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    西藏江玛地区闪长玢岩锆石U-Pb年龄、地球化学特征及其地质意义

    尹滔 张伟 尹显科 裴亚伦

    尹滔, 张伟, 尹显科, 裴亚伦, 2020. 西藏江玛地区闪长玢岩锆石U-Pb年龄、地球化学特征及其地质意义. 地球科学, 45(11): 4128-4142. doi: 10.3799/dqkx.2020.136
    引用本文: 尹滔, 张伟, 尹显科, 裴亚伦, 2020. 西藏江玛地区闪长玢岩锆石U-Pb年龄、地球化学特征及其地质意义. 地球科学, 45(11): 4128-4142. doi: 10.3799/dqkx.2020.136
    Yin Tao, Zhang Wei, Yin Xianke, Pei Yalun, 2020. Zircon U-Pb Ages, Geochemistry and Geological Significance of Diorite Porphyrite in Jiangma Area, Tibet. Earth Science, 45(11): 4128-4142. doi: 10.3799/dqkx.2020.136
    Citation: Yin Tao, Zhang Wei, Yin Xianke, Pei Yalun, 2020. Zircon U-Pb Ages, Geochemistry and Geological Significance of Diorite Porphyrite in Jiangma Area, Tibet. Earth Science, 45(11): 4128-4142. doi: 10.3799/dqkx.2020.136

    西藏江玛地区闪长玢岩锆石U-Pb年龄、地球化学特征及其地质意义

    doi: 10.3799/dqkx.2020.136
    基金项目: 

    中国地质调查局项目 DD20160026

    中国地质调查局项目 DD20191029

    详细信息
      作者简介:

      尹滔(1983-), 男, 工程师, 硕士, 主要从事区域地质与矿产地质调查相关的研究工作.ORCID:0000-0001-9002-5890.E-mail:406593621@qq.com

    • 中图分类号: P581

    Zircon U-Pb Ages, Geochemistry and Geological Significance of Diorite Porphyrite in Jiangma Area, Tibet

    • 摘要: 目前对班公湖-怒江蛇绿混杂岩带的中酸性侵入岩的报道相对较少,对其成因和形成机制的研究有助于揭示班公湖-怒江特提斯洋构造带的岩浆作用过程和动力学背景.对西藏班公湖-怒江蛇绿混杂岩带江玛地区的闪长玢岩进行了年龄分析、岩石地球化学研究.闪长玢岩的LA-ICP-MS锆石U-Pb年龄为121±1 Ma,表明其形成于早白垩世晚期.岩石地球化学特征表明,闪长玢岩具高Al2O3含量(18.2%~19.3%),属高铝玄武岩,岩石富集轻稀土元素和大离子亲石元素Rb、K等,亏损高场强元素Nb、Ta、Ti,属典型的岛弧玄武岩.综合区域地质资料认为,江玛地区闪长玢岩可能形成于俯冲带前缘增生的岛弧环境,是早白垩世期班公湖-怒江特提斯洋壳岩石圈南向俯冲消减背景下,板片脱水形成的流体与地幔楔橄榄岩发生交代作用的产物.

       

    • 图  1  江玛地区地质简图及采样位置

      a.青藏高原构造单元划分(据Zhu et al., 2013修改); JSSZ.金沙江缝合带;LSSZ.龙木错-双湖缝合带;BNMZ.班公湖-怒江蛇绿混杂岩带;SNMZ.狮泉河-纳木错蛇绿混杂岩带;LMF.洛巴堆-米拉山断裂带;IYZSZ.印度河-雅鲁藏布缝合带;b.研究区地质图

      Fig.  1.  Simplified geological map in the Jiangma region, Tibet, showing sample locations

      图  2  江玛地区地质构造特征及闪长玢岩镜下照片

      a.羌塘地块的曲色组逆冲于缝合带去申拉组;b.去申拉组粉砂岩夹板岩岩性段内侵入的层状闪长玢岩体;c.去申拉组粉砂岩夹板岩岩性段因岩层不同能干性差异而形成的层间揉皱构造;d.研究区褶皱南翼的正常交错层理构造,指示去申拉组为正常沉积层序;e.研究区褶皱北翼的倒转的粒序层理构造,指示去申拉组倒转;f.研究区褶皱北翼的倒转的交错层理构造,指示去申拉组倒转;g.去申拉组凝灰岩层侵入的层状闪长玢岩体,该处为样品采集点;h.闪长玢岩露头;i.闪长玢岩正交偏光照片

      Fig.  2.  Geological structural characteristics in Jiangma area and photomicrographs of diorite porphyrite

      图  3  闪长玢岩锆石阴极发光图和锆石U-Pb谐和图

      Fig.  3.  Zircon CL images and zircon U-Pb concordia diagram of the diorite porphyrite

      图  4  闪长玢岩TAS图解

      Le Maitre(1989)

      Fig.  4.  Total alkalis-silica diagram of the diorite porphyrite

      图  5  闪长玢岩球粒陨石标准化稀土元素配分曲线图(a)及原始地幔标准化微量元素蛛网图(b)

      a.标准化值据Boynton(1984);b.标准化值据Sun and McDonough(1989);OIB、N-type MORB数据引自Sun and McDonough(1989),BABB、IAB数据为平均值杨婧等(2016a, 2016b)

      Fig.  5.  Chondrite-normalized REE patterns(a)and primitive mantle-normalized trace element spider diagrams(b)for the diorite porphyrite

      图  6  闪长玢岩选择性地球化学图解

      Fig.  6.  Selective geochemical diagrams of the diorite porphyrite

      图  7  闪长玢岩构造判别图解

      a. V-Ti/1 000图解(Shervais, 1982);b. TiO2-Zr图解(Floyd and Winchester, 1975);c. La/Yb-La图解(李曙光, 1993);d. La/Nb-Y图解(Sandeman et al., 2006);e. Ti/100-Zr-Y×3图解(Pearce and Cann, 1973);f. 2Nb-Zr/4-Y图解(Meschede, 1986)

      Fig.  7.  Tectonic setting discrimination diagrams of the diorite porphyrite

      表  1  闪长玢岩LA-ICP-MS锆石U-Pb定年结果

      Table  1.   LA-ICP-MS zircon U-Pb dating results of the diorite porphyrite

      测点 含量(10-6) Th/U 同位素比值 表面年龄(Ma)
      Pb U Th 206Pb/
      238U
      207Pb/
      235U
      207Pb/206Pb 206Pb/
      238U
      207Pb/
      235U
      207Pb/
      206U
      样品D1301TW1
      02 58.9 2 201 2 855 1.30 0.018 7 0.000 2 0.131 3 0.003 5 0.050 8 0.001 3 120 1 125 3 232 64
      03 59.1 2 142 3 328 1.55 0.018 5 0.000 2 0.121 6 0.003 3 0.047 5 0.001 2 118 1 117 3 76 94
      04 102.3 3 597 5 603 1.56 0.019 0 0.000 2 0.124 7 0.003 1 0.047 6 0.001 2 121 1 119 3 80 92
      05 73.6 2 382 4 364 1.83 0.019 4 0.000 2 0.133 2 0.003 9 0.049 7 0.001 4 124 1 127 3 183 67
      06 33.5 1 265 1 455 1.15 0.018 9 0.000 2 0.128 2 0.004 6 0.049 1 0.001 7 120 1 122 4 154 79
      07 69.6 2 561 3 679 1.44 0.019 0 0.000 2 0.129 5 0.004 4 0.049 1 0.001 5 121 2 124 4 154 77
      08 50.4 1 933 2 570 1.33 0.018 8 0.000 2 0.132 5 0.004 2 0.050 8 0.001 5 120 1 126 4 235 70
      10 39.4 1 488 1 801 1.21 0.018 9 0.000 2 0.136 0 0.004 1 0.052 2 0.001 6 121 1 130 4 295 64
      11 122.7 4 065 7 692 1.89 0.019 1 0.000 2 0.133 8 0.003 6 0.050 7 0.001 3 122 1 127 3 233 61
      13 83.5 2 873 5 115 1.78 0.018 5 0.000 2 0.122 6 0.003 6 0.048 0 0.001 4 118 1 117 3 98 66
      14 55.8 1 852 3 349 1.81 0.019 3 0.000 2 0.139 3 0.004 4 0.052 1 0.001 6 123 1 132 4 300 70
      17 68.7 2 407 3 988 1.66 0.018 9 0.000 2 0.135 9 0.003 6 0.051 9 0.001 3 121 1 129 3 280 62
      18 66.2 2 211 3 985 1.80 0.019 3 0.000 2 0.127 2 0.003 6 0.047 7 0.001 3 123 1 122 3 87 67
      20 76.4 2 780 4 169 1.50 0.018 9 0.000 2 0.122 7 0.003 1 0.046 9 0.001 2 121 1 118 3 43 59
      21 213 7 102 12 924 1.82 0.019 1 0.000 1 0.126 1 0.002 5 0.047 6 0.000 9 122 1 121 2 76 48
      下载: 导出CSV

      表  2  闪长玢岩主量元素(%)和微量元素(10-6)分析结果

      Table  2.   Major elements (%) and trace elements (10-6) compositions of the diorite porphyrite

      样品编号 D1031ZH2 D1031ZH3 D1031ZH4 D1031ZH5 D1031ZH6 D1031ZH7 D1031ZH8
      样品名称 闪长玢岩 闪长玢岩 闪长玢岩 闪长玢岩 闪长玢岩 闪长玢岩 闪长玢岩
      SiO2 52.4 51.0 51.9 52.6 52.9 51.5 51.7
      TiO2 0.97 0.90 0.91 0.95 0.93 0.98 0.95
      Al2O3 18.6 18.5 19.3 18.2 19.2 18.8 18.6
      Fe2O3 2.88 3.21 3.03 2.85 3.37 3.68 3.48
      FeO 4.05 3.68 3.51 3.48 2.99 3.85 3.45
      MnO 0.14 0.12 0.11 0.12 0.12 0.13 0.12
      MgO 3.94 3.55 3.11 3.54 3.20 3.62 3.71
      CaO 4.14 6.08 5.63 4.63 5.10 5.62 5.11
      Na2O 4.55 4.18 4.09 5.46 4.39 4.40 4.15
      K2O 3.92 3.84 3.40 3.10 3.36 3.17 4.13
      P2O5 0.50 0.50 0.49 0.49 0.50 0.53 0.52
      H2O+ 2.05 1.81 2.18 1.98 1.79 2.21 2.62
      H2O- 0.29 0.45 0.22 0.42 0.47 0.18 0.26
      Total 98.4 97.8 97.9 97.8 98.4 98.7 98.8
      Na2O+K2O 8.47 8.02 7.49 8.55 7.76 7.57 8.27
      FeO*/MgO 1.69 1.85 2.00 1.71 1.88 1.97 1.77
      Mg# 51.6 49.3 47.3 51.3 48.9 47.7 50.4
      Be 1.71 1.49 1.73 1.93 1.83 1.43 1.62
      Li 36.4 32.5 35.5 39.6 33.0 34.9 32.9
      Cu 277 267 250 268 271 266 273
      V 175 174 183 161 177 176 180
      Cr 38.4 33.1 29.7 34.0 30.6 41.4 36.0
      Co 22.0 21.4 20.0 19.4 18.5 20.3 20.9
      Ni 35.4 33.7 25.8 26.7 27.6 33.0 31.1
      Rb 131 113 107 115 87.4 88.0 141
      Y 31.1 30.2 35.9 43.5 29.4 32.0 32.5
      Zr 166 153 160 235 180 155 158
      Nb 9.37 9.01 9.09 16.3 10.2 9.41 8.86
      Cs 2.55 2.21 2.43 2.16 1.86 1.25 1.95
      La 48.8 48.5 47.7 72.5 49.0 51.4 51.9
      Ce 75.4 74.8 75.3 80.6 73.6 80.3 79.4
      Pr 10.4 10.1 10.3 14.6 10.2 11.0 11.0
      Nd 40.5 38.9 39.8 43.5 39.1 41.7 43.4
      Sm 7.67 7.25 7.35 7.58 7.26 7.81 7.99
      Eu 2.88 2.31 2.52 1.97 2.23 2.23 2.43
      Gd 6.14 5.35 5.89 5.44 5.66 5.66 5.77
      Tb 1.37 1.21 1.27 1.25 1.23 1.27 1.35
      Dy 6.91 6.50 6.68 7.13 6.68 6.97 7.26
      Ho 1.33 1.23 1.23 1.36 1.23 1.35 1.38
      Er 4.23 3.83 3.95 3.98 3.87 4.07 4.23
      Tm 0.50 0.50 0.48 0.53 0.47 0.52 0.53
      Yb 3.98 3.69 3.76 3.78 3.51 3.67 3.90
      Lu 0.67 0.63 0.67 0.69 0.59 0.61 0.65
      Hf 4.32 5.49 5.58 8.59 6.07 5.58 4.03
      Ta 2.32 1.64 1.96 3.63 2.87 2.04 1.43
      ΣREE 211 205 207 245 205 218 221
      LREE 186 182 183 221 181 194 196
      HREE 25.1 22.9 23.9 24.2 23.2 24.1 25.1
      LREE/HREE 7.39 7.92 7.65 9.14 7.80 8.07 7.82
      LaN/YbN 8.80 9.43 9.11 13.8 10.0 10.0 9.55
      La/Yb 12.3 13.2 12.7 19.2 14.0 14.0 13.3
      δEu 1.24 1.08 1.13 0.89 1.03 0.98 1.04
      δCe 0.78 0.79 0.80 0.57 0.77 0.79 0.78
      Nb/Ta 4.04 5.51 4.64 4.50 3.56 4.62 6.18
      注:FeO*=FeO+0.998×Fe2O3;A/CNK=Al2O3/(CaO+Na2O+K2O);Mg#=100×Mg/(Mg+ΣFe).
      下载: 导出CSV
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