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    西藏雅鲁藏布江缝合带西段达巴蛇绿岩年代学、地球化学特征及其构造意义

    程晨 夏斌 郑浩 袁亚娟 殷征欣 陆野 徐迟 张霄

    程晨, 夏斌, 郑浩, 袁亚娟, 殷征欣, 陆野, 徐迟, 张霄, 2018. 西藏雅鲁藏布江缝合带西段达巴蛇绿岩年代学、地球化学特征及其构造意义. 地球科学, 43(4): 975-990. doi: 10.3799/dqkx.2018.703
    引用本文: 程晨, 夏斌, 郑浩, 袁亚娟, 殷征欣, 陆野, 徐迟, 张霄, 2018. 西藏雅鲁藏布江缝合带西段达巴蛇绿岩年代学、地球化学特征及其构造意义. 地球科学, 43(4): 975-990. doi: 10.3799/dqkx.2018.703
    Cheng Chen, Xia Bin, Zheng Hao, Yuan Yajuan, Yin Zhengxin, Lu Ye, Xu Chi, Zhang Xiao, 2018. Chronology, Geochemistry and Tectonic Significance of Daba Ophiolites in Western Segment of Yarlung Zangbo Suture Zone, Tibet. Earth Science, 43(4): 975-990. doi: 10.3799/dqkx.2018.703
    Citation: Cheng Chen, Xia Bin, Zheng Hao, Yuan Yajuan, Yin Zhengxin, Lu Ye, Xu Chi, Zhang Xiao, 2018. Chronology, Geochemistry and Tectonic Significance of Daba Ophiolites in Western Segment of Yarlung Zangbo Suture Zone, Tibet. Earth Science, 43(4): 975-990. doi: 10.3799/dqkx.2018.703

    西藏雅鲁藏布江缝合带西段达巴蛇绿岩年代学、地球化学特征及其构造意义

    doi: 10.3799/dqkx.2018.703
    基金项目: 

    中国地质调查局青藏专项 1212011121259

    国家自然科学基金项目 41372208

    详细信息
      作者简介:

      程晨(1988-), 女, 博士后, 主要从事岩石学和地球化学研究

      通讯作者:

      夏斌

    • 中图分类号: P597

    Chronology, Geochemistry and Tectonic Significance of Daba Ophiolites in Western Segment of Yarlung Zangbo Suture Zone, Tibet

    • 摘要: 达巴蛇绿岩位于雅鲁藏布江蛇绿岩带西段南亚带,主要由地幔橄榄岩、基性岩脉和硅质岩组成,其形成时代和构造背景尚不清楚.首次报道了达巴蛇绿岩中基性岩脉的岩石学、锆石U-Pb年代学、全岩地球化学数据.达巴辉长岩和辉绿岩具有高的Al和Mg、低Ti、K和P,为低钾钙碱性玄武质岩石.岩石具有与N-MORB一致的稀土配分模式,但是N-MORB标准化蛛网图中显示Nb负异常,显示了受到俯冲板片流体的影响.辉绿岩的锆石U-Pb年龄为120.0±1.7 Ma,为早白垩世晚期,地球化学特征显示源自于低程度的尖晶石相地幔源区的部分熔融.结合前人研究成果,认为达巴蛇绿岩形成于与初始俯冲有关的弧前扩张中心,是受到俯冲板片流体交代的上覆地幔楔部分熔融的产物.

       

    • 图  1  研究区区域地质简图

      a.雅鲁藏布江缝合带和班公湖-怒江缝合带蛇绿岩分布简图;b.达巴蛇绿岩区域地质简图.据张双增等(2005)编1:25万日新-札达县-姜叶马幅区域地质调查报告及地质图;Yin and Harrison(2000); Zhang et al.(2012, 2014)修改

      Fig.  1.  Geological sketch map of the research region

      图  2  达巴蛇绿岩剖面图(a)和野外照片(b, c, d)

      Fig.  2.  The geological section (a) and field photographs (b, c, d) of Daba ophiolites

      图  3  达巴蛇绿岩显微镜下照片

      a.蛇纹石化方辉橄榄岩;b.辉长岩;c.辉绿岩;d.放射虫硅质岩;Opx.斜方辉石;Cpx.单斜辉石;Pl.斜长石;Rad.放射虫

      Fig.  3.  Microstructure photographs of Daba ophiolites

      图  4  达巴辉绿岩锆石阴极发光图

      Fig.  4.  Cathodoluminescence (CL) images of zircons for Daba dolerite

      图  5  达巴辉绿岩锆石U-Pb年龄谐和图(a)和加权平均年龄(b)

      Fig.  5.  U-Pb age concordia plots (a) and weight average results (b) for Daba dolerite

      图  6  达巴蛇绿岩中基性岩Zr/TiO2×10-4-Nb/Y(a)和P2O5-Zr(b)图解

      图a据Winchester and Floyd(1977);图b据Winchester and Floyd(1976).Rhyolite+Dacite.流纹岩+英安岩;Alkali Rhyolite.碱性流纹岩;Phonolite.响岩;Trachyte.粗面岩;And/BasAnd.安山岩/玄武安山岩;Trachy/And.粗面安山岩;Tephri-Phonolite.碱玄岩+响岩;Subalkaline Basalt.亚碱性玄武岩;Alkaline basalt=Alk-Bas.碱性玄武岩;Foidite.副长岩;Tholeiitic basalt.拉斑玄武岩

      Fig.  6.  Zr/TiO2×10-4-Nb/Y (a) and P2O5-Zr (b) diagrams from mafic rocks in the Daba ophiolites

      图  7  达巴基性岩稀土(a)和微量元素(b)特征曲线

      标准化值据Sun and McDonough(1989);Barren岛弧玄武岩数据来源于Luhr and Haldar(2006);IBM弧前玄武岩源于Reagan et al.(2010);日喀则弧前玄武岩源于Dai et al.(2013)

      Fig.  7.  Chondrite-normalized REE (a) and N-MORB-normalized trace element (b) diagrams for the mafic rocks in Daba ophiolites

      图  8  达巴辉绿岩的La-La/Sm (a)和La/Sm-Sm/Yb (b)图解

      Aldanmaz et al.(2000)

      Fig.  8.  The La-La/Sm (a) and La/Sm-Sm/Yb (b) diagrams for dolerites in Daba ophiolites

      图  9  达巴辉绿岩的Th/Yb vs. Nb/Yb (a) and TiO2/Yb vs. Nb/Yb (b)图解

      Pearce(2008)修改

      Fig.  9.  The Th/Yb vs. Nb/Y (a) and TiO2/Yb vs. Nb/Yb (b) diagrams for dolerites in Daba ophiolites

      图  10  达巴辉绿岩的Th/Nb vs. U/Th和Th/Nb vs. Th/Ce图解

      Singer et al.(2008)修改

      Fig.  10.  The Th/Nb vs. U/Th and Th/Nb vs. Th/Ce diagrams for dolerites in Daba ophiolites

      图  11  达巴辉绿岩构造环境判别图解

      a.Nb×2-Zr/4-Y图解,据Meschede(1986);b.Ti/1000-V图解,据Shervais(1982);c.Y/15-La/10-Nb/8图解,据Cabanis and Lecolle(1989);d.NbN-ThN图解,据Saccani(2015).IBM弧前玄武岩数据源自Reagan et al.(2010);日喀则弧前玄武岩源自Dai et al.(2013).N-MORB.正常大洋中脊玄武岩;E-MORB.富集大洋中脊玄武岩;OIB.洋岛玄武岩;IAT.岛弧拉斑玄武岩;BABB.弧后盆地玄武岩;FAB.弧前玄武岩;WPB.板内玄武岩;VAB.火山弧玄武岩;AB.碱性洋岛玄武岩

      Fig.  11.  Discrimination diagrams for the dolerites in Daba ophiolites

      表  1  达巴辉绿岩锆石U-Pb同位素分析结果

      Table  1.   Analytical results of zircon U-Pb isotopes from Daba dolerite

      测试点 元素(10-6) Th/ U 同位素比值 年龄(Ma)
      Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/235U 1σ 206Pb/238U 1σ
      DBN-23(达巴辉绿岩)
      DBN23-1 72 150 0.48 0.048 77 0.004 60 0.125 71 0.011 09 0.018 80 0.000 38 120.2 10.0 120.1 2.4
      DBN23-2 225 254 0.89 0.046 74 0.005 11 0.115 74 0.012 19 0.017 87 0.000 39 111.2 11.1 114.2 2.5
      DBN23-3 306 551 0.56 0.052 94 0.003 44 0.131 73 0.008 15 0.017 95 0.000 30 125.7 7.3 114.7 1.9
      DBN23-4 45 102 0.44 0.052 12 0.007 21 0.126 46 0.016 83 0.018 85 0.000 59 120.9 15.2 120.4 3.7
      DBN23-5 180 144 1.25 0.051 30 0.007 73 0.125 46 0.017 72 0.017 97 0.000 45 120.0 16.0 114.8 2.9
      DBN23-6 83 130 0.64 0.051 80 0.005 48 0.133 71 0.012 03 0.019 68 0.000 42 127.4 10.8 125.6 2.6
      DBN23-7 101 152 0.66 0.048 46 0.005 38 0.124 44 0.012 98 0.019 13 0.000 43 119.1 11.7 122.2 2.8
      DBN23-8 131 300 0.44 0.047 96 0.003 71 0.125 46 0.008 61 0.019 40 0.000 35 120.0 7.8 123.8 2.2
      DBN23-9 285 424 0.67 0.049 68 0.003 83 0.129 64 0.009 51 0.018 90 0.000 30 123.8 8.5 120.7 1.9
      DBN23-10 208 362 0.58 0.048 62 0.003 44 0.128 32 0.009 00 0.019 06 0.000 28 122.6 8.1 121.7 1.8
      DBN23-11 84 189 0.44 0.048 95 0.004 35 0.123 07 0.009 72 0.018 69 0.000 37 117.9 8.8 119.3 2.3
      DBN23-12 123 258 0.47 0.049 03 0.004 80 0.124 93 0.010 91 0.018 81 0.000 37 119.5 9.8 120.1 2.3
      DBN23-13 128 191 0.67 0.048 81 0.005 78 0.124 28 0.012 64 0.019 21 0.000 45 118.9 11.4 122.7 2.8
      DBN23-14 87 137 0.64 0.050 06 0.008 03 0.117 20 0.012 61 0.019 25 0.000 54 112.5 11.5 122.9 3.4
      DBN23-15 104 140 0.74 0.051 16 0.007 11 0.125 18 0.015 62 0.019 13 0.000 54 119.8 14.1 122.1 3.4
      DBN23-16 122 272 0.45 0.049 22 0.003 88 0.129 99 0.010 32 0.018 55 0.000 41 124.1 9.3 118.5 2.6
      DBN23-17 120 270 0.44 0.048 60 0.003 54 0.130 11 0.009 43 0.018 81 0.000 36 124.2 8.5 120.2 2.3
      SRM 610 458.5 461.9 421.9 0.902 46 0.032 00 26.866 57 0.906 81 0.213 77 0.002 49 3 378.6 33.1 1 248.9 13.3
      SRM 610 455.9 461.1 430.4 0.899 29 0.029 61 26.703 17 0.835 53 0.213 27 0.002 42 3 372.6 30.7 1 246.2 12.9
      Temorastd 166.9 424.1 0.0 0.056 43 0.002 81 0.526 66 0.025 59 0.066 79 0.001 03 429.6 17.0 416.8 6.2
      Temorastd 32.1 62.8 0.0 0.053 97 0.004 80 0.488 94 0.041 69 0.066 81 0.001 54 404.2 28.4 416.9 9.3
      QINGHU 463.5 856.6 0.0 0.049 84 0.002 41 0.169 11 0.008 27 0.024 54 0.000 39 158.6 7.2 156.3 2.5
      Temorastd 83.9 187.4 0.0 0.054 29 0.003 03 0.501 61 0.028 49 0.066 80 0.001 03 412.8 19.3 416.9 6.2
      Temorastd 36.3 92.2 1.2 0.056 11 0.003 99 0.513 99 0.036 03 0.066 80 0.001 28 421.1 24.2 416.8 7.8
      QINGHU 234.8 503.8 0.1 0.047 08 0.002 54 0.179 58 0.009 66 0.027 25 0.000 41 167.7 8.3 173.3 2.6
      Temorastd 42.0 75.9 1.4 0.054 67 0.004 45 0.501 40 0.037 80 0.066 86 0.001 14 412.7 25.6 417.2 6.9
      Temorastd 145.1 284.5 0.3 0.055 73 0.002 91 0.514 20 0.025 35 0.066 74 0.000 98 421.3 17.0 416.5 6.0
      SRM 610 459.8 464.8 434.6 0.868 60 0.031 03 25.548 86 0.846 46 0.211 11 0.002 13 3 329.4 32.5 1 234.8 11.3
      SRM 610 454.6 458.2 417.7 0.872 83 0.027 76 25.784 05 0.772 54 0.211 93 0.002 00 3 338.4 29.4 1 239.1 10.6
      QINGHU 409.2 909.5 0.9 0.046 05 0.002 01 0.151 09 0.006 87 0.023 65 0.000 36 142.9 6.1 150.7 2.2
      Temorastd 47.7 178.6 0.9 0.056 23 0.002 86 0.520 53 0.026 77 0.066 75 0.001 03 425.5 17.9 416.6 6.2
      Temorastd 102.7 200.1 0.0 0.054 17 0.002 78 0.495 07 0.025 60 0.066 85 0.001 09 408.4 17.4 417.1 6.6
      QINGHU 335.4 651.3 0.7 0.050 24 0.002 49 0.175 55 0.008 59 0.025 24 0.000 42 164.2 7.4 160.7 2.6
      Temorastd 41.1 81.3 0.0 0.056 45 0.004 01 0.517 17 0.033 92 0.066 78 0.001 33 423.3 22.7 416.7 8.1
      Temorastd 64.0 233.7 1.0 0.053 95 0.003 40 0.498 43 0.031 26 0.066 82 0.001 11 410.6 21.2 417.0 6.7
      下载: 导出CSV

      表  2  达巴辉长岩、辉绿岩主量元素(%)和微量元素(10-6)含量

      Table  2.   Major (%) and trace element (10-6) contents for gabbro and dolerite from the Daba ophiolites

      样品 DBN-1
      辉长岩
      DBN-4
      辉长岩
      DBN-5
      辉长岩
      DBN-23
      辉绿岩
      13DBN24
      辉绿岩
      DBN-25
      辉绿岩
      DBN-26
      辉绿岩
      DBN-27
      辉绿岩
      DBN-38
      异剥钙榴岩化辉绿岩
      SiO2 47.30 45.27 45.91 47.12 46.83 45.88 46.17 49.77 29.70
      TiO2 0.37 0.59 0.85 0.57 0.53 0.53 0.72 0.95 1.20
      Al2O3 12.91 14.43 15.82 13.04 13.38 14.56 13.78 14.52 12.77
      Fe2O3T 6.05 8.02 4.58 7.20 6.45 8.01 7.42 7.87 10.83
      MnO 0.12 0.13 0.08 0.14 0.14 0.14 0.17 0.14 0.20
      MgO 10.03 8.76 6.38 9.94 8.92 9.15 9.32 5.75 11.25
      CaO 18.83 17.75 21.90 18.40 19.66 17.80 17.85 15.35 23.94
      Na2O 0.19 0.19 0.14 0.28 0.21 0.20 0.18 2.20 0.01
      K2O 0.02 0.03 0.01 0.03 0.04 0.03 0.01 0.03 0.01
      P2O5 0.02 0.03 0.10 0.04 0.03 0.04 0.06 0.08 0.11
      LOI 4.12 4.47 3.86 3.76 3.94 4.16 4.19 2.83 9.55
      Total 99.98 99.71 99.67 100.60 100.15 100.54 99.92 99.53 99.60
      Mg# 79.44 71.80 76.45 76.29 76.32 72.69 74.54 63.00 70.80
      Ti 2218 3536 5095 3417 3177 3177 4316 5694 7193
      V 191 269 216 167 233 197 180 211 294
      Cr 195 249 90 350 276 170 190 50 140
      Ga 9.36 10.60 16.00 9.40 10.60 9.60 13.90 14.30 4.20
      Rb 0.75 0.76 0.30 0.30 0.47 0.20 0.20 0.50 0.09
      Sr 22.6 24.2 26.3 23.6 27.5 20.8 45.0 52.2 20.9
      Y 10.4 12.8 23.9 13.5 13.4 12.7 16.9 19.6 27.1
      Zr 20 32 69 35 32 30 52 64 84
      Nb 0.50 1.04 1.00 0.40 2.40 0.40 0.60 0.90 1.30
      Cs 0.05 0.11 0.02 0.03 0.05 0.06 0.01 0.05 0.01
      Ba 9.41 11.20 9.30 11.30 20.70 6.00 22.40 11.00 49.00
      La 0.93 0.98 2.30 1.20 1.03 0.90 1.70 2.00 2.92
      Ce 2.67 3.30 7.50 3.80 3.39 3.10 5.80 6.30 10.10
      Pr 0.38 0.44 1.21 0.62 0.51 0.51 0.95 0.97 1.48
      Nd 2.02 2.54 6.70 3.60 2.88 3.20 5.10 5.60 7.64
      Sm 0.74 0.98 2.30 1.38 1.06 1.18 1.64 1.86 2.58
      Eu 0.32 0.35 0.80 0.54 0.41 0.37 0.61 0.66 0.93
      Gd 1.11 1.44 3.34 1.96 1.41 1.65 2.36 2.82 2.85
      Tb 0.20 0.28 0.60 0.33 0.27 0.31 0.45 0.50 0.59
      Dy 1.40 1.77 4.04 2.36 1.90 2.26 3.03 3.38 3.99
      Ho 0.31 0.40 0.91 0.54 0.40 0.47 0.66 0.78 0.95
      Er 0.93 1.15 2.72 1.60 1.17 1.47 2.01 2.29 2.55
      Tm 0.13 0.18 0.40 0.24 0.17 0.23 0.29 0.34 0.42
      Yb 0.92 1.19 2.73 1.46 1.13 1.50 1.82 2.20 2.38
      Lu 0.13 0.18 0.39 0.22 0.18 0.24 0.28 0.35 0.39
      Hf 0.54 0.87 1.90 0.90 0.72 0.90 1.50 1.80 1.77
      Ta 0.09 1.28 0.10 0.10 6.14 0.10 0.10 0.10 0.12
      Th 0.17 0.20 0.16 0.10 0.10 0.08 0.12 0.24 0.08
      U 0.30 0.21 0.07 0.05 0.22 0.05 0.05 0.10 0.86
      ∑REE 12.19 15.18 35.94 19.85 15.91 17.39 26.70 30.05 39.76
      ∑LREE 7.06 8.59 20.81 11.14 9.28 9.26 15.80 17.39 25.65
      ∑HREE 5.13 6.58 15.13 8.71 6.63 8.13 10.90 12.66 14.11
      δEu 1.08 0.90 0.88 1.00 1.03 0.81 0.95 0.88 1.05
      下载: 导出CSV

      表  3  雅鲁藏布江缝合带西段蛇绿岩同位素年龄

      Table  3.   Summary of ages and tectonic settings of the Yarlung Zangbo ophiolite

      地点 年龄(Ma) 测年手段 对象岩性 形成环境 文献来源
      达巴 120.0 ±1.7(MSWD=1.8) 锆石LA-ICP-MS U-Pb 辉绿岩 SSZ(fore-arc) 本文
      东波 130±0.5(MSWD=1.6) 锆石LA-ICP-MS U-Pb 辉石岩 形成于M0R,经历了SSZ 熊发挥等, 2011
      128±1.1(MSWD=1.3) 辉长岩
      120.9±1.5(MSWD=3.7) 锆石LA-ICP-MS U-Pb 辉长岩 SSZ 夏斌,未发表
      120.2±2.3(MSWD=0.71) 锆石SHRIMP U-Pb 辉绿岩 无描述 李建峰等, 2008
      130.0±3.0(MSWD=1.06) 锆石LA-ICP-MS U-Pb 辉长岩 M0R 刘钊等, 2011
      拉昂错 118.8 ± 1.8(MSWD=1.12) 锆石SHRIMP 辉绿岩 成熟的弧后盆地(洋内俯冲体系) 夏斌等, 2008
      120.5±1.9(MSWD=0.73) 锆石SHRIMP U-Pb 辉绿岩
      125.1±2.0(MSWD=1.6) 锆石LA-ICP-MS U-Pb 辉绿岩 SSZ 夏斌, 未发表
      125.6±2.4(MSWD=1.5) 锆石LA-ICP-MS U-Pb 辉绿岩 (洋内弧前) Zheng et al., 2017
      巴尔 126.3±2.4(MSWD=0.95)
      128.1±2.1(MSWD=0.2) 锆石SHRIMP U-Pb 角闪辉长岩 SSZ(洋内弧前) 刘飞等,2015a
      错不扎 127.0 ± 0.5(MSWD=0.78) 锆石LA-ICP-MS U-Pb 辉绿岩 SSZ(洋内俯冲体系) 刘飞等, 2015b
      加纳崩 125.8±2.6(MSWD=0.78) 锆石LA-ICP-MS U-Pb 辉长岩 SSZ(洋内俯冲体系) 刘飞等,2015b
      萨嘎 127.8±2.6(MSWD=3.6) 角闪石40Ar/39Ar 角闪岩(原岩亚碱性基性岩) 变质冷却年龄,二次洋内俯冲 Guilmette et al., 2012
      127.9±2.5(MSWD=0.57)
      123.5±1.0(MSWD=1.5) 石梢石一单斜辉石角闪岩(原岩亚碱性基性岩)
      128.9 ± 1.3(MSWD=0-55)
      下载: 导出CSV
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