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内蒙古狼山地区早石炭世石英闪长岩U-Pb年龄、地球化学特征及其对古亚洲洋俯冲的指示

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田健, 滕学建, 刘洋, 滕飞, 郭硕, 何鹏, 王文龙. 内蒙古狼山地区早石炭世石英闪长岩U-Pb年龄、地球化学特征及其对古亚洲洋俯冲的指示[J]. 地质通报, 2020, 39(7): 1035-1045.
引用本文: 田健, 滕学建, 刘洋, 滕飞, 郭硕, 何鹏, 王文龙. 内蒙古狼山地区早石炭世石英闪长岩U-Pb年龄、地球化学特征及其对古亚洲洋俯冲的指示[J]. 地质通报, 2020, 39(7): 1035-1045.
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TIAN Jian, TENG Xuejian, LIU Yang, TENG Fei, GUO Shuo, HE Peng, WANG Wenglong. U-Pb age and geochemical characteristics of quartz diorite in Early Carboniferous from Langshan area of Inner Mongolia, and its implication for subduction of Paleo-Asian Ocean[J]. Geological Bulletin of China, 2020, 39(7): 1035-1045.
Citation: TIAN Jian, TENG Xuejian, LIU Yang, TENG Fei, GUO Shuo, HE Peng, WANG Wenglong. U-Pb age and geochemical characteristics of quartz diorite in Early Carboniferous from Langshan area of Inner Mongolia, and its implication for subduction of Paleo-Asian Ocean[J]. Geological Bulletin of China, 2020, 39(7): 1035-1045.
shu

内蒙古狼山地区早石炭世石英闪长岩U-Pb年龄、地球化学特征及其对古亚洲洋俯冲的指示

  • 中国地质调查局天津地质调查中心, 天津 300170

  • 基金项目:
    中国地质调查局项目《阴山成矿带小狐狸山和雅布赖地区地质矿产调查》（编号：DD20160039）
详细信息
    作者简介: 田健(1987-), 男, 硕士, 工程师, 从事区域地质调查及岩浆岩岩石学研究。E-mail:243293305@qq.com

  • 中图分类号: P534.45;P597+.3

U-Pb age and geochemical characteristics of quartz diorite in Early Carboniferous from Langshan area of Inner Mongolia, and its implication for subduction of Paleo-Asian Ocean

  • Tianjin Center of China Geological Survey, Tianjin 300170, China

    摘要

  • 内蒙古狼山山脉西侧分布大面积的晚古生代岩浆岩，时代集中在早石炭世—晚二叠世，早石炭世石英闪长岩体出露于潮格温都尔镇西侧。该岩体岩性为石英闪长岩，LA-ICP-MS锆石U-Pb年龄显示，石英闪长岩的206Pb/238U年龄加权平均值为337.4±6.6 Ma。岩石暗色矿物以角闪石为主，黑云母次之，富铁，富钠，高钠钾比值，为钙碱性系列；富集大离子亲石元素Rb、K、Pb，不同程度的亏损高场强元素Nb、Ta、P、Ti的特点，稀土元素配分型式为轻稀土元素富集，重稀土元素亏损，弱的负Eu异常，总体反映岩浆弧的地球化学特征。构造环境判别图显示样品点落在大陆边缘弧范围，岩石地球化学特征表明狼山地区早石炭世处于大陆边缘弧构造背景，古亚洲洋石炭纪存在向南俯冲。对比北部造山带西乌旗地区的早石炭世石英闪长岩，两者地球化学特征基本相同。因此，早石炭世古亚洲洋发生了双向俯冲，形成了以石英闪长岩为主的岩石类型。

    The Late Paleozoic magmatites are distributed in the west of Inner Mongolian Langshan Mountain, with the formation concentrated in Early Carboniferous and Late Permian.The quartz diorite body of Early Carboniferous strata are outcropped in the west of Chaogewenduer Town.LA-ICP-MS zircon U-Pb age shows that the 206Pb/238U weighted average age of quartz diorite is 337.4±6.6 Ma.The characteristics of quartz diorite exhibit that the amphibole is the main dark mineral, characterized by enrichment in TFeO(TFeO=4.18%~6.95%) and Na2O (Na2O=3.11%~4.07%), high Na2O/K2O (Na2O/K2O 1.27~2.50), being calc alkaline series, enrichment in LILE (K, Rb, Ba), depletion in Nb, Ta, P and Ti, enrichment in LREE, and depletion in HREE as well as negligible Eu anomalies, which reflects the geochemical characteristics of magmatic arc.Th/Yb-Ta/Yb discriminant diagram shows the samples plot in the area of the continental margin arc.The geochemical characteristics of quartz diorite shows that the tectonic setting of Langshan area belonged to the continental margin arc in Early Carboniferous, the existence of the southward subduction of the paleo-Asian Ocean, and that, compared with the Early Carboniferous quartz diorite in Xiwuqi area of the northern orogenic belt, their geochemical characteristics are basically the same.Therefore, the paleo-Asian Ocean underwent bidirectional subduction in Early Carboniferous and formed the rock type dominated by quartz diorite.

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  • 图 1  测区大地构造位置(a)和地质简图(b)(据参考文献[19][①]修改)

    Figure 1. 

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    图 2  石英闪长岩野外露头照片及岩相学特征

    Figure 2. 

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    图 3  青灰色细粒石英闪长岩锆石阴极发光(CL)图像及年龄值(Ma)(a)和锆石U-Pb谐和图(b)

    Figure 3. 

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    图 4  侵入岩TAS图解[38] (a)和AFM图解[39] (b)

    Figure 4. 

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    图 5  石英闪长岩微量元素蛛网图(a)和稀土元素配分曲线(b)(标准化数据据参考文献[40])

    Figure 5. 

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    图 6  石英闪长岩La/Nb-La/Ba图解[41]

    Figure 6. 

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    图 7  石英闪长岩Y-Sr/Y判别图(a)[43]和Ta/Yb- Th/Yb图解(b)[44]

    Figure 7. 

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    图 8  华北地块北缘地质简图(据参考文献[45]修改)

    Figure 8. 

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    表 1  石英闪长岩锆石U-Th-Pb定年数据

    Table 1.  LA-ICP-MS zircon U-Th-Pb data for quartz biorite

    分析号 Pb U 232Th/238U 207Pb/206Pb比值 1σ 207Pb/235U比值 1σ 206Pb/238U比值 1σ 206Pb/238U年龄/Ma 1σ
    含量/10-6
    p17.22.2.1 143 2113 0.3843 0.0951 0.0018 0.8119 0.0192 0.0619 0.0007 387 4
    p17.22.2.2 81 1307 0.7755 0.0570 0.0007 0.4532 0.0065 0.0577 0.0006 362 4
    p17.22.2.3 61 863 0.4421 0.1082 0.0014 0.9201 0.0125 0.0617 0.0007 386 4
    p17.22.2.4 97 1088 0.5966 0.2065 0.0046 1.8161 0.0498 0.0638 0.0007 399 5
    p17.22.2.5 107 1494 0.4979 0.1304 0.0020 1.0525 0.0214 0.0585 0.0006 367 4
    p17.22.2.6 43 730 0.2528 0.0542 0.0007 0.4512 0.0064 0.0604 0.0006 378 4
    p17.22.2.7 111 1140 0.7122 0.1756 0.0026 1.6888 0.0259 0.0698 0.0007 435 4
    p17.22.2.8 19 348 0.2359 0.0657 0.0013 0.4991 0.0098 0.0551 0.0006 346 4
    p17.22.2.9 352 6519 0.1317 0.1152 0.0015 0.7746 0.0113 0.0488 0.0005 307 3
    p17.22.2.10 23 436 0.1736 0.0664 0.0012 0.4958 0.0090 0.0541 0.0005 340 3
    p17.22.2.11 60 994 0.5383 0.0654 0.0009 0.5067 0.0083 0.0562 0.0006 352 4
    p17.22.2.12 40 765 0.1878 0.0558 0.0007 0.4111 0.0060 0.0535 0.0005 336 3
    p17.22.2.13 483 3235 0.5315 0.3513 0.0042 3.7886 0.0527 0.0782 0.0008 486 5
    p17.22.2.14 42 681 0.2982 0.0855 0.0015 0.6624 0.0111 0.0562 0.0006 353 4
    p17.22.2.15 42 782 0.2557 0.0681 0.0009 0.4910 0.0071 0.0523 0.0005 329 3
    p17.22.2.16 61 934 0.5025 0.1010 0.0017 0.7602 0.0162 0.0546 0.0006 343 4
    p17.22.2.17 41 661 0.4798 0.0943 0.0026 0.6890 0.0181 0.0530 0.0005 333 3
    p17.22.2.18 63 1056 0.3903 0.0649 0.0009 0.5160 0.0092 0.0576 0.0006 361 4
    p17.22.2.19 190 944 0.5889 0.4358 0.0056 5.3796 0.0960 0.0895 0.0011 553 7
    p17.22.2.20 60 740 0.7560 0.1314 0.0019 1.1110 0.0206 0.0613 0.0007 384 4
    p17.22.2.21 168 2714 0.0784 0.0940 0.0012 0.7544 0.0113 0.0582 0.0006 365 4
    p17.22.2.22 37 568 0.5283 0.0925 0.0014 0.7154 0.0132 0.0561 0.0006 352 4
    p17.22.2.23 47 1141 0.8544 0.0731 0.0015 0.3502 0.0071 0.0348 0.0003 220 2
    p17.22.2.24 77 1330 0.2758 0.0704 0.0009 0.5421 0.0076 0.0558 0.0005 350 3
    下载: 导出CSV

    表 2  石英闪长岩主量、微量和稀土元素分析结果

    Table 2.  Result of whole-rock major, trace elements and REE of quartz biorite

    样品号 P17-25-1 P17-104-1 P17-116-1 P17-135-1 PM001-36-1 PM001-18-1 P17-22-1 P17-114-1 P17-129-1 P17-143-1
    SiO2 54.13 55.76 55.54 55.49 56.49 61.58 61.97 57.98 58.69 61.11
    TiO2 1.00 1.57 0.94 0.90 0.90 0.56 0.79 0.78 0.58 1.09
    Al2O3 17.37 17.06 18.29 16.84 17.41 15.92 16.92 17.01 17.47 17.72
    Fe2O3 1.02 0.88 0.77 0.87 0.04 0.21 0.32 0.61 1.18 0.54
    FeO 4.93 6.16 4.54 5.45 5.81 3.99 4.00 4.58 3.41 3.88
    MnO 0.11 0.12 0.096 0.11 0.11 0.08 0.069 0.094 0.084 0.079
    MgO 6.18 4.41 5.15 6.36 5.13 3.29 3.10 3.77 4.10 2.25
    CaO 8.44 6.48 7.50 6.53 7.61 4.67 4.50 6.29 6.32 4.98
    Na2O 3.12 3.43 3.30 3.11 3.13 3.50 3.61 3.38 3.44 4.07
    K2O 1.52 1.75 1.32 1.36 1.54 2.75 1.98 1.94 1.86 2.01
    P2O5 0.13 0.28 0.16 0.18 0.13 0.16 0.15 0.12 0.10 0.26
    H2O+ 1.31 1.25 1.46 1.88 0.95 1.28 1.69 1.90 1.70 1.36
    CO2 0.09 0.02 0.32 0.14 0.04 1.57 0.31 0.92 0.52 0.10
    烧失量 1.51 1.42 1.90 2.18 1.07 2.86 2.13 2.94 2.38 1.59
    总和 99.46 99.32 99.51 99.38 99.37 99.57 99.54 99.49 99.61 99.58
    TFeO 5.85 6.95 5.23 6.23 5.85 4.18 4.29 5.13 4.47 4.37
    Fe2O3 5.46 6.42 4.86 5.77 5.27 3.80 3.92 4.73 4.25 4.03
    Cs 3.34 2.24 2.95 2.82 3.77 3.38 2.98 2.82 3.71 2.33
    Rb 59.30 70.90 47.40 54.50 43.00 94.00 84.90 70.70 77.30 76.60
    Sr 332.00 558.00 629.00 540.00 560.00 479.00 406.00 523.00 475.00 484.00
    Ba 291.00 457.00 533.00 510.00 254.00 550.00 392.00 561.00 519.00 547.00
    Ga 17.00 17.20 16.70 18.20 18.70 19.90 17.80 17.50 17.20 19.70
    Nb 5.51 9.71 6.39 5.44 3.89 5.95 5.86 6.26 5.64 9.18
    Ta 0.50 0.76 0.45 0.43 0.36 0.70 0.25 0.59 0.50 0.73
    Zr 102.00 80.60 98.30 128.00 51.00 49.10 161.00 92.20 95.40 80.60
    Hf 3.18 2.52 3.06 3.70 1.68 1.96 4.33 2.90 2.92 2.55
    Th 5.10 3.84 3.34 5.25 3.69 4.21 8.04 6.22 6.03 5.15
    V 150.00 126.00 166.00 194.00 168.00 72.70 89.50 107.00 96.80 60.40
    Cr 203.00 66.00 105.00 126.00 80.20 87.60 89.60 43.70 57.50 20.90
    Co 24.70 23.90 18.40 23.60 23.30 13.30 14.40 16.00 14.90 11.40
    Ni 23.00 34.70 11.60 29.80 20.80 31.70 19.70 20.10 15.20 9.99
    Li 14.40 20.30 24.30 31.80 24.90 25.20 20.70 28.20 28.00 26.60
    Sc 26.20 21.70 23.90 26.80 21.80 13.20 15.10 19.90 18.60 13.10
    U 1.52 1.10 1.11 1.39 0.73 1.80 1.61 1.16 1.00 1.28
    Pb 9.59 9.24 8.05 8.70 10.70 17.20 11.9 14.2 10.8 12.3
    Zn 58.20 54.80 44.00 65.80 62.30 56.70 56.70 43.60 52.30 53.40
    Cu 18.80 25.10 16.50 46.40 21.90 19.70 15.70 16.30 12.80 12.60
    La 18.00 18.60 16.20 19.30 15.60 14.20 19.00 18.70 19.00 21.70
    Ce 49.40 56.80 44.30 49.00 30.80 25.30 40.30 45.40 42.70 50.20
    Pr 4.59 6.63 4.37 5.12 3.87 3.22 3.75 4.18 3.98 5.12
    Nd 17.70 31.10 18.00 21.50 14.90 12.30 13.00 15.80 15.00 20.90
    Sm 4.00 7.26 3.93 4.78 2.97 2.70 2.64 3.22 3.00 4.37
    Eu 1.20 1.91 1.39 1.44 1.29 1.06 0.99 1.10 1.19 1.34
    Gd 3.92 7.98 3.78 4.52 2.91 2.68 2.63 3.03 2.79 4.01
    Tb 0.66 1.20 0.61 0.74 0.49 0.45 0.42 0.49 0.44 0.62
    Dy 4.04 6.92 3.67 4.44 2.80 2.72 2.30 2.91 2.60 3.65
    Ho 0.82 1.38 0.72 0.90 0.58 0.52 0.46 0.59 0.52 0.71
    Er 2.22 3.62 1.96 2.38 1.51 1.42 1.29 1.57 1.43 1.86
    Tm 0.32 0.49 0.27 0.34 0.23 0.23 0.19 0.24 0.21 0.25
    Yb 2.10 2.87 1.81 2.24 1.52 1.48 1.25 1.58 1.36 1.53
    Lu 0.32 0.42 0.27 0.32 0.24 0.24 0.21 0.24 0.20 0.23
    Y 19.90 32.60 17.40 21.20 14.00 13.20 11.60 14.50 12.70 17.10
    ΣREE 129.19 179.78 118.68 138.22 93.71 81.72 100.03 113.55 107.12 133.59
    LREE 94.89 122.30 88.19 101.14 69.43 58.78 79.68 88.40 84.87 103.63
    HREE 34.30 57.48 30.49 37.08 24.28 22.94 20.35 25.15 22.25 29.96
    LREE/HREE 2.77 2.13 2.89 2.73 2.86 2.56 3.92 3.51 3.81 3.46
    注：主量元素含量单位为%，微量和稀土元素含量单位为10-6
    下载: 导出CSV
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    ①

    天津地质调查中心.区域地质矿产调查报告（查干呼舒庙等六幅 ）.2016.

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