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    赣东北蛇绿混杂岩岩石地球化学特征及构造意义

    周文婷 郭国林 刘晓东 伍俊杰 林杰 付锋

    周文婷, 郭国林, 刘晓东, 伍俊杰, 林杰, 付锋, 2016. 赣东北蛇绿混杂岩岩石地球化学特征及构造意义. 地球科学, 41(1): 84-96. doi: 10.3799/dqkx.2016.006
    引用本文: 周文婷, 郭国林, 刘晓东, 伍俊杰, 林杰, 付锋, 2016. 赣东北蛇绿混杂岩岩石地球化学特征及构造意义. 地球科学, 41(1): 84-96. doi: 10.3799/dqkx.2016.006
    Zhou Wenting, Guo Guolin, Liu Xiaodong, Wu Junjie, Fu Feng, Lin Jie, 2016. Geochemical Characteristics and Tectonic Significances of the Rocks from Northeastern Jiangxi Ophiolite. Earth Science, 41(1): 84-96. doi: 10.3799/dqkx.2016.006
    Citation: Zhou Wenting, Guo Guolin, Liu Xiaodong, Wu Junjie, Fu Feng, Lin Jie, 2016. Geochemical Characteristics and Tectonic Significances of the Rocks from Northeastern Jiangxi Ophiolite. Earth Science, 41(1): 84-96. doi: 10.3799/dqkx.2016.006

    赣东北蛇绿混杂岩岩石地球化学特征及构造意义

    doi: 10.3799/dqkx.2016.006
    基金项目: 

    ;东华理工大学放射性地质与勘探技术国防重点学科实验室开放基金项目 REGT1206

    国家自然科学基金项目 41262002

    详细信息
      作者简介:

      周文婷(1990-),女,硕士,地质学专业.E-mail: zhouwenting0609@163.com

      通讯作者:

      郭国林, E-mail: gglrobin@163.com

    • 中图分类号: P581

    Geochemical Characteristics and Tectonic Significances of the Rocks from Northeastern Jiangxi Ophiolite

    • 摘要: 赣东北蛇绿混杂岩是中国为数不多的新元古代蛇绿岩,对该蛇绿混杂岩带中的方辉橄榄岩和玄武岩类岩石进行元素地球化学研究,以探讨新元古代赣东北地区的构造动力学背景.研究表明,方辉橄榄岩具有低TiO2(0.02%~0.37%)、低K2O(0~0.02%)、低Na2O(0.02%~0.10%)和富MgO(40.81%~44.58%)特征,烧失量普遍较高(10.09%~13.47%),表明样品普遍遭受蚀变;稀土元素配分模式图和微量元素蛛网图显示,橄榄岩样品具有亏损地幔源区特征,同时兼有俯冲带流体交代的特征.玄武岩类SiO2含量主要为52.63%~56.19%,平均为55.00%,属安山玄武岩范围.岩石具低MgO(3.66%~6.46%),中等TiO2(1.14%~2.66%),高Al2O3(13.07%~15.27%)、Na2O(3.42%~5.03%)的特征.安山玄武岩轻稀土富集((La/Yb)N=1.84~2.61),无明显Eu异常,稀土配分曲线呈右倾型;微量元素蛛网图中显示大离子亲石元素Th、Ba、U、Pb富集、高场强元素Nb、Ti亏损,可能系俯冲板片脱水产生的流体交代地幔楔所形成,TNT(Ta、Nb和Ti)的负异常指示赣东北蛇绿混杂岩的形成过程中可能遭受了陆源物质的混染,反映了消减作用的影响.方辉橄榄岩和安山玄武岩的地球化学特征表明赣东北蛇绿混杂岩的形成可能经历了多期演化,早期可能系古华南洋发生洋内俯冲作用,俯冲过程中释放的流体交代了俯冲带上的地幔楔,使地幔橄榄岩富集轻稀土.随后的弧后盆地扩张阶段,形成具有岛弧性质和MORB特征的玄武岩类,但由于弧后盆地发育不成熟,玄武岩类在地球化学上显示有大陆物质的特征,表现出高Pb、低Ti和轻稀土强烈富集.

       

    • 图  1  赣东北蛇绿混杂岩地质简图

      底图据Li et al.(2003)

      Fig.  1.  Geological sketch map of the Northeast Jiangxi ophiolite

      图  2  赣东北蛇绿混杂岩中方辉橄榄岩和玄武岩类样品照片

      a.玄武岩呈透镜体状穿插于地幔橄榄岩中,长轴走向与构造方向一致;b.方辉橄榄岩风化面为灰黑色,新鲜面为灰绿色;c.玄武岩风化面为灰褐色,新鲜面为灰黑色;d.方辉橄榄岩,橄榄石和斜方辉石呈碎裂结构,蛇纹石沿裂隙发育,见尖晶石发育(正交偏光)(13XW003);e.辉绿岩,蚀变强烈,见斜长石、角闪石、绿泥石等矿物(正交偏光)(13SZS001);f.方辉橄榄岩,橄榄石和斜方辉石呈碎裂结构,蛇纹石沿裂隙发育(单偏光)(13Y055);g.方辉橄榄岩,蛇纹石化强烈(单偏光)(13Y017);Spl.尖晶石;Srp.蛇纹石;Ol.橄榄石;Opx.斜方辉石;Pl.斜长石;Hbl.角闪石;Chl.绿泥石

      Fig.  2.  Photos of the harzburgite and basalts from the Northeast Jiangxi ophiolite melange zone

      图  3  赣东北蛇绿混杂岩中方辉橄榄岩的Al2O3-CaO-MgO和FAM图

      底图引自Coleamn(1977)

      Fig.  3.  Al2O3-CaO-MgO and FAM diagrams of the harzburgite from the Northeast Jiangxi ophiolite

      图  4  赣东北蛇绿混杂岩中方辉橄榄岩元素对MgO图

      原始地幔数据McDonough and Sun(1995)

      Fig.  4.  Diagrams of oxides vs. MgO of the harzburgite from the Northeast Jiangxi ophiolite

      图  5  赣东北蛇绿混杂岩中方辉橄榄岩稀土元素球粒陨石标准化配分图解和微量元素原始地幔标准化蛛网图

      标准值据Sun and McDonough(1989)

      Fig.  5.  Primitive-mantle normalized spidergram, chondrite-normalized REE patterns for the harzburgite from the Northeast Jiangxi ophiolite melange zone

      图  6  鉴别赣东北蛇绿混杂岩中玄武岩岩石分类的TAS(a)和Zr/Ti-Nb/Y图(b)

      a.底图据Le Maitre, (2002);b.底图据Pearce(1996)

      Fig.  6.  Plots of TASand Zr/Ti-Nb/Y for the basalts from the Northeast Jiangxi ophiolite

      图  7  赣东北蛇绿混杂岩中安山玄武岩稀土元素球粒陨石标准化配分图解和微量元素原始地幔标准化蛛网图

      标准值据Sun and McDonough(1989)

      Fig.  7.  Primitive-mantle normalized spidergram, chondrite-normalized REE patterns for the andesitic basalts from the Northeast Jiangxi ophiolite

      图  8  赣东北蛇绿混杂岩中安山玄武岩构造环境判别

      a.Ti/100-Zr-3Y图解(底图引自Pearce et al., 1973):A.岛弧拉斑玄武岩,B.岛弧拉斑玄武岩、钙碱性玄武岩和MORB,C.钙碱性玄武岩,D.板内玄武岩;b.2Nb-Zr/4-Y图解(底图引自Meschede, 1986):A1.板内碱性玄武岩,A2.板内碱性玄武岩和板内拉斑玄武岩,B.E-MORB,C.板内拉斑玄武岩和火山弧玄武岩,D.N-MORB和火山弧玄武岩:c.TiO2-MnO×10-P2O5×10图解(底图引自Mullen,1983):MORB.洋中脊玄武岩,OIT.洋岛拉斑玄武岩或海山拉斑玄武岩,OIA.洋岛碱性玄武岩和海山碱性玄武岩,CAB.岛弧钙碱性玄武岩,IAT.岛弧拉斑玄武岩

      Fig.  8.  Tectonic discrimination diagrams of the andesitic basalts from the northeast Jiangxi ophiolite melange zone

      图  9  赣东北蛇绿混杂岩中安山玄武岩Ta/Yb-Th/Yb构造环境判别

      底图据Pearce(1983)

      Fig.  9.  Trace element compostion Ta/Yb-Th /Yb for the tectonic setting discrimination for the andesitic basalt rocks from the northeast Jiangxi ophiolite melange zone

      图  10  赣东北蛇绿混杂岩中安山玄武岩构造判别

      图a引自Pearce and Norry(1979);图b汪云亮等(2001)

      Fig.  10.  Trace element discrimination plots of the tectonic setting of the andesitic basalt rocks from the northeast Jiangxi ophiolite melange zone

      表  1  赣东北蛇绿混杂岩中岩石主量元素(%)、微量元素和稀土元素(10-6)含量

      Table  1.   Major(%), trace elements and REE(10-6) compositions of the Northeast Jiangxi ophiolite melange zone

      样品号 13XW003 13Y017 13Y055 13Y071 GDB13 13SZS001 13Y031 13Y034
      岩性 方辉橄榄岩 方辉橄榄岩 方辉橄榄岩 方辉橄榄岩 方辉橄榄岩 玄武岩 玄武岩 玄武岩
      SiO2 44.90 45.72 46.66 46.74 45.27 52.63 56.19 56.19
      Al2O3 1.17 1.44 1.83 1.89 0.63 13.07 15.27 13.62
      TiO2 0.02 0.37 0.03 0.05 0.02 2.66 1.14 1.76
      Fe2O3 6.41 7.43 5.08 5.84 5.92 3.09 4.99 5.41
      FeO 2.77 4.09 3.37 3.23 3.42 11.20 4.60 7.95
      CaO 0.79 0.02 0.96 1.04 0.01 6.59 6.55 6.01
      MgO 43.71 40.81 41.94 41.06 44.58 4.63 6.46 3.66
      K2O 0.01 0.01 0.02 0.02 0.00 0.50 0.17 1.42
      Na2O 0.10 0.02 0.03 0.02 0.02 5.03 4.26 3.42
      MnO 0.12 0.08 0.09 0.12 0.11 0.25 0.23 0.24
      P2O5 0.00 0.00 0.00 0.00 0.00 0.35 0.13 0.31
      H2O+ 10.73 11.55 9.90 10.25 11.24 2.82 2.69 2.38
      H2O- 0.84 0.61 0.75 0.96 0.23 0.34 0.22 0.40
      LOI 11.18 11.82 10.09 10.34 13.47 3.43 3.88 2.69
      TOL 99.52 99.52 99.49 99.53 99.53 99.84 99.83 99.84
      Mg# 93.30 90.81 93.04 92.65 92.95 39.84 62.95 38.82
      Y 0.85 14.79 2.08 2.10 1.97 43.89 24.53 35.49
      La 0.24 4.92 0.46 0.38 0.18 11.83 7.86 13.49
      Ce 0.69 3.43 1.01 0.99 0.53 30.66 17.95 30.47
      Pr 0.06 1.57 0.08 0.11 0.06 4.67 2.53 4.40
      Nd 0.23 6.30 0.32 0.42 0.31 22.32 11.44 20.44
      Sm 0.04 1.59 0.07 0.11 0.10 6.42 3.11 5.02
      Eu 0.02 0.27 0.02 0.06 0.03 2.28 1.03 1.78
      Gd 0.05 1.87 0.10 0.15 0.09 6.74 3.39 5.40
      Tb 0.01 0.41 0.02 0.03 0.02 1.40 0.73 1.14
      Dy 0.07 2.45 0.26 0.22 0.16 8.76 4.76 6.86
      Ho 0.02 0.54 0.03 0.05 0.04 1.81 0.95 1.38
      Er 0.06 1.50 0.11 0.17 0.13 4.89 2.75 3.93
      Tm 0.01 0.26 0.02 0.03 0.03 0.87 0.49 0.70
      Yb 0.11 1.26 0.18 0.21 0.26 4.62 2.68 3.70
      Lu 0.02 0.19 0.02 0.03 0.03 0.77 0.42 0.63
      ΣREE 1.60 26.55 2.71 2.94 1.95 108.03 60.09 99.34
      δEu 1.21 0.47 0.85 1.41 0.99 1.05 0.96 1.04
      (La/Yb)N 1.61 2.79 1.81 1.29 0.50 1.84 2.11 2.61
      Li 1.02 3.34 7.73 7.89 0.82 8.16 5.14 6.01
      Be 0.04 0.06 0.04 0.02 0.03 0.98 0.54 0.79
      Sc 8.11 14.77 11.05 10.35 6.00 35.44 30.43 34.09
      V 39.6 36.8 59.1 55.4 34.4 378.4 249.6 326.2
      Cr 2 490 2 016 2 808 2 338 2 517 24.0 51.5 16.4
      Co 95.6 81.8 93.3 106.2 93.7 34.2 34.1 36.6
      Ni 1 812 2 296 1 861 1 915 1 803 20.6 29.0 13.0
      Cu 6.3 4.9 7.3 11.1 11.6 39.1 145.8 43.9
      Zn 31.9 29.5 29.9 35.9 38.2 119.3 422.1 93.9
      Ga 0.60 2.91 1.01 1.84 0.65 18.69 12.36 16.45
      Rb 0.6 1.2 1.6 1.4 0.6 17.6 3.2 24.4
      Sr 8.3 5.5 10.4 13.0 4.8 198.3 125.4 206.9
      Zr 7.5 24.1 7.7 5.9 17.8 180.4 99.1 138.2
      Nb 0.18 1.08 0.25 0.28 0.78 6.62 2.20 4.62
      Mo 0.91 0.08 0.19 0.08 0.03 0.45 0.21 0.42
      In 0.01 0.01 0.01 0.01 0.01 0.09 0.08 0.07
      Sb 0.91 0.62 0.16 0.21 0.65 0.35 0.96 0.67
      Cs 0.25 0.47 1.85 2.95 0.31 22.87 0.21 2.84
      Ba 8.3 10.2 8.7 30.5 5.1 261.7 100.5 383.9
      Hf 0.22 0.70 0.18 0.12 0.50 5.22 3.11 4.13
      Ta 0.04 0.11 0.15 0.07 0.03 0.43 0.20 0.40
      W 24.30 0.24 0.31 0.16 0.09 0.41 0.25 0.33
      Tl 0.12 0.02 0.04 0.18 0.02 0.18 0.03 0.17
      Pb 1.58 1.39 2.60 1.75 1.36 6.98 6.83 6.32
      Bi 0.02 0.02 0.02 0.01 0.02 0.03 0.28 0.06
      Th 0.12 0.29 0.10 0.11 0.03 1.63 1.33 2.04
      U 0.09 0.12 0.09 0.10 0.09 0.35 0.42 0.50
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