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大兴安岭嘎仙蛇绿混杂岩中超镁铁质岩地球化学、年代学特征及其地质意义

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郑吉林, 刘涛, 徐立明, 梁中恺, 郭晓宇, 王大可, 孙靖尧. 大兴安岭嘎仙蛇绿混杂岩中超镁铁质岩地球化学、年代学特征及其地质意义[J]. 地质通报, 2020, 39(4): 480-490.
引用本文: 郑吉林, 刘涛, 徐立明, 梁中恺, 郭晓宇, 王大可, 孙靖尧. 大兴安岭嘎仙蛇绿混杂岩中超镁铁质岩地球化学、年代学特征及其地质意义[J]. 地质通报, 2020, 39(4): 480-490.
shu
ZHENG Jilin, LIU Tao, XU Liming, LIANG Zhongkai, GUO Xiaoyu, WANG Dake, SUN Jingyao. Geochemical and chronologic characteristics of ultramafic rocks in Gaxian ophiolitic mélange of the Da Hinggan Mountains and their geological significance[J]. Geological Bulletin of China, 2020, 39(4): 480-490.
Citation: ZHENG Jilin, LIU Tao, XU Liming, LIANG Zhongkai, GUO Xiaoyu, WANG Dake, SUN Jingyao. Geochemical and chronologic characteristics of ultramafic rocks in Gaxian ophiolitic mélange of the Da Hinggan Mountains and their geological significance[J]. Geological Bulletin of China, 2020, 39(4): 480-490.
shu

大兴安岭嘎仙蛇绿混杂岩中超镁铁质岩地球化学、年代学特征及其地质意义

  • 1.

    原中国人民武装警察部队黄金第三支队, 黑龙江 哈尔滨 150086

  • 2.

    原中国人民武装警察部队黄金第一总队, 黑龙江 哈尔滨 150086

  • 基金项目:
    中国地质调查局项目《黑龙江省大兴安岭鄂伦春自治旗、齐奇岭幅1：5万区域地质矿产调查》（编号：DD2016007807）和《太行山区山西段生态修复支撑调查》（编号：DD20208069）
详细信息
    作者简介: 郑吉林(1985-), 男, 硕士, 工程师, 从事区域地质调查工作。E-mail:123982315@qq.com

  • 中图分类号: P588.12+5;P597

Geochemical and chronologic characteristics of ultramafic rocks in Gaxian ophiolitic mélange of the Da Hinggan Mountains and their geological significance

  • 1.

    The ex-No.3 Gold Detachment of Chinese Armed Police Force, Harbin 150086, Heilongjiang, China

  • 2.

    The ex-No.1 Gold Brigade of Chinese Armed Police Force, Harbin 150086, Heilongjiang, China

    摘要

  • 嘎仙蛇绿混杂岩位于新林-嘎仙-吉峰蛇绿混杂岩带中段。岩石主要由镁铁-超镁铁质岩石组成，呈构造岩块的形式与变质细碎屑岩基质混杂产出。对超镁铁质岩系统的岩石学、地球化学和年代学研究结果表明，超镁铁质岩石SiO2含量平均值为44.87%，Mg#平均值为87.06，锆石U-Pb同位素年龄为649.6±4.2 Ma，时代为新元古代。稀土元素配分曲线总体呈平坦型，具有富集型洋脊玄武岩（E-MORB）向洋岛玄武岩（OIB）过渡的趋势。样品亏损Nb、Ta、Ti元素，相对富集Th、U、Zr、Hf元素，具有岛弧岩浆岩的特征。在Nb/Yb-Th/Yb构造环境判别图解中，样品点落入E-MORB和OIB交汇部位。通过与区域构造带岩石组合和地球化学特征对比，认为嘎仙超镁铁岩岩浆源区可能为受俯冲流体交代的富集地幔，属俯冲型（SSZ）蛇绿岩，其就位机制与持续洋内俯冲有关。

    The Gaxian ophiolitic melange belt is located in the middle of Xinlin-Gaxian-Jifeng ophiolitic melange belt.This ophiolite mainly consists of ultramafic and mafic rocks, mixed with metamorphic fine clastic rock matrix in the tectonic block form.This paper focuses on the systematic petrology, geochemistry and chronology of ultramafic rocks.The result shows that, in the ultramafic rock, the average value of SiO2 is 44.87%, the average value of Mg# is 87.06, and the zircon U-Pb age is 649.6±4.2 Ma, suggesting Neo-proterozoic.The curve of REE is of flat type, which shows MORB's transition to OIB.Geochemical data of the sample show depletion of Nb, Ta, Ti and enrichment of Th, U, Zr, Hf, exhibiting characteristics of the arc magma.In the Nb/Yb-Th/Yb tectonic environment discrimination diagram, it is located at the intersection of E-MORB and OIB.A comparison with the rock association of the regional tectonic and geochemical characteristics shows that the magma source area of the Gaxian ultramafic magma may be an enriched mantle replaced by subductive fluid, belonging to the SSZ type ophiolite, and its emplacement mechanism might have been related to the continuous intra-ocean subduction.

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  • 图 1  嘎仙蛇绿混杂岩分布区地质简图(图b据参考文献[2]修改)

    Figure 1. 

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    图 图版Ⅰ   

    Figure 图版Ⅰ. 

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    图 2  嘎仙超镁铁质岩部分锆石阴极发光(CL)图像

    Figure 2. 

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    图 3  嘎仙超镁铁质岩锆石U-Pb谐和图

    Figure 3. 

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    图 4  嘎仙超镁铁质岩TAS图解(a)和Nb/Y-Zr/TiO2岩石分类图解(b)(a、b底图据参考文献[11])

    Figure 4. 

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    图 5  嘎仙超镁铁质岩稀土元素球粒陨石标准化配分图(a)和微量元素原始地幔标准化蛛网图(b)

    Figure 5. 

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    图 6  嘎仙超镁铁质岩Sm-Sm/Yb相关图[24-25]

    Figure 6. 

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    图 7  嘎仙超镁铁质岩Hf/3-Th-Nb/16[29]与Y/15-La/10-Nb/8[30]构造环境判别图解

    Figure 7. 

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    图 8  嘎仙超镁铁质岩Nb/Yb-Th/Yb构造环境判别图解[31]

    Figure 8. 

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    表 1  嘎仙超镁铁质岩(WJE032)锆石U-Th-Pb同位素分析结果

    Table 1.  The zircon U-Th-Pb isotope analyses of Gaxian ultramafic rocks(WJE032)

    测点号 含量/10-6 Th/U 同位素比值 年龄/Ma
    Pb U Th 206Pb/238U ±1σ 207Pb/235U ±1σ 207Pb/206Pb ±1σ 206Pb/238U ±1σ 207Pb/235U ±1σ
    1 17 148 83 0.5564 0.1068 0.0011 0.9187 0.013 0.0624 0.0008 654 7 662 9
    2 22 170 173 1.0193 0.1071 0.0011 0.9159 0.0223 0.062 0.0016 656 7 660 16
    3 19 156 114 0.7287 0.1054 0.0011 0.8882 0.0144 0.0611 0.0009 646 7 645 10
    4 62 481 507 1.0539 0.1054 0.0011 0.8967 0.012 0.0617 0.0007 646 7 650 9
    5 33 285 152 0.5341 0.1067 0.0011 0.8974 0.0119 0.061 0.0007 654 7 650 9
    6 4 38 18 0.4618 0.105 0.0011 0.9108 0.0198 0.0629 0.0013 644 7 657 14
    7 10 88 58 0.6582 0.105 0.0011 0.9297 0.0166 0.0642 0.0011 643 7 667 12
    8 2 21 10 0.461 0.1078 0.0012 0.9395 0.0437 0.0632 0.0029 660 8 673 31
    9 8 61 67 1.102 0.1052 0.0011 0.915 0.0471 0.0631 0.0032 645 7 660 34
    11 14 120 77 0.6444 0.1062 0.0011 0.9249 0.0137 0.0632 0.0008 651 7 665 10
    12 13 106 81 0.7668 0.1066 0.0011 0.9246 0.0141 0.0629 0.0008 653 7 665 10
    13 10 212 171 0.4889 0.1054 0.0011 0.91 0.0208 0.0626 0.0014 646 6 657 15
    14 4 39 19 0.4356 0.1056 0.0011 0.8981 0.0118 0.0617 0.0007 647 6 651 9
    15 4 40 18 0.5169 0.1052 0.0011 0.9147 0.0266 0.063 0.0018 645 7 660 19
    16 25 225 98 0.6328 0.1042 0.0011 0.9139 0.031 0.0636 0.0021 639 7 659 22
    17 3 26 13 0.6353 0.1033 0.0011 0.8867 0.0493 0.0623 0.0034 634 7 645 36
    18 3 24 15 0.5307 0.1051 0.0011 0.8927 0.0137 0.0616 0.0008 644 7 648 10
    19 2 19 12 0.5976 0.1012 0.001 0.8907 0.0172 0.0638 0.0012 621 6 647 12
    20 17 154 82 0.3979 0.1067 0.0011 0.9143 0.0146 0.0622 0.0009 653 7 659 11
    21 14 128 76 0.5901 0.1004 0.0011 0.8836 0.0295 0.0639 0.002 617 7 643 21
    22 11 96 38 0.7213 0.1078 0.0011 0.9212 0.0133 0.062 0.0008 660 7 663 10
    23 6 57 31 0.528 0.1073 0.0011 0.9069 0.0126 0.0613 0.0008 657 7 655 9
    24 8 77 45 0.7996 0.1064 0.0011 0.908 0.0229 0.0619 0.0015 652 7 656 17
    25 17 145 105 0.3972 0.1068 0.0011 0.9249 0.0363 0.0628 0.0024 654 7 665 26
    26 26 232 123 0.6243 0.1065 0.0011 0.9028 0.0469 0.0615 0.0032 652 7 653 34
    27 10 87 73 0.5056 0.1084 0.0011 0.909 0.0133 0.0608 0.0008 664 7 657 10
    28 14 120 77 1.125 0.1077 0.0011 0.9173 0.0345 0.0618 0.0023 659 7 661 25
    29 13 106 81 1.4355 0.1241 0.0015 1.1738 0.0231 0.0686 0.0012 754 9 788 16
    30 10 212 171 0.6178 0.109 0.0011 0.9382 0.0129 0.0624 0.0008 667 7 672 9
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    表 2  嘎仙超镁铁质岩岩石地球化学特征

    Table 2.  Major, trace and rare earth element characteristics of Gaxian ultramafic rocks

    样品编号 WJE032 WJE059 WJE065 WJE070 WJE071
    名称 蛇纹石化橄榄岩 蛇纹石化橄榄辉石岩 蛇纹石化橄榄岩 蛇纹石化橄榄辉石岩 蛇纹石化橄榄辉石岩
    SiO2 43.80 45.47 45.44 44.64 45.01
    Al2O3 8.65 3.54 5.93 8.90 2.65
    TiO2 0.81 0.27 0.61 1.12 0.10
    Fe2O3 1.18 0.98 1.21 1.59 2.00
    FeO 8.90 8.11 6.41 7.66 5.80
    CaO 6.59 5.85 7.12 6.45 4.51
    MgO 23.21 30.47 26.97 26.37 34.19
    K2O 0.08 0.01 0.02 0.03 0.01
    Na2O 0.13 0.04 0.13 0.22 0.05
    MnO 0.18 0.13 0.19 0.18 0.10
    P2O5 0.12 0.05 0.10 0.16 0.16
    TFeO 9.96 9.00 7.50 9.10 7.61
    Mg# 83.0 87.7 88.3 85.9 90.4
    灼失量 6.00 4.55 5.48 2.22 4.85
    总和 99.67 99.47 99.61 99.53 99.45
    K2O/Na2O 0.62 0.16 0.12 0.12 0.23
    K2O+Na2O 0.22 0.05 0.15 0.24 0.06
    Y 19.0 9.30 8.44 19.6 5.72
    La 11.0 5.21 7.90 20.7 5.36
    Ce 23.3 13.0 14.9 42.2 9.31
    Pr 3.40 1.82 1.80 5.29 1.15
    Nd 15.4 7.77 6.83 21.0 4.66
    Sm 3.89 1.90 1.52 4.18 0.98
    Eu 0.90 0.31 0.51 0.95 0.32
    Gd 2.96 1.62 1.37 3.84 1.06
    Tb 0.57 0.30 0.25 0.66 0.19
    Dy 3.44 1.74 1.55 4.12 1.18
    Ho 0.65 0.32 0.29 0.78 0.22
    Er 1.78 0.91 0.84 2.29 0.58
    Tm 0.30 0.15 0.14 0.41 0.09
    Yb 1.75 0.90 0.84 2.67 0.56
    Lu 0.25 0.14 0.13 0.35 0.08
    Li 14.8 8.97 7.27 7.16 9.31
    Be 0.63 0.44 0.64 1.04 0.16
    Sc 26.6 17.6 22.4 23.8 14.0
    V 117 80.7 95.5 171 56.0
    Cr 1224 1542 1908 2152 2463
    Co 93.6 166 75.4 68.4 82.9
    Ni 1171 2897 1187 965 1330
    Cu 55.3 33.0 15.1 12.6 16.9
    Zn 73.8 58.6 58.0 76.9 61.8
    Ga 8.87 4.40 7.20 13.1 2.95
    Rb 8.42 1.60 6.80 6.39 2.4
    Sr 98.8 190 366 57.7 243
    Zr 76.6 27.0 55.8 105 8.6
    Nb 15.4 4.97 8.10 23.8 1.04
    Mo 1.27 0.44 0.10 1.16 0.23
    Cs 2.44 0.37 0.53 1.02 0.21
    Ba 24.2 6.52 41.7 39.9 61.6
    Hf 2.05 0.76 1.63 2.96 0.34
    Ta 0.78 0.28 0.38 1.77 0.10
    W 2.29 0.61 0.86 0.57 1.38
    Tl 0.19 0.03 0.05 0.03 0.04
    Pb 12.4 0.11 1.99 1.11 4.93
    Bi 0.13 0.15 0.13 0.14 0.08
    Th 2.74 0.95 0.97 2.39 0.39
    U 0.87 0.26 0.47 0.99 0.15
    Nb/Ta 19.7 18.0 21.4 13.4 10.8
    (La/Yb)N 4.53 4.16 6.71 5.58 6.85
    (La/Sm)N 1.84 1.77 3.36 3.21 3.54
    (Gd/ Yb)N' 1.40 1.50 1.34 1.19 1.56
    δEu 0.27 0.17 0.35 0.24 0.31
    δCe 3.81 4.22 3.95 4.03 3.75
    ΣREE 88.6 45.4 47.3 129.0 31.5
    注：σ=(Na2O+ K2O)2/(SiO2-43)(wt%)；TFeO=FeO+0.8998Fe2O3；Mg#={100× n(Mg2+)/[(n(Mg2+)+ n(Fe2+)]}；主量元素含量单位为%，微量和微土元素含量单位为10-6
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收稿日期:  2019-01-19
修回日期:  2019-02-27
刊出日期:  2020-04-15

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