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向阳坪铀矿床沥青铀矿微区原位LA-ICP-MS U-Pb年龄及稀土元素特征

李杰 黄宏业 刘子杰 张涛 陈琪 邹明亮

李杰, 黄宏业, 刘子杰, 张涛, 陈琪, 邹明亮. 向阳坪铀矿床沥青铀矿微区原位LA-ICP-MS U-Pb年龄及稀土元素特征[J]. 地质科技通报, 2021, 40(1): 90-99. doi: 10.19509/j.cnki.dzkq.2021.0011
引用本文: 李杰, 黄宏业, 刘子杰, 张涛, 陈琪, 邹明亮. 向阳坪铀矿床沥青铀矿微区原位LA-ICP-MS U-Pb年龄及稀土元素特征[J]. 地质科技通报, 2021, 40(1): 90-99. doi: 10.19509/j.cnki.dzkq.2021.0011
Li Jie, Huang Hongye, Liu Zijie, Zhang Tao, Cheng Qi, Zou Mingliang. In-situ U-Pb dating of pitchblende and the REE characteristics using LA-ICP-MS in Xiangyangping uranium deposit[J]. Bulletin of Geological Science and Technology, 2021, 40(1): 90-99. doi: 10.19509/j.cnki.dzkq.2021.0011
Citation: Li Jie, Huang Hongye, Liu Zijie, Zhang Tao, Cheng Qi, Zou Mingliang. In-situ U-Pb dating of pitchblende and the REE characteristics using LA-ICP-MS in Xiangyangping uranium deposit[J]. Bulletin of Geological Science and Technology, 2021, 40(1): 90-99. doi: 10.19509/j.cnki.dzkq.2021.0011

向阳坪铀矿床沥青铀矿微区原位LA-ICP-MS U-Pb年龄及稀土元素特征

doi: 10.19509/j.cnki.dzkq.2021.0011
基金项目: 

国家自然科学基金项目 41702102

中国核工业集团有限公司项目 3210402

详细信息
    作者简介:

    李杰(1991-), 男, 工程师, 主要从事铀矿地质勘查与科研工作。E-mail:lijie568521@qq.com

    通讯作者:

    邹明亮(1983-), 男, 高级工程师, 主要从事铀成矿作用研究。E-mail:zoumingliang2001@163.com

  • 中图分类号: P619.14

In-situ U-Pb dating of pitchblende and the REE characteristics using LA-ICP-MS in Xiangyangping uranium deposit

  • 摘要: 向阳坪矿床作为苗儿山矿田近年来新发现的花岗岩型铀矿床,发育大量原生沥青铀矿脉。为了进一步厘清铀矿床铀成矿年龄体系,采用LA-ICP-MS测试技术,对钻孔中揭露的脉状沥青铀矿开展了微区原位U-Pb同位素定年及稀土元素特征研究。LA-ICP-MS分析结果显示,向阳坪地区存在2期铀矿化,U-Pb年龄为51.59 Ma和41.10 Ma,前者为向阳坪矿床主成矿年龄,后者为后期流体活动导致沥青铀矿蚀变的热事件时间,分别与沙子江矿床主成矿期65~50 Ma、45~40 Ma相吻合。沥青铀矿稀土元素特征表明,稀土元素总量相对较高,具有明显的负Eu异常,其配分模式呈海鸥型,与低-高品位铀矿石的稀土元素配分模式相似,而与新鲜花岗岩、蚀变花岗碎裂岩的"右倾型"相区别。沥青铀矿稀土元素与铀元素的迁移具有同步性,为低温下晶出沉淀的产物。

     

  • 图 1  苗儿山大地构造位置图(a)(据文献[7])和豆乍山(b)、向阳坪矿床(c)地质简图

    1.第四系;2.泥盆系-白垩系;3.元古界-志留系;4.元古界;5.中生代花岗岩;6.古生代花岗岩;7.燕山晚期第一阶段细粒白云母花岗岩;8.燕山早期第三阶段细粒含斑二云母花岗岩;9.印支晚期中细粒二云母花岗岩;10.印支期中粒黑云母花岗岩;11.加里东期粗粒斑状黑云母花岗岩;12.细粒花岗岩脉;13.花岗斑岩脉;14.断裂及编号;15.地质界线;16.产状;17.采样位置

    Figure 1.  Tectonic skematic map showing the position of Miaoershan (a) and geological sketch of Douzhashan uranium deposit (b) and Xiangyangping uranium deposit (c)

    图 2  含沥青铀矿脉花岗碎裂岩(a,b)和沥青铀矿脉背散射电子图像(c)

    Figure 2.  Pitchblende vein granitic cataclastic rock(a, b) and BSE image of pitchblende vein(c)

    图 3  沥青铀矿206Pb/238U表观年龄与Pb总量关系图

    Figure 3.  The relationship between the apparent 206Pb/238U age and total Pb of pitchblende

    图 4  沥青铀矿LA-ICP-MS U-Pb年龄谐和图和206Pb/238U加权年龄平均图

    Figure 4.  Concordia diagrams of LA-ICP-MS U-Pb and the weighted age average diagrams of 206Pb/238U dating of pitchblende

    图 5  沥青铀矿稀土元素球粒陨石标准化分布型式图(3种铀矿类型引自文献[25])

    Figure 5.  Chondrite-normalized REE patterns of pitchblende

    图 6  不同类型岩石稀土元素球粒陨石标准化分布模式图

    Figure 6.  Chondrite-normalized REE patterns of different types of rocks

    图 7  华南典型铀矿床(a)和沙子江铀矿床(b)沥青铀矿年龄直方图

    Figure 7.  Age histogram of pitchblende in typical uranium ore deposits in south China (a) and Shazijiang uranium deposit (b)

    图 8  向阳坪铀矿床沥青铀矿ΣREE-(ΣLREE/ΣHREE)N图解(底图据文献[25])

    Figure 8.  ΣREE-(ΣLREE/ΣHREE)N diagram of pitchblende from Xiangyangping uranium deposit

    表  1  向阳坪矿床沥青铀矿U-Pb同位素分析结果

    Table  1.   U-Pb isotopic composition of pitchblende from Xiangyangping uranium deposit

    编号 U-Pb同位素比值 U-Pb同位素年龄/Ma
    207Pb/235U 206Pb/238U 207Pb/235U 206Pb/238U
    3-01 0.073 8 0.001 1 0.007 9 0.000 1 72.31 1.04 50.60 0.67
    3-04 0.062 1 0.001 5 0.006 7 0.000 1 61.16 1.43 42.98 0.83
    3-05 0.056 4 0.001 3 0.006 7 0.000 1 55.75 1.30 42.94 0.82
    3-06 0.068 7 0.000 9 0.007 9 0.000 1 67.43 0.86 50.53 0.53
    3-07 0.068 2 0.000 7 0.008 1 0.000 1 66.97 0.71 51.82 0.50
    3-08 0.068 2 0.000 8 0.007 8 0.000 1 67.04 0.81 50.23 0.49
    3-09 0.074 1 0.000 7 0.008 2 0.000 1 72.54 0.66 52.68 0.46
    3-10 0.072 5 0.002 0 0.008 1 0.000 2 71.11 1.93 51.91 1.32
    3-11 0.066 2 0.001 1 0.006 6 0.000 1 65.10 1.05 42.54 0.57
    3-12 0.073 2 0.000 9 0.008 1 0.000 1 71.74 0.87 51.85 0.46
    3-13 0.071 7 0.000 8 0.008 1 0.000 1 70.27 0.79 51.97 0.57
    3-14 0.059 0 0.000 7 0.006 6 0.000 1 58.20 0.66 42.16 0.42
    3-15 0.069 1 0.001 0 0.007 9 0.000 1 67.85 0.91 50.44 0.57
    3-17 0.073 0 0.001 2 0.008 1 0.000 1 71.53 1.10 51.99 0.73
    3-18 0.059 6 0.001 1 0.006 6 0.000 1 58.82 1.04 42.66 0.69
    3-20 0.054 7 0.000 6 0.006 5 0.000 1 54.11 0.57 41.67 0.39
    3-29 0.075 5 0.000 7 0.008 2 0.000 1 73.89 0.68 52.96 0.49
    下载: 导出CSV

    表  2  向阳坪矿床沥青铀矿稀土元素分析结果

    Table  2.   REE composition of pitchblende from Xiangyangping uranium deposits

    点号 3-01 3-04 3-05 3-06 3-07 3-08 3-09 3-10 3-11 3-12 3-13 3-14 3-15 3-17 3-18 3-20 3-29
    La 147.00 155.10 29.31 36.62 26.99 41.37 59.18 40.15 113.26 73.71 71.94 94.10 76.29 43.60 95.51 97.25 55.06
    Ce 352.53 276.68 62.30 104.94 75.57 130.17 170.10 121.33 235.89 157.41 135.77 145.57 135.10 93.90 80.20 98.35 165.81
    Pr 36.35 34.35 8.48 12.08 8.61 14.42 19.52 13.30 29.22 18.83 16.12 16.00 15.02 10.51 9.92 9.21 19.41
    Nd 165.04 146.49 45.42 51.12 39.19 79.91 110.77 63.83 133.17 78.16 73.83 71.75 81.12 50.56 34.82 50.88 98.34
    Sm 60.19 33.29 18.64 17.36 15.16 31.38 42.96 27.87 52.29 33.43 25.51 31.11 30.93 14.17 11.11 15.09 39.32
    Eu 2.29 2.17 0.82 0.76 0.83 1.73 2.26 1.48 2.86 1.97 1.41 1.36 1.80 1.11 0.67 0.96 2.13
    Gd 85.58 67.02 74.50 49.04 43.45 68.99 80.90 69.19 95.16 67.30 44.38 44.42 55.38 47.41 37.50 27.63 86.73
    TbwB/10-6 13.29 10.01 7.48 6.66 4.37 11.55 11.03 10.75 15.23 10.98 8.70 8.43 7.53 7.42 4.75 5.95 14.14
    Dy 77.97 74.20 34.57 35.30 26.48 61.85 62.47 53.69 76.38 56.19 44.06 38.56 43.05 36.21 23.96 25.37 66.23
    Ho 14.34 18.91 13.36 11.13 6.89 13.35 13.89 10.89 15.94 12.31 11.27 9.23 9.90 7.47 6.91 8.09 16.65
    Er 41.16 34.40 20.14 26.13 18.17 36.22 39.16 33.52 43.43 33.84 26.96 22.33 25.73 23.93 17.18 18.26 40.23
    Tm 6.05 5.79 2.14 4.31 2.37 6.08 5.51 5.35 6.89 4.36 3.97 3.14 4.47 3.09 2.42 3.23 5.78
    Yb 63.71 51.92 33.63 29.46 17.55 40.54 34.95 36.95 48.15 32.58 26.98 30.42 25.14 23.40 12.21 20.26 41.81
    Lu 7.08 5.83 4.12 2.78 2.87 4.91 4.71 4.15 5.83 4.36 3.73 3.93 4.34 3.50 2.96 2.86 7.81
    Y 673.15 527.36 436.54 425.43 320.31 549.58 554.65 544.31 622.00 513.05 418.48 374.52 439.17 432.89 348.80 382.50 565.37
    ΣREE 1 072.57 916.15 354.91 387.68 288.50 542.50 657.39 492.44 873.69 585.43 494.62 520.35 515.79 366.27 340.11 383.40 659.46
    LREE 763.40 648.07 164.97 222.89 166.35 298.98 404.78 267.95 566.69 363.51 324.58 359.88 340.25 213.84 232.22 271.74 380.08
    HREE 309.17 268.07 189.94 164.79 122.15 243.52 252.61 224.49 307.00 221.92 170.04 160.47 175.53 152.43 107.89 111.65 279.38
    LREE/HREE 2.47 2.42 0.87 1.35 1.36 1.23 1.60 1.19 1.85 1.64 1.91 2.24 1.94 1.40 2.15 2.43 1.36
    (La/Yb)N 1.66 2.14 0.63 0.89 1.10 0.73 1.21 0.78 1.69 1.62 1.91 2.22 2.18 1.34 5.61 3.44 0.94
    (La/Sm)N 1.58 3.01 1.02 1.36 1.15 0.85 0.89 0.93 1.40 1.42 1.82 1.95 1.59 1.99 5.55 4.16 0.90
    δEu 0.10 0.14 0.07 0.08 0.10 0.11 0.12 0.10 0.12 0.13 0.13 0.11 0.13 0.13 0.10 0.14 0.11
    δCe 1.18 0.93 0.97 1.22 1.22 1.31 1.23 1.29 1.01 1.04 0.98 0.92 0.98 1.08 0.64 0.81 1.24
    TE1, 3 1.01 0.87 0.70 0.91 0.86 1.01 0.92 1.03 0.95 0.97 0.93 0.89 0.82 0.94 0.70 0.73 0.97
    下载: 导出CSV
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