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东昆仑希望沟橄榄辉石岩LA-ICP-MS锆石U-Pb定年及岩石地球化学特征

孔会磊 栗亚芝 李金超 贾群子 国显正 张斌

孔会磊, 栗亚芝, 李金超, 等, 2019. 东昆仑希望沟橄榄辉石岩LA-ICP-MS锆石U-Pb定年及岩石地球化学特征. 地质力学学报, 25 (3): 440-452. DOI: 10.12090/j.issn.1006-6616.2019.25.03.041
引用本文: 孔会磊, 栗亚芝, 李金超, 等, 2019. 东昆仑希望沟橄榄辉石岩LA-ICP-MS锆石U-Pb定年及岩石地球化学特征. 地质力学学报, 25 (3): 440-452. DOI: 10.12090/j.issn.1006-6616.2019.25.03.041
KONG Huilei, LI Yazhi, LI Jinchao, et al., 2019. LA-ICP-MS ZIRCON U-PB DATING AND GEOCHEMICAL CHARACTERISTICS OF THE XIWANGGOU OLIVINE PYROXENOLITE IN EAST KUNLUN. Journal of Geomechanics, 25 (3): 440-452. DOI: 10.12090/j.issn.1006-6616.2019.25.03.041
Citation: KONG Huilei, LI Yazhi, LI Jinchao, et al., 2019. LA-ICP-MS ZIRCON U-PB DATING AND GEOCHEMICAL CHARACTERISTICS OF THE XIWANGGOU OLIVINE PYROXENOLITE IN EAST KUNLUN. Journal of Geomechanics, 25 (3): 440-452. DOI: 10.12090/j.issn.1006-6616.2019.25.03.041

东昆仑希望沟橄榄辉石岩LA-ICP-MS锆石U-Pb定年及岩石地球化学特征

doi: 10.12090/j.issn.1006-6616.2019.25.03.041
基金项目: 

中国地质调查局地质调查项目 DD20160013

中国地质调查局地质调查项目 12120115022101

中国地质调查局地质调查项目 12120113029000

详细信息
    作者简介:

    孔会磊(1985-), 男, 硕士, 工程师, 主要从事区域岩浆作用及成矿规律研究。E-mail:konghuilei2008@126.com

  • 中图分类号: P588.1;P597.3

LA-ICP-MS ZIRCON U-PB DATING AND GEOCHEMICAL CHARACTERISTICS OF THE XIWANGGOU OLIVINE PYROXENOLITE IN EAST KUNLUN

  • 摘要: 东昆仑古特提斯域镁铁-超镁铁质岩石的研究极为薄弱,对青海东昆仑东段希望沟镁铁-超镁铁质杂岩体中橄榄辉石岩进行岩相学、地球化学及年代学分析,以期为东昆仑晚古生代-早中生代构造岩浆演化提供新的约束。利用LA-ICP-MS锆石U-Pb定年,获得希望沟橄榄辉石岩加权平均年龄为(262.4±1.6)Ma,表明岩体侵位于中二叠世。岩石地球化学研究显示,希望沟橄榄辉石岩具有较高的Mg#值(85.31~86.27),m/f比值介于5.50~6.18,属于铁质超基性岩类;具有低TiO2(0.41%~0.52%)和低Al2O3(3.04%~4.57%),属钙碱性系列。岩石富集大离子亲石元素(Rb、Th、U)和Pb,相对亏损高场强元素(Nb、Ta、P、Ti),ΣREE为29.79×10-6~38.96×10-6,(La/Yb)N为1.71~2.51,平均2.15,δEu=0.73~0.86,具有弱的Eu负异常。岩石成因分析表明,岩石源区为被俯冲改造的岩石圈地幔,岩浆在演化过程中遭受了上地壳物质的同化混染作用。结合东昆仑区域构造演化,认为希望沟橄榄辉石岩为阿尼玛卿古特提斯洋俯冲阶段的岩浆记录。

     

  • 图  1  希望沟—哈陇休玛一带镁铁-超镁铁岩地质略图

    1—第四系;2—上三叠统鄂拉山组火山岩;3—古元古界白沙河组变质岩系;4—早侏罗世正长花岗岩;5—晚三叠世二长花岗岩;6—二叠纪石英闪长岩;7—二叠纪花岗闪长岩;8—二叠纪二长花岗岩;9—晚奥陶世石英闪长岩;10—辉长岩;11—橄榄岩;12—橄榄辉长岩;13—橄榄辉石岩;14—地质界线;15—不整合界线;16—性质不明断层;17—逆断层;18—采样位置;①—柴达木北缘断裂;②—哇洪山-温泉断裂;③—东昆北断裂;④—东昆中断裂;⑤—东昆南断裂

    Figure  1.  The sketch geological map of the mafic-ultramafic intrusions in Xiwanggou-Halongxiuma area

    图  2  希望沟橄榄辉石岩的野外露头及显微照片

    Pl—斜长石;Opx—斜方辉石;Cpx—单斜辉石;Ol—橄榄石;Hbl—角闪石
    a—含长橄榄辉石岩野外露头;b—辉石被褐色角闪石交代(正交偏光);c—橄榄石常呈网环状结构(正交偏光);d—斜长石多呈填隙状产出(正交偏光)

    Figure  2.  Outcrop photos and microphotograghs of the Xiwanggou olivine pyroxenolite

    图  3  希望沟橄榄辉石岩锆石阴极发光照片

    Figure  3.  CL images of zircons from Xiwanggou olivine pyroxenolite

    图  4  希望沟橄榄辉石岩锆石U-Pb年龄谐和图和加权平均年龄图

    Figure  4.  Zircon U-Pb concordia diagram and weighted mean ages diagram from Xiwanggou olivine pyroxenolite

    图  5  希望沟橄榄辉石岩的SiO2-(Na2O+K2O)和SiO2-TFeO/MgO图解(a底图据文献[23];b底图据文献[24])

    Figure  5.  SiO2-(Na2O+K2O) and SiO2-TFeO/MgO plots for Xiwanggou olivine pyroxenolite (a is after reference[23]; b is after reference [24])

    图  6  希望沟橄榄辉石岩的微量元素原始地幔标准化蛛网图及稀土元素球粒陨石标准化配分曲线图(标准化数值据文献[25])

    Figure  6.  Primitive mantle-normalized trace element patterns and chondrite-normalized REE patterns for Xiwanggou olivine pyroxenolite (Normalized data are from reference [25])

    图  7  希望沟橄榄辉石岩源区性质与地壳混染判别图解(a底图据文献[29];b底图据文献[31])

    N-MORB—正常的大洋中脊玄武岩;E-MORB—富集的大洋中脊玄武岩;OIB—洋岛玄武岩

    Figure  7.  Discrimination diagram of the source characteristics and crustal contamination for Xiwanggou olivine pyroxenolite

    图  8  希望沟橄榄辉石岩构造环境判别图解(a底图据文献[33];b、c底图据文献[34];d底图据文献[22])

    Figure  8.  Tectonic discrimination diagrams for Xiwanggou olivine pyroxenolite

    表  1  希望沟橄榄辉石岩锆石LA-ICP-MS测年结果

    Table  1.   LA-ICP-MS isotopic data of zircon from Xiwanggou olivine pyroxenolite

    样品编号 含量/(×10-6) Th/U 207Pb/206Pb 207Pb/235U 206Pb/238U 207Pb/206Pb 207Pb/235U 206Pb/238U
    Th U 比值 1σ 比值 1σ 比值 1σ 年龄/Ma 1σ 年龄/Ma 1σ 年龄/Ma 1σ
    1 325 298 1.09 0.0524 0.0010 0.2973 0.0057 0.0412 0.0005 300.8 43.2 260.2 3.1 264.3 4.5
    2 301 361 0.83 0.0511 0.0009 0.2864 0.0051 0.0407 0.0005 243.7 40.6 257.0 3.0 255.7 4.0
    3 382 555 0.69 0.0513 0.0008 0.3002 0.0046 0.0425 0.0005 253.3 33.8 268.1 3.0 266.6 3.6
    4 210 128 1.64 0.0513 0.0014 0.2880 0.0077 0.0407 0.0005 254.5 61.5 257.3 3.3 257.0 6.1
    5 587 569 1.03 0.0517 0.0008 0.2919 0.0046 0.0410 0.0005 271.5 35.2 258.8 2.9 260.1 3.6
    6 635 467 1.36 0.0512 0.0008 0.2993 0.0046 0.0424 0.0005 248.1 34.6 267.8 3.0 265.8 3.6
    7 346 371 0.93 0.0516 0.0009 0.2902 0.0051 0.0408 0.0005 269.1 39.8 257.6 3.0 258.7 4.0
    8 323 335 0.96 0.0518 0.0010 0.2892 0.0057 0.0405 0.0005 274.3 44.6 256.2 3.0 257.9 4.5
    9 247 214 1.15 0.0522 0.0013 0.2935 0.0069 0.0408 0.0005 295.3 53.7 257.6 3.2 261.3 5.4
    10 350 259 1.35 0.0522 0.0011 0.2937 0.0059 0.0408 0.0005 292.4 46.0 258.0 3.1 261.4 4.7
    11 534 620 0.86 0.0526 0.0008 0.2982 0.0046 0.0411 0.0005 312.6 34.6 259.6 2.9 265.0 3.6
    12 243 263 0.92 0.0528 0.0010 0.3037 0.0057 0.0417 0.0005 320.2 42.5 263.4 3.1 269.3 4.5
    13 530 360 1.47 0.0530 0.0009 0.3059 0.0051 0.0418 0.0005 330.2 37.3 264.2 3.0 271.0 4.0
    14 194 158 1.23 0.0506 0.0012 0.2942 0.0066 0.0422 0.0005 220.3 51.8 266.5 3.3 261.8 5.2
    15 777 529 1.47 0.0515 0.0009 0.2907 0.0049 0.0409 0.0005 263.6 38.4 258.6 2.9 259.1 3.9
    16 298 320 0.93 0.0508 0.0010 0.2882 0.0053 0.0412 0.0005 229.5 42.5 260.1 3.0 257.1 4.2
    17 354 275 1.29 0.0535 0.0011 0.3023 0.0059 0.0410 0.0005 348.7 44.3 259.1 3.0 268.2 4.6
    18 302 271 1.11 0.0513 0.0010 0.3013 0.0056 0.0426 0.0005 254.2 42.8 268.9 3.1 267.4 4.4
    19 566 709 0.80 0.0478 0.0034 0.2759 0.0197 0.0419 0.0010 88.6 160.0 247.4 15.7 264.8 6.4
    20 935 536 1.74 0.0470 0.0039 0.2624 0.0222 0.0406 0.0010 47.9 189.2 236.6 17.9 256.4 6.2
    21 2415 1602 1.51 0.0530 0.0052 0.3101 0.0306 0.0425 0.0011 328.3 207.9 274.2 23.7 268.3 6.5
    22 226 484 0.47 0.0498 0.0043 0.2853 0.0246 0.0416 0.0010 186.3 187.5 254.8 19.4 262.7 6.3
    23 701 654 1.07 0.0475 0.0039 0.2768 0.0227 0.0424 0.0010 71.6 182.9 248.1 18.0 267.4 6.4
    24 579 761 0.76 0.0502 0.0035 0.2807 0.0197 0.0406 0.0010 203.1 152.9 251.2 15.6 256.8 6.2
    25 4058 11366 0.36 0.0497 0.0013 0.2929 0.0086 0.0428 0.0010 180.4 61.7 260.8 6.8 270.2 6.4
    26 494 561 0.88 0.0491 0.0037 0.2866 0.0219 0.0424 0.0010 154.2 168.0 255.9 17.3 267.5 6.4
    27 749 748 1.00 0.0493 0.0039 0.2747 0.0217 0.0405 0.0010 160.5 173.3 246.4 17.3 255.9 6.1
    28 2131 1408 1.51 0.0494 0.0030 0.2725 0.0166 0.0401 0.0010 167.8 134.2 244.7 13.3 253.1 6.0
    29 3557 2087 1.70 0.0513 0.0025 0.2991 0.0151 0.0423 0.0010 254.1 108.9 265.7 11.8 267.3 6.4
    30 1459 1223 1.19 0.0500 0.0028 0.2794 0.0159 0.0406 0.0010 195.2 125.0 250.2 12.7 256.4 6.1
    31 1997 1553 1.29 0.0493 0.0025 0.2734 0.0142 0.0403 0.0010 159.9 114.1 245.4 11.3 254.7 6.1
    32 708 842 0.84 0.0528 0.0042 0.3045 0.0247 0.0419 0.0010 318.0 172.6 269.9 19.2 264.7 6.4
    33 518 594 0.87 0.0520 0.0054 0.2891 0.0300 0.0404 0.0010 286.5 220.0 257.9 23.7 255.0 6.2
    34 592 732 0.81 0.0489 0.0043 0.2822 0.0252 0.0419 0.0010 144.5 195.4 252.4 19.9 264.4 6.4
    35 337 769 0.44 0.0523 0.0034 0.3043 0.0201 0.0422 0.0010 299.4 141.5 269.8 15.6 266.6 6.4
    36 792 927 0.85 0.0492 0.0053 0.2844 0.0306 0.0420 0.0010 157.6 233.0 254.2 24.2 265.0 6.4
    37 913 781 1.17 0.0481 0.0034 0.2681 0.0192 0.0404 0.0010 105.8 159.0 241.1 15.4 255.5 6.1
    下载: 导出CSV

    表  2  希望沟橄榄辉石岩主量元素(%)和微量元素含量(×10-6)

    Table  2.   Contents of major elements(%)and trace elements(×10-6)of Xiwanggou olivine pyroxenolite

    样品号 15XWGH1 15XWGH2 15XWGH3 15XWGH4 15XWGH5 15XWGH6
    SiO2 47.44 47.13 46.84 47.39 46.90 47.15
    TiO2 0.51 0.50 0.41 0.52 0.44 0.48
    Al2O3 3.85 3.81 4.57 4.11 3.99 3.04
    Fe2O3 2.71 3.20 2.62 2.57 3.09 2.37
    FeO 4.62 4.46 4.96 4.79 4.58 5.11
    MnO 0.14 0.14 0.13 0.14 0.14 0.13
    MgO 23.16 23.67 24.17 23.36 24.44 25.29
    CaO 11.89 11.41 10.78 11.84 10.83 11.24
    Na2O 0.55 0.52 0.61 0.56 0.60 0.46
    K2O 0.23 0.21 0.22 0.22 0.23 0.23
    P2O5 0.04 0.04 0.04 0.05 0.04 0.04
    LOI 4.49 4.54 4.31 4.07 4.35 4.01
    Total 99.63 99.63 99.66 99.62 99.63 99.55
    Mg# 85.52 85.31 85.60 85.55 85.67 86.27
    m/f 5.79 5.70 5.84 5.81 5.87 6.18
    Sc 44.30 43.40 39.40 44.50 40.80 42.60
    V 112.00 107.00 91.80 112.00 96.20 109.00
    Cr 2140.00 2080.00 1850.00 2110.00 1960.00 2210.00
    Ni 302.00 331.00 249.00 314.00 368.00 378.00
    Co 71.20 76.40 74.10 72.80 82.50 73.90
    Cu 87.50 89.30 23.70 84.70 72.90 243.00
    Zn 49.80 47.80 49.90 49.90 53.80 54.10
    Rb 10.10 8.44 8.48 8.30 8.48 8.27
    Ba 37.50 41.60 51.10 43.40 41.00 37.90
    Th 1.30 0.84 0.77 0.74 1.26 1.60
    U 0.43 0.38 0.30 0.35 0.44 0.42
    Ta 0.10 0.08 0.08 0.09 0.11 0.10
    Nb 1.23 1.15 0.95 1.19 1.43 1.32
    Pb 6.86 3.59 3.86 7.47 4.84 22.50
    Sr 69.30 71.80 116.00 80.40 80.20 56.30
    Zr 38.80 37.00 31.70 35.60 43.90 41.60
    Hf 1.26 1.11 0.97 1.16 1.16 1.21
    Y 13.30 12.50 10.40 13.00 10.80 12.60
    La 4.12 3.25 3.12 3.73 3.78 4.41
    Ce 11.90 9.69 8.85 10.50 9.94 12.50
    Pr 1.77 1.51 1.39 1.66 1.45 1.78
    Nd 8.26 7.35 6.59 7.90 6.77 8.16
    Sm 2.10 2.03 1.78 2.06 1.70 2.20
    Eu 0.62 0.56 0.49 0.64 0.52 0.57
    Gd 2.50 2.36 2.02 2.50 2.06 2.60
    Tb 0.43 0.41 0.34 0.43 0.36 0.43
    Dy 2.73 2.56 2.16 2.66 2.26 2.70
    Ho 0.56 0.54 0.44 0.54 0.46 0.54
    Er 1.53 1.46 1.19 1.46 1.22 1.42
    Tm 0.22 0.22 0.17 0.21 0.18 0.21
    Yb 1.40 1.36 1.09 1.30 1.11 1.26
    Lu 0.20 0.20 0.16 0.18 0.16 0.18
    ΣREE 38.34 33.50 29.79 35.77 31.97 38.96
    LREE/HREE 3.01 2.68 2.94 2.85 3.09 3.17
    (La/Sm)N 1.27 1.03 1.13 1.17 1.44 1.29
    (Gd/Yb)N 1.48 1.44 1.53 1.59 1.54 1.71
    (La/Yb)N 2.11 1.71 2.05 2.06 2.44 2.51
    δEu 0.83 0.78 0.79 0.86 0.85 0.73
    注:Mg#=100×w(Mg2+)/w(Mg2++Fe2+), m/f=w(Mg2++Ni2+)/w(Fe3++Fe2++Mn2+)
    下载: 导出CSV
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  • 收稿日期:  2018-05-09
  • 修回日期:  2018-08-27
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