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桂东南马其岗石英二长斑岩年代学、地球化学特征及成因

王晓地, 张利国, 贾小辉

王晓地, 张利国, 贾小辉. 2017: 桂东南马其岗石英二长斑岩年代学、地球化学特征及成因. 地质通报, 36(5): 761-771.
引用本文: 王晓地, 张利国, 贾小辉. 2017: 桂东南马其岗石英二长斑岩年代学、地球化学特征及成因. 地质通报, 36(5): 761-771.
WANG Xiaodi, ZHANG Liguo, JIA Xiaohui. 2017: A study of geochronology, geochemistry and genesis of Maqigang beschtauite pluton, south-eastern Guangxi. Geological Bulletin of China, 36(5): 761-771.
Citation: WANG Xiaodi, ZHANG Liguo, JIA Xiaohui. 2017: A study of geochronology, geochemistry and genesis of Maqigang beschtauite pluton, south-eastern Guangxi. Geological Bulletin of China, 36(5): 761-771.

桂东南马其岗石英二长斑岩年代学、地球化学特征及成因

基金项目: 

中国地质调查局项目《中南地区基础地质综合研究》 1212710610714

《南岭关键地区区域地质调查》 12120113063600

《国家地质数据库建设与整合》 1212011220512

详细信息
    作者简介:

    王晓地(1974-), 男, 硕士, 高级工程师, 从事中南地区岩浆岩有关的矿物学、岩石学调查和研究。E-mail:178372234@qq.com

  • 中图分类号: P588.13;P595;P597

A study of geochronology, geochemistry and genesis of Maqigang beschtauite pluton, south-eastern Guangxi

  • 摘要:

    马其岗石英二长斑岩体出露于桂东南博白-梧州断裂带南东侧,对其开展了锆石U-Pb年代学、地球化学、Sr-Nd-Hf同位素及成因研究。结果表明,岩体LA-ICP-MS锆石U-Pb年龄为90.2±1.5Ma(MSWD=1.7)。岩体富碱(ALK=7.38%~8.14%)、富钾(K2O=4.41%~4.78%),稀土元素特征为轻稀土元素富集型,微量元素特征为富集大离子亲石元素(Rb、Th、U、K、Pb、LREE),亏损高场强元素(Nb、Ta、P、Ti、HREE),符合钾玄岩系列的岩石特点。岩体有较高的Mg#值(42.82~50.35),较低的Sr含量(268.00×10-6~304.00×10-6),以及较高的锆石饱和温度(860~883℃),同时Nb/Ta(平均值为11.24)、Zr/Hf(平均值为38.20),Th/La值(平均值为0.17)明显不同于大陆地壳特征,表明岩浆主要来自下部地壳或地幔,在上升侵位过程中受到地壳大规模混染程度较小,具有EMⅡ富集地幔端元的Sr-Nd同位素特征。二阶段Nd模式年龄(tDM2)变化于1.33~1.36Ga之间,二阶段Hf模式年龄(tDM2)主体为1.20~1.50Ga,两者模式年龄较一致,显示马其岗岩体可能是中元古代中期镁铁质岩石部分熔融的产物。石英二长斑岩形成于板内伸展环境,整个华南在90Ma左右存在一次大规模的伸展事件,其动力学机制与古太平洋板块低角度俯冲有关。

    Abstract:

    Maqigang beschtauite pluton is located in the southeast of the Bobai-Wuzhou fault, southeastern Guangxi.The zircon UPb geochronology, elemental geochemistry and Sr-Nd-Hf isotopic components as well as petrogenesis of Maqigang beschtauite were investigated in this paper.The LA-ICPMS zircon U-Pb age is 90.2±1.5Ma (MSWD=1.7).The beschtauite is characterized by rich alkalis (ALK=7.38%~8.14%) and K (K2O=4.41%~4.78%).The rare earth elements exhibit the light REE enrichment type, with trace elements characterized by enrichment of LILE (e.g., Rb, Th, U, K, Pb, LREE) and depletion of HFSE elements (e.g., Nb, Ta, P, Ti, HREE).The geochemical characteristics of Maqigang beschtauite show shoshonitic features.The beschtauite has relatively high Mg# values (42.82~50.35) and zircon saturation temperatures (860~883℃) and low Sr values (268.00×10-6~304.00×10-6).The Nb/Ta ratios (11.24 on average), Zr/Hf ratios (38.20 on average) and Th/La ratios (0.17 on average) of the beschtauite are remarkably different from those of upper crustal rocks, indicating that the beschtauite originated from lower crustal or mantle source.In addition, the beschtauitic magma was less contaminated by the upper crust substance in the process of emplacement.The Sr-Nd isotopic com-positions show that they have the characteristics of the EMⅡ source.Nd isotopic two-phase model age (tDM2=1.33~1.36Ga) is similar to the Hf isotopic two-phase model principal age (tDM2=1.20~1.50Ga), inmplying that the beschtauite was derived dominantly from mafic rocks in the middle Proterozoic.The Maqigang beschtauite was formed in an intra-plate extensional environment.There was a huge stretching event throughout South China at 90Ma±.The dynamic mechanism of the event was connected with low angle sub-duction of the ancient Pacific plate.

  • 致谢: 成稿过程中得到中国地质调查局武汉地质调查中心徐德明研究员的帮助指导,在此予以感谢。
  • 图  1   马其岗岩体地质图(据参考文献修改)

    Q—第四系;K2l1—罗文组第一段;K2x1—西垌组第一段;K2x—西垌组(未分段);TJ1t—天堂组;D2d—东岗岭组;S2l2—连滩组第二段;S2l1—连滩组第一段;Pt3s—射广组;1—石英二长斑岩;2—二长花岗岩;3—片麻状二长花岗岩;4—地质界线;5—角度不整合界线;6—断层;7—韧性断层;8—角岩化;9—采样点

    Figure  1.   Geological map of Maqigang beschtauite pluton

    图  2   马其岗石英二长斑岩锆石阴极发光图像(a)、锆石U-Pb谐和图(b)及年龄加权平均值图(c)

    Figure  2.   CL images (a), U-Pb concordia diagram(b)and weighted average value diagram of zircons(c)from Maqigang beschtauite

    图  3   马其岗石英二长斑岩分类判别图[6-9]

    a-SiO2-(K2O+Na2O);b-SiO2-K2O;c-A/CNK-A/NK;d-AFM图解

    Figure  3.   Classfication of Maqigang beschtauite

    图  4   马其岗石英二长斑岩稀土元素配分曲线(a)及微量元素蛛网图(b)(球粒陨石标准化数值据参考文献[10])

    Figure  4.   Chondrite-normalized REE patterns(a)and primitive mantle-normalized trace elements patterns(b)of Maqigang beschtauite

    图  5   马其岗石英二长斑岩εNd(t)-t(a)、ISr-εNd(t)(b)、εHf(t)频数(c)和tDM2频数图(d)(a、b据参考文献[11-12])

    DM—亏损地幔;EMⅠ—Ⅰ型富集地幔;EMⅡ—Ⅱ型富集地幔;HIMU—高U/Pb值地幔;BSE—硅酸盐地球

    Figure  5.   εNd(t)-t(a)、ISr-εNd(t)(b)、εHf(t)frequency(c), and tDM2 frequncy(d)diagrams of Maqigang beschtauite

    图  6   马其岗石英二长斑岩构造环境判别图解[25-26]

    Figure  6.   Tectonic setting discrimination diagrams of Maqigang beschtauite

    表  1   马其岗石英二长斑岩LA-ICP-MS锆石U-Th-Pb同位素分析数据

    Table  1   LA-ICP-MS zircon U-Th-Pb data of Maqigang beschtauite

    点号含量/10-6同位素比值(经普通铅校正)年龄(经普通铅校正)/Ma
    PbThU207Pb/206Pb±1σ207Pb/235U±1σ206Pb/238U±1σ207Pb/206Pb±1σ207Pb/235U±1σ206Pb/238U±1σ
    111.093796540.04950.00280.09440.00520.01380.000217213191.64.988.31.3
    212.263337370.05010.00240.09810.00460.01420.000221111195.04.291.21.0
    338.28105923830.05050.00130.09650.00260.01380.00012176193.62.488.30.7
    4198.73913760.14470.00207.1880.1230.35790.0041228423213515197219
    540.82107625040.05000.00140.10060.00300.01450.00011956797.32.792.90.8
    614.835438690.04820.00240.09360.00450.01420.000210912490.94.290.61.1
    711.985805790.05580.00300.11810.00650.01530.0002456122113698.11.1
    818.942779430.05150.00160.12690.00410.01790.00032617212141152
    954.11846040.05580.00120.61490.01340.07940.00074565148784924
    1018.5858711230.04620.00150.08990.00290.01410.00019.3674.187.42.790.00.7
    1141.4120425520.04810.00140.09210.00250.01380.00011066989.42.488.60.6
    1250.8135731020.05230.00120.10150.00240.01400.00012985498.12.289.80.7
    1327.9457513880.04870.00140.11820.00340.01780.00031326711331142
    14267.5113534900.05300.00070.49460.00670.06740.00043283640854203
    1512.103285260.06440.00330.15930.00750.01820.000375410715071172
    1613.555457400.05050.00280.09950.00530.01450.000221712896.44.993.01.2
    1710.843486430.05360.00220.10140.00390.01400.00023549798.13.689.41.5
    1820.1068611240.04970.00180.09470.00320.01390.00011898191.93.088.90.7
    下载: 导出CSV

    表  2   马其岗石英二长斑岩主量、微量和稀土元素分析结果及参数

    Table  2   Compositions and parameters of major, trace and rare earth elements in Maqigang beschtauite

    样品mqg-1mqg-2mqg-3D3015-1样品mqg-1mqg-2mqg-3D3015-1D3013-1样品mqg-1mqg-2mqg-3D3015-1D3013-1
    SiO264.7664.0464.2664.00La70.3068.7069.2071.3167.58Ba1173.001049.001031.00935.00945.00
    TiO20.941.071.081.06Ce128.00127.00128.00138.60135.40Rb176.00170.00155.00160.00164.00
    Al2O314.6614.6914.6814.68Pr14.2014.3014.3015.9315.55Sr268.00280.00304.00283.00268.00
    Fe2O32.763.713.043.31Nd54.3055.0054.6059.0256.10Y47.5056.2047.8039.2239.35
    FeO3.382.802.992.25Sm10.309.989.9610.8710.77Zr265.00207.00386.00429.00457.00
    MnO0.090.100.090.07Eu2.452.302.322.452.52Nb37.8037.2037.8031.4032.00
    MgO1.421.491.451.28Gd9.199.279.209.629.73Th18.3018.2017.1020.2019.90
    CaO2.502.883.333.33Tb1.511.601.541.451.43Pb27.1025.2024.3024.5026.50
    Na2O3.363.273.082.95Dy8.809.488.948.198.17Ga23.8023.1022.5017.5017.60
    K2O4.784.524.414.43Ho1.601.751.561.571.60Zn101.00139.00102.0087.0097.00
    P2O50.280.280.330.35Er4.685.564.924.264.25Cu17.3015.7015.7014.9015.90
    H2O+0.420.810.811.58Tm0.770.840.700.680.66Ni10.1010.308.7312.0014.90
    CO20.170.150.150.09Yb4.535.184.534.244.19V55.8052.9060.0087.6082.90
    灼失0.780.840.90Lu0.680.820.670.620.63Cr14.5013.1013.507.1013.30
    总量100.30100.65100.6099.38∑REE311.31311.78310.44328.81318.58Hf7.406.079.6110.7011.20
    ALK8.147.797.497.38LREE279.55277.28278.38298.18287.92Cs9.378.4710.6011.2010.70
    K2O/Na2O1.421.381.431.50HREE31.7634.5032.0630.6330.66Sc8.208.299.402.402.10
    ACNK0.940.940.930.94∑L/∑H8.808.048.689.739.39Ta2.152.162.1515.9017.20
    σ3.052.882.642.59(La/Yb)n11.139.5110.9612.0611.57Co11.5012.1011.8030.9017.20
    Mg#42.8248.6846.3650.35δEu0.250.240.240.240.25U3.633.443.2974.3060.60
    注:石英二长斑岩样品D3015-1、D3013-1据参考文献;主量元素含量单位为%,微量和稀土元素为10-6
    下载: 导出CSV

    表  3   马其岗石英二长斑岩Sr-Nd同位素组成分析结果

    Table  3   Sr-Nd isotope data of Maqigang beschtauite

    样号Sm/10-6Nd/10-6147Sm/144Nd143Nd/144NdεNd(t)t/MaRb/10-6Sr/10-687Rb/86Sr87Sr/86Sr(87Sr/86Sr)itDM2/Ga
    mqg-19.35951.170.11130.5123200.000002-5.2290.2168.8253.11.8800.711580.000010.709161.33
    mqg-29.41951.360.11160.5123120.000003-5.3890.2165.0274.61.6940.711330.000030.709151.34
    mqg-39.94153.800.11240.5123020.000004-5.5990.2154.8301.91.4460.710970.000030.709111.36
    下载: 导出CSV

    表  4   马其岗石英二长斑岩锆石原位Hf同位素组成

    Table  4   LA-MC-ICP-MS zircon Hf isotope data of Maqigang beschtauite

    点号176Yb/177Hf176Lu/177Hf176Hf/177Hft/MaεHf(t)tDM1/GatDM2/Ga
    10.0313350.0008830.2826410.00001488-2.70.50.861.33
    20.0245230.0006920.2825930.00001391-4.40.50.931.44
    30.0380070.0010820.2826940.00001088-0.90.30.791.21
    40.0288410.0007950.2815230.0000141911-2.50.52.402.70
    50.0372950.0010700.2826380.00001992.9-2.80.70.871.33
    60.0277010.0007820.2826090.00001491-3.80.50.901.40
    70.0440300.0012160.2826780.00001997-1.30.70.821.24
    80.0254660.0007420.2825730.000012115-4.60.40.951.47
    90.0573360.0016130.2824950.0000154920.50.51.091.43
    100.0266400.0007620.2826060.00001290-3.90.40.911.41
    110.0316840.0009620.2826260.00001288.6-3.30.40.891.36
    120.0456900.0012750.2826810.00001189.8-1.30.40.811.24
    130.0226080.0006720.2826190.000012114-3.00.40.891.36
    140.0365680.0010990.2822740.000010420-8.70.41.381.96
    150.0259530.0007550.2827070.0000121170.20.40.771.16
    160.0365490.0010340.2826660.00001693-1.80.60.831.27
    170.0227850.0006580.2826560.00001189-2.20.40.841.30
    180.0283150.0008300.2826630.00001288.9-1.90.40.831.28
    下载: 导出CSV
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出版历程
  • 收稿日期:  2016-09-17
  • 修回日期:  2017-03-15
  • 网络出版日期:  2023-08-15
  • 刊出日期:  2017-04-30

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