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    北阿尔金南华纪双峰式火山岩的发现及构造意义

    刘函 王国灿 曹树钊 罗彦军 高睿 黄文星

    刘函, 王国灿, 曹树钊, 罗彦军, 高睿, 黄文星, 2012. 北阿尔金南华纪双峰式火山岩的发现及构造意义. 地球科学, 37(5): 917-928. doi: 10.3799/dqkx.2012.100
    引用本文: 刘函, 王国灿, 曹树钊, 罗彦军, 高睿, 黄文星, 2012. 北阿尔金南华纪双峰式火山岩的发现及构造意义. 地球科学, 37(5): 917-928. doi: 10.3799/dqkx.2012.100
    LIU Han, WANG Guo-can, CAO Shu-zhao, LUO Yan-jun, GAO Rui, HUANG Wen-xing, 2012. Discovery of Nanhuaian Bimodal Volcanics in Northern Altyn Tagh and Its Tectonic Significance. Earth Science, 37(5): 917-928. doi: 10.3799/dqkx.2012.100
    Citation: LIU Han, WANG Guo-can, CAO Shu-zhao, LUO Yan-jun, GAO Rui, HUANG Wen-xing, 2012. Discovery of Nanhuaian Bimodal Volcanics in Northern Altyn Tagh and Its Tectonic Significance. Earth Science, 37(5): 917-928. doi: 10.3799/dqkx.2012.100

    北阿尔金南华纪双峰式火山岩的发现及构造意义

    doi: 10.3799/dqkx.2012.100
    基金项目: 

    中国地质调查局项目 1212011121261

    中国地质调查局项目 1212010610103

    详细信息
      作者简介:

      刘函(1986-), 男, 硕士, 构造地质学专业, 主要从事青藏高原及造山带地质学方面工作.E-mail: liuhan_cug@163.com

      通讯作者:

      王国灿, E-mail: wgcan@cug.edu.cn

    • 中图分类号: P541

    Discovery of Nanhuaian Bimodal Volcanics in Northern Altyn Tagh and Its Tectonic Significance

    • 摘要: 北阿尔金恰什坎萨伊沟南口火山岩显双峰式特征, 由变玄武岩和变流纹岩组成.地球化学分析表明变玄武岩源自富集地幔, 上侵过程中遭受地壳混染, 形成于大陆裂谷环境; 而变流纹岩与铝质A型花岗岩特征类似, 为幔源岩浆底侵下地壳部分熔融成因.变流纹岩锆石LA-ICP-MS U-Pb年龄为749.8±4.6 Ma, 代表火山岩的喷发年龄, 为北阿尔金洋的初始裂解事件提供了时代证据; 与北祁连洋初始裂解时代相近, 从洋盆的初始裂解时间证明北阿尔金与北祁连同为一个带."西域板块"新元古代中期岩浆活动与Rodinia超大陆裂解事件密切相关, 与扬子板块周缘岩浆活动有相似性, 可划分为裂解初期与峰期两个阶段.所发现北阿尔金南华纪双峰式火山岩正是Rodinia超大陆裂解峰期岩浆活动的产物.

       

    • 图  1  研究区地质简图(据1∶20万巴什考贡幅地质图修编)

      Ⅰ.准葛尔-吐哈陆块;Ⅱ.伊利陆块;Ⅲ.塔里木陆块;Ⅳ.阿中陆块;Ⅴ.敦煌陆块;Ⅵ.巴颜喀拉山陆块;Ⅶ.柴达木陆块;Ⅷ.祁连陆块;Ⅸ.阿拉善陆块;NAS.北阿尔金蛇绿混杂岩带;SAS.南阿尔金蛇绿混杂岩带;NQCS.柴北缘蛇绿混杂岩带;NQLS.北祁连蛇绿混杂岩带

      Fig.  1.  Region geological map for this study area

      图  2  恰什坎萨伊沟双峰式火山岩剖面及采样点

      Fig.  2.  Geological section of Qiashikansayi bimodal volcanic rocks and samples locations

      图  3  样品TR051-3-2锆石阴极发光图像与LA-ICP-MS U-Pb年龄协和图

      Fig.  3.  CL images and LA-ICP-MS U-Pb Concordia diagram of zircons from Sample TR051-3-2

      图  4  恰什坎萨伊沟南华纪火山岩Nb/Y-Zr/TiO2分类图解(底图据Winchester and Floyd, 1977)

      Fig.  4.  Diagram of Nb/Y-Zr/TiO2 of bimodal volcanic rocks from Qiashikansayi

      图  5  恰什坎萨伊沟双峰式火山岩稀土元素分配形式图与微量元素蛛网图

      a、b为流纹岩,c、d为玄武岩;OYC-563(Yellowstone)和98-183(Ethopia)流纹岩数据引自Hildreth et al.(1991)Ayalew and Yirgu(2003);196(Ethopia)玄武岩数据引自Kieffer et al.(2004);球粒陨石、原始地幔数据引自Sun and McDonough(1989)

      Fig.  5.  Primitive mantle normalized trace elements pattern and chondrite normalized rare earth elements pattern for bimodal volcanic rocks

      图  6  玄武岩Ta/Yb-Th/Yb图解(底图据夏林圻等,2007)

      Fig.  6.  Diagram of Th/Yb-Ta/Yb for basalts

      图  7  恰什坎萨伊沟双峰式火山岩构造判别图解(底图据夏林圻等,2007Förster et al., 1997)

      Fig.  7.  Diagram of Zr-Zr/Y (a) for basalts and Rb-(Y+Nb) (b) for rhyolites

      表  1  恰什坎萨伊沟变流纹岩(TR051-3-2)锆石LA-ICP-MS U-Pb定年结果

      Table  1.   Zircon LA-ICP-MS U-P isotopic dates of metarhyolite (TR051-3-2) at the Qiashikansayi

      Spot Th(10-6) U(10-6) 232Th/238U 207Pb/206Pb err
      207Pb/235U err
      206Pb/238U err
      206Pb/238U
      (Ma)
      err
      1 95 174 0.50 0.071 1 0.28 1.208 5 4.72 0.123 4 0.16 750 9
      2 65 129 0.45 0.067 2 0.28 1.128 3 4.51 0.122 6 0.19 746 11
      3 112 171 0.59 0.070 5 0.25 1.189 7 4.12 0.122 5 0.15 745 9
      4 110 183 0.53 0.067 2 0.23 1.142 2 4.06 0.123 0 0.17 748 10
      5 402 390 0.92 0.062 8 0.17 1.072 8 2.99 0.123 2 0.14 749 8
      6 79 151 0.49 0.066 2 0.26 1.133 5 4.43 0.124 1 0.15 754 9
      7 82 171 0.44 0.067 8 0.26 1.140 0 4.18 0.122 8 0.15 747 9
      8 111 42 2.38 0.106 7 0.85 0.613 3 4.86 0.044 5 0.14 280 8
      9 69 142 0.44 0.067 3 0.26 1.134 3 4.12 0.123 0 0.16 748 9
      10 125 203 0.52 0.063 0 0.22 1.104 7 4.01 0.127 0 0.17 771 10
      11 75 153 0.42 0.062 3 0.28 1.053 2 4.66 0.122 8 0.17 747 10
      12 102 169 0.55 0.065 7 0.23 1.178 5 4.18 0.129 6 0.16 786 9
      13 92 165 0.51 0.060 8 0.25 1.049 8 4.16 0.125 0 0.15 759 9
      14 62 118 0.52 0.061 7 0.27 1.137 3 5.23 0.122 7 0.18 746 10
      15 39 99 0.35 0.067 9 0.34 1.130 7 5.48 0.122 0 0.21 742 12
      16 141 206 0.59 0.072 0 0.39 1.239 8 6.42 0.125 0 0.18 759 10
      17 87 158 0.50 0.136 8 7.05 2.350 6 121.60 0.124 3 0.14 755 8
      18 125 227 0.49 0.062 9 0.22 1.085 7 3.77 0.124 6 0.15 757 9
      19 195 262 0.61 0.065 9 0.26 1.098 4 4.30 0.120 3 0.14 732 8
      20 73 132 0.49 0.064 9 0.30 1.111 0 4.96 0.123 7 0.17 752 10
      下载: 导出CSV

      表  2  恰什坎萨伊沟双峰式火山岩主量(%)及微量元素(10-6)分析结果

      Table  2.   Chemical compositions of bimodal volcanic rocks at the Qiashikansayi

      样品 TR051-2-2 TR051-2-3 TR051-5-1 TR051-3-2 TR051-4-1
      岩性 玄武岩 玄武岩 玄武岩 流纹岩 流纹岩
      SiO2 49.96 51.11 52.62 75.46 77.88
      TiO2 0.7 1.91 2.28 0.24 0.17
      Al2O3 15.35 12.73 11.23 12.45 10.97
      Fe2O3 10.26 16.24 18.13 1.37 2.12
      MnO 0.19 0.16 0.14 0.02 0.01
      MgO 6.67 4.73 3.27 0.67 0.24
      CaO 5.95 5.08 3.93 0.91 0.35
      Na2O 3.3 2.85 2.93 2.51 0.16
      K2O 3.96 2.06 1.47 4.05 6.11
      P2O5 0.06 0.16 0.22 0.03 0.02
      LOI 3.34 2.73 3.62 1.89 1.59
      Total 99.74 99.78 99.86 99.59 99.61
      Mg# 57 37 27 49 18
      Ba 1004 449 285 1259 1798
      Rb 105 71.61 58.03 126 162
      Sr 361 145 93.92 54.82 61.6
      Y 23.15 42.86 46.82 57.49 51.7
      Zr 85.62 166 183 495 366
      Nb 12.99 10.42 14.79 45.19 58.14
      Th 3.13 6.56 5.54 12.89 15.08
      Ga 18.86 19.56 20.64 18.86 17.24
      Ni 76.1 18.35 12.33 2.95 10.37
      Hf 2.3 4.37 4.86 12.35 9.85
      Ta 0.53 0.78 0.95 3.16 4.19
      U 0.94 1.68 1.79 2.19 2.07
      La 13.04 17.11 21.23 63.5 58.68
      Ce 26.97 39.69 46.46 128 120
      Pr 3.21 5.27 6.06 15.89 15.3
      Nd 12.57 22.18 25.43 59.53 58.44
      Sm 2.97 5.72 6.44 10.91 11.63
      Eu 0.74 1.59 1.88 2.22 2.6
      Gd 3.26 6.62 7.6 9.58 10.16
      Tb 0.54 1.08 1.21 1.41 1.53
      Dy 3.72 7.35 7.87 9.41 9.48
      Ho 0.86 1.63 1.76 2.12 2.02
      Er 2.47 4.34 4.99 5.96 5.62
      Tm 0.38 0.67 0.74 0.93 0.86
      Yb 2.54 4.36 4.89 6.27 5.69
      Lu 0.41 0.69 0.77 1 0.9
      注:Mg# =[Mg2+/(Mg2++Fe2+(total))]×100.
      下载: 导出CSV
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    • 收稿日期:  2011-10-12
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