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哀牢山构造带南段马玉花岗闪长岩地球化学特征及其锆石U-Pb年龄

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孙崇波, 李忠权, 王道永, 陈晓东. 哀牢山构造带南段马玉花岗闪长岩地球化学特征及其锆石U-Pb年龄[J]. 地质通报, 2019, 38(2-3): 223-230.
引用本文: 孙崇波, 李忠权, 王道永, 陈晓东. 哀牢山构造带南段马玉花岗闪长岩地球化学特征及其锆石U-Pb年龄[J]. 地质通报, 2019, 38(2-3): 223-230.
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SUN Chongbo, LI Zhongquan, WANG Daoyong, CHEN Xiaodong. Petrogeochemistry and zircon U-Pb age of the Mayu granodiorite in the southern section of Ailaoshan tectonic belt[J]. Geological Bulletin of China, 2019, 38(2-3): 223-230.
Citation: SUN Chongbo, LI Zhongquan, WANG Daoyong, CHEN Xiaodong. Petrogeochemistry and zircon U-Pb age of the Mayu granodiorite in the southern section of Ailaoshan tectonic belt[J]. Geological Bulletin of China, 2019, 38(2-3): 223-230.
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哀牢山构造带南段马玉花岗闪长岩地球化学特征及其锆石U-Pb年龄

  • 1.

    自然资源部构造成矿成藏重点实验室(成都理工大学)/油气藏地质及开发工程国家重点实验室(成都理工大学), 四川 成都 610059

  • 2.

    四川冶金地质勘查局水文工程大队, 四川 成都 611730

  • 基金项目:
    中国地质调查局项目《西南三江成矿带南段基础地质调查》(编号：1212010880406)和《云南1:5万骂尼街等四幅区域地质矿产调查》(编号：1212011120582)
详细信息
    作者简介: 孙崇波(1985-), 男, 在读博士生, 构造地质学专业。E-mail:1315333036@qq.com

  • 中图分类号: P588.12+2

Petrogeochemistry and zircon U-Pb age of the Mayu granodiorite in the southern section of Ailaoshan tectonic belt

  • 1.

    Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation of Ministry of Natural Resources(Chengdu University of Technology/State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation(Chengdu University of Technology), Chengdu 610059, Sichuan, China

  • 2.

    Hydro-Engineering Party of Sichuan Metallurgical Geology and Exploration Bureau, Chengdu 611730, Sichuan, China

    摘要

  • 对云南墨江县马玉花岗闪长岩进行了锆石U-Pb年龄和岩石地球化学分析。LA-ICP-MS锆石U-Pb测年显示，马玉花岗闪长岩年龄为263.6±2.4Ma，形成于晚二叠世。岩石地球化学显示，马玉花岗闪长岩SiO2含量为59.56%~70.50%，全碱(Na2O+K2O)含量为5.16%~7.92%，且Na2O>K2O；岩石富集轻稀土元素，负Eu异常明显(δEu=0.84~1.32)，相对富集Sc、Hf，相对贫化Sr、Zr、Th、U。构造环境判别图解显示，马玉花岗闪长岩形成于碰撞期后板内构造环境，说明哀牢山构造带的古特提斯支洋或弧后盆地在晚二叠世(263.6±2.4Ma)已经闭合。

    This study presents bulk petrogeochemistry and zircon U-Pb dating results for the Mayu granodiorite in Mojiang, Yunnan. LA-ICP-MS zircon U-Pb dating results show that the Mayu granodiorite was formed in the Late Permian period (263.6±2.4Ma). The Mayu granodiorite is characterized by SiO2 content of 59.56%~70.50%, alkali (Na2O+K2O)5.16%~7.92%, and Na2O higher than K2O. It is enriched in LREE and Sc, Hf, and depleted in Sr, Zr, Th, U, with negative Eu anomalies (δEu:0.84~1.32). According to the diagrams, the Mayu granodiorite was formed in a tectonic environment of island arc-continent or continental-arc collision, indicating that the branch of Paleo-Tethys Ocean or arc basin in Ailaoshan tectonic belt may have been closed in the Late Permian (263.6±2.4Ma).

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  • 图 1  区域构造图(a)及研究区地质略图(b)

    Figure 1. 

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    图 2  马玉花岗闪长岩锆石阴极发光(CL)图像

    Figure 2. 

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    图 3  马玉花岗闪长岩锆石U-Pb谐和图(a)及年龄加权平均图(b)

    Figure 3. 

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    图 4  R1-R2图解(据参考文献[25]修改)

    Figure 4. 

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    图 5  构造环境图解(据参考文献[26]修改)

    Figure 5. 

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    图 6  马玉花岗闪长岩稀土元素配分模式图(a)和原始地幔标准化蛛网图(b)(标准值据参考文献[27])

    Figure 6. 

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    表 1  马玉花岗闪长岩LA-ICP-MS锆石U-Th-Pb同位素测试结果

    Table 1.  LA-ICP-MS zircon U-Th-Pb analyses of the Mayu granodiorite

    样品号 含量/10-6 同位素比值 年龄/Ma
    Pb U 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ
    PM34H1 146 3717 0.04151 0.00036 0.2938 0.0020 0.05132 0.00022 262.2 2.3 261.5 1.7 255.2 9.7
    PM34H2 6 141 0.04075 0.00039 0.3150 0.0104 0.05606 0.00179 257.5 2.5 278.0 9.2 454.6 70.9
    PM34H3 34 816 0.04201 0.00047 0.3149 0.0033 0.05438 0.00051 265.2 3.0 278.0 2.9 386.7 21.2
    PM34H4 13 306 0.04267 0.00073 0.2937 0.0068 0.04993 0.00104 269.3 4.6 261.5 6.0 191.6 48.5
    PM34H5 142 3588 0.04222 0.00040 0.2971 0.0022 0.05104 0.00022 266.6 2.5 264.2 2.0 242.6 9.7
    PM34H6 28 676 0.04313 0.00055 0.3196 0.0044 0.05374 0.00050 272.2 3.4 281.6 3.9 360.1 20.9
    PM34H7 18 408 0.04207 0.00035 0.3078 0.0044 0.05306 0.00075 265.7 2.2 272.5 3.9 331.2 32.0
    PM34H8 190 4620 0.04248 0.00055 0.3128 0.0039 0.05341 0.00026 268.2 3.5 276.3 3.5 346.1 10.9
    PM34H9 31 725 0.04263 0.00036 0.3030 0.0025 0.05156 0.00034 269.1 2.3 268.8 2.2 265.9 15.2
    PM34H10 23 563 0.04100 0.00034 0.3009 0.0031 0.05323 0.00056 259.0 2.1 267.1 2.7 338.5 23.9
    PM34H11 38 992 0.04080 0.00037 0.2864 0.0024 0.05091 0.00031 257.8 2.3 255.7 2.2 236.9 14.0
    PM34H12 15 350 0.04074 0.00044 0.2855 0.0065 0.05083 0.00100 257.4 2.8 255.0 5.8 232.9 45.6
    PM34H13 17 414 0.04329 0.00067 0.3116 0.0062 0.05221 0.00079 273.2 4.2 275.5 5.5 294.8 34.7
    PM34H14 24 497 0.04137 0.00046 0.3063 0.0050 0.05370 0.00072 261.3 2.9 271.3 4.4 358.4 30.0
    PM34H15 18 419 0.04265 0.00042 0.3170 0.0040 0.05390 0.00058 269.2 2.6 279.6 3.5 367.0 24.2
    PM34H16 105 2606 0.04177 0.00032 0.2963 0.0017 0.05155 0.00022 263.8 2.0 263.5 1.5 261.0 9.8
    PM34H17 10 230 0.04126 0.00041 0.3125 0.0067 0.05493 0.00112 260.6 2.6 276.1 5.9 409.3 45.7
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    表 2  马玉花岗闪长岩主量、微量和稀土元素分析数据

    Table 2.  Major, trace and rare earth element compositions of the Mayu granodiorite

    样号 PM34H1 PM34H2 PM34H3 PM34H4 PM34H5 PM34H6 PM34H7 PM34H8
    SiO2 59.56 69.47 68.34 69.62 70.50 66.93 66.71 66.7
    Al2O3 14.46 13.60 13.14 14.45 14.08 16.21 14.89 15.09
    Fe2O3 1.48 0.63 0.99 0.43 0.88 1.95 1.95 1.28
    FeO 5.67 2.62 3.30 2.54 2.07 2.44 2.47 2.97
    P2O5 0.22 0.13 0.16 0.09 0.079 0.091 0.13 0.13
    K2O 2.55 3.62 3.81 3.87 4.04 3.38 2.56 2.88
    Na2O 2.61 4.30 2.80 3.41 3.34 3.24 4.03 3.19
    MgO 5.04 1.74 2.16 0.86 0.88 1.44 1.40 1.46
    CaO 3.45 1.69 3.17 2.76 1.93 0.61 1.93 4.25
    TiO2 0.89 0.35 0.49 0.36 0.36 0.51 0.56 0.53
    MnO 0.110 0.049 0.056 0.052 0.042 0.060 0.067 0.062
    烧失量 3.58 1.72 1.54 1.36 1.86 3.02 3.20 1.42
    总量 99.62 99.92 99.96 99.8 100.06 99.88 99.9 99.96
    Q 17.41 23.54 26.84 26.8 29.76 31.78 27.37 25.33
    An 16.32 7.25 12.23 12.89 9.22 2.51 9.03 18.62
    Ab 23.00 37.05 24.07 29.31 28.78 28.31 35.27 27.39
    Or 15.69 21.79 22.88 23.23 24.31 20.63 15.65 17.27
    C 1.73 0 0 0 0.91 6.54 2.37 0
    Di 0 0.35 2.21 0.35 0 0 0 1.58
    Hy 21.32 8.11 8.99 5.87 4.84 6.36 6.24 6.6
    Il 1.76 0.68 0.95 0.69 0.7o 1.00 1.1o 1.02
    Mt 2.23 0.93 1.46 0.63 1.3 2.66 2.67 1.88
    Ap 0.53 0.31 0.38 0.21 0.19 0.22 0.31 0.31
    DI 56.1 82.38 73.79 79.34 82.85 80.72 78.29 69.99
    SI 29.05 13.48 16.54 7.74 7.85 11.58 11.3 12.39
    AR 1.81 3.15 2.36 2.47 2.71 2.3 2.29 1.91
    σ 1.52 2.34 1.71 1.97 1.96 1.79 1.79 1.54
    NK 5.16 7.92 6.61 7.28 7.38 6.62 6.59 6.07
    A/CNK 1.085 0.967 0.907 0.975 1.053 1.605 1.153 0.938
    Sc 19 7.88 9.12 7.6 6.89 10.3 10.7 10.2
    Cr 107.00 38.90 53.10 9.87 13.30 14.40 15.70 16.20
    Co 21.1 6.18 9.43 5.4 5.02 8.28 8.25 8.28
    Ni 22.2 11.5 18.0 6.80 4.82 5.80 5.88 8.02
    Zn 90.0 44.4 64.0 49.2 35.2 59.8 83.3 63.7
    Rb 95.6 108 125 123 127 133 104 103
    Sr 470 203 413 251 271 277 173 278
    Cs 5.47 5.74 6.62 9.98 14.80 10.70 6.98 8.11
    Ba 754 1279 1092 637 738 1129 606 598
    Zr 122 162 187 116 98.9 155 144 127
    Ta 0.83 0.99 0.87 1.00 0.98 1.05 1.08 0.96
    Th 6.43 16.9 15.5 16.8 16.7 15.3 14.2 13.4
    U 1.45 2.48 1.95 3.40 2.64 2.29 3.50 2.21
    Hf 3.37 4.64 5.18 3.41 2.74 4.30 4.21 3.51
    Mo 0.17 0.08 0.16 0.20 0.19 0.06 0.07 0.18
    W 0.34 0.57 0.40 0.41 0.72 1.55 0.84 0.31
    Sn 2.1 3.1 2.2 2.6 1.8 1.7 2.3 2.2
    As 2.80 5.32 0.87 2.06 1.88 0.97 2.88 1.39
    Sb 0.69 1.71 0.18 0.17 0.33 0.58 0.97 0.29
    Ag 0.033 < 0.020 0.026 < 0.020 0.040 0.030 0.023 0.026
    Au 0.50 0.37 0.35 0.55 0.86 0.36 0.34 0.40
    Cu 10.80 3.35 4.42 2.01 11.00 3.78 4.61 4.09
    Gd 5.58 5.46 4.51 15.1 6.11 5.50 6.03 5.64
    Tb 1.03 0.86 0.68 2.58 1.03 0.97 1.15 0.99
    Dy 4.93 3.26 2.64 12.7 5.19 5.14 6.50 5.22
    Ho 1.08 0.62 0.57 2.88 1.22 1.07 1.34 1.10
    Er 3.15 1.84 1.64 8.06 3.48 3.21 4.15 3.30
    Tm 0.45 0.23 0.22 1.07 0.55 0.49 0.65 0.49
    Yb 2.80 1.52 1.47 6.02 3.46 3.05 4.13 3.11
    Lu 0.39 0.21 0.21 0.82 0.46 0.44 0.55 0.42
    Y 26.3 15.8 13.0 80.6 27.5 24.3 31.3 25.2
    ΣREE 147.13 241.54 189.47 324.46 179.94 167.93 166.46 159.32
    LREE 127.72 227.54 177.53 275.23 158.44 148.06 141.96 139.05
    HREE 19.41 14.00 11.94 49.23 21.50 19.87 24.50 20.27
    LREE/HREE 6.58 16.25 14.87 5.59 7.37 7.45 5.79 6.86
    LaN/YbN 6.81 26.62 21.62 13.23 8.40 8.51 6.57 8.14
    δEu 0.84 1.16 1.16 0.86 0.84 1.01 1.21 0.96
    δCe 0.92 1.01 0.92 0.32 0.9 0.96 0.80 0.91
    注：主量元素含量单位为%，微量和稀土元素为10-6
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收稿日期:  2017-09-09
修回日期:  2017-11-15
刊出日期:  2019-03-15

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