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    粤西北印支期太保岩体的锆石U-Pb年代学、地球化学及岩石成因

    李响 王令占 涂兵 田洋 谢国刚 张楗钰 张宗言

    李响, 王令占, 涂兵, 田洋, 谢国刚, 张楗钰, 张宗言, 2021. 粤西北印支期太保岩体的锆石U-Pb年代学、地球化学及岩石成因. 地球科学, 46(4): 1199-1216. doi: 10.3799/dqkx.2020.193
    引用本文: 李响, 王令占, 涂兵, 田洋, 谢国刚, 张楗钰, 张宗言, 2021. 粤西北印支期太保岩体的锆石U-Pb年代学、地球化学及岩石成因. 地球科学, 46(4): 1199-1216. doi: 10.3799/dqkx.2020.193
    Li Xiang, Wang Lingzhan, Tu Bing, Tian Yang, Xie Guogang, Zhang Jianyu, Zhang Zongyan, 2021. Zircon Geochronology, Geochemistry and Petrogenesis of the Taibao Pluton in Northwest Guangdong Province. Earth Science, 46(4): 1199-1216. doi: 10.3799/dqkx.2020.193
    Citation: Li Xiang, Wang Lingzhan, Tu Bing, Tian Yang, Xie Guogang, Zhang Jianyu, Zhang Zongyan, 2021. Zircon Geochronology, Geochemistry and Petrogenesis of the Taibao Pluton in Northwest Guangdong Province. Earth Science, 46(4): 1199-1216. doi: 10.3799/dqkx.2020.193

    粤西北印支期太保岩体的锆石U-Pb年代学、地球化学及岩石成因

    doi: 10.3799/dqkx.2020.193
    基金项目: 

    中国地质调查局项目 12120113063200

    中国地质调查局项目 DD20201121

    详细信息
      作者简介:

      李响(1983-), 男, 副研究员, 从事成因矿物学、岩石地球化学研究.ORCID: 0000-0001-5874-2056.E-mail: lixiang_503@163.com

    • 中图分类号: P597

    Zircon Geochronology, Geochemistry and Petrogenesis of the Taibao Pluton in Northwest Guangdong Province

    • 摘要: 华南早中生代构造-岩浆演化还存在不同的争议.以广东西北部连山地区晚三叠世含暗色微粒包体(MMEs)的太保岩体为研究对象,进行了岩石学、锆石U-Pb年代学、地球化学和Sr-Nd-Hf同位素组成研究.4个花岗岩样品的锆石206Pb/238U加权平均年龄分别为219.8±1.8 Ma、220.5±1.0 Ma、221.5±1.7 Ma和220.2±1.1 Ma,为印支晚期岩浆作用的产物.地球化学分析显示,寄主花岗岩为高钾钙碱性花岗岩,低硅、高碱,铝饱和指数A/CNK值为0.79~1.16.包体SiO2含量为55.13%~62.56%,铁、镁含量明显高于寄主花岗岩,MgO和FeOT含量分别为2.31%~4.60%和5.53%~6.63%.包体与寄主花岗岩均富集轻稀土,并表现出显著的Ba、Sr、Ti负异常.寄主花岗岩和包体均具有较高的εNd(t)值(-3.42~-2.60和-0.90~-0.52)和较小的二阶段Nd模式年龄(TDM2分别为1.30~1.35 Ga、1.10~1.13 Ga).寄主花岗岩具有较宽泛的εHf(t)值(-2.6~+4.3,平均值为+0.7)和两阶段Hf模式年龄(0.95~1.39 Ga)变化范围,指示太保岩体形成于中元古代下地壳变基性岩物质的熔融,并与亏损地幔物质发生岩浆混合作用.基于以上数据,笔者认为太保岩体是印支晚期伸展条件下亏损地幔和下地壳物质混合的产物.结合近年来报道的邻近区域的基性岩浆活动,认为华南古特提斯构造域向古太平洋构造域的转换可能开始于晚三叠世(233 Ma).

       

    • 图  1  华南早中生代花岗岩分布及太保岩体大地构造位置示意图

      图b中,①太保岩体花岗岩(220~222 Ma),②道县虎子岩基性包体(220~233 Ma),③宁远保安圩碱性玄武岩(206~212 Ma),④宜章长城岭辉绿岩(227 Ma),⑤富川鲁洞辉绿玢岩(208 Ma);a.华南早中生代花岗岩分布(修改自Xu et al., 2019);b.华南中生代花岗岩-火山岩Nd同位素模式年龄等值线图(修改自Zhou et al., 2006),字母ABCD分别代表 4条低Nd模式年龄带

      Fig.  1.  Sketch map showing the distribution of the Early Mesozoic granites and tectonic location of Taibao pluton in South China

      图  2  太保岩体地质简图

      Fig.  2.  Geological sketch of Taibao pluton

      图  3  太保岩体野外和显微镜下典型照片

      a.中细粒斑状二长花岗岩野外露头,似斑状结构,斑晶为钾长石;b.中粒斑状花岗闪长岩,偶见环斑;c,d.暗色微粒包体,寄主岩为花岗闪长岩,包体中见捕获的寄主岩的钾长石斑晶,钾长石斑晶定向排列方向与包体长轴方向一致;e.二长花岗岩镜下照片,斜长石绢云母化,黑云母绿泥石化(正交偏光);f.花岗闪长岩镜下照片,角闪石见垂直C轴的菱形切面(正交偏光).矿物缩写:Qz.石英;Kfs.钾长石;Pl.斜长石;Bt.黑云母;Amp.角闪石

      Fig.  3.  Representative field photos and micrographs of Taibao pluton

      图  4  太保岩体代表性锆石CL图像和分析点位

      小的实线圈为原位U-Pb定年分析点,大的虚线圈为原位Hf同位素分析点,括号内数值为εHf(t)值

      Fig.  4.  CL images and analytical locations of representative zircons from the Taibao pluton

      图  5  太保岩体花岗岩锆石U-Pb年龄谐和图

      Fig.  5.  Zircon U-Pb concordia age plots of granitic samples from Taibao pluton

      图  6  太保岩体花岗岩A/CNK-A/NK图解(a)和SiO2-K2O图解(b)

      Fig.  6.  A/CNK-A/NK (a) and SiO2-K2O (b) diagrams for granitic samples of Taibao pluton

      图  7  太保岩体主量元素哈克图解和同分母氧化物比值协变图

      文献数据鲁学悟等(2008)

      Fig.  7.  Harker variation diagrams and K2O/CaO vs. SiO2/CaO, Al2O3/CaO vs. Na2O/CaO plots for samples from Taibao pluton

      图  8  太保岩体花岗岩的球粒陨石标准化稀土配分模式(a)和微量元素原始地幔标准化蛛网图(b)

      球粒陨石和原始地幔标准化值据Sun and McDonough(1989)

      Fig.  8.  Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element spider diagrams (b) for the samples from Taibao pluton

      图  9  太保岩体中与岩浆混合作用相关的微量元素相关图及同分母比值图

      文献数据鲁学悟等(2008)

      Fig.  9.  Correlation diagram and ration diagram in the same denominator of trace elements for rocks related to magma mixing in Taibao pluton

      图  10  太保岩体花岗岩εNd(t)-t(a)和εHf(t)-t(b)关系图解

      Fig.  10.  εNd(t)-t (a) and εHf(t)-t (b) plots for samples from Taibao pluton

      图  11  太保岩体花岗岩Al2O3/TiO2-CaO/Na2O图解(a)(Sylvester, 1998)和C/FM-A/FM源区判别图解(b)(Altherr et al., 2000)

      图例同图 7

      Fig.  11.  Al2O3/TiO2-CaO/Na2O diagram (a, after Sylvester, 1998) and C/FM-A/FM diagram (b, after Altherr et al., 2000) for samples from Taibao pluton

      图  12  εNd(t)-87Sr/86Sri图解

      底图据Zhao et al.(2013),华夏印支期壳源S型花岗岩引自Hsieh et al. (2008),虎子岩印支期捕掳体数据引自Dai et al.(2008);桃江辉绿岩数据金鑫镖等(2017).亏损地幔和地壳端员成分据Xia and Xu(2020)

      Fig.  12.  εNd(t)-87Sr/86Sri diagram

      图  13  太保岩体构造环境判别图解(Pearce et al., 1996)

      VAG.火山弧花岗岩;WPG.板内花岗岩;syn-COLG.同碰撞花岗岩;post-COLG.后碰撞花岗岩;ORG.洋中脊花岗岩

      Fig.  13.  Discrimination diagram of tectonic environments for the samples from Taibao pluton(Pearce et al., 1996)

      表  1  太保岩体花岗岩样品的主量元素(%)和微量元素(10-6)分析结果

      Table  1.   Major element(%) and trace element(10-6) compositions of granitic samples from Taibao pluton

      岩性 主体 包体
      样号 13-24 # 13-25 # TB-1H TB-2H TB-3H TB-4H TB-5H TB-B1 TB-B5 TB-B6
      SiO2 63.10 64.28 65.88 65.11 65.00 64.20 66.42 56.01 55.13 62.56
      TiO2 0.58 0.66 0.59 0.66 0.62 0.63 0.46 1.11 1.14 0.86
      Al2O3 13.66 15.59 15.50 15.19 15.32 16.18 16.15 16.02 16.93 16.11
      Fe2O3 0.61 1.40 1.46 1.38 1.64 1.96 0.69 1.79 2.02 2.45
      FeO 3.99 3.41 2.51 3.14 2.74 2.47 1.96 5.02 4.82 3.32
      MnO 0.09 0.10 0.09 0.10 0.09 0.09 0.06 0.21 0.12 0.11
      MgO 1.53 1.94 1.68 2.01 1.96 1.76 1.17 4.60 3.03 2.31
      CaO 3.99 3.48 2.51 3.54 3.49 2.33 2.41 5.77 4.43 4.41
      Na2O 3.61 3.53 3.49 3.39 3.51 3.30 3.82 4.13 5.30 4.98
      K2O 3.81 3.80 4.01 3.96 3.79 3.90 5.76 3.53 1.69 1.44
      P2O5 0.22 0.27 0.27 0.27 0.26 0.25 0.18 0.52 0.50 0.29
      LOI 4.35 1.13 1.71 0.89 1.24 2.60 0.70 0.72 4.28 0.77
      总量 99.53 99.60 99.69 99.63 99.66 99.67 99.78 99.43 99.39 99.61
      K2O/Na2O 1.06 1.08 1.15 1.17 1.08 1.18 1.51 0.85 0.32 0.29
      AKI 0.74 0.64 0.65 0.65 0.65 0.60 0.78 0.66 0.62 0.61
      A/CNK 0.79 0.96 1.06 0.93 0.94 1.16 0.95 0.76 0.91 0.91
      A/NK 1.36 1.57 1.54 1.54 1.55 1.68 1.29 1.51 1.61 1.65
      Li 19.2 29.7 36.7 36.4 45.1 43.5 32.4 60.6 102.0 48.6
      Be 2.90 2.91 3.31 3.32 3.75 3.78 3.35 4.77 5.80 4.85
      Sc 6.4 9.3 9.5 11.3 12.8 8.8 5.4 20.7 21.8 13.3
      V 58.2 94.9 79.9 105.0 107.0 89.9 52.3 162.0 150.0 124.0
      Cr 19.3 20.7 17.2 23.5 26.1 21.1 15.0 133.0 87.7 13.3
      Co 10.5 13.9 12.1 14.3 15.7 13.7 7.2 27.4 23.8 16.6
      Ni 11.9 13.1 12.1 16.0 17.1 13.5 9.1 56.6 38.8 10.6
      Cu 13.8 21.9 14.7 5.7 10.5 14.1 1.3 10.9 7.1 9.3
      Zn 49.8 58.1 50.6 61.2 56.1 56.9 35.8 94.2 89.2 68.3
      Ga 13.9 17.4 16.9 17.7 18.6 18.3 16.6 20.7 25.7 19.5
      Rb 223 168 181 165 180 180 212 217 123 133
      Sr 208 340 333 313 353 305 395 273 366 325
      Y 19.4 17.7 16.2 18.4 19.0 15.9 14.0 26.6 29.0 22.9
      Nb 24.8 16.2 17.4 20.0 19.1 18.5 18.5 27.0 40.2 26.3
      Cs 16.7 5.6 7.0 6.7 8.7 8.3 5.8 11.7 11.2 9.3
      Ba 568 745 597 568 707 730 1370 405 126 132
      La 41.6 42.4 36.7 37.6 49.7 37.5 28.7 52.8 62.3 38.6
      Ce 72.5 66.9 58.2 61.7 74.3 66.0 55.2 102.0 126.0 70.8
      Pr 7.10 6.89 6.33 6.89 7.61 7.00 6.26 11.00 13.70 8.64
      Nd 26.5 24.6 23.7 27.8 28.5 24.8 23.6 46.0 59.9 35.9
      Sm 5.06 4.66 3.87 4.49 4.70 4.39 3.84 7.61 8.80 5.71
      Eu 0.99 1.18 1.03 1.08 1.17 1.06 0.86 2.11 2.15 1.47
      Gd 4.03 4.20 3.37 3.66 4.27 4.04 3.19 6.93 7.49 4.59
      Tb 0.67 0.63 0.54 0.63 0.66 0.60 0.49 1.06 1.14 0.79
      Dy 3.41 3.34 3.01 3.56 3.54 3.09 2.49 5.24 5.75 4.61
      Ho 0.66 0.63 0.54 0.60 0.66 0.57 0.45 0.95 0.98 0.80
      Er 2.22 1.83 1.47 1.68 1.88 1.66 1.27 2.72 2.82 2.14
      Tm 0.36 0.29 0.25 0.29 0.30 0.26 0.20 0.41 0.45 0.37
      Yb 2.21 1.91 1.68 2.01 2.01 1.65 1.34 2.66 3.05 2.70
      Lu 0.35 0.28 0.24 0.26 0.30 0.26 0.19 0.39 0.42 0.36
      Ta 2.36 1.09 1.28 1.65 1.37 1.34 1.35 1.59 2.89 2.10
      Tl 0.83 0.64 0.72 0.70 0.67 0.73 0.72 0.74 0.47 0.51
      Pb 20.4 20.5 22.3 20.7 20.3 21.5 27.4 20.3 39.7 15.5
      Th 25.9 19.4 20.4 19.0 22.8 19.4 15.4 13.2 20.5 17.1
      U 9.19 5.07 4.72 7.43 4.71 4.33 6.53 4.05 9.33 8.10
      Zr 72.7 67.9 42.1 54.4 43.7 61.2 55.0 98.9 98.1 94.9
      Hf 2.35 2.14 1.43 1.67 1.48 2.14 1.61 3.03 3.21 2.65
      ΣREE 167.7 159.7 140.9 152.3 179.6 152.9 128.1 241.9 295.0 177.5
      LREE 153.8 146.6 129.8 139.6 166.0 140.8 118.5 221.5 272.9 161.1
      HREE 13.9 13.1 11.1 12.7 13.6 12.1 9.6 20.4 22.1 16.4
      LREE/HREE 11.1 11.2 11.7 11.0 12.2 11.6 12.3 10.9 12.3 9.9
      (La/Yb)N 13.5 15.9 15.7 13.4 17.7 16.3 15.4 14.2 14.7 10.3
      δEu 0.65 0.80 0.85 0.79 0.78 0.76 0.73 0.87 0.79 0.85
      δCe 0.95 0.87 0.86 0.87 0.84 0.93 0.96 0.98 1.01 0.91
      下载: 导出CSV

      表  2  太保岩体Sr-Nd同位素组成

      Table  2.   Sr and Nd isotopic compositions of samples from Taibao pluton

      样品号 花岗岩 包体
      13-24# 13-25# TB-1H TB-3H TB-5H TB-B1 TB-B6
      Rb(10-6) 223 168 181 180 212 217 133
      Sr(10-6) 208 340 333 353 395 273 325
      87Rb/86Sr 3.10 1.43 1.57 1.48 1.55 2.30 1.18
      87Sr/86Sr 0.715 85 0.711 55 0.712 56 0.711 85 0.711 15 0.712 58 0.710 26
      ISr 0.706 14 0.707 08 0.707 64 0.707 23 0.706 29 0.705 38 0.706 55
      Sm(10-6) 5.06 4.66 3.87 4.70 3.84 7.61 5.71
      Nd(10-6) 26.5 24.6 23.7 28.5 23.6 46.0 35.9
      147Sm/144Nd 0.116 2 0.115 3 0.099 4 0.100 4 0.099 0 0.100 7 0.096 8
      143Nd/144Nd 0.512 347 0.512 360 0.512 356 0.512 349 0.512 364 0.512 473 0.512 448
      εNd(t) -3.4 -3.1 -2.7 -2.9 -2.6 -0.5 -0.9
      TDM2(Ga) 1.38 1.35 1.29 1.31 1.28 1.10 1.13
      下载: 导出CSV
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