks in Halahu area of Qilian Mountain and their tectonic significance[J]. Geological Bulletin of China, 2019, 38(8): 1287-1296.
Citation: LI Wufu, ZHANG Xinyuan, WANG Chuntao, LIU Jiandong, QIAO Guodong, KUI Mingjuan, LI Honggang, ZHAO Zhongguo, XUE Wanwen, LI Shanping. Ordovician island arc volcanic rocks in Halahu area of Qilian Mountain and their tectonic significance[J]. Geological Bulletin of China, 2019, 38(8): 1287-1296.

祁连山哈拉湖地区奥陶纪岛弧火山岩及其构造意义

  • 基金项目:
    中国地质调查局项目《青海省德令哈市哈拉湖地区J47E009006、J47E010005、J47E010006、J47E011005四幅1:5万区域地质矿产调查》(编号:12212011221151)、《青海区域地质调查片区总结与服务产品开发》(编号:12120114079701)和青海科技计划项目《柴北缘战略性新兴矿产找矿突破及关键技术示范》(编号:2018-SF-109)
详细信息
    作者简介: 李五福(1982-), 男, 硕士, 高级工程师, 从事区域地质调查研究。E-mail:15422504@qq.com
    通讯作者: 张新远(1988-), 男, 硕士, 工程师, 从事区域地质调查研究。E-mail:235299800@qq.com
  • 中图分类号: P534.42;P588.14

Ordovician island arc volcanic rocks in Halahu area of Qilian Mountain and their tectonic significance

More Information
  • 通过1:5万区域地质调查,对祁连山哈拉湖地区火山岩进行了野外地质、岩石学、锆石U-Pb同位素年龄、地球化学等研究。LA-ICP-MS锆石U-Pb同位素定年结果显示,该火山岩年龄为466.3±2.4Ma(n=9,MSWD=1.4),形成于中奥陶世。岩石地球化学研究表明,哈拉湖地区火山岩为低钾拉斑玄武系列,绝大多数样品的亲石元素Rb、Th、U、Ce、Zr、Nd和稀土元素La、Sm富集明显;高场强元素(Sr、P、Ti)强烈亏损,Zr、Hf微弱富集,Ba明显亏损。总的特征显示,少数火山岩具有过渡型洋脊玄武岩的特征,大多数火山岩样品显示岛弧火山岩的特征。此外,哈拉湖地区的岛弧火山岩与晚奥陶世的岛弧花岗岩伴生在一起。这些特征表明,与俯冲有关的奥陶纪岛弧岩石可能与拉脊山地区古大洋的闭合有关。

  • 加载中
  • 图 1  哈拉湖地区地质简图

    Figure 1. 

    图 2  哈拉湖火山岩TAS(a)[29]和Nb/Y-Zr/TiO2*0.0001图解(b)[30]

    Figure 2. 

    图 3  哈拉湖地区火山岩野外特征(a)和镜下照片(b)

    Figure 3. 

    图 4  哈拉湖火山岩SiO2-K2O图解(a)和AFM图解(b)

    Figure 4. 

    图 5  哈拉湖火山岩稀土元素配分图(a)和原始地幔标准化微量元素蛛网图(b)(底图据参考文献[15])

    Figure 5. 

    图 6  哈拉湖地区火山岩(IU-PbC1014)锆石U-Pb谐和图(a)和206Pb/238U表面年龄加权平均值图(b)

    Figure 6. 

    图 7  哈拉湖火山岩构造环境判别图解

    Figure 7. 

    表 1  哈拉湖地区火山岩地球化学分析结果

    Table 1.  Geochemical compositions of volcanic rocks in Halahu area

    样品号ⅠC1014-2ⅠC1014-3IC1014ⅠPm103/2-1ⅠPm103/16-1ⅠPm103/32-1ⅠPm103/32-2ⅠPm103/32-5
    岩性玄武岩玄武岩玄武岩玄武安山岩玄武安山岩安山岩安山岩安山岩
    SiO246.2445.7146.6150.4450.4547.7048.0048.89
    TiO20.380.400.580.830.900.660.780.53
    Al2O37.577.9712.3912.1912.2710.5111.7010.51
    Fe2O31.541.701.152.232.140.801.081.16
    FeO6.876.838.237.657.677.437.137.37
    MnO0.170.180.210.170.180.300.180.15
    MgO20.4520.5910.449.078.999.0710.1413.66
    CaO9.649.227.3410.0810.119.999.896.28
    Na2O0.490.490.172.102.340.892.070.19
    K2O0.190.180.421.591.430.040.330.03
    P2O50.140.140.170.170.230.200.160.18
    烧失量5.115.3711.112.402.2711.427.6510.25
    总量99.6699.6799.6899.7699.7499.7799.7499.75
    Mg#82.9583.0068.1665.4165.2567.5970.4975.65
    A/NK7.487.9616.882.362.276.973.1130.46
    A/CNK0.730.811.560.890.880.960.951.62
    La7.465.6010.5716.118.114.8011.0310.44
    Ce14.6913.2421.4432.136.529.1622.7921.15
    Pr2.102.062.754.135.143.773.072.76
    Nd9.449.1510.9116.821.615.7413.2511.74
    Sm2.112.192.493.624.713.393.072.61
    Eu0.590.610.490.9631.210.890.960.78
    Gd2.092.192.153.624.423.163.352.69
    Tb0.330.340.400.5860.7070.520.570.43
    Dy1.962.052.443.273.733.123.492.68
    Ho0.390.400.520.6800.7620.590.730.53
    Er1.141.131.461.852.091.702.101.50
    Tm0.190.180.240.2970.3150.260.320.24
    Yb1.181.131.512.002.041.472.021.43
    Lu0.180.170.230.3190.3000.210.270.20
    Sr59.1757.33145.4428449241.2272.6156.3
    Rb3.731.4814.5035.928.93.189.631.58
    Ba37.0926.84111.438044023.70104.236.40
    Th3.853.184.084.965.684.103.793.76
    Ta0.350.230.231.280.820.410.440.33
    Nb3.332.103.585.536.124.585.183.59
    Zr33.0332.4867.967.775.068.9171.6751.98
    Hf0.981.132.92.042.363.032.612.15
    Cr11771281331.8275279711.8831.6708.2
    V133.6135.7170.6273252170.3197.3187.0
    U0.830.781.071.031.241.091.110.81
    Y10.2710.3713.3317.4019.0914.9217.9313.55
    Sc24.524.8927.9138.241.226.2534.2839.33
    注:主量元素含量单位为%,微量、稀土元素含量单位为10-6
    下载: 导出CSV

    表 2  哈拉湖地区火山岩(IU-PbC1014)锆石U-Th-Pb同位素测定结果

    Table 2.  Zircon U-Th-Pb isotope analyses for volcanic rocks (IU-PbC1014) in Halahu area

    测试号PbU206Pb/238U207Pb/235U207Pb/206U208Pb/232U232Pb/238U年龄/Ma
    10-6206Pb/238U207Pb/235U
    1121620.075450.000410.581970.009200.055940.000870.030140.000230.252670.0007246934667
    2502420.184140.000941.925800.013670.075850.000520.061770.000140.618160.003251090610908
    3222570.073850.000490.578690.015870.056830.001300.036710.001260.593600.00911459346413
    4273040.029790.000210.419110.005970.102050.001340.018080.000140.378230.0006649836529
    5121500.080390.000420.900740.012930.081270.001110.036830.000400.377540.0008848035419
    6303480.079760.000420.905530.019190.082340.001650.036350.000670.365810.00102495365514
    7293380.078880.000410.806250.012340.074130.001080.031370.000360.406720.0007448936009
    8506510.075510.000420.585580.004300.056250.000440.032690.000250.277420.0009946934683
    9283330.075340.000400.585930.010310.056400.000950.025700.000110.652530.0004546824688
    10515830.079050.000410.844680.008680.077500.000800.030470.000180.517980.0005949036226
    1139990.370930.002086.413810.038740.125410.000730.117080.000390.282480.00033203411203412
    12151580.079480.000480.946010.019600.086330.001880.037080.000250.576470.00213493367614
    1310700.141350.000781.622550.052110.083250.002640.074230.001830.207320.00080852597931
    14757330.079660.000411.497180.009520.136320.000820.062440.000120.431480.0003749439296
    15182180.074440.000390.583080.009540.056810.000870.030290.000420.576970.0033346324668
    16546200.075140.000410.580080.010900.055990.001010.024160.000280.856230.0026446734659
    17904180.198380.001442.830620.021200.103490.000830.088910.001070.341910.0014411678136410
    18202520.074820.000400.581760.009530.056390.000920.023400.000110.507710.0004146524668
    19954770.186790.000992.651840.020960.102960.000890.070920.000220.329390.0043211046131510
    20341480.207610.001072.344580.016980.081910.000570.057870.000220.629720.003351216612269
    21668400.075410.000400.584010.003860.056170.000390.032840.000130.345660.0008046924673
    2292610.028930.000160.508010.008720.127370.002140.028380.000390.219480.0008118414177
    23435560.074860.000410.581230.004490.056310.000410.020480.000040.489870.0015346534654
    24704550.067040.000445.149050.044940.557030.003330.276980.001850.258720.000824183184416
    下载: 导出CSV
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出版历程
收稿日期:  2017-06-10
修回日期:  2017-09-19
刊出日期:  2019-08-15

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