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辽东前寒武纪沉积变质型铁矿床中伴生铀矿的成矿时代与测年结果可靠性分析

孙欣宇, 李立兴, 李厚民, 章永梅, 孟洁, 李小赛, 王亿

孙欣宇,李立兴,李厚民,等. 辽东前寒武纪沉积变质型铁矿床中伴生铀矿的成矿时代与测年结果可靠性分析[J]. 岩矿测试,2023,42(6):1090−1103. DOI: 10.15898/j.ykcs.202301020001
引用本文: 孙欣宇,李立兴,李厚民,等. 辽东前寒武纪沉积变质型铁矿床中伴生铀矿的成矿时代与测年结果可靠性分析[J]. 岩矿测试,2023,42(6):1090−1103. DOI: 10.15898/j.ykcs.202301020001
SUN Xinyu,LI Lixing,LI Houmin,et al. The Ore-forming Age of the Uranium Mineralization Associated with Precambrian Sedimentary-Metamorphic Iron Deposits in Eastern Liaoning Province and Reliability Analysis of Dating Results[J]. Rock and Mineral Analysis,2023,42(6):1090−1103. DOI: 10.15898/j.ykcs.202301020001
Citation: SUN Xinyu,LI Lixing,LI Houmin,et al. The Ore-forming Age of the Uranium Mineralization Associated with Precambrian Sedimentary-Metamorphic Iron Deposits in Eastern Liaoning Province and Reliability Analysis of Dating Results[J]. Rock and Mineral Analysis,2023,42(6):1090−1103. DOI: 10.15898/j.ykcs.202301020001

辽东前寒武纪沉积变质型铁矿床中伴生铀矿的成矿时代与测年结果可靠性分析

基金项目: 国家重点研发计划项目(2022YFC2905400, 2022YFC2903701);国家自然科学基金项目(42072112)
详细信息
    作者简介:

    孙欣宇,硕士研究生,矿床学专业。E-mail:sxy199809@126.com。

    通讯作者:

    李立兴,博士,研究员,从事金属矿床成矿作用研究。E-mail:llixing@cags.ac.cn。

  • 中图分类号: O785.5;P612;P597.3

The Ore-forming Age of the Uranium Mineralization Associated with Precambrian Sedimentary-Metamorphic Iron Deposits in Eastern Liaoning Province and Reliability Analysis of Dating Results

  • 摘要:

    辽东地区是中国成矿时代最古老的铀矿矿集区,有单铀型和铁矿伴生型两种,其中单铀型矿床成矿年龄已基本厘定,而铁矿伴生型铀矿成矿年龄尚不明确,制约了该类矿床的成因认识。晶质铀矿是铁矿伴生型铀矿中最主要的含铀矿石矿物,对其开展测年能够直接厘定铀矿成矿时代。本文对翁泉沟富蛇纹石磁铁矿矿石和弓长岭石榴子石蚀变岩中的晶质铀矿进行电子探针(EPMA)测年,并利用激光剥蚀电感耦合等离子体质谱法(LA-ICP-MS)对翁泉沟富蛇纹石磁铁矿矿石中的晶质铀矿进行U-Pb测年,两种测年结果相互验证,获得辽东地区铁矿伴生型铀矿的成矿时代为~1.85Ga,并在~1.78Ga遭受了后期热液事件的改造,与单铀型矿床成矿年龄一致,说明辽东地区单铀型和铁矿伴生型铀矿都形成于碰撞后伸展环境。辽东地区铁矿伴生型铀矿不同矿床的成矿热液在流体成分和温度上有差别,但都具有碱性和氧化的特征。

     

  • 图  1   (a)华北克拉通古元古代构造带示意图和(b)辽东地区地质及古元古代热液铀矿分布图(修改据Zhao等23, 2005; 郭春影等7, 2017)

    Figure  1.   (a) Sketch map of Paleoproterozoic orogenic belts in the North China craton and (b) simplified geologic map of the eastern Liaoning Province and the distribution of hydrothermal uranium deposits (After Zhao et al.23, 2005 and Guo et al.7, 2017).

    图  2   翁泉沟和弓长岭铁矿床中晶质铀矿赋存状态和晶质铀矿电子探针及电感耦合等离子体质谱打点位置

    a—翁泉沟蛇纹石磁铁矿矿石; b—翁泉沟晶质铀矿BSE图像; c —翁泉沟晶质铀矿EPMA打点13.1、13.2、13.3、13.4(绿色)和LA-ICP-MS法打点16、17(红色)(BSE图像); d —翁泉沟晶质铀矿EPMA打点34.1、34.2、34.3、34.4(绿色)和LA-ICP-MS法打点12、13(红色)(BSE图像); e—弓长岭富铁矿与石榴子石蚀变岩之间界线明显; f—弓长岭二矿区蚀变岩中晶质铀矿BSE图像,独居石、晶质铀矿与石榴子石共生。Ur—晶质铀矿; Srp—蛇纹石; Phl—金云母; Mag—磁铁矿; Ap—磷灰石; Grt—石榴子石; Mnz—独居石。

    Figure  2.   Occurrence of uraninites in the Wengquangou and Gongchangling iron deposits and the location of EPMA and LA-ICP-MS spots.

    图  3   辽东(a)翁泉沟富蛇纹石磁铁矿矿石和(b)弓长岭二矿区石榴子石蚀变岩中晶质铀矿电子探针年龄频率分布图

    Figure  3.   EPMA age histogram plots of uraninites in (a)the serpentine-enriched magnetite ore from the Wengquangou deposit and (b) the garnet altered rock from the mining area Ⅱ of the Gongchangling deposit.

    图  4   翁泉沟矿床富蛇纹石磁铁矿矿石中晶质铀矿U-Pb谐和图

    Figure  4.   Uraninite U-Pb age concordia of the serpentine-enriched magnetite ore from the Wengquangou deposit.

    图  5   (a) 翁泉沟矿床富蛇纹石磁铁矿矿石中晶质铀矿电子探针年龄与SiO2+CaO+FeO相关关系图; (b)翁泉沟矿床EPMA和LA-ICP-MS法对应点测年结果关系图

    Figure  5.   (a) Binary diagrams of SiO2+CaO+FeO contents and uraninite EPMA ages of the serpentine-enriched magnetite ore from the Wengquangou deposit; (b) Relationship between EPMA and LA-ICP-MS dating results of the Wengquangou deposit.

    表  1   翁泉沟富蛇纹石磁铁矿矿石和弓长岭石榴子石蚀变岩中晶质铀矿电子探针分析数据及年龄计算

    Table  1   EPMA analytical results and age caculations of uraninites of the serpentine-enriched magnetite ore from the Wengquangou deposit and the garnet altered rock from the Gongchangling deposit

    测点编号UO2
    (%)
    ThO2
    (%)
    PbO
    (%)
    SiO2
    (%)
    CaO
    (%)
    FeO
    (%)
    Y2O3
    (%)
    La2O3
    (%)
    Ce2O3
    (%)
    Nd2O3
    (%)
    Total
    (%)
    年龄
    (Ma)
    WQG5-1 68.55 2.83 16.29 0.79 2.05 0.60 1.16 92.28 1862
    WQG5-2 71.22 1.79 17.16 0.03 1.05 1.70 0.09 0.38 0.65 94.06 1899
    WQG5-3 67.48 2.30 14.04 0.03 0.23 1.84 4.59 0.21 0.55 1.86 93.13 1635
    WQG5-4 69.44 1.60 14.57 0.06 0.25 0.11 3.95 0.15 0.43 0.65 91.21 1655
    WQG5-5 66.69 3.07 15.22 0.01 0.20 0.22 4.45 0.21 0.60 1.72 92.38 1785
    WQG5-6 66.55 3.15 14.89 0.06 0.28 0.08 4.05 0.08 0.55 1.85 91.52 1749
    WQG5-7 67.11 2.33 15.26 0.02 0.21 4.38 0.03 0.29 1.25 90.86 1786
    WQG5-8.1 66.99 2.57 15.25 0.04 0.21 0.06 4.28 0.02 0.54 1.44 91.40 1785
    WQG5-8.2 66.86 2.70 15.60 0.18 0.09 4.12 0.11 0.50 1.38 91.53 1828
    WQG5-9.1 66.90 1.20 15.94 0.02 0.71 0.08 2.87 0.24 2.91 2.53 93.39 1882
    WQG5-9.2 65.99 1.07 15.47 0.02 0.66 0.03 2.90 0.06 3.34 2.95 92.48 1854
    WQG5-10 67.20 1.14 15.50 0.03 0.25 0.29 3.51 1.89 2.36 92.15 1823
    WQG5-11 67.54 2.27 15.86 0.03 0.46 0.98 3.18 0.36 1.07 1.92 93.66 1845
    WQG5-12 67.20 1.61 15.96 0.03 0.41 0.13 2.44 0.10 3.01 2.74 93.64 1872
    WQG5-13.1 67.15 2.63 14.92 0.28 0.04 3.93 0.39 1.33 90.67 1741
    WQG5-13.2 68.32 3.06 16.48 0.02 0.44 0.01 2.58 0.61 1.40 92.93 1888
    WQG5-13.3 68.26 2.86 15.27 0.03 0.26 0.15 3.29 0.20 0.29 1.31 91.91 1752
    WQG5-13.4 67.06 2.66 15.31 0.03 0.25 3.98 0.06 0.24 1.40 90.99 1790
    WQG5-13.5 66.03 3.66 14.81 0.01 0.19 0.11 4.18 0.17 0.44 1.34 90.93 1748
    WQG5-14.1 67.09 2.42 15.90 0.02 0.27 0.06 4.11 0.40 1.40 91.67 1860
    WQG5-14.2 70.54 1.91 16.57 1.24 0.22 1.84 0.48 1.12 93.92 1850
    WQG5-15 67.42 2.47 15.66 0.04 0.22 0.04 4.07 0.43 1.51 91.85 1822
    WQG5-16 67.01 2.40 15.04 0.04 0.29 0.08 4.17 0.04 0.63 1.36 91.05 1762
    WQG5-17 68.38 2.74 16.31 0.02 0.72 0.08 2.38 0.16 0.49 1.51 92.77 1869
    WQG5-18.1 67.93 3.01 14.73 0.07 0.18 3.83 0.35 1.48 91.57 1697
    WQG5-18.2 69.37 2.84 15.78 0.04 0.89 0.04 2.29 0.83 1.50 93.56 1782
    WQG5-18.3 69.94 3.06 13.65 0.03 0.52 0.07 3.01 0.20 0.72 1.68 92.88 1528
    WQG5-18.4 68.52 2.73 15.47 0.04 0.28 0.04 3.17 0.09 0.55 1.21 92.09 1769
    WQG5-19 67.93 1.49 14.68 0.11 0.32 0.65 2.70 0.17 2.94 2.79 93.77 1705
    WQG5-20 71.85 2.11 15.46 0.06 1.11 3.49 1.62 0.10 0.13 1.09 97.02 1694
    WQG5-21.1 69.54 2.11 15.79 0.01 0.93 0.20 2.19 0.15 0.65 1.60 93.16 1786
    WQG5-21.2 69.22 1.91 15.61 0.82 0.29 2.25 0.03 0.77 1.48 92.38 1775
    WQG5-22 66.55 1.15 15.59 0.01 0.78 0.07 3.04 0.29 2.89 2.53 92.90 1851
    WQG5-23 66.47 2.69 15.21 0.02 0.21 0.23 4.22 0.11 0.59 1.30 91.04 1793
    WQG5-24 67.68 1.64 16.28 0.01 0.49 0.24 2.96 0.18 1.06 1.74 92.29 1896
    WQG5-25 67.27 2.52 14.48 0.04 0.20 0.32 4.11 0.10 0.39 0.99 90.42 1689
    WQG5-26 68.83 2.84 15.96 0.84 0.45 2.05 0.21 0.73 1.21 93.11 1816
    WQG5-27 69.39 2.69 15.84 0.38 0.07 2.75 0.15 0.56 1.48 93.29 1790
    WQG5-28 69.92 1.53 11.73 0.09 0.43 0.44 4.00 0.27 1.27 1.93 91.62 1324
    WQG5-29 66.34 2.84 14.95 0.02 0.19 0.04 3.95 0.46 1.53 90.31 1765
    WQG5-30 69.57 1.92 15.95 0.01 1.13 0.06 2.19 0.01 0.72 1.54 93.08 1805
    WQG5-31 66.83 2.69 15.06 0.19 0.24 3.93 0.03 0.42 1.19 90.56 1766
    WQG5-32 66.95 2.24 14.99 0.04 0.22 0.34 4.29 0.06 0.36 1.19 90.68 1760
    WQG5-33 67.50 2.41 15.65 0.20 0.03 4.20 0.20 0.42 1.33 91.94 1820
    WQG5-34.1 68.65 2.81 16.32 0.06 0.80 0.02 2.08 0.05 0.72 1.46 92.97 1863
    WQG5-34.2 66.60 2.64 15.11 0.02 0.18 0.03 4.20 0.06 0.29 1.02 90.13 1778
    WQG5-34.3 67.69 2.57 14.49 0.13 0.34 0.27 3.70 0.04 0.29 1.49 91.02 1679
    WQG5-34.4 63.76 2.48 13.81 1.77 0.33 1.15 3.33 0.30 0.52 1.27 88.71 1698
    GCL2-1 65.18 7.51 15.86 0.07 0.36 0.61 0.18 0.52 90.29 1858
    GCL2-2 64.39 7.95 15.53 0.02 0.10 0.30 0.72 0.11 0.71 89.83 1837
    GCL2-3 70.15 6.29 15.62 0.03 0.06 0.31 0.03 0.49 92.97 1715
    GCL2-4 69.44 7.32 15.80 0.04 0.03 0.04 0.21 0.17 0.02 0.52 93.58 1743
    GCL2-5 69.92 4.75 17.03 0.06 0.09 0.01 0.50 0.13 0.09 0.18 92.75 1891
    GCL2-6 70.47 5.21 15.84 0.05 0.07 0.02 0.50 0.11 0.21 92.48 1741
    GCL2-7 69.46 6.28 16.95 0.05 0.04 0.08 0.09 0.18 93.11 1879
    GCL2-8 69.18 6.70 16.84 0.05 0.08 0.33 0.11 93.27 1870
    GCL2-9 69.46 5.85 15.79 0.07 0.03 0.04 0.67 0.21 0.12 0.54 92.79 1755
    GCL2-10 67.61 7.35 16.44 0.04 0.02 0.02 0.27 0.06 0.17 0.35 92.33 1861
    GCL2-11 70.97 4.27 16.57 0.13 0.03 0.02 0.13 0.19 0.27 92.57 1817
    GCL2-12 68.81 5.56 16.32 0.08 0.27 0.21 0.22 0.53 92.00 1832
    GCL2-13 69.06 5.34 16.07 0.21 0.33 0.18 0.12 0.44 91.73 1800
    GCL2-14 65.22 5.18 14.67 0.03 1.09 0.16 0.16 0.43 86.93 1739
    注:“−”表示实验结果未达到检测限。
    下载: 导出CSV

    表  2   翁泉沟富蛇纹石磁铁矿石中晶质铀矿LA-ICP-MS法U-Pb同位素分析结果和对应电子探针测试点

    Table  2   LA-ICP-MS isotope dating results of uraninites of the serpentine-enriched magnetite ore from the Wengquangou deposit and corresponding EPMA analytical spots

    测点编号普通Pb
    含量
    207Pb/206Pb207Pb/235U206Pb/238U207Pb/206Pb206Pb/238U不谐和度
    (%)
    对应电子
    探针测点
    电子探针
    年龄
    (Ma)
    (μg/g)比值1σ比值1σ比值1σ年龄
    (Ma)
    1σ
    (Ma)
    年龄
    (Ma)
    1σ
    (Ma)
    WQG5-01 53.9 0.1154 0.0007 4.7798 0.0593 0.3000 0.0030 1887 11 1691 15 10.4 WQG5-1 1862
    WQG5-02 41.6 0.1150 0.0007 4.6733 0.0470 0.2953 0.0033 1880 16 1668 17 11.3 WQG5-2 1899
    WQG5-03 96.5 0.1143 0.0007 4.6626 0.0506 0.2967 0.0041 1869 11 1675 20 10.4 WQG5-9.2 1854
    WQG5-04 22.9 0.1116 0.0006 4.8099 0.0624 0.3129 0.0042 1826 9 1755 21 3.9 WQG5-9.1 1882
    WQG5-05 20.2 0.1110 0.0013 4.4265 0.0509 0.2920 0.0048 1816 22 1651 24 9.1 WQG5-10 1823
    WQG5-06 26.8 0.1145 0.0010 4.2651 0.0623 0.2706 0.0034 1872 17 1544 17 17.5 WQG5-11 1845
    WQG5-07 38.2 0.1127 0.0006 4.7316 0.0588 0.3047 0.0038 1844 9 1715 19 7.0 WQG5-12 1872
    WQG5-08 18.4 0.1119 0.0015 5.1489 0.0709 0.3358 0.0049 1831 24 1866 24 −1.9 WQG5-14.1 1860
    WQG5-09 13.0 0.1141 0.0010 5.6601 0.0810 0.3596 0.0042 1866 15 1980 20 −6.1 WQG5-14.2 1850
    WQG5-10 27.1 0.1120 0.0007 5.4790 0.0571 0.3548 0.0037 1832 10 1957 18 −6.8 WQG5-17 1869
    WQG5-11 52.0 0.1145 0.0009 4.9450 0.0636 0.3136 0.0040 1873 15 1758 20 6.1 WQG5-7 1786
    WQG5-12 60.3 0.1090 0.0007 4.5419 0.0625 0.3030 0.0046 1783 12 1706 23 4.3 WQG5-34.2 1778
    WQG5-13 107.0 0.1093 0.0007 4.9063 0.0836 0.3257 0.0055 1788 12 1818 27 −1.7 WQG5-34.3 1679
    WQG5-14 19.4 0.1091 0.0006 4.6320 0.0571 0.3079 0.0037 1784 9 1731 18 3.0 WQG5-16 1762
    WQG5-15 91.3 0.1082 0.0010 4.8412 0.0861 0.3245 0.0050 1769 18 1812 24 −2.4 WQG5-6 1749
    WQG5-16 35.8 0.1096 0.0008 4.8450 0.0550 0.3209 0.0036 1794 13 1794 18 0 WQG5-13.3 1752
    WQG5-17 53.3 0.1082 0.0007 4.5799 0.0523 0.3073 0.0037 1770 11 1727 18 2.4 WQG5-13.4 1790
    WQG5-18 49.5 0.1102 0.0007 4.5852 0.0578 0.3023 0.0038 1802 12 1703 19 5.5 WQG5-18.2 1782
    WQG5-19 63.7 0.1099 0.0007 4.5958 0.0546 0.3040 0.0036 1798 11 1711 18 4.8 WQG5-8.1 1785
    WQG5-20 35.9 0.1117 0.0007 4.2390 0.0521 0.2754 0.0033 1827 11 1568 17 14.2 WQG5-8.2 1828
    下载: 导出CSV
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