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    北祁连西段石鸡河地区火山岩地球化学特征及其动力学意义

    刘晓煌 邓军 孙兴丽 刘玖芬 孙柏年 康洪杰

    刘晓煌, 邓军, 孙兴丽, 刘玖芬, 孙柏年, 康洪杰, 2010. 北祁连西段石鸡河地区火山岩地球化学特征及其动力学意义. 地球科学, 35(6): 959-968. doi: 10.3799/dqkx.2010.110
    引用本文: 刘晓煌, 邓军, 孙兴丽, 刘玖芬, 孙柏年, 康洪杰, 2010. 北祁连西段石鸡河地区火山岩地球化学特征及其动力学意义. 地球科学, 35(6): 959-968. doi: 10.3799/dqkx.2010.110
    LIU Xiao-huang, DENG Jun, SUN Xing-li, LIU Jiu-fen, SUN Bai-nian, KANG Hong-jie, 2010. Geochemistry and Tectonic Setting of Lavas from Shijihe Area in Western North Qilian Mountains. Earth Science, 35(6): 959-968. doi: 10.3799/dqkx.2010.110
    Citation: LIU Xiao-huang, DENG Jun, SUN Xing-li, LIU Jiu-fen, SUN Bai-nian, KANG Hong-jie, 2010. Geochemistry and Tectonic Setting of Lavas from Shijihe Area in Western North Qilian Mountains. Earth Science, 35(6): 959-968. doi: 10.3799/dqkx.2010.110

    北祁连西段石鸡河地区火山岩地球化学特征及其动力学意义

    doi: 10.3799/dqkx.2010.110
    基金项目: 

    高等学校学科创新引智计划资助 B07011

    长江学者和创新团队发展计划资助 IRT0755

    详细信息
      作者简介:

      刘晓煌(1972-), 男, 博士, 地质学专业, 主要从事矿产勘查和地球化学研究.E-mail: liuxh19972004@163.com

    • 中图分类号: P597.3;P588.34

    Geochemistry and Tectonic Setting of Lavas from Shijihe Area in Western North Qilian Mountains

    • 摘要: 石鸡河一带是近年新发现的北祁连山多金属成矿带, 气侯和自然条件恶劣, 研究程度很低.该区地层岩性为阳起石岩、角岩和细碧岩; 岩石地球化学和Nd同位素数据显示岩石来源于亏损地幔, 具有N-MORB洋脊玄武岩特征; Sr同位素特征显示地层Sr同位素组成的改变是蚀变引起, 而不是由地壳物质加入引起的.Sm-Nd等时线年龄为481±20 Ma.提出了石鸡河地区地层形成于早奥陶世, 成岩环境为北祁连洋扩张环境, 而非区域资料上显示的残留海盆封闭、大陆碰撞造山环境.

       

    • 图  1  石鸡河地区地质示意图

      1.泥盆-第三纪沉积;2.寒武-志留纪火山沉积;3.中新元古代裂谷沉积;4.古元古代北大河岩群;5.加里东金佛寺岩体;6.研究区范围;7.石炭纪泥岩、砂岩、页岩;8.石炭纪细砂岩、粉砂岩;9.志留纪硬砂岩;10.志留纪千枚岩;11.奥陶纪阳起石岩;12.奥陶纪细碧岩;13.奥陶纪角岩;14.加里东一期花岗岩;15.加里东二期花岗岩;16.断裂;17.矿脉及产状;18.取样位置

      Fig.  1.  Geological sketch map of the Shijihe area

      图  2  阳起绿帘石英角岩(a)、绿帘阳起石岩(b)和绢云母化细碧岩(c)薄片

      单偏光10×5;Q.石英;Act.阳起石;Ep.绿帘石;Pl.钠长石

      Fig.  2.  Actinolitite-chloritization quartz hornstone (a), chloritization actinolitite (b) and sericitization spilite (c)

      图  3  石鸡河地区火山岩SiO2-Nb/Y图解(a)和Zr/TiO2×0.000 1-Nb/Y图解(b)

      Fig.  3.  Diagrams of SiO2-Nb/Y (a) and Zr/TiO2×0.000 1-Nb/Y (b)

      图  4  稀土元素球粒陨石标准化分布型式

      Fig.  4.  Chondrite-normalized rare earth element patterns of the metamorphic basic lava in the Shijihe area

      图  5  石鸡河地区火山岩Sm-Nd同位素等时线年龄

      Fig.  5.  Diagram of Sm-Nd isotopic isochron age of the metamorphic basic lava in the Shijihe area

      图  6  P2O5-TiO2图解

      ORB.洋脊拉斑玄武岩;OIB.洋岛拉斑玄武岩;ALB.碱性玄武岩区

      Fig.  6.  Map of P2O5-TiO2

      表  1  石鸡河地区火山岩主量元素(%)、微量元素(μg/g)含量分析结果

      Table  1.   Geochemical composition of the metamorphic basic lava in the Shijihe area

      项目 08p1 08p2 08p3 08p4 08p5 08p6 08p7 08p8 08p9 N-MORB E-MORB OIB
      SiO2 50.44 49.17 43.85 50.69 51.01 50.66 49.53 49.68 46.71
      TiO2 1.74 1.72 0.84 1.69 1.05 1.73 2.35 1.83 1.28
      Al2O3 13.16 15.84 15.99 17.25 17.19 13.71 17.18 13.82 13.76
      TFe2O3 14.67 13.94 11.13 14.82 13.94 12.25 17.54 13.19 12.34
      MnO 0.17 0.24 0.23 0.22 0.27 0.23 0.12 0.21 0.17
      MgO 3.82 5.64 5.41 3.25 3.77 7.31 1.38 6.92 5.66
      CaO 4.25 7.38 17.15 7.17 6.94 8.99 3.03 9.14 15.24
      Na2O 1.51 4.15 1.04 2.75 3.9 3.36 5 3.42 2.5
      K2O 2.66 0.34 0.67 1.05 0.69 0.6 3.13 0.71 0.22
      P2O5 0.19 0.17 0.11 0.16 0.16 0.16 0.22 0.17 0.12
      LOI 7.84 1.62 3.26 0.87 1.06 1.22 0.69 1.15 1.76
      La 42.1 3.14 2.46 4.51 8.28 3.17 4.97 3.38 2.15 2.5 6.3 37
      Ce 87.4 9.87 5.71 9.09 17.2 10.7 13.2 11.5 7.26 7.5 15 80
      Pr 9.26 1.93 1.42 2.03 2.62 2.06 2.67 2.18 1.52 1.32 2.05 9.7
      Nd 36.2 10.5 7.25 11 12.3 11.3 14.8 12.1 8.09 7.3 9 38.5
      Sm 6.97 3.76 2.52 3.88 3.43 3.98 5.26 4.3 3.07 2.63 2.6 10
      Eu 1.38 1.42 0.91 1.5 1.16 1.36 1.76 1.4 1.13 1.02 0.91 3
      Gd 5.88 4.97 3.23 5.15 4.19 5.23 6.81 5.56 4.11 3.68 2.97 7.62
      Tb 0.89 0.94 0.6 0.98 0.75 0.99 1.26 1.05 0.79 0.67 0.53 1.05
      Dy 5.1 6.31 3.92 6.4 4.83 6.63 8.56 7.04 5.37 4.55 3.55 5.6
      Ho 1.03 1.41 0.87 1.39 1.07 1.5 1.9 1.58 1.21 1.05 0.79 2.62
      Er 2.79 3.9 2.39 3.81 2.95 4.15 5.31 4.37 3.4 2.97 2.31 2.62
      Tm 0.39 0.56 0.35 0.54 0.43 0.6 0.76 0.64 0.5 0.46 0.36 0.35
      Yb 2.63 3.77 2.29 3.56 2.87 4.08 5.08 4.32 3.35 3.05 2.37 2.16
      Lu 0.39 0.56 0.34 0.51 0.43 0.6 0.73 0.63 0.5 0.46 0.35 0.3
      Y 28.7 36.6 23.6 35.2 28.4 40.1 49.6 42.4 33 28 22 29
       
      项目 08p1 08p2 08p3 08p4 08p5 08p6 08p7 08p8 08p9 N-MORB E-MORB OIB
      Sr 90.5 247 531 334 442 128 108 113 248 90 155 660
      Rb 108 17.1 27.2 44 26.8 14 71 17.2 6.64 0.56 5.04 31
      Ba 326 45.9 37.6 69.5 405 48.1 561 26.5 20.7 6.3 57 350
      Cs 4.86 3.23 5.42 6.28 4.6 1.4 2.55 1.67 1.99 0.007 0.063 0.013
      U 2.91 0.17 0.23 0.35 0.55 0.3 0.19 0.19 0.22 0.047 0.18 0.075
      Th 12.8 0.3 0.33 0.23 2.53 0.28 0.38 0.28 0.23 0.12 0.6 4
      Ta 1.13 0.12 0.08 0.09 0.23 0.11 0.09 0.11 0.06 0.13 0.843 3
      Nb 13.3 1.84 1.16 1.44 3.15 1.68 1.48 1.83 1.16 2.33 8.3 48
      Zr 202 107 53.8 99.2 94.4 115 138 120 76.6 74 73 280
      Hf 4.98 2.77 1.59 2.68 2.48 2.92 3.65 3.07 2.08 2.05 3.4 7.8
      Th/Yb 4.87 0.08 0.14 0.06 0.88 0.07 0.07 0.06 0.07 0.04 0.25 1.85
      Th/Nb 0.96 0.16 0.28 0.16 0.8 0.17 0.26 0.15 0.2 0.05 0.07 0.08
      Nb/La 0.32 0.59 0.47 0.32 0.38 0.53 0.3 0.54 0.54 0.93 1.32 1.3
      Hf/Th 0.39 9.23 4.82 11.65 0.98 10.43 9.61 10.96 9.04 17.08 5.67 1.95
      Ce/Nb 0.12 0.93 2.41 1.39 0.65 0.85 0.97 0.87 1.6 3.22 1.81 1.67
      Ti/Y 363 282 213 288 222 259 284 259 232 271 273 593
      La/Ta 37 26 32 53 36 29 58 31 34 19 7 12
      Hf/Ta 4.41 23.08 20.65 31.53 10.78 26.55 42.94 27.91 32.5 15.77 4.03 2.6
      Sm/Nd 0.19 0.36 0.35 0.35 0.28 0.35 0.36 0.36 0.38 0.36 0.29 0.26
      ∑REE 202.41 53.04 34.26 54.35 62.51 56.35 73.07 60.05 42.45 39.16 49.09 200.52
      LREE/HREE 9.6 1.37 1.45 1.43 2.57 1.37 1.4 1.38 1.21 1.32 2.71 7.98
      (La/Yb)n 11.48 0.6 0.77 0.91 2.07 0.56 0.7 0.56 0.46 0.59 1.91 12.29
      (La/Sm)n 3.9 0.54 0.63 0.75 1.56 0.51 0.61 0.51 0.45 0.61 1.56 2.39
      δEu 0.66 1 0.98 1.03 0.94 0.91 0.9 0.88 0.97 1 1 1.05
      测试单位:西北大学大陆动力学国家重点实验室,2009.
      下载: 导出CSV

      表  2  石鸡河地区火山岩Sr-Nd同位素测定值

      Table  2.   Sr-Nd isotopic analyses of the metamorphic basic lava in the Shijihe area

      样号 08p1 08p2 08p3 08p4 08p5 08p6 08p7 08p8 08p9
      Rb 112.62 10.04 35.59 22.99 64.67 4.62 63.94 8.78 9.02
      Sr 90.20 245.00 528.00 332.00 435.00 130.00 110.00 100.00 243.00
      87Rb/86Sr 3.609 9 3.609 9 0.118 2 0.194 4 0.1997 0.428 9 0.102 6 1.678 4 0.253 3
      87Sr/86Sr 0.731 01 0.731 01 0.706 82 0.707 35 0.707 38 0.708 97 0.706 71 0.717 61 0.707 76
      2s 14 14 14 16 23 16 21 18 20
      Nd 10.321 11.211 12.122 11.463 13.501 12.030 8.050
      Sm 1.761 3.860 4.509 4.248 5.091 4.548 3.146
      147Sm/144Nd 0.228 7 0.208 3 0.103 2 0.228 1 0.225 1 0.224 1 0.236 3
      143Nd/144Nd 0.513 121 0.513 055 0.512 723 0.513 118 0.513 101 0.513 108 0.513 141
      2σ 17 13 15 13 15 13 18
      Rb/Sr 1.25 0.04 0.07 0.07 0.15 0.04 0.58 0.09 0.04
      Sm/Nd 0.17 0.34 0.37 0.37 0.38 0.38 0.39
      εSr(t) 34 30 30 30 30 30 31 30 29
      εNd(t) 7.5 7.4 7.4 7.5 7.3 7.5 7.4
      εSr(0) 376 33 40 41 64 31 186 46 32
      εNd(0) 9.4 8.1 1.7 9.4 9.0 9.2 9.8
      测试单位:西北大学大陆动力学国家重点实验室,2009.Sr-Nd同位素测定时t=480 Ma;Rb、Sr、Nd和Sm单位为10-6.
      下载: 导出CSV
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    • 收稿日期:  2010-05-26
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