新疆西准噶尔业姆奇花岗岩体形成时代及其构造意义

温志刚, 王洪强, 杜尧, 刘松柏, 王嘉伟. 新疆西准噶尔业姆奇花岗岩体形成时代及其构造意义[J]. 地质通报, 2019, 38(8): 1297-1305.
引用本文: 温志刚, 王洪强, 杜尧, 刘松柏, 王嘉伟. 新疆西准噶尔业姆奇花岗岩体形成时代及其构造意义[J]. 地质通报, 2019, 38(8): 1297-1305.
WEN Zhigang, WANG Hongqiang, DU Yao, LIU Songbai, WANG Jiawei. The formation age and tectonic significance of Yemuqi granite in West Junggar, Xinjiang[J]. Geological Bulletin of China, 2019, 38(8): 1297-1305.
Citation: WEN Zhigang, WANG Hongqiang, DU Yao, LIU Songbai, WANG Jiawei. The formation age and tectonic significance of Yemuqi granite in West Junggar, Xinjiang[J]. Geological Bulletin of China, 2019, 38(8): 1297-1305.

新疆西准噶尔业姆奇花岗岩体形成时代及其构造意义

  • 基金项目:
    中国地质调查局项目《新疆1:25万捷尔任斯克幅、托里县幅区调修测》(编号:1212010911056)和《新疆1:5万老裕民等七幅区调》(编号:1212011120507)
详细信息
    作者简介: 温志刚(1984-), 男, 硕士, 高级工程师, 从事区域地质调查工作。E-mail:wenzhigang2006@163.com
  • 中图分类号: P588.12+1;P534.41

The formation age and tectonic significance of Yemuqi granite in West Junggar, Xinjiang

  • 对新疆西准噶尔南部地区与早古生代蛇绿岩紧密伴生的业姆奇花岗岩体岩石学、岩石地球化学、同位素年代学进行研究,认为业姆奇花岗岩为低钾(拉斑)系列,岩石地球化学特征具板内靠近岛弧区域特征。通过对二长花岗岩LA-ICP-MS锆石U-Pb测年,获得比较准确的年龄数据539.7±2.6Ma,表明其形成时代为早寒武世,该侵入岩作为西准噶尔地区最老的岩浆活动产物,代表了在诺丁尼亚统一大陆形成之后早期裂解阶段古洋盆初期的地质记录。

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  • 图 1  新疆西准噶尔巴尔鲁克山一带地质简图

    Figure 1. 

    图 2  新疆西准噶尔业姆奇一带地质图

    Figure 2. 

    图 3  典型岩石镜下照片(正交偏光)

    Figure 3. 

    图 4  SiO2-K2O(a)[7-8]和SiO2-(K2O+NaO)(b)[9]岩石分类图解

    Figure 4. 

    图 5  业姆奇侵入体微量元素原始地幔蛛网图(a)和稀土元素球粒陨石配分型式图(b)[10]

    Figure 5. 

    图 6  二长花岗岩锆石阴极发光图像

    Figure 6. 

    图 7  二长花岗岩LA-ICP-MS锆石U-Pb谐和图(a)和206Pb/238U年龄加权平均值(b)

    Figure 7. 

    图 8  (Y+Nb)-Rb(a)和Yb-Ta图解(b)[14]

    Figure 8. 

    图 9  Rb/30-Hf-3*Ta(a)和Rb/10-Hf-3*Ta图解(b)

    Figure 9. 

    表 1  业姆奇侵入岩主量、微量和稀土元素分析结果

    Table 1.  Major, trace element and REE content of Yemuqi granite

    样号D0209/1D0209/2D0222/1D1013/1D3047/1D3047/6D3047/10D1333/1
    SiO256.171.7473.1766.4148.5966.957.562.31
    TiO20.450.230.20.370.680.350.570.45
    Al2O311.6913.4512.5714.7716.2813.6714.5115.52
    Fe2O38.453.072.484.5911.054.638.563.06
    FeO5.362.171.912.526.843.065.23.88
    MnO6.491.833.272.615.313.124.780.15
    MgO7.111.120.821.885.772.13.753.1
    CaO0.180.080.080.10.190.110.176.48
    Na2O0.150.070.090.160.320.180.244.35
    K2O0.51.460.651.380.520.710.620.56
    P2O53.514.794.755.24.455.154.120.17
    Pb2.93.522.6/0.94.54.3
    Co335.584.248.41/8.1619.524.3
    Ni43.6114.195.03/5.1713.114
    Cr23574.84.3/3.216.19.1
    Ga13.712.511.915.7/14.516.118
    Sc31.973.310.9/9.727.830.5
    Sr285255187203/284303544
    Ba255657297368/468521407
    Rb8.9813.813.117.4/10.711.77.2
    Cs0.540.460.80.87/0.770.980.79
    Nb2.752.9310.69.26/4.6411.63.49
    Ta0.250.220.450.86/0.460.390.24
    Zr26.433.336.421.4/22.813.211
    Hf2.22.382.311.68/1.821.311.06
    U1.721.061.161.62/1.771.231.25
    Th11.19.068.746.27/4.454.373.87
    Ti2491106711622005/203032193460
    La1434.430.223.115.7///
    Ce28.16553.846.238.1///
    Pr3.426.535.65.375.14///
    Nd14.422.419.621.323.4///
    Sm3.053.243.134.055.22///
    Eu0.960.890.841.151.49///
    Gd2.922.842.733.474.49///
    Tb0.420.290.30.460.61///
    Dy2.621.41.672.583.58///
    Ho0.510.280.330.520.69///
    Er1.560.871.081.562///
    Tm0.230.140.170.230.28///
    Yb1.470.981.121.591.82///
    Lu0.240.170.20.270.27///
    Y13.37.689.2813.416.5///
    ΣREE73.9139.43120.77111.85102.79///
    LREE/HREE6.411914.899.476.48///
    LaN/YbN6.8325.1819.3410.426.19///
    下载: 导出CSV

    表 2  业姆奇侵入岩样品(D0222-1) LA-ICP-MS锆石U-Th-Pb同位素分析结果

    Table 2.  LA-ICP-MS zircon U-Th-Pb composition of Yemuqi granite (D0222-1)

    测点含量/10-6同位素比值年龄/Ma
    PbThU207Pb/206U207Pb/235U206Pb/238U207Pb/206U206Pb/238U207Pb/235U
    14.6358.752.30.058610.00240.70790.02800.087600.0010555387541654317
    20.804.7512.00.057530.00090.69220.00920.087260.000525123553935346
    32.7349.243.60.059190.00130.71190.01350.087220.000615744553945468
    41.5520.522.20.05780.00110.69670.01120.087410.0005652241540.35377
    50.457.447.150.058460.00130.70410.01390.087330.000625474753945418
    60.642.736.190.058090.00100.69970.01010.087350.000535333853935396
    79.0442.847.70.058580.00140.70350.01470.087090.000645524953845419
    82.1925.830.00.060260.00110.72730.01190.087520.000576134054035557
    下载: 导出CSV
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出版历程
收稿日期:  2018-01-13
修回日期:  2018-04-04
刊出日期:  2019-08-15

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