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赣西北洞上铀矿床产铀花岗岩的时代、岩石地球化学特征及其地质意义

党飞鹏 吕川 唐湘生 张勇 肖志斌 李志鹏 汤君阳 张涛

党飞鹏,吕川,唐湘生,等,2023. 赣西北洞上铀矿床产铀花岗岩的时代、岩石地球化学特征及其地质意义[J]. 地质力学学报,29(6):898−914 doi: 10.12090/j.issn.1006-6616.2023028
引用本文: 党飞鹏,吕川,唐湘生,等,2023. 赣西北洞上铀矿床产铀花岗岩的时代、岩石地球化学特征及其地质意义[J]. 地质力学学报,29(6):898−914 doi: 10.12090/j.issn.1006-6616.2023028
DANG F P,LYU C,TANG X S,et al.,2023. Geochronology and petrogeochemical characteristics of U-bearing granites in the Dongshang deposit, northwestern Jiangxi, China and its geological significance[J]. Journal of Geomechanics,29(6):898−914 doi: 10.12090/j.issn.1006-6616.2023028
Citation: DANG F P,LYU C,TANG X S,et al.,2023. Geochronology and petrogeochemical characteristics of U-bearing granites in the Dongshang deposit, northwestern Jiangxi, China and its geological significance[J]. Journal of Geomechanics,29(6):898−914 doi: 10.12090/j.issn.1006-6616.2023028

赣西北洞上铀矿床产铀花岗岩的时代、岩石地球化学特征及其地质意义

doi: 10.12090/j.issn.1006-6616.2023028
基金项目: 国家自然科学基金项目(42062006,42273028); 核资源与环境国家重点实验室开放基金项目(2020NRE08);中国核工业地质局项目(202231,202028-2)
详细信息
    作者简介:

    党飞鹏(1986-),男,硕士,高级工程师,从事铀矿地质找矿勘查与研究。E-mail:feipengdang@163.com

    通讯作者:

    张勇(1983-),男,博士,副教授,从事铀矿地质教学与科研工作。E-mail:zhycy2004@163.com

  • 中图分类号: P58;P534.51

Geochronology and petrogeochemical characteristics of U-bearing granites in the Dongshang deposit, northwestern Jiangxi, China and its geological significance

Funds: This research is financially supported by the National Natural Science Foundation of China (Grants No. 42062006 and 42273028), the Open-access Fund of the State Key Laboratory of Nuclear Resources and Environment(Grant No. 2020NRE08), and the Project of the China Nuclear Geology (Grants No. 202231 and 202028-2)
  • 摘要:

    洞上铀矿床位于赣西北九岭岩基南部甘坊岩体内,产铀花岗岩以中粗粒斑状黑(二)云母花岗岩为主。通过锆石及独居石U–Pb年代学、岩相学和岩石地球化学研究,确定产铀花岗岩的形成时代、源区属性与岩石成因,探讨其铀成矿潜力。LA–ICP–MS分析结果显示,锆石U–Pb下交点年龄和加权平均年龄均为152±1 Ma,独居石U-Pb下交点年龄和加权平均年龄分别为151±1 Ma和151±2 Ma,表明产铀花岗岩形成于燕山早期。主量元素具有高硅(SiO2含量为72.1%~75.6%)、高碱(K2O+Na2O含量为7.26%~8.43%)、富钾贫钠(K2O/Na2O=1.07~1.42)、高铝(A/CNK=1.12~1.29)、低钛(TiO2含量为0.07%~0.17%)、贫铁镁(FeOT含量为0.75%~1.28%、MgO含量为0.19%~0.31%)特征,属高钾钙碱性系列过铝质花岗岩;微量元素Ba、Sr、Nb、Ti亏损,Rb、U、Pb、Ta富集,属典型的低Ba、Sr花岗岩;稀土总量较低(∑REE=21.6×10−6~50.7×10−6),配分曲线为右倾的轻稀土富集型,Eu负异常明显,属S型花岗岩。结合年代学和岩石地球化学特征,认为洞上产铀花岗岩形成于燕山早期同碰撞造山的主挤压阶段,是新元古界双桥山群安乐林组富白云母的变泥质岩部分熔融的产物。富铀、Rb/Sr比值高、Th/U比值小于3、锆石铀含量高等特征指示该花岗岩为产铀花岗岩,具有提供铀源的条件与潜力。

     

  • 图  1  九岭地区大地构造位置及铀矿地质简图

    1—第四系;2—古近系;3—上白垩统;4—奥陶系;5—寒武系;6—下南华统;7—新元古界双桥山群;8—晋宁期花岗岩;9—燕山早期第一阶段花岗岩;10—燕山早期第二阶段花岗岩;11—燕山晚期花岗岩;12—细晶岩脉、花岗斑岩脉;13—推滑覆断层、剥离断层;14—断裂构造;15—不整合界线;16—地质界线;17—岩相界线;18—铀矿床及名称a—大地构造位置简图(张勇,2018);b—铀矿地质简图

    Figure  1.  Geotectonic location map and uranium geological map of Jiuling area

    (a) Geotectonic location map (Zhang, 2018); (b) Uranium geological map 1–Quaternary; 2–Paleogene; 3–Upper Cretaceous; 4–Ordovician; 5–Cambrian; 6–Lower Nanhuan System; 7–Neoproterozoic Shuangqiaoshan Group; 8–Granite of Jinning Period; 9–Granite of first stage in Early Yanshanian; 10–Granite of second stage in Early Yanshanian; 11–Granite of Late Yanshanian; 12–fine-grain dike or ranite-porphyry vein; 13–nappe structure; 14–fault structure; 15–unconformity; 16–geological boundary; 17–lithologic interface; 18–uranium deposit

    图  2  洞上地区铀矿地质简图(据周建廷等,2011;秦程,2018修编)

    1—新元古界双桥山群;2—晋宁期花岗闪长岩;3—晋宁期二长花岗岩;4—燕山早期第一阶段花岗岩;5—燕山早期第二阶段花岗岩;6—燕山晚期第一阶段花岗岩;7—细晶岩脉、花岗斑岩脉;8—断裂构造;9—地质界线、岩相界线;10—铀矿床及名称;11—取样位置及编号

    Figure  2.  Uranium geological map of Dongshang deposit(modified after Zhou et al., 2011; Qin, 2018

    1–Neoproterozoic Shuangqiaoshan Group; 2–granodiorite of Jinning Period; 3–monzonitic granite of Jinning Period; 4–granite of first stage in Early Yanshanian; 5–granite of second stage in Early Yanshanian; 6–granite of Late Yanshanian; 7–fine-grain dike or ranite-porphyry vein; 8–fault structure; 9–geological boundary or lithologic interface; 10–uranium deposit; 11–sampling point and number

    图  3  洞上产铀花岗岩岩石学特征

    Qtz—石英;Pl—斜长石;Ms—白云母;Chl—绿泥石;Kfs—钾长石a—浅肉红色中粗粒斑状黑(二)云母花岗岩;b—似斑状结构,图中石英斑晶超出视域(+);c—斜长石被白云母交代,绿泥石呈黑云母假晶(+);d—绿泥石和白云母组成黑云母的假晶(+);e—野外露头,发育钾长石化、褐铁矿化;f—岩石手标本,见钾长石化、水云母化

    Figure  3.  Petrological characteristics of the U-bearing granite in Dongshang deposit

    (a) medium-coarse biotite granite; (b) orphyritic texture (+); (c) muscovitize (+); (d) chloritization and muscovitize (+); (e) K-alferation and ferritization of geological outcrop; (f) K-alferation and hydromicazation of hand specimens

    图  4  洞上产铀花岗岩CL图像、测点位置及206Pb/238U视年龄值

    Figure  4.  CL images,analysis point and 206Pb/238U apparent ages of the U-bearing granite in Dongshang deposit

    图  5  洞上产铀花岗岩锆石U–Pb谐和图和加权平均206Pb/238U年龄图

    Figure  5.  Concordia diagrams of the zircon U–Pb dating and weighted mean diagrams of 206Pb/238U apparent ages for the U-bearing granite in Dongshang deposit

    图  6  洞上产铀花岗岩独居石U–Pb谐和图和加权平均206Pb/238U年龄图

    Figure  6.  Concordia diagrams of the monazite U–Pb dating and weighted mean diagrams of 206Pb/238U apparent ages for the U-bearing granite in Dongshang deposit

    图  7  洞上产铀花岗岩主量元素图解

    JL数据为文中分析结果,GF数据引自王迪(2017)a—SiO2−(K2O+Na2O)图(Middlemost,1994);b—SiO2−K2O图(Peccerillo and Taylor,1976);c—A/CNK−ANK图(Maniar and Piccoli,1989);d—SiO2−P2O5

    Figure  7.  Main element diagrams of the U-bearing granite in Dongshang deposit

    (a) SiO2–(K2O+Na2O) diagram (Middlemost, 1994); (b)SiO2–K2O diagram (Peccerillo and Taylor, 1976); (c) A/CNK–ANK diagram (Maniar and Piccoli, 1989); (d) SiO2–P2O5 diagram The JL data was analyzed for this article; The GF data was quoted from Wang (2017).

    图  8  洞上产铀花岗岩微量元素原始地幔标准化蛛网图及稀土元素球粒陨石标准化配分曲线(标准化数值引自Sun and McDonough (1989))

    JL数据为此研究分析结果,GF数据引自王迪(2017)a—微量元素原始地幔标准化蛛网图;b—稀土元素球粒陨石标准化配分曲线

    Figure  8.  Primitive mantle-normalized trace element spider diagram and chondrite-normalized REE distribution pattern of the U-bearing granite in Dongshang deposit (normalized values after Sun and McDonough(1989))

    (a) Primitive mantle-normalized trace element spider diagram; (b) Chondrite-normalized REE distribution patternThe JL data was analyzed for this article; The GF data was quoted from Wang (2017).

    图  9  洞上产铀花岗岩岩石类型判别图解

    FG—酸性花岗岩;OGT—未发生分异花岗岩;JL数据为文中分析结果,GF数据引自王迪(2017)a—(Zr+Nb+Ce+Y)−((K2O+Na2O)/Ca2O)图解(底图引自Whalen et al.(1987));b—(Zr+Ce+Y)−(Rb/Ba)图解(底图引自Whalen et al.(1987)

    Figure  9.  Discrimination diagrams for the rock-type of the U-bearing granite in Dongshang deposit

    (a) (Zr+Nb+Ce+Y)–((K2O+Na2O)/Ca2O) diagram (Schema from Whalen et al.(1987)); (b) (Zr+Ce+Y)–(Rb/Ba) diagram (Schema from Whalen et al.(1987))

    图  10  洞上产铀花岗岩源区属性判别图解

    JL数据为文中分析结果,GF数据引自王迪(2017)a—Rb/Sr−Rb/Ba图解(底图引自Sylvester(1998));b—NK/MFT−NKMFT图解(底图引自Lee et al.(2003)

    Figure  10.  Discrimination diagrams for the source characteristics of the U-bearing granite in Dongshang deposit

    (a) Rb/Sr–Rb/Ba diagram (Schema from Sylvester (1998)); (b) NK/MFT–NKMFT diagram (Schema from Lee et al. (2003))

    图  11  洞上产铀花岗岩构造环境判别图解

    syn-COLG—同碰撞花岗岩;WPG—板内花岗岩;post-COLG—后碰撞花岗岩;VAG—火山弧花岗岩;ORG—洋脊花岗岩;JL数据为文中分析结果,GF数据引自王迪(2017)a—Rb–(Y+Nb)图解(底图引自Pearce(1996));b—Ta–Yb图解(底图引自Pearce(1996)

    Figure  11.  Discrimination diagrams for the tectonic environment of the U-bearing granite in Dongshang deposit

    (a) Rb–(Y+Nb) diagram (Schema from Pearce (1996)); (b)Ta–Yb diagram (Schema from Pearce (1996))

    图  12  花岗岩与源岩关系图

    图中源区划分引自Sylvester(1998);产铀、非产铀和过渡型花岗岩区划分引自兰鸿锋等(2016);JL数据为文中分析结果,GF数据引自王迪(2017),打鼓寨岩体数据引自徐勋胜等(2021),长江岩体数据引自田泽瑾(2014

    Figure  12.  Relation diagram of granite and source rock

    表  1  洞上产铀花岗岩锆石LA–ICP–MS U–Pb定年分析结果

    Table  1.   Data of LA–ICP–MS zircon U–Pb dating of the U-bearing granite in Dongshang deposit

    测点号含量/(×10−6同位素比值年龄/Ma
    PbThU207Pb/206Pb1σ207Pb/235U1σ206Pb/238U1σ207Pb/206Pb1σ207Pb/235U1σ206Pb/238U1σ
    JL2020-7-02162376910.05110.00100.17150.00350.02440.00022444016131551
    JL2020-7-033953158900.05070.00030.16760.00130.02400.00012271615711531
    JL2020-7-055879221400.05200.00050.17070.00250.02380.00032872216021522
    JL2020-7-08284345100.04990.00130.16420.00390.02390.00021925015431521
    JL2020-7-11127198037000.05640.00090.19100.00400.02450.00024703317731562
    JL2020-7-13152346320.04840.00210.16000.00700.02400.00051188515161533
    JL2020-7-15141927250.04880.00080.16010.00260.02380.00021393315121521
    JL2020-7-1680102233800.05310.00090.17760.00290.02430.00023323616631551
    JL2020-7-17222956070.04930.00090.16110.00310.02370.00021633815231511
    JL2020-7-18141322700.06600.00270.22400.00950.02460.00038058520581572
    JL2020-7-19121792250.05030.00160.16350.00490.02360.00032076015451502
    JL2020-7-2081111960.05140.00170.17000.00550.02400.00022606015951531
    JL2020-7-23263845230.04850.00140.15910.00460.02380.00021236015041521
    JL2020-7-253749446800.05230.00070.17250.00250.02390.00032983116221522
    JL2020-7-28101021350.06960.00320.23900.00900.02490.00089179521881595
    JL2020-7-31233103610.05770.00150.19500.00500.02450.00035205518141562
    JL2020-7-32284189090.04960.00080.16290.00270.02380.00021773415321521
    JL2020-7-33243087200.04980.00100.16410.00340.02390.00021874215431521
    JL2020-7-34213253600.05080.00170.16700.00550.02390.00032316515751522
    JL2020-7-35111253330.05170.00290.16800.00950.02360.000327312015891502
    JL2020-7-36112156034800.05620.00100.18830.00290.02430.00044613617531552
    JL2020-7-374345832600.05360.00280.17800.00950.02410.000735312016681544
    JL2020-7-39131671680.05440.00320.17700.01000.02360.000538612016591503
    JL2020-7-40161964920.05100.00170.16900.00550.02400.00032417015951532
    JL2020-7-43182767610.04910.00080.16170.00260.02390.00021513315221521
    JL2020-7-50263412290.05200.00260.17400.01000.02430.000428611016391553
    JL2020-7-514050415500.05900.00120.19810.00370.02440.00025674618431551
    JL2020-7-53282852470.06060.00370.20300.01200.02430.0006625125188101553
    JL2020-7-542026550500.05170.00070.17110.00310.02400.00032723116031532
    下载: 导出CSV

    表  2  洞上产铀花岗岩独居石LA–ICP–MS U–Pb定年分析结果

    Table  2.   Data of LA–ICP–MS monaite U–Pb dating of the U-bearing granite in Dongshang deposit

    测点号含量/(×10−6同位素比值年龄/Ma
    ThU207Pb/235U2σ206Pb/238U2σ207Pb/235U2σ206Pb/238U2σ
    JLD2020-7-01191064113050.15300.00950.02300.000714581475
    JLD2020-7-0317626778050.15920.00960.02440.000715081565
    JLD2020-7-0417980838330.17940.01760.02410.0008168151535
    JLD2020-7-0517909496680.15890.00950.02390.000715081525
    JLD2020-7-0721755438840.15910.01320.02360.0007150121515
    JLD2020-7-0918541078910.17330.01030.02400.000816291535
    JLD2020-7-1018551164570.15120.00860.02370.000714381515
    JLD2020-7-13187573104230.15920.00880.02330.000615081484
    JLD2020-7-1516167668010.15860.01230.02420.0007149111545
    JLD2020-7-1618139763350.16160.00960.02420.000715281545
    JLD2020-7-1788445123000.15500.00890.02350.000714681504
    JLD2020-7-1818258571280.16110.01040.02370.000615291514
    JLD2020-7-1918076259640.16890.01320.02400.0007158111535
    JLD2020-7-2118751291020.15720.00960.02350.000614881504
    JLD2020-7-24131495272310.14760.00690.02290.000714061464
    JLD2020-7-02104575137480.43020.03490.02730.0009363251746
    JLD2020-7-1123124023920.89410.11810.03140.0013649631998
    JLD2020-7-2017750352590.76700.11350.03040.0014578651939
    JLD2020-7-2217681248650.21690.01600.02460.0008199131565
    下载: 导出CSV

    表  3  洞上产铀花岗岩主量元素(%)、微量元素(×10−6)及稀土元素(×10−6)分析结果

    Table  3.   The analytical results major elements (%), trace elements (×10−6) and REEs (×10−6) of the U-bearing granite in Dongshang deposit

    样号JL2020-6JL2020-7JL2020-8GF8-1GF9-1GF10-1GF11-1
    元素中粗粒斑状黑(二)云母花岗岩粗粒白云母花岗岩
    SiO2 72.14 73.01 72.51 75.40 73.70 75.00 75.60
    TiO2 0.15 0.16 0.16 0.13 0.16 0.17 0.07
    Al2O3 15.17 14.93 14.97 13.50 14.30 14.00 13.60
    FeOT 1.28 1.13 1.27 0.85 1.02 1.20 0.75
    MnO 0.07 0.06 0.08 0.04 0.03 0.08 0.50
    MgO 0.27 0.23 0.25 0.25 0.31 0.30 0.19
    CaO 0.72 0.76 0.72 0.47 0.43 0.54 0.74
    Na2O 3.78 3.82 3.55 3.47 3.36 3.51 3.78
    K2O 4.65 4.44 4.49 4.01 4.77 3.75 4.25
    P2O5 0.23 0.25 0.24 0.25 0.26 0.28 0.26
    LOI 1.13 1.15 1.03 0.77 0.77 0.96 1.55
    总量 99.60 99.96 99.30 99.10 99.60 99.76 100.76
    K2O+Na2O 8.43 8.26 8.04 7.48 8.13 7.26 8.03
    K2O/Na2O 1.23 1.16 1.26 1.16 1.42 1.07 1.12
    CaO/Na2O 0.19 0.20 0.20 0.14 0.13 0.15 0.20
    Al2O3/TiO2 101.13 93.31 93.56 103.85 89.38 82.35 194.29
    A/CNK 1.21 1.20 1.25 1.24 1.25 1.29 1.12
    A/NK 1.35 1.35 1.40 1.34 1.34 1.42 1.26
    C/FM 0.47 0.56 0.47 0.43 0.32 0.36 0.79
    A/FM 9.81 10.96 9.84 12.27 10.75 9.33 14.47
    Rb 622.00 414.00 448.00 305.00 430.00 580.00 500.00
    Sr 37.60 33.40 37.90 23.40 55.20 55.40 31.30
    Y 8.50 8.58 8.37 4.30 9.63 11.40 4.73
    Zr 90.00 90.00 90.00 35.60 59.90 72.80 29.30
    Hf 2.01 2.12 2.21 1.07 1.69 2.08 1.11
    Nb 16.70 17.10 16.70 8.30 12.10 20.90 12.90
    Ta 7.41 7.39 7.51 3.07 2.09 6.07 6.03
    Ba 96.70 84.50 102.00 42.80 99.70 83.00 76.70
    Th 7.62 7.49 8.11 2.71 4.79 5.96 3.94
    U 30.80 35.90 27.20 9.20 13.90 18.00 8.44
    Pb 23.20 23.00 23.90 12.30 24.50 22.70 24.40
    Ti 930.00 940.00 940.00 779.00 959.00 1019.00 420.00
    P 999.00 1077.00 1038.00 1090.00 1134.00 1221.00 1134.00
    Rb/Sr 16.50 12.40 11.80 13.00 7.79 10.50 16.00
    Rb/Ba 6.43 4.90 4.39 7.13 4.31 6.99 6.52
    Rb/Nb 37.20 24.20 26.80 36.70 35.50 27.80 38.80
    Zr/Hf 44.80 42.50 40.70 33.30 35.40 35.00 26.40
    Th/U 0.25 0.21 0.30 0.29 0.34 0.33 0.47
    La 8.68 9.42 10.10 3.79 7.41 9.56 5.54
    Ce 18.30 19.92 21.24 9.79 17.20 22.50 10.14
    Pr 2.16 2.28 2.50 0.91 1.60 1.94 1.19
    Nd 7.78 8.34 8.94 3.42 6.03 7.31 4.14
    Sm 1.79 2.01 2.09 0.88 1.62 1.88 0.99
    Eu 0.23 0.21 0.23 0.10 0.21 0.22 0.15
    Gd 1.63 1.70 1.83 0.82 1.50 1.77 0.89
    Tb 0.28 0.28 0.29 0.15 0.30 0.34 0.15
    Dy 1.59 1.62 1.56 0.84 1.65 1.83 0.80
    Ho 0.26 0.26 0.26 0.13 0.25 0.28 0.12
    Er 0.67 0.68 0.69 0.36 0.64 0.74 0.35
    Tm 0.09 0.09 0.09 0.05 0.09 0.11 0.05
    Yb 0.61 0.61 0.81 0.32 0.54 0.70 0.33
    Lu 0.08 0.08 0.08 0.05 0.08 0.10 0.05
    ∑REE 44.16 47.49 50.69 21.61 39.12 49.28 24.85
    LREE/HREE 7.47 7.92 8.01 6.94 6.75 7.40 8.07
    δEu 0.41 0.34 0.35 0.35 0.40 0.36 0.48
    (La/Yb)N 10.21 11.13 8.90 8.50 9.84 9.80 12.04
    (La/Sm)N 3.13 3.03 3.12 2.78 2.95 3.28 3.61
    (Gd/Yb)N 2.21 2.32 1.86 2.12 2.30 2.09 2.23
    Zr+Nb+Ce+Y 739.00 523.00 558.00 419.00 532.00 676.00 706.00
    下载: 导出CSV

    表  4  洞上产铀花岗岩、长江岩体、打鼓寨岩体岩石地球化学组分对比表

    Table  4.   Comparison table of petrogeochemical components of Dongshang U-bearing granite, Changjiang granite and Daguzhai granite

    岩体SiO2/%K2O+Na2O/%K2O/Na2OCaO/Na2OA/CNK∑REE/(×10−6LREE/HREEδEu
    长江 74.00 8.22 1.81 0.31 1.11 197.0 7.38 0.21
    洞上 73.90 7.95 1.20 0.17 1.22 39.6 7.51 0.39
    打鼓寨 73.20 8.39 1.69 0.22 1.22 205.0 4.43 0.33
    岩体 (Zr+Nb+Ce+Y)/(×10−6 Zr/Hf Rb/Sr U/(×10−6 Th/U 锆石U/(×10−6 锆石Th/(×10−6 锆石Th/U
    长江 252.00 24.60 10.50 18.00 2.22 2453 1084 0.75
    洞上 107.00 36.90 12.60 20.50 0.31 2592 660 0.49
    打鼓寨 249.00 33.20 6.75 19.50 2.45 68348 33230 0.48
    注:打鼓寨岩体数据引自徐勋胜等(2021),长江岩体数据引自田泽瑾(2014
    下载: 导出CSV
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出版历程
  • 收稿日期:  2023-03-07
  • 修回日期:  2023-09-26
  • 预出版日期:  2024-01-02

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