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南秦岭桐柏地区程湾花岗岩LA-MC-ICP-MS锆石U-Pb年龄及地球化学特征

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李运冬. 南秦岭桐柏地区程湾花岗岩LA-MC-ICP-MS锆石U-Pb年龄及地球化学特征[J]. 地质通报, 2018, 37(7): 1213-1225.
引用本文: 李运冬. 南秦岭桐柏地区程湾花岗岩LA-MC-ICP-MS锆石U-Pb年龄及地球化学特征[J]. 地质通报, 2018, 37(7): 1213-1225.
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LI Yundong. LA-MC-ICP-MS zircon U-Pb age and geochemical characteristics of the Chengwan granite in Tongbai area, South Qinling[J]. Geological Bulletin of China, 2018, 37(7): 1213-1225.
Citation: LI Yundong. LA-MC-ICP-MS zircon U-Pb age and geochemical characteristics of the Chengwan granite in Tongbai area, South Qinling[J]. Geological Bulletin of China, 2018, 37(7): 1213-1225.
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南秦岭桐柏地区程湾花岗岩LA-MC-ICP-MS锆石U-Pb年龄及地球化学特征

  • 河南省地质矿产勘查开发局第三地质矿产调查院, 河南 信阳 464000

  • 基金项目:
    中国地质调查局项目《河南1：5万官庄（I49E019022）、泌阳县（I49E020022）、平氏（I49E021021）、马道幅（I49E021022）区域地质矿产调查》（编号：1212011220499）和《河南省围山城地区深部资源调查》（编号：DD2016005237）
详细信息
    作者简介: 李运冬(1984-), 男, 硕士, 高级工程师, 从事区域地质矿产调查工作。E-mail:184264846lyd@163.com

  • 中图分类号: P588.12+1;P597+.3

LA-MC-ICP-MS zircon U-Pb age and geochemical characteristics of the Chengwan granite in Tongbai area, South Qinling

  • No.3 Geological Survey Institute, Henan Bureau of Geo-exploration and Mineral Development, Xinyang 464000, He'nan, China

    摘要

  • 程湾花岗岩位于南秦岭桐柏地区，岩性主要为片麻状（黑云母）正长花岗岩，岩石地球化学成分显示其高硅、富碱、贫镁、低磷和低钛的特征，A/CNK=0.99~1.40，平均为1.17，为高钾钙碱性系列过铝质岩石，稀土元素配分曲线总体表现为右倾斜的"海鸥式"，具有负Eu异常（δEu=0.11~0.81，平均0.46）。岩石富集高场强元素Zr、Th、Hf和Rb、K，强烈亏损Ba、Sr、P、Ti，10000Ga/Al值在2.84~3.63之间，计算锆石饱和温度为817~879℃，属于A2型花岗岩。正长花岗岩LA-MC-ICP-MS锆石U-Pb测年结果表明，其206Pb/238U年龄加权平均值为793.0±4.1Ma，表明岩体形成于新元古代青白口纪晚期，而非前人认为的早古生代，其形成与Rodinia超大陆的裂解有关，且形成于裂解的初期阶段。桐柏地区当时仍为扬子大陆北缘的南秦岭，在新元古代中-晚期（825~611Ma）整体上处于陆内裂解的构造体制。

    The Chengwan granite is located in Tongbai area, South Qinling. The lithology is mainly granulite (biotite) syenite granite. Lithochemical analysis shows that it has high SiO2, high alkali, poor MgO and low TiO2, and A/CNK=0.99~1.40, with an average of 1.17, thus belonging to the high-K calc-alkaline series. Chondrite-normalized REE patterns of the Chenwang granite are characterized by right-inclined "seagull"with Eu anomalies (δEu=0.11~0.81, 0.46 on average). The rock is characterized by enrichment of HFSE (Zr, Th, Hf), Rb, K, and strong depletion of Ba, Sr, P and Ti. The values of 10000Ga/Al range from 2.84 to 3.63. Zircon saturation temperatures range from 817~879℃. All these features suggest that the Chengwan granite belongs to A2-type granite. LA-MC-ICP-MS U-Pb dating yielded a weighted mean 206Pb/238U age of 793.0±4.1Ma for the zircon from syenogranite, indicating that the Chengwan granite was formed in the late Neoproterozoic Qingbaikouan period rather than previously considered Early Paleozoic. Its formation was related to the breakup of Rodinia supercontinent, and was formed in the early stage of breakup. The South Qinling still belonged to the northern margin of the Yangtze continental margin in Tongbai area, globally belonging to continental cleavage at the middle to late stage of the Neoproterozoic (about 825Ma to 611Ma).

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  • 图 1  桐柏地区地质简图(据参考文献②修改)

    Figure 1. 

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    图 2  程湾花岗岩宏观及微观特征

    Figure 2. 

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    图 3  程湾花岗岩锆石阴极发光(CL)图像及测点年龄

    Figure 3. 

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    图 4  程湾花岗岩锆石U-Pb谐和图

    Figure 4. 

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    图 5  程湾花岗岩R1-R2分类图解(底图据参考文献[19])

    Figure 5. 

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    图 6  程湾花岗岩系列判别图(a、b、c、d底图分别据参考文献[20-23])

    Figure 6. 

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    图 7  程湾花岗岩球粒陨石标准化稀土元素配分模式图

    Figure 7. 

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    图 8  程湾花岗岩原始地幔标准化微量元素蛛网图

    Figure 8. 

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    图 9  程湾花岗岩10000Ga/Al-(Na2O+K2O) /CaO (a)和10000Ga/Al-Zr (b)图解

    Figure 9. 

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    图 10  程湾花岗岩Nb-Y-Ce(a)和Nb-Y-3Ga(b)三角图解(底图据参考文献[35]，图例同图 7)

    Figure 10. 

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    图 11  程湾花岗岩(Yb+Ta)-Rb (a) (底图据参考文献[35])和Rb/30-Hf-3Ta (b)构造环境判别图解(底图据参考文献[42]，图例同图 7)

    Figure 11. 

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    表 1  程湾花岗岩LA-MC-ICP-MS锆石U-Th-Pb同位素测定数据

    Table 1.  The U-Th-Pb isotope composition of zircons from the Chengwan granite measured by LA-MC-ICP-MS

    测点号 Pb U Th/U 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 年龄/Ma
    /10-6 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ
    1 13 85 1.08 0.1319 0.001 1.1950 0.030 0.0657 0.002 798 8 798 20 798 49
    2 10 65 0.85 0.1316 0.001 1.1948 0.041 0.0658 0.002 797 8 798 27 801 70
    3 28 196 0.68 0.1313 0.001 1.1915 0.019 0.0658 0.001 795 8 797 13 800 30
    4 32 241 0.54 0.1243 0.001 1.1578 0.019 0.0676 0.001 755 7 781 13 855 33
    5 23 165 0.52 0.1306 0.001 1.1892 0.021 0.0661 0.001 791 8 796 14 808 34
    6 16 109 0.65 0.1300 0.001 1.1785 0.029 0.0657 0.002 788 8 791 20 798 50
    7 11 72 0.75 0.1298 0.001 1.1933 0.029 0.0667 0.002 787 8 797 19 828 48
    8 7 46 0.89 0.1334 0.001 1.2067 0.044 0.0656 0.002 807 8 804 29 794 74
    9 28 197 0.51 0.1313 0.001 1.1933 0.025 0.0659 0.001 795 8 797 17 804 42
    10 15 106 0.64 0.1308 0.001 1.1821 0.027 0.0655 0.001 793 8 792 18 791 46
    11 22 144 0.82 0.1316 0.001 1.1930 0.023 0.0658 0.001 797 8 797 15 799 38
    12 54 378 0.69 0.1302 0.001 1.1808 0.016 0.0658 0.001 789 8 792 11 799 26
    13 22 144 1.22 0.1247 0.001 1.1592 0.026 0.0674 0.001 757 7 782 17 852 44
    14 47 398 0.87 0.0970 0.001 0.9539 0.013 0.0713 0.001 597 6 680 9 967 26
    15 44 322 0.67 0.1258 0.001 1.1609 0.020 0.0669 0.001 764 7 782 14 835 33
    16 22 183 0.60 0.1088 0.001 1.0219 0.020 0.0681 0.001 666 7 715 14 872 38
    17 26 216 0.72 0.1043 0.001 0.9915 0.018 0.0690 0.001 640 6 700 13 897 35
    18 38 306 0.84 0.1090 0.001 1.0150 0.020 0.0675 0.001 667 6 711 14 855 40
    19 37 331 0.73 0.1008 0.001 0.9674 0.015 0.0696 0.001 619 6 687 10 916 28
    20 19 149 0.57 0.1149 0.001 1.0682 0.025 0.0674 0.002 701 7 738 17 851 48
    21 34 309 0.41 0.1025 0.001 0.9795 0.020 0.0693 0.001 629 6 693 14 908 38
    22 27 175 0.94 0.1317 0.001 1.1926 0.020 0.0657 0.001 798 8 797 14 796 33
    23 28 184 0.87 0.1304 0.001 1.1965 0.020 0.0665 0.001 790 8 799 14 823 33
    24 14 88 1.15 0.1286 0.001 1.1767 0.031 0.0664 0.002 780 8 790 21 818 54
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    表 2  程湾花岗岩主量、微量及稀土元素分析结果

    Table 2.  Major, trace and rare earth element concentrations of the Chengwan granite

    样号 D0556 D0557 D9051 D9027 D9028 ZW-1* 0003/6* 102/1* ZY25*
    SiO2 75.60 74.78 75.38 77.16 74.48 77.78 76.76 76.09 76.91
    TiO2 0.05 0.21 0.23 0.19 0.24 0.20 0.15 0.08 0.13
    Al2O3 13.52 13.41 13.16 11.74 13.98 11.37 12.28 12.85 12.16
    Fe2O3 0.27 0.18 0.18 1.59 1.28 1.70 1.33 1.61 1.40
    FeO 0.58 1.67 1.03 0.48 0.73 0.18 0.26 0.35 0.34
    MnO 0.05 0.07 0.02 0.08 0.07 0.02 0.13 0.025 0.05
    MgO 0.09 0.35 0.12 0.31 0.33 0.05 0.48 0.13 0.17
    CaO 0.69 0.73 0.40 0.85 0.86 0.42 0.11 0.18 0.25
    Na2O 4.37 3.00 3.62 3.30 3.20 3.90 2.88 3.71 3.61
    K2O 3.69 3.95 4.64 3.59 4.00 4.00 3.54 4.31 4.02
    P2O5 0.02 0.05 0.01 0.05 0.09 0.03 0.04 0.145 0.06
    H2O+ 0.73 0.79 0.87 1.05 0.65
    烧失量 0.59 0.76 0.69 0.55 0.52 0.33 0.84 0.88 0.62
    总计 99.66 99.19 99.66 100.40 99.91 99.65 98.8 99.48 99.72
    A/CNK 1.09 1.27 1.12 1.08 1.25 0.99 1.40 1.16 1.13
    A/NK 1.21 1.46 1.20 1.26 1.46 1.06 1.43 1.19 1.18
    ALK 8.06 6.95 8.26 6.89 7.20 7.90 6.42 8.02 7.63
    R1 2624 2983 2643 3092 2852 2819 3286 2706 2880
    R2 347 364 311 339 386 272 282 279 276
    σ 1.99 1.51 2.01 1.39 1.64 1.79 1.22 1.94 1.72
    DI 93.82 89.10 94.00 91.25 89.30 95.57 92.31 94.68 94.61
    Mg# 16.32 25.41 15.22 22.44 23.83 4.96 37.02 11.42 15.94
    TZr/℃ 732.50 844.50 837.54 823.75 864.72 817.52 829.51 879.46 843.85
    Rb 205 176 164 137 184 89 90 115 98
    Ba 484 678 694 500 597 500 200 600 433
    Th 14.38 17.6 11.1 18.7 13.9 5.9 8.5 5.2 6.5
    U 1.17 1.12 0.79 3.04 1.33
    Nb 13.0 18.2 17.6 26.1 22.9 10.3 22.6 14.1 15.7
    Ta 1.09 0.89 1.43 1.33 1.49 1.29 1.89 0.99 1.39
    Sr 124.0 83.1 82.7 99.0 105 94 58 88 80
    Zr 47.6 158 157 137 196 135 127 234 165
    Hf 2.93 6.86 8.62 7.83 11.70 5.00 4.70 7.40 5.70
    Ga 26.0 22.5 19.8 21.8 25.9
    La 22.35 30.26 34.91 27.60 41.70 27.50 14.05 22.93 20.09
    Ce 46.44 85.74 48.16 52.00 74.90 59.04 36.22 80.96 53.42
    Pr 5.30 7.01 6.78 5.74 9.64 6.05 3.72 5.09 4.83
    Nd 18.59 24.00 23.15 20.00 33.80 18.48 14.89 17.67 15.98
    Sm 3.02 4.08 4.11 3.55 6.69 3.68 3.63 3.90 3.53
    Eu 0.78 0.79 0.70 0.68 0.94 0.40 0.14 0.56 0.32
    Gd 2.72 4.01 3.99 3.34 6.19 3.28 3.82 3.38 3.35
    Tb 0.35 0.49 0.71 0.51 1.05 0.58 0.85 0.71 0.65
    Dy 1.87 2.38 4.46 2.89 6.23 3.53 6.01 4.72 4.37
    Ho 0.42 0.47 0.98 0.61 1.24 0.71 1.34 1.01 0.94
    Er 1.51 1.38 3.15 1.89 3.88 2.20 4.39 3.36 3.04
    Tm 0.34 0.23 0.59 0.34 0.68 0.37 0.77 0.55 0.57
    Yb 2.98 1.57 4.09 2.43 4.67 2.42 5.36 3.85 4.09
    Lu 0.58 0.25 0.66 0.43 0.74 0.36 0.81 0.57 0.54
    Y 14.83 12.73 27.57 17.10 34.60 19.67 36.4 27.79 30.48
    ∑REE 122.06 175.39 164.01 139.11 226.95 148.27 132.40 177.05 146.19
    LREE 96.48 151.88 117.81 109.57 167.67 115.15 72.65 131.11 115.71
    HREE 10.75 10.78 18.63 12.44 24.68 13.45 23.35 18.15 17.55
    LREE/HREE 8.97 14.09 6.32 8.81 6.79 8.56 3.11 7.22 6.59
    (La/Yb)N 5.38 13.83 6.12 8.15 6.41 8.15 1.88 4.27 3.52
    (La/Sm)N 4.77 4.79 5.48 5.02 4.02 4.82 2.50 3.80 3.68
    (Gd/Yb)N 0.75 2.11 0.81 1.13 1.09 1.12 0.59 0.72 0.68
    δEu 0.81 0.59 0.52 0.59 0.44 0.35 0.11 0.46 0.28
    δCe 1.01 1.39 0.72 0.96 0.88 1.07 1.20 1.76 1.29
    注：*数据据参考文献②；主量元素含量单位为%，微量和稀土元素为10-6
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