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商丹洋早寒武世俯冲作用——来自甘肃关子镇蛇绿混杂岩古坡高镁安山岩的证据

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毕志伟, 吴纪修, 张亚光, 王晓赛, 王强, 刘腾飞, 王文. 商丹洋早寒武世俯冲作用——来自甘肃关子镇蛇绿混杂岩古坡高镁安山岩的证据[J]. 地质通报, 2022, 41(5): 740-753. doi: 10.12097/j.issn.1671-2552.2022.05.003
引用本文: 毕志伟, 吴纪修, 张亚光, 王晓赛, 王强, 刘腾飞, 王文. 商丹洋早寒武世俯冲作用——来自甘肃关子镇蛇绿混杂岩古坡高镁安山岩的证据[J]. 地质通报, 2022, 41(5): 740-753. doi: 10.12097/j.issn.1671-2552.2022.05.003
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BI Zhiwei, WU Jixiu, ZHANG Yaguang, WANG Xiaosai, WANG Qiang, LIU Tengfei, WANG Wen. Early Cambrian subduction of the Shangdan Ocean: New evidence from the Gupo high-Mg andesite in the Guanzi Town ophiolite mélanges, Gansu Province[J]. Geological Bulletin of China, 2022, 41(5): 740-753. doi: 10.12097/j.issn.1671-2552.2022.05.003
Citation: BI Zhiwei, WU Jixiu, ZHANG Yaguang, WANG Xiaosai, WANG Qiang, LIU Tengfei, WANG Wen. Early Cambrian subduction of the Shangdan Ocean: New evidence from the Gupo high-Mg andesite in the Guanzi Town ophiolite mélanges, Gansu Province[J]. Geological Bulletin of China, 2022, 41(5): 740-753. doi: 10.12097/j.issn.1671-2552.2022.05.003
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商丹洋早寒武世俯冲作用——来自甘肃关子镇蛇绿混杂岩古坡高镁安山岩的证据

  • 1.

    河北省区域地质调查院，河北 廊坊065000

  • 2.

    中国地质科学院勘探技术研究所，河北 廊坊065000

  • 3.

    中国地质大学(北京), 北京 100083

  • 基金项目:
    中国地质调查局项目《共和—略阳地区区域地质调查》(编号DD20190072)
详细信息
    作者简介: 毕志伟(1984-)，男，高级工程师，从事区域地质矿产调查工作。E-mail: 11196363@qq.com

  • 中图分类号: P534.41;P588.14+4

Early Cambrian subduction of the Shangdan Ocean: New evidence from the Gupo high-Mg andesite in the Guanzi Town ophiolite mélanges, Gansu Province

  • 1.

    Hebei Regional Geological Survey Institute, Langfang 065000, Hebei, China

  • 2.

    Institute of Exploration Techniques, CAGS, Langfang 065000, Hebei, China

  • 3.

    China University of Geosciences(Beijing), Beijing 100083, China

    摘要

  • 古坡一带新发现中寒武世高镁安山岩，位于秦岭造山带西段商丹缝合带关子镇蛇绿混杂岩中，其岩石组合为玄武安山岩、安山岩、辉石石英闪长岩等。这些岩石具有较高的SiO2(54.27%~58.47%)、MgO(6.89%~8.99%)含量和Mg#值(61.29~67.05)，较低的TiO2(0.27%~0.99%)含量和TFeO/MgO值(0.88~1.13)。稀土元素总量较低(16.59×10-6~74.5×10-6)，稀土元素配分曲线总体为平坦型或微右倾型，(La/Yb)N值为1.03~4.93，无明显Eu异常。岩石富集大离子亲石元素Cs、Rb、Ba、K、U等，亏损高场强元素Nb、Ta、Hf等，具有较低的Ti/V值。上述岩石地球化学特征与日本西南Setouchi岛弧火山岩带的sanukite(赞岐岩)类似，其岩浆可能为俯冲深积物熔融产生熔体与上覆地幔楔橄榄岩平衡反应成因。与古坡变质玄武安山岩密切共生的辉石石英闪长岩LA-ICP-MS锆石U-Pb年龄为514±4.5 Ma，为中寒武世。关子镇蛇绿混杂岩中古坡玄武安山岩/辉石石英闪长岩-安山岩岩石系列为形成于俯冲环境的高镁安山岩组合。研究结果为商丹洋在中寒武世俯冲作用提供了证据。

    The Gupo high-Mg andesite(HMA)is newly recognized in the Guanzi town ophiolite located in the Shangdan suture zone, Qinling Orogen.The Gupo high-Mg andestieis mainly composed of basaltic andesite, andesite, and pyroxene quartz diorite, which has relatively high contents of MgO(6.89%~8.99%), Mg#61.29~67.05), SiO2(54.27%~58.47%), and low contents of TiO2(0.27%~0.99%), K2O(0.09%~2.32%), Al2O3(12.09%~18.38%), and TFeO/MgO(0.88~1.13).The contents of REE are also low(16.59×10-6~74.5×10-6).The distribution pattern of REE is flat and slightly right type(LaN/YbN=1.03~4.93)without obvious abnormity of Eu.In addition, the rocks are enriched with large ion lithophile element such as Cs, Rb, Ba, K, and U, depleted of high field-strength element such as Nb, Ta, and Hf with low value of Ti/V.All these geochemical characteristics are identical to the typical high-Mg andesite, and are similar to the Sanukite from the Setouchi arc volcanic belt in the SW Japan.The subducted oceanic crust and the deep sediments may produce the aquiferous fluid from melted subducted oceanic crust and the deep sediments may react with the overlying mantle peridotite to form the metamorphic basalt-andesite.LA-ICP-MS U-Pb zircon date obtained from the gabbro-diorite coexisting with the Gupo metamorphic basaltic andesite indicates that the high-Mg andesitic magmatism event happened at 514±4.5 Ma.The Guanzi town high-Mg andesites was probably formed from the fore-arc tectonic environment because of the oceanic crust subducted in the Middle Cambrian.This study provides the evidence of the Shangdan oceanic subduction in the Middle Cambrian.

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  • 图 1  关子镇蛇绿混杂岩区域位置(a)及地质简图(b)

    Figure 1. 

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    图 2  变质玄武安山岩野外(a)及镜下(b)特征

    Figure 2. 

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    图 3  变质辉石石英闪长岩岩墙侵入变质玄武安山岩(a)及镜下照片(b)

    Figure 3. 

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    图 4  古坡变质辉石石英闪长岩(DF5)锆石阴极发光(CL)图像及U-Pb年龄

    Figure 4. 

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    图 5  古坡变质辉石石英闪长岩锆石U-Pb年龄直方图(a)和谐和图(b)

    Figure 5. 

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    图 6  变质玄武安山岩-安山岩岩石化学分类判别图解

    Figure 6. 

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    图 7  变质玄武安山岩-安山岩稀土元素球粒陨石标准化模式图(a)及微量元素NMORB标准化蛛网图(b)

    Figure 7. 

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    图 8  古坡高镁安山岩类型(赞岐岩、玻安岩、埃达克型高镁安山岩-巴哈岩)判别图[11]

    Figure 8. 

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    图 9  古坡高镁安山岩Nb/Y-Ba/Y(a)、Nb/Y-Rb/Y(b)、Th-Ba/Th(c)和Th/Yb-Sr/Nd(d)判别图解

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    图 10  古坡高镁安山岩Ti-V(a，据参考文献[19, 53]修改)和Th-La /Yb(b，据参考文献[27, 54]修改)构造环境判别图解

    Figure 10. 

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    表 1  关子镇蛇绿混杂岩古坡变质辉石石英闪长岩LA-ICP-MS锆石U-Th-Pb测试结果

    Table 1.  LA-ICP-MS U-Th-Pb dating of zircons from Gupo metamorphic pyroxene quartz diorite in the Guanzi Town ophiolite melange

    点号 含量/10-6 Th/U 同位数比值 年龄/Ma
    Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 208Pb/232Th 1σ 207Pb/235U 1σ 206Pb/238U 1σ
    变质安山岩岩块(DF5)
    DF5-02 1874 1832 1.0 0.1396 0.0024 1.3824 0.0316 0.0720 0.0014 0.0224 0.0010 881.4 13.5 504.5 8.7
    DF5-03 750 1279 0.6 0.0683 0.0016 0.7523 0.0130 0.0804 0.0010 0.0175 0.0012 569.6 7.5 506.6 5.8
    DF5-04 963 1256 0.8 0.0618 0.0010 0.7163 0.0099 0.0843 0.0007 0.0243 0.0009 548.5 5.9 524.9 4.4
    DF5-05 1376 2188 0.6 0.1143 0.0033 1.1700 0.0210 0.0754 0.0012 0.0257 0.0010 786.7 9.8 509.5 7.0
    DF5-06 1233 1229 1.0 0.0590 0.0008 0.6640 0.0093 0.0817 0.0006 0.0236 0.0008 517.1 5.7 507.6 3.6
    DF5-10 1363 2007 0.7 0.1099 0.0016 1.1250 0.0133 0.0744 0.0008 0.0227 0.0010 765.4 6.3 500.3 4.7
    DF5-11 2105 2128 1.0 0.1365 0.0016 1.4175 0.0167 0.0754 0.0009 0.0237 0.0010 896.3 7.0 525.1 5.1
    DF5-12 1527 1559 1.0 0.1488 0.0045 1.4343 0.0423 0.0701 0.0008 0.0191 0.0009 903.3 17.7 498.2 4.5
    DF5-13 1435 1962 0.7 0.0975 0.0012 1.0666 0.0185 0.0791 0.0008 0.0179 0.0008 737.1 9.1 520.8 4.7
    DF5-15 301 1153 0.3 0.0639 0.0009 0.7170 0.0105 0.0814 0.0006 0.0239 0.0010 548.9 6.2 509.2 3.7
    DF5-16 934 1756 0.5 0.0814 0.0016 0.9050 0.0219 0.0805 0.0008 0.0226 0.0009 654.4 11.7 517 4.6
    DF5-18 941 1729 0.5 0.0810 0.0013 0.9145 0.0187 0.0817 0.0007 0.0225 0.0009 659.5 9.9 524 4.3
    DF5-19 1527 1895 0.8 0.1062 0.0033 1.1078 0.0187 0.0774 0.0015 0.0221 0.0009 757.1 9.0 516 8.9
    DF5-20 2254 2213 1.0 0.1240 0.0014 1.3140 0.0175 0.0769 0.0008 0.0186 0.0008 851.9 7.7 526 5.0
    DF5-22 1825 1318 1.4 0.1138 0.0024 1.1945 0.0305 0.0759 0.0007 0.0194 0.0011 798.0 14.1 512.2 4.4
    DF5-23 2013 1439 1.4 0.1666 0.0025 1.6503 0.0241 0.0720 0.0008 0.0241 0.0011 989.7 9.2 522.8 4.7
    DF5-24 1906 1362 1.4 0.1496 0.0042 1.4662 0.0366 0.0714 0.0007 0.0194 0.0009 916.6 15.1 507.3 4.1
    DF5-25 491 928 0.5 0.0646 0.0011 0.7416 0.0151 0.0833 0.0009 0.0288 0.0014 563.3 8.8 520.9 5.3
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    表 2  关子镇蛇绿混杂岩古坡变质玄武安山岩/辉石石英闪长岩-变质安山岩主量、微量和稀土元素分析结果

    Table 2.  Major, trace element and REE analyses of the Gupo metamorphic basaltic andesite/ pyroxene quartz diorite-metamorphic andesite/diorite in the Guanzi Town ophiolite melange

    样品号 YQ013 PM01YQ01 PM01YQ02 PM01YQ03 PM01YQ04 PM03YQ8 PM03YQ9 YQ011
    岩性 变质辉石石英闪长岩 变质玄武安山岩 变质安山岩
    SiO2 54.31 54.98 54.56 54.36 54.27 58.31 58.47 57.31
    Al2O3 16.77 17.07 16.56 16.30 18.38 14.41 12.49 16.67
    TiO2 0.93 0.38 0.40 0.40 0.45 0.31 0.27 0.63
    Fe2O3 4.54 1.86 2.26 2.17 2.53 2.26 1.84 3.83
    FeO 4.02 5.90 5.91 6.11 5.67 6.12 6.23 4.07
    CaO 9.34 8.46 8.88 9.21 7.51 6.78 8.29 7.38
    MgO 7.20 8.28 8.76 8.87 7.69 8.17 8.99 6.89
    K2O 1.27 0.90 0.78 0.78 0.80 0.11 0.09 1.50
    Na2O 1.20 1.88 1.60 1.51 2.37 3.35 3.15 1.39
    MnO 0.15 0.19 0.18 0.18 0.21 0.15 0.14 0.15
    P2O5 0.29 0.11 0.10 0.10 0.11 0.05 0.04 0.20
    烧失量 3.1 2.39 2.17 2.06 2.14 0.73 0.98 3.06
    Mg# 61.29 66.08 66.25 66.22 63.31 64.12 67.05 62.06
    TFeO/MgO 1.13 0.92 0.91 0.91 1.03 1.00 0.88 1.09
    Na2O/K2O 0.94 2.08 2.04 1.94 2.97 30.42 34.27 0.92
    La 12.50 2.30 2.30 2.38 2.04 2.00 1.67 9.56
    Ce 27.90 5.74 6.06 5.75 6.74 4.72 5.16 23.00
    Pr 3.46 0.86 0.87 0.83 0.92 0.72 0.59 2.61
    Nd 14.00 4.20 4.13 3.94 4.69 3.48 2.82 10.40
    Sm 3.37 1.24 1.20 1.14 1.40 1.06 0.86 2.54
    Eu 1.10 0.38 0.38 0.38 0.48 0.36 0.32 0.70
    Gd 3.67 1.52 1.49 1.41 1.74 1.19 0.98 2.70
    Tb 0.49 0.23 0.22 0.21 0.26 0.25 0.20 0.38
    Dy 3.19 1.67 1.66 1.52 1.90 1.74 1.40 2.62
    Ho 0.62 0.34 0.34 0.32 0.40 0.39 0.30 0.53
    Er 1.86 1.04 1.06 0.98 1.24 1.13 0.88 1.73
    Tm 0.26 0.16 0.16 0.15 0.18 0.22 0.17 0.25
    Yb 1.82 1.01 1.02 0.98 1.18 1.39 1.06 1.79
    Lu 0.29 0.16 0.16 0.16 0.18 0.24 0.18 0.29
    Y 17.60 8.29 8.99 8.23 10.80 10.44 8.34 14.90
    Cs 2.30 2.96 1.24 0.85 1.52 0.48 1.66 3.40
    Rb 5.90 15.20 5.90 5.90 5.90 1.77 1.24 5.90
    Ba 176.00 53.00 46.80 56.80 36.10 28.80 13.24 247.00
    Th 4.10 0.78 0.66 0.54 0.38 0.81 0.53 4.90
    U 1.15 0.48 0.44 0.42 0.44 0.52 0.22 1.11
    Nb 12.10 3.30 3.40 3.40 3.80 1.17 0.58 9.50
    Ta 0.70 0.17 0.16 0.16 0.17 0.13 0.08 0.60
    Pb 10.10 1.80 1.74 1.58 1.64 2.37 3.39 9.50
    Sr 98.90 148.00 144.00 126.00 164.00 121.40 137.35 84.70
    P 1244.49 478.04 441.21 450.62 490.38 200.29 188.27 880.40
    Zr 85.40 29.80 27.30 25.20 35.10 345.85 57.05 89.20
    Hf 0.20 0.17 0.15 0.17 0.18 9.06 1.69 0.20
    V 214.00 208.00 216.00 230.00 226.00 195.80 182.36 159.00
    Cr 1152.00 1373.00 1808.00 1830.00 919.00 394.70 488.60 1293.00
    Ni 210.00 158.00 170.00 168.00 134.00 90.77 119.28 358.00
    LREE 62.33 14.72 14.94 14.42 16.27 12.33 11.42 48.81
    HREE 12.2 6.13 6.11 5.73 7.08 6.54 5.17 10.29
    ΣREE 74.53 20.85 21.05 20.15 23.35 18.87 16.59 59.10
    LaN/YbN 4.93 1.63 1.62 1.74 1.24 1.03 1.13 3.83
    δEu 0.96 0.85 0.87 0.92 0.94 0.98 1.06 0.82
    Sr/Y 5.62 17.85 16.02 15.31 15.19 11.63 16.47 5.68
    La/Yb 6.87 2.28 2.25 2.43 1.73 1.44 1.57 5.34
    Ti/V 27.62 17.59 19.12 18.45 18.11 9.34 8.61 26.15
    Th/La 0.33 0.34 0.29 0.23 0.19 0.40 0.32 0.51
    Th/Sm 1.22 0.63 0.55 0.47 0.27 0.76 0.61 1.93
    Th/Yb 2.25 0.77 0.65 0.55 0.32 0.58 0.50 2.74
    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

    表 3  实验HMA熔浆的MgO最低值和建议值[1, 42]

    Table 3.  The lowest value of MgO of they experimental HMA-melt and the suggested values

    元素 实验HMA的MgO最低值 建议MgO最低值
    SiO2/% 52.98 54.35 60.26 52 55 60
    MgO/% 6.58 6.00 5.77 7.0 6.0 5.7
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