中国地质学会岩矿测试技术专业委员会、国家地质实验测试中心主办

粤北长江铀矿田花岗岩独居石U-Pb同位素定年及其地质意义

陈妍, 潘家永, 钟福军, 万建军, 严杰, 刘文泉, 李海东. 粤北长江铀矿田花岗岩独居石U-Pb同位素定年及其地质意义[J]. 岩矿测试, 2022, 41(1): 1-13. doi: 10.15898/j.cnki.11-2131/td.202103120038
引用本文: 陈妍, 潘家永, 钟福军, 万建军, 严杰, 刘文泉, 李海东. 粤北长江铀矿田花岗岩独居石U-Pb同位素定年及其地质意义[J]. 岩矿测试, 2022, 41(1): 1-13. doi: 10.15898/j.cnki.11-2131/td.202103120038
CHEN Yan, PAN Jia-yong, ZHONG Fu-jun, WAN Jian-jun, YAN Jie, LIU Wen-quan, LI Hai-dong. U-Pb Isotopic Dating of Monazite in Granite from the Changjiang Uranium Orefield, Northern Guangdong Province and Its Geological Significance[J]. Rock and Mineral Analysis, 2022, 41(1): 1-13. doi: 10.15898/j.cnki.11-2131/td.202103120038
Citation: CHEN Yan, PAN Jia-yong, ZHONG Fu-jun, WAN Jian-jun, YAN Jie, LIU Wen-quan, LI Hai-dong. U-Pb Isotopic Dating of Monazite in Granite from the Changjiang Uranium Orefield, Northern Guangdong Province and Its Geological Significance[J]. Rock and Mineral Analysis, 2022, 41(1): 1-13. doi: 10.15898/j.cnki.11-2131/td.202103120038

粤北长江铀矿田花岗岩独居石U-Pb同位素定年及其地质意义

  • 基金项目:
    国家自然科学基金项目(42002095,41862010,41772066);核资源与环境国家重点实验室自主基金项目(Z1906,2020Z08)
详细信息
    作者简介: 陈妍, 硕士研究生, 地质学专业。E-mail: 838794463@qq.com
    通讯作者: 潘家永, 博士, 教授, 主要从事矿床地球化学研究。E-mail: jypan@ecut.edu.cn
  • 中图分类号: P572

U-Pb Isotopic Dating of Monazite in Granite from the Changjiang Uranium Orefield, Northern Guangdong Province and Its Geological Significance

More Information
  • 长江铀矿田位于诸广山复式岩体中南部,是典型的花岗岩型铀矿田。前人采用锆石U-Pb定年方法对赋矿花岗岩进行了年代学研究,但由于全岩和锆石铀含量较高,锆石往往发生了蜕晶化,可能导致锆石U-Pb定年数据散乱,影响锆石U-Pb年龄的可靠性。独居石是花岗岩中广泛存在的含铀副矿物,铀和钍含量均较高,可达10000×10-6,普通铅含量低,约100×10-6~1000×10-6,是开展U-Pb定年的理想矿物。本文对长江铀矿田赋矿花岗岩中的独居石开展了激光剥蚀电感耦合等离子体质谱(LA-ICP-MS)U-Pb定年,分别选用独居石标准物质USGS44069和Trebilcock作为外部标样和监控标样,结果显示油洞岩体的独居石U-Pb年龄为228.0±1.5Ma(MSWD=0.82,n=23),长江岩体的独居石U-Pb年龄为156.8±1.7Ma(MSWD=0.76,n=14),与SHRIMP锆石年龄在误差范围内一致(分别为232±4Ma和160±2Ma),进一步证实了油洞岩体为印支晚期岩浆活动的产物,长江岩体为燕山早期岩浆活动的产物。因此,本研究认为高铀花岗岩中独居石U-Pb年龄可以有效地约束其成岩时代。

  • 加载中
  • 图 1  长江铀矿田地质简图(黄国龙等,2015)

    Figure 1. 

    图 2  长江岩体、油洞岩体花岗岩岩相学特征

    Figure 2. 

    图 3  油洞岩体中粗粒二云母花岗岩独居石BSE图像

    Figure 3. 

    图 4  长江岩体中粗粒黑云母花岗岩独居石BSE图像

    Figure 4. 

    图 5  油洞岩体、长江岩体花岗岩独居石谐和年龄及加权平均年龄图

    Figure 5. 

    图 6  不同测试矿物下油洞岩体和长江岩体年龄

    Figure 6. 

    表 1  LA-ICP-MS独居石U-Pb定年数据

    Table 1.  Ages of LA-ICP-MS U-Pb dating of monazite

    样品CJ1702-2:油洞岩体
    测点 207Pb/206Pb 207Pb/235U 206Pb/238U 207Pb/235U 206Pb/238U
    同位素比值 2σ 同位素比值 2σ 同位素比值 2σ 年龄(Ma) 2σ 年龄(Ma) 2σ
    CJ1702-2-01 0.0516 0.0016 0.2590 0.0062 0.0364 0.0003 233.9 9.0 230.7 7.2
    CJ1702-2-02 0.0531 0.0016 0.2673 0.0063 0.0365 0.0003 240.5 9.2 231.0 7.2
    CJ1702-2-03 0.0516 0.0046 0.2563 0.0174 0.0360 0.0005 231.7 17.2 228.2 7.4
    CJ1702-2-04 0.0511 0.0016 0.2551 0.0064 0.0362 0.0003 230.7 9.0 229.3 7.1
    CJ1702-2-05 0.0491 0.0029 0.2420 0.0109 0.0357 0.0004 220.0 11.9 226.4 7.3
    CJ1702-2-06 0.0523 0.0030 0.2534 0.0111 0.0352 0.0004 229.3 12.2 222.7 7.1
    CJ1702-2-07 0.0510 0.0023 0.2531 0.0090 0.0360 0.0004 229.1 10.7 228.0 7.3
    CJ1702-2-08 0.0523 0.0023 0.2581 0.0086 0.0358 0.0003 233.2 10.4 226.9 7.1
    CJ1702-2-09 0.0512 0.0029 0.2560 0.0112 0.0363 0.0004 231.4 12.2 229.7 7.4
    CJ1702-2-10 0.0522 0.0040 0.2584 0.0152 0.0359 0.0005 233.4 15.4 227.5 7.6
    CJ1702-2-11 0.0524 0.0023 0.2592 0.0088 0.0359 0.0003 234.0 10.6 227.3 7.1
    CJ1702-2-12 0.0505 0.0027 0.2528 0.0101 0.0363 0.0003 228.8 11.4 229.8 7.2
    CJ1702-2-13 0.0518 0.0016 0.2585 0.0064 0.0362 0.0003 233.5 9.1 229.1 7.1
    CJ1702-2-14 0.0498 0.0026 0.2511 0.0098 0.0365 0.0003 227.4 11.2 231.3 7.3
    CJ1702-2-16 0.0519 0.0050 0.2633 0.0194 0.0368 0.0006 237.3 18.8 232.9 8.0
    CJ1702-2-20 0.0518 0.0039 0.2544 0.0146 0.0356 0.0004 230.1 14.9 225.7 7.3
    CJ1702-2-21 0.0526 0.0019 0.2561 0.0071 0.0353 0.0003 231.5 9.5 223.6 7.0
    CJ1702-2-22 0.0545 0.0030 0.2666 0.0116 0.0355 0.0005 239.9 12.7 224.7 7.5
    CJ1702-2-25 0.0520 0.0028 0.2619 0.0108 0.0365 0.0005 236.2 12.1 231.1 7.5
    CJ1702-2-26 0.0496 0.0022 0.2380 0.0081 0.0348 0.0003 216.8 9.8 220.7 6.9
    CJ1702-2-27 0.0503 0.0021 0.2494 0.0081 0.0360 0.0003 226.1 10.0 227.7 7.2
    CJ1702-2-28 0.0537 0.0028 0.2746 0.0112 0.0371 0.0004 246.4 12.5 234.6 7.5
    CJ1702-2-30 0.0498 0.0018 0.2480 0.0071 0.0361 0.0003 225.0 9.4 228.7 7.2
    样品CJ1607:长江岩体
    测点 207Pb/206Pb 207Pb/235U 206Pb/238U 207Pb/235U 206Pb/238U
    同位素比值 2σ 同位素比值 2σ 同位素比值 2σ 年龄(Ma) 2σ 年龄(Ma) 2σ
    CJ1607-01 0.0419 0.0051 0.1484 0.0150 0.0257 0.0006 140.5 14.8 163.6 6.4
    CJ1607-02 0.0526 0.0059 0.1756 0.0166 0.0242 0.0007 164.3 16.3 154.3 6.2
    CJ1607-03 0.0412 0.0054 0.1427 0.0154 0.0251 0.0007 135.5 15.2 160.0 6.4
    CJ1607-05 0.0506 0.0070 0.1767 0.0206 0.0253 0.0009 165.2 19.9 161.1 7.5
    CJ1607-06 0.0409 0.0063 0.1370 0.0174 0.0243 0.0006 130.4 17.0 154.7 6.2
    CJ1607-07 0.0494 0.0053 0.1649 0.0149 0.0242 0.0006 155.0 14.8 154.2 6.2
    CJ1607-08 0.0552 0.0058 0.1854 0.0161 0.0243 0.0006 172.7 15.9 155.0 5.9
    CJ1607-09 0.0436 0.0055 0.1491 0.0155 0.0248 0.0007 141.1 15.3 158.0 6.5
    CJ1607-10 0.0467 0.0060 0.1589 0.0169 0.0247 0.0007 149.8 16.5 157.2 6.4
    CJ1607-11 0.0501 0.0062 0.1694 0.0174 0.0245 0.0007 158.9 17.0 156.2 6.4
    CJ1607-12 0.0539 0.0078 0.1800 0.0216 0.0242 0.0007 168.1 20.8 154.4 6.6
    CJ1607-13 0.0748 0.0081 0.2527 0.0228 0.0245 0.0006 228.8 21.7 156.0 6.0
    CJ1607-14 0.0601 0.0069 0.2028 0.0194 0.0245 0.0006 187.5 18.8 155.9 6.2
    CJ1607-15 0.0505 0.0065 0.1710 0.0182 0.0246 0.0007 160.3 17.7 156.5 6.3
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出版历程
收稿日期:  2021-03-12
修回日期:  2021-08-04
录用日期:  2021-09-21
刊出日期:  2022-01-28

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