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    埃塞俄比亚施瑞地区花岗岩地球化学特征及构造环境

    韩世礼 张术根 柳建新 丁俊 张文山

    韩世礼, 张术根, 柳建新, 丁俊, 张文山, 2014. 埃塞俄比亚施瑞地区花岗岩地球化学特征及构造环境. 地球科学, 39(1): 10-20. doi: 10.3799/dqkx.2014.002
    引用本文: 韩世礼, 张术根, 柳建新, 丁俊, 张文山, 2014. 埃塞俄比亚施瑞地区花岗岩地球化学特征及构造环境. 地球科学, 39(1): 10-20. doi: 10.3799/dqkx.2014.002
    Han Shili, Zhang Shugen, Liu Jianxin, Ding Jun, Zhang Wenshan, 2014. Geochemistry and Tectonic Setting of Granites from Shire Region, Ethiopia. Earth Science, 39(1): 10-20. doi: 10.3799/dqkx.2014.002
    Citation: Han Shili, Zhang Shugen, Liu Jianxin, Ding Jun, Zhang Wenshan, 2014. Geochemistry and Tectonic Setting of Granites from Shire Region, Ethiopia. Earth Science, 39(1): 10-20. doi: 10.3799/dqkx.2014.002

    埃塞俄比亚施瑞地区花岗岩地球化学特征及构造环境

    doi: 10.3799/dqkx.2014.002
    基金项目: 

    国家自然科学基金项目 41174103

    2010年国外矿产资源风险勘查专项资金项目 管理财[2010]211号

    详细信息
      作者简介:

      韩世礼(1979-), 男, 博士研究生, 矿产普查与勘探专业

      通讯作者:

      张术根, E-mail: zhangshugenzsg@163.com

    • 中图分类号: P588.12;P595;P597

    Geochemistry and Tectonic Setting of Granites from Shire Region, Ethiopia

    • 摘要: 埃塞俄比亚北部施瑞地区具有造山前、造山期和造山后3种花岗岩类型, 全岩Sm-Nd等时线测年结果表明, 造山前和造山后花岗岩成岩年龄分别为824.4±15.5 Ma和517.9±5.8 Ma.3类花岗岩主量元素和稀土微量元素成分存在明显差异, 其中造山前花岗岩属于低钾过铝质花岗岩, 稀土分配模式属轻稀土弱富集型, 富集大离子亲石元素, 亏损P和Ti高场强元素;造山期花岗岩为准铝质高钾钙碱性花岗岩, 稀土分配模式属轻稀土富集型, 富集大离子亲石元素和高场强元素;造山后花岗岩为弱过铝质高钾钙碱性花岗岩, 稀土分配模式具强烈铕亏损的海鸥型, 富集大离子亲石元素, 明显亏损P和Ti高场强元素.综合研究表明: 造山前和造山期花岗岩均为I型幔源花岗岩, 构造环境处于被动大陆边缘-火山岛弧环境;造山后花岗岩为A2型壳源主花岗岩, 是在洋盆关闭和阿拉伯-努比亚地盾成熟后, 由减薄的地壳部分熔融产生.

       

    • 图  1  埃塞俄比亚施瑞地区地质简图

      Fig.  1.  Geological sketch map of the Shire region in northern Ethiopia

      图  2  造山前(a~c)、造山期(d~f)和造山后(g~i)花岗岩野外及镜下照片

      a.灰白色花岗闪长岩;b.整体结构;c.定向排列的鳞片状黑云母;d.灰白色黑云母花岗岩;e.钠长石穿插微斜长石;f.黑云母交代角闪石;g.肉红色钾长花岗岩;h.石英与钠长石;i.锆石

      Fig.  2.  Photos of pre-(a-c), syn-(d-f), and post-(g-i)orogenic granitoids in the field and under microscope

      图  3  花岗岩K2O-SiO2图解(a)和A/NK-A/CNK图解(b)(据Maniar and Piccoli, 1989)

      Fig.  3.  K2O-SiO2 diagram (a) and A/NK-A/CNK classification diagram(b) for granitoids

      图  4  造山前、造山期和造山后花岗岩稀土元素球粒陨石标准化图解(a~c)和微量元素蛛网图(d~f)

      a, d.造山前花岗岩;b, e.造山期花岗岩;c, f.造山后花岗岩

      Fig.  4.  Chondrite-normalized REE patterns(a-c) and primitive mantle normalized spider diagram(d-f)of pre-, syn-, and post-orogenic granitoids

      图  5  造山前(a)和造山后(b)花岗岩Sm-Nd全岩等时线

      Fig.  5.  The Sm-Nd whole rock isochrons of pre-orogen(a) and post-orogen(b) granitoids

      图  6  各期花岗岩(Na2O+K2O)-104×Ga/Al(据Whalen et al., 1987)、Y-SiO2(据Collins et al., 1982)、Nb-Y-3Ga(据Eby, 1992)和Rb/Ba-Rb/Sr(据Sylvester, 1998)判别图

      Fig.  6.  (Na2O+K2O)-104×Ga/Al、Y-SiO2、Nb-Y-3Ga and Rb/Ba-Rb/Sr discrimination diagrams of granitoids

      图  7  花岗岩构造环境判别图解(据Pearce et al., 1984; Pearce, 1996)

      syn-COLG.同碰撞花岗岩;VAG.火山弧花岗岩;WPG.板内花岗岩;ORG.洋脊花岗岩

      Fig.  7.  Tectonic environment discrimination of granitoids

      图  8  花岗岩构造环境R1-R2判别(据Batchelor and Bowden, 1985)

      ①地幔分异;②碰撞前;③碰后抬升;④晚造山;⑤非造山;⑥同碰撞;⑦后造山

      Fig.  8.  R1-R2 multi-cation diagram for tectonic environment discrimination of granitoids

      表  1  花岗岩主量元素(10-2)、稀土微量元素(10-6) 分析结果

      Table  1.   Major (10-2), REE and other element (10-6) contents of granitoids

      岩性样号 造山前花岗岩 造山期花岗岩 造山后花岗岩
      QA042 QA044 QA045 QA046 QA047 QA051 QA037 QA038 QA039 QA040 QA041 BB318 BB319 BB320 BB321 BB322
      SiO2 71.63 72.11 71.61 71.56 69.65 76.41 61.83 64.73 65.28 66.00 64.20 75.45 74.91 74.66 73.13 72.98
      TiO2 0.23 0.23 0.22 0.22 0.24 0.14 0.51 0.49 0.49 0.46 0.49 0.04 0.02 0.08 0.09 0.10
      Al2O3 13.05 13.46 13.16 13.71 13.75 12.12 15.07 14.88 14.78 14.75 14.91 13.63 14.20 12.72 14.12 13.96
      Tfe 4.23 4.09 3.70 3.85 3.94 2.75 4.41 4.29 4.06 3.28 3.84 1.06 0.89 1.56 1.69 1.87
      MnO 0.24 0.21 0.15 0.11 0.12 0.12 0.13 0.15 0.16 0.08 0.10 0.06 0.05 0.07 0.08 0.10
      MgO 0.79 0.71 0.75 0.88 0.97 0.39 3.28 3.10 2.44 2.34 2.82 0.14 0.14 0.33 0.28 0.26
      CaO 2.86 3.23 2.71 2.95 3.17 1.14 3.70 3.14 2.84 2.58 3.42 0.40 0.26 0.87 1.05 0.98
      Na2O 3.92 3.88 3.17 3.44 3.64 4.24 3.97 3.86 3.77 3.78 3.46 4.73 4.94 3.81 4.50 3.93
      K2O 0.64 0.83 1.31 1.09 1.26 1.09 3.56 3.82 4.12 4.17 3.15 3.93 3.95 3.78 3.59 4.67
      P2O5 0.041 0.049 0.035 0.046 0.048 0.008 0.301 0.187 0.172 0.176 0.198 0.001 0.001 0.010 0.020 0.013
      LOI 0.98 0.96 1.33 0.92 1.65 0.97 1.27 1.23 1.77 1.29 1.78 0.63 0.66 0.97 0.92 0.93
      Total 98.69 99.84 98.29 98.91 98.58 99.46 98.30 100.15 100.15 99.13 98.62 100.10 100.05 98.88 99.49 99.83
      分异指数DI 76.56 75.89 77.23 75.93 75.05 87.50 70.00 72.75 75.67 77.66 70.56 95.40 95.87 91.87 90.86 91.31
      A/NK 1.82 1.85 1.99 2.00 1.87 1.49 1.45 1.42 1.38 1.37 1.64 1.13 1.14 1.23 1.25 1.21
      A/CNK 1.06 1.02 1.14 1.12 1.05 1.18 0.88 0.92 0.93 0.96 0.97 1.07 1.10 1.06 1.07 1.05
      Rb 13.90 15.90 24.40 24.10 24.90 24.50 103.00 117.50 124.50 129.50 91.90 316.00 325.00 235.00 256.00 298.00
      Ba 584.0 681.0 1 105.0 1 100.0 1 175.0 670.0 1 355.0 1 340.0 1 340.0 1 345.0 1 445.0 24.8 14.9 186.5 174.0 307.0
      Th 2.30 2.11 1.87 2.15 2.08 1.74 8.75 11.90 10.00 13.05 6.97 14.35 29.00 19.65 31.90 29.30
      U 1.44 1.27 1.14 1.20 1.15 0.65 3.20 3.13 4.46 4.54 5.11 7.28 16.15 9.37 12.50 12.90
      Ta 0.20 0.10 0.20 0.10 0.10 0.20 0.80 0.80 0.50 0.60 0.60 14.20 12.30 3.30 5.30 5.60
      Nb 4.00 2.80 3.20 2.70 2.80 3.80 8.70 8.80 8.50 8.40 5.50 35.60 76.10 32.00 51.00 50.70
      Pb 23.00 67.00 43.00 5.00 7.00 5.00 40.00 76.00 43.00 25.00 18.00 48.00 56.00 34.00 36.00 41.00
      Sr 262.0 238.0 292.0 264.0 245.0 137.0 1 290.0 1 195.0 1 025.0 923.0 1 075.0 20.2 8.3 98.2 116.0 118.5
      Zr 229 61 65 70 70 111 171 182 206 252 185 39 157 76 121 117
      Hf 5.80 2.00 2.00 2.10 2.20 3.50 5.40 5.70 6.50 6.90 4.90 4.80 14.60 3.90 6.40 6.20
      La 10.90 11.50 8.20 15.00 10.80 5.80 35.60 31.40 33.20 19.90 25.80 8.30 4.20 14.20 19.80 17.50
      Ce 90.40 21.60 17.10 29.40 20.70 13.90 71.60 62.90 65.40 45.10 53.50 6.20 23.80 30.50 44.90 40.30
      Pr 2.85 3.10 2.19 4.03 2.87 2.23 7.72 6.67 6.79 5.81 6.58 3.13 1.46 3.61 5.35 4.72
      Nd 12.60 13.50 9.90 17.30 12.80 11.20 31.10 26.90 26.50 21.70 25.90 17.60 7.30 15.90 23.40 20.90
      Sm 3.32 3.44 2.68 4.24 3.49 3.52 5.76 4.87 4.70 3.89 5.10 9.92 4.26 5.48 8.22 7.48
      Eu 0.71 0.76 0.72 0.81 0.74 0.76 1.21 1.04 0.92 0.84 1.26 0.22 0.05 0.29 0.35 0.36
      Gd 3.64 3.59 3.02 4.22 3.79 3.94 3.80 3.15 3.10 2.67 3.74 11.40 4.94 6.41 10.00 9.88
      Tb 0.61 0.59 0.50 0.70 0.59 0.72 0.47 0.38 0.37 0.33 0.52 2.08 1.46 1.33 2.07 2.10
      Dy 4.19 3.95 3.52 4.51 4.09 5.23 2.48 2.13 2.00 1.70 3.10 12.95 12.85 9.48 14.85 15.15
      Ho 0.95 0.89 0.78 1.02 0.95 1.27 0.45 0.40 0.35 0.33 0.63 2.54 3.15 2.10 3.27 3.42
      Er 3.11 2.78 2.49 3.17 2.97 4.36 1.21 1.12 0.99 0.86 1.86 8.75 13.15 7.09 11.10 11.75
      Tm 0.48 0.45 0.40 0.49 0.47 0.71 0.17 0.14 0.14 0.13 0.31 1.59 2.73 1.17 1.83 1.90
      Yb 3.39 3.05 2.72 3.41 3.29 5.04 1.11 1.04 0.90 0.91 2.17 13.00 23.40 8.46 13.10 13.60
      Lu 0.59 0.50 0.45 0.57 0.56 0.84 0.16 0.15 0.14 0.15 0.36 2.02 3.75 1.26 2.01 2.08
      Y 28.40 25.60 22.40 29.40 27.40 35.50 13.70 12.50 11.00 9.80 18.70 77.60 67.00 77.30 120.50 130.50
      ∑REE 166.14 95.30 77.07 118.27 95.51 95.02 176.54 154.79 156.50 114.12 149.53 177.30 173.50 184.58 280.75 281.64
      LR/HR 7.12 3.41 2.94 3.91 3.08 1.69 15.53 15.72 17.21 13.73 9.31 0.84 0.63 1.88 1.75 1.52
      δEu 0.69 0.72 0.85 0.64 0.68 0.69 0.81 0.83 0.75 0.82 0.92 0.07 0.04 0.17 0.13 0.14
      Sm/Nd 0.26 0.25 0.27 0.25 0.27 0.31 0.19 0.18 0.18 0.18 0.20 0.56 0.58 0.34 0.35 0.36
      Nb/Ta 63.00 135.00 49.50 173.00 128.00 56.00 38.88 33.63 53.00 36.17 43.17 1.24 0.59 4.82 4.42 3.73
      (La/Yb)N 1.91 2.24 1.79 2.61 1.95 0.68 19.04 17.93 21.90 12.98 7.06 0.38 0.11 1.00 0.90 0.76
      注: A/NK=Al2O3/(Na2O+K2O), 分子比;A/CNK=Al2O3/(CaO+Na2O+K2O), 分子比;DI=Qz+Or+Ab+Ne+Kp;稀土元素球粒陨石标准化值据Herman(1971).
      下载: 导出CSV

      表  2  造山前和造山后花岗岩Sm-Nd同位素分析结果及特征比值

      Table  2.   Sm-Nd isotopic analysis and characteristic ratios of of pre-orogen and post-orogen granitoids

      样号 Sm(10-6) Nd(10-6) 147Sm/144Nd 143Nd/144Nd±1σ εNd(0) fSm/Nd
      造山前花岗岩
      QA042 2.756 10.930 0.152 5 0.512 660±0.000 005 0.43 -0.22
      QA044 2.882 11.950 0.146 0 0.512 632±0.000 003 -0.12 -0.26
      QA045 2.460 9.463 0.157 3 0.512 691±0.000 006 1.03 -0.20
      QA046 3.694 15.710 0.142 3 0.512 613±0.000 004 -0.49 -0.28
      QA047 2.909 11.420 0.154 0 0.512 673±0.000 005 0.68 -0.22
      QA051 2.965 9.815 0.182 7 0.512 830±0.000 006 3.75 -0.07
      造山后花岗岩
      BB319 3.825 7.102 0.325 9 0.513 301±0.000 008 12.93 0.66
      BB320 4.465 15.930 0.169 6 0.512 766±0.000 005 2.50 -0.14
      BB321 6.122 21.640 0.171 2 0.512 775±0.000 004 2.67 -0.13
      BB322 5.992 21.720 0.166 9 0.512 767±0.000 006 2.52 -0.15
      下载: 导出CSV
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    • 收稿日期:  2013-07-23
    • 刊出日期:  2014-01-01

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