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    东昆仑马尼特地区片麻状花岗闪长岩锆石U-Pb年代学、地球化学及其构造背景

    赵菲菲 孙丰月 刘金龙

    赵菲菲, 孙丰月, 刘金龙, 2017. 东昆仑马尼特地区片麻状花岗闪长岩锆石U-Pb年代学、地球化学及其构造背景. 地球科学, 42(6): 927-940. doi: 10.3799/dqkx.2017.073
    引用本文: 赵菲菲, 孙丰月, 刘金龙, 2017. 东昆仑马尼特地区片麻状花岗闪长岩锆石U-Pb年代学、地球化学及其构造背景. 地球科学, 42(6): 927-940. doi: 10.3799/dqkx.2017.073
    Zhao Feifei, Sun Fengyue, Liu Jinlong, 2017. Zircon U-Pb Geochronology and Geochemistry of the Gneissic Granodiorite in Manite Area from East Kunlun, with Implications for Geodynamic Setting. Earth Science, 42(6): 927-940. doi: 10.3799/dqkx.2017.073
    Citation: Zhao Feifei, Sun Fengyue, Liu Jinlong, 2017. Zircon U-Pb Geochronology and Geochemistry of the Gneissic Granodiorite in Manite Area from East Kunlun, with Implications for Geodynamic Setting. Earth Science, 42(6): 927-940. doi: 10.3799/dqkx.2017.073

    东昆仑马尼特地区片麻状花岗闪长岩锆石U-Pb年代学、地球化学及其构造背景

    doi: 10.3799/dqkx.2017.073
    基金项目: 

    中国地质调查局地质大调查项目 12120111086020

    详细信息
      作者简介:

      赵菲菲(1982-),男,博士研究生,主要从事矿床学研究.ORCID:0000-0003-4133-6718.E-mail:terry__xp@163.com

      通讯作者:

      孙丰月,E-mail:sfy@jlu.edu.cn

    • 中图分类号: P581

    Zircon U-Pb Geochronology and Geochemistry of the Gneissic Granodiorite in Manite Area from East Kunlun, with Implications for Geodynamic Setting

    • 摘要: 为确定东昆仑马尼特地区片麻状花岗闪长岩的形成时代、源区性质和构造背景,对其进行了锆石U-Pb年代学、地球化学和锆石Hf同位素研究.本次测试的片麻状花岗闪长岩锆石LA-ICP-MS(laser ablation inductively coupled plasma mass spectrometry) U-Pb加权平均年龄为495.6±1.1 Ma(MSWD=0.13),属于晚寒武世.马尼特片麻状花岗闪长岩SiO2含量为61.47%~63.99%,Na2O、K2O和CaO含量分别为2.91%~3.64%、0.93%~2.31%和4.29%~6.52%,全碱ALK=3.92%~5.69%,铝饱和指数A/CNK=0.83~0.97,属准铝质钙碱性系列岩石.岩石具有富集大离子亲石元素(Rb、K)和不相容元素(Th、U),相对亏损Nb、Ta、Zr、Ti高场强元素的特征,Nb/Ta、La/Nb、Th/Nb、Th/La等比值显示出岩石具有壳源特征.岩石具有高的εHf(t)值(12.2~15.0),Hf两阶段模式年龄在506~662 Ma范围内,其岩浆源区初始物质主要来源于新生地壳.岩石在微量元素Rb-(Y+Nb)构造判别图落入火山弧花岗岩区域,在R1-R2构造判别图落入板块碰撞前消减区花岗岩区域.结合岩石成岩年龄、地球化学特征以及区域构造演化,推测其应形成于原特提斯洋俯冲的构造环境,属于大洋洋壳向南俯冲的产物,即柴达木地块和万宝沟大洋玄武岩高原之间的洋壳同时向南、北发生双向俯冲消减.

       

    • 东昆仑造山带位于柴达木盆地南缘,隶属于中国大陆中央造山带西段(姜春发等,1992殷鸿福和张克信,1997姜春发等,2000).大量的研究表明东昆仑造山带是个多期-多旋回的复合造山带(罗照华等,1999莫宣学等,2007),岩浆活动始于元古宙,止于新生代,不同时期的岩石组合记录了东昆仑多旋回边缘造山演化历史.马尼特地区位于都兰县洪水川南侧,布青山山脉中段主脊一带(97°38′00″~97°40′00″E;35°28′00″~35°29′00″N).前人从不同角度对本区大地构造背景及动力学演化做了大量研究,并认为本区存在早古生代和晚古生代两期洋-陆相互转化的构造演化过程(边千韬等,1999裴先治,2001李王晔等,2007刘战庆等,2011李瑞保等,2015刘金龙等,2015).但上述研究主要集中在晚古生代古特提斯洋演化,而对于本区更早阶段原特提斯洋的演化过程研究目前较为薄弱.孙雨(2010)通过对得力斯坦蛇绿岩(516 Ma)研究认为,该蛇绿岩代表了早古生代原特提斯洋洋壳残余体;

      东昆仑造山带是中国中央造山带的重要组成部分之一.前人根据不同的构造演化观点,对东昆仑造山带提出了不同的划分方案(古凤宝,1994许志琴等,1996姜春发等,2000).孙丰月等(2003)以昆北、昆中、昆南和阿尼玛卿南缘4条断裂为界,将东昆仑造山带由北向南依次划为昆北加里东弧后裂陷带、昆中基底隆起花岗岩带、昆南复合拼贴带、阿尼玛卿蛇绿混杂岩带和北巴颜喀拉造山带.马尼特地区位于阿尼玛卿-布青山脉的北坡,大地构造位置处阿尼玛卿蛇绿混杂岩带内(图 1).

      图  1  马尼特地区地质简图
      1.第四系;2.中二叠世马尔争组板岩、千枚岩;3.中二叠世马尔争组砂岩、砾岩;4.华力西期花岗闪长岩;5.华力西期闪长玢岩脉;6.片麻状花岗闪长岩;7.正断层/逆断层;8.构造蚀变破碎带;9.研究区位置;10.岩体位置及取样位置;据青海省第三地质矿产勘查院,2013.青海省都兰县马尼特地区金矿普查2012年工作总结及2013年工作安排.青海
      Fig.  1.  The sketch geological map of the Manite area

      马尼特地区出露的地层较为单一,主要为一套浅海相碎屑岩沉积,属中二叠世布青山群马尔争组,其次为第四纪冰碛及冲、洪积砂砾石层.其中二叠世布青山群马尔争组下岩段地层是本区的主体地层,总体呈NW-SE向展布,与区域构造线方向一致,倾向向北或向南,其主要岩石类型为砂质板岩、绢云母板岩和绢云母千枚状板岩.区内断裂构造发育,以NW向为主,其次为NE向断裂构造.NW向断裂构造主要出露有F1、F2,NE向以F7为代表.区内岩浆活动强烈,以华力西期中酸性侵入岩为主,岩性较为单一,主要为花岗闪长岩及其派生的闪长玢岩脉,花岗闪长岩主要呈岩株状或宽脉状产出,在中北部大面积出露,呈灰-深灰色,微细粒状结构,块状构造.闪长玢岩多以小岩脉形式产出,呈NW-SE向展布,与构造展布方向基本一致,呈土黄色-灰绿色-青灰色-浅灰色,变余斑状-斑状结构,块状构造.

      本次研究的片麻状花岗闪长岩在马尼特地区东南部出露,蚀变比较强烈,呈深灰色,细粒结构,片麻状构造.LA-ICP-MS(laser ablation inductively coupled plasma mass spectrometry)锆石U-Pb测年获得片麻状花岗闪长岩年龄为495.6±1.1 Ma,考虑到片麻状花岗闪长岩和围岩的地质时代,推测其与围岩为断层接触关系,应为阿尼玛卿构造带中的构造岩片.

      本次测试的片麻状花岗闪长岩(35°28′11″N,97°39′39″E)为灰-深灰色,具有细粒结构和片麻状构造.显微镜下(图 2)显示组成岩石主要的矿物为斜长石(40%~45%)、角闪石(20%~25%)、石英(20%~25%)和碱性长石(10%~15%).斜长石呈板柱状,粒度0.3~0.6 mm,表面因蚀变而模糊,局部可见聚片双晶;角闪石主要呈长柱状,粒度为0.4~2.0 mm,正中突起,多色性明显,呈蓝绿色-绿色,可见闪石式解理;石英呈他形粒状,粒度0.05~3.20 mm,表面干净,一级灰-白干涉色,有轻微的波状消光现象;碱性长石呈板状,粒度为0.20~0.35 mm,表面因蚀变而模糊.镜下命名为片麻状细粒花岗闪长岩.

      图  2  马尼特片麻状花岗闪长岩显微照片
      a.片麻状花岗闪长岩中定向的角闪石(单偏光);b.片麻状花岗闪长岩中角闪石的简单双晶及闪石式解理、石英、斜长石的聚片双晶(正交偏光).矿物代号缩写:Qtz.石英,Pl.斜长石,Hbl.角闪石,Al.碱性长石
      Fig.  2.  The micrographs of the Manite gneissic granodiorite

      锆石的挑选由河北省廊坊区域地质调查研究所实验室利用标准重矿物分离技术分选完成.经过双目镜下仔细挑选,将不同特征的锆石粘在双面胶上,并用无色透明的环氧树脂固定;待其固化之后,将表面抛光至锆石的中心.在测试前,通过反射光和阴极发光(cathodolominescence,CL)图像仔细研究锆石的晶体形态与内部结构特征,以选择最佳测试点.锆石制靶、反射光、阴极发光以及锆石U-Pb年龄测定和微量元素分析均在中国地质大学(武汉)地质过程与矿产资源国家重点实验室利用LA-ICP-MS同时分析完成.本次测试采用的激光剥蚀束斑直径为32 μm,激光剥蚀样品的深度为20~40 μm;实验中采用He作为剥蚀物质的载气.锆石年龄采用国际标准锆石91500作为外标,元素含量采用NIST SRM610作为外标,29Si作为内标元素,锆石中SiO2的质量百分含量为32.8%(袁洪林等,2003);普通铅校正采用Anderson(2002)推荐的方法(Andersen,2002);样品的同位素比值及元素含量计算采用ICP-MS-DATECAL程序(Liu et al., 2008, 2010),年龄计算及谐和图的绘制采用Isoplot(ver3.0) 程序(Ludwig,2003).

      锆石Lu-Hf同位素测定在中国地质大学(武汉)地质过程与矿产资源国家重点实验室利用激光剥蚀多接收杯等离子体质谱(laser ablation multi-receiver inductively coupled plasma mass spectrometry,LA-MC-ICP-MS)完成.激光剥蚀系统为GeoLas 2005 (Lambda Physik,德国),多接收器等离子质谱仪(multi-receiver inductively coupled plasma mass spectrometry,MC-ICP-MS)为Neptune Plus(Thermo Fisher Scientific,德国).实验过程中采用He作为剥蚀物质的载气,单点剥蚀模式,斑束固定为44 μm.详细仪器操作条件和分析方法可参照见侯可军等(2007),分析过程中锆石标准GJ1的176Hf/177Hf测试加权平均值为0.282 011±24(2SDn=13),与文献(Elhlou et al., 2006; 侯可军等,2007)报道的值在误差范围内完全一致.

      样品的主量、微量和稀土元素测试均由广州澳实矿物实验室中心完成.首先将待测样品在65 ℃左右低温干燥24 h,之后破碎,经多次手工缩分出300 g均匀样品在振动研磨机上研磨至200目以备分析测试.主量元素由荷兰PANalytical生产的Axios仪器利用熔片X-射线荧光光谱法测定,并采用等离子光谱和化学法测定进行互相检测.微量元素和稀土元素采用美国PerkinElmer公司生产的Elan9000型电感耦合等离子质谱仪(inductively coupled plasma mass spectrometry,ICP-MS)测定.主量元素分析精度和准确度优于5%,微量和稀土元素分析精度和准确度优于10%.

      样品(MNT-N4) 中锆石主要为长柱状,部分呈短柱状,长径约为80~200 μm.CL图像(图 3)显示,样品中大多数锆石的自形程度较好,具有均匀的韵律环带结构,显示其岩浆成因.样品中共有20个有效年龄数据,U和Th含量分别介于183×10-6~751×10-6和57.4×10-6~279.0×10-6,锆石的Th/U比值介于0.26~0.50,均>0.1,为岩浆成因锆石(Belousova et al., 2002Hoskin and Schaltegger, 2003).其中19个锆石分析点比较集中, 均落在谐和线上及其附近,有一个偏离协和线,锆石U-Pb加权平均年龄为495.6±1.1 Ma(MSWD=0.130)(图 4)(测试数据见表 1),属于晚寒武世.

      图  3  马尼特片麻状花岗闪长岩锆石阴极发光图像
      Fig.  3.  Cathodoluminescence images of analyzed zircons of the Manite gneissic granodiorite
      图  4  马尼特片麻状花岗闪长岩锆石U-Pb年龄谐和图
      Fig.  4.  U-Pb concordia ages of the Manite gneissic granodiorite
      表  1  马尼特片麻状花岗闪长岩锆石LA-MC-ICP-MS U-Pb同位素定年数据
      Table  Supplementary Table   LA-MC-ICP-MS zircon U-Pb isotope dating results of the Manite gneissic granodiorite
      测点号 质量百分含量(10-6) Th/U 同位素比率 同位素年龄(Ma)
      PbThU 207Pb/206Pb1σ207Pb/235U1σ206Pb/238U207Pb/206Pb1σ207Pb/235U1σ206Pb/238U1σ
      MNT-N4-143.992.12750.330.056 80.002 00.626 60.021 30.079 50.000 848381494134935
      MNT-N4-288.1196.05150.380.056 70.003 20.633 20.032 50.080 30.001 0480131498204986
      MNT-N4-339.879.92760.290.057 10.001 80.622 90.019 20.079 00.000 849470492124905
      MNT-N4-441.079.53000.270.055 80.001 80.615 60.018 80.080 10.000 744377487124964
      MNT-N4-527.957.41830.310.054 30.002 40.621 00.028 50.082 10.001 038398490185096
      MNT-N4-639.078.32960.260.057 00.001 90.622 70.019 50.079 40.000 950072492124935
      MNT-N4-758.4122.03780.320.056 70.001 50.627 80.019 90.080 00.001 248061495124967
      MNT-N4-870.3151.04240.360.057 00.001 60.630 20.018 40.080 00.000 750060496114964
      MNT-N4-939.073.22720.270.056 90.001 90.626 60.021 00.079 80.000 848774494134955
      MNT-N4-1097.0230.05290.430.056 40.001 60.623 80.018 00.080 10.000 647832492114974
      MNT-N4-1143.798.13150.310.056 90.001 90.631 30.022 40.080 10.001 148777497144977
      MNT-N4-12111.0246.07510.330.056 90.001 40.630 10.016 00.080 00.000 948752496104965
      MNT-N4-1390.0210.05770.360.057 30.001 40.631 20.015 10.079 50.000 65025249794934
      MNT-N4-1465.6156.03360.470.057 10.001 70.631 00.018 90.079 80.000 749467497124954
      MNT-N4-15113.0279.05600.500.056 20.001 60.622 30.016 90.080 10.000 745763491114964
      MNT-N4-1653.7121.03140.390.056 50.002 00.624 40.021 50.080 00.000 947878493134965
      MNT-N4-1742.093.82330.400.057 10.002 30.630 20.024 70.079 70.000 849461496154945
      MNT-N4-1845.5113.02280.490.056 90.002 00.631 20.021 50.080 20.000 848778497134975
      MNT-N4-1959.2121.04350.280.057 30.001 60.630 80.017 50.079 30.000 950261497114925
      MNT-N4-2067.2142.04760.300.056 80.001 60.628 90.018 00.079 60.000 848361495114935
      注:测试单位和测试时间:中国地质大学(武汉)地质过程与矿产资源国家重点实验室,2014.
      下载: 导出CSV 
      | 显示表格

      对上述锆石U-Pb年龄测定的样品进行Lu-Hf同位素测试,测试点尽量选择与U-Pb年龄测定位置相同或相近,结果见表 2.马尼特片麻状花岗闪长岩中锆石的176Lu/177Hf比值为0.000 916~0.002 090,fLu/Hf值为-0.97~-0.94,低于上地壳(176Lu/177Hf=0.009 3,fLu/Hf=-0.72) 的值(Vervoort and Patchett, 1996).锆石的176Hf/177Hf比值为0.282 821~0.282 898,利用206Pb/238U计算获得εHf(t)为12.2~15.0,二阶段Hf模式年龄(tDM2)为506~662 Ma,平均为575 Ma.

      表  2  马尼特片麻状花岗闪长岩锆石Lu-Hf同位素组成
      Table  Supplementary Table   Zircon Lu-Hf isotopic compositions of the Manite gneissic granodiorite
      测点号 176Hf/177Hf 2σ 176Lu/177Hf 2σ 176Yb/177Hf 2σ εHf(0) εHf(t) 2σ tDM1(Ma) tDM2(Ma) fLu/Hf
      MNT-N4-1 0.282 821 0.000 021 0.001 279 0.000 035 0.034 368 0.000 971 1.7 12.2 0.9 615 662 -0.96
      MNT-N4-20.282 8700.000 0260.001 3710.000 0160.035 8800.000 6753.513.91.0547567-0.96
      MNT-N4-30.282 8620.000 0200.001 0150.000 0470.025 6040.001 0543.213.80.9553576-0.97
      MNT-N4-40.282 8890.000 0330.001 1360.000 0210.029 4920.000 5544.214.71.3516524-0.97
      MNT-N4-50.282 8460.000 0340.000 9160.000 0370.024 8770.001 1242.613.21.3574605-0.97
      MNT-N4-60.282 8310.000 0230.000 9170.000 0190.023 1600.000 3162.112.71.0596636-0.97
      MNT-N4-70.282 8850.000 0250.001 1160.000 0260.028 9860.000 7374.014.51.0522533-0.97
      MNT-N4-80.282 8830.000 0250.001 1030.000 0260.028 3730.000 5583.914.51.0524536-0.97
      MNT-N4-90.282 8570.000 0240.001 1260.000 0090.028 8750.000 1583.013.61.0562587-0.97
      MNT-N4-100.282 8440.000 0170.001 7380.000 0390.043 3940.001 1242.512.90.8590625-0.95
      MNT-N4-110.282 8300.000 0250.001 0030.000 0050.025 5020.000 0802.012.61.0598639-0.97
      MNT-N4-120.282 8630.000 0280.001 0460.000 0240.026 5220.000 6983.213.81.1553575-0.97
      MNT-N4-130.282 8980.000 0340.001 0270.000 0500.025 4910.001 3834.415.01.3503506-0.97
      MNT-N4-140.282 8910.000 0280.001 3720.000 0410.038 0840.001 1234.214.71.1517525-0.96
      MNT-N4-15 0.282 898 0.000 037 0.002 090 0.000 049 0.057 525 0.000 655 4.4 14.7 1.4 517 525 -0.94
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      马尼特地区片麻状花岗闪长岩主量元素、微量元素和稀土元素含量及特征值见表 3.其中SiO2含量为61.47%~63.99%,Na2O、K2O和CaO含量分别为2.91%~3.64%、0.93%~2.31%和4.29%~6.52%,全碱ALK=3.92%~5.69%,Al2O3含量为14.64%~15.52%,铝饱和指数A/CNK=0.83~0.97.在图 5a中,样品落入闪长岩和花岗闪长岩区域,属亚碱性系列;在图 5b中,主要落入钙碱性区域;在图 5c中全部落入准铝质区域.主量元素显示岩石具有准铝质、钙碱性特征.

      表  3  马尼特片麻状花岗闪长岩主量元素(%)、稀土元素及微量元素(10-6)分析结果
      Table  Supplementary Table   Major(%), REE and trace (10-6) element compositions of the Manite gneissic granodiorite
      样号MNT-1MNT-2MNT-3MNT-4MNT-5MNT-6MNT-7
      SiO262.6461.6761.8063.2863.1961.4763.99
      TiO20.380.390.380.360.360.390.39
      Al2O315.5214.8414.9914.6414.7914.8115.37
      Fe2O36.397.367.226.566.427.285.96
      MnO0.160.160.150.140.140.150.14
      MgO2.713.603.553.123.403.642.04
      CaO4.676.286.045.875.386.524.29
      Na2O3.642.932.913.353.292.993.38
      K2O1.941.081.161.021.310.932.31
      P2O50.110.090.090.100.100.090.11
      LOI1.741.521.621.491.551.651.94
      Total99.999.9299.9199.9399.9399.9299.92
      K2O/Na2O0.530.370.400.300.400.310.68
      A/CNK0.930.850.880.850.890.830.97
      A/NK1.922.482.482.212.162.501.91
      K2O+Na2O5.584.014.074.374.603.925.69
      V140162161148143172123
      Cr31.062.157.450.965.062.613.5
      Cs1.0800.7960.8390.7571.0800.7261.20
      Ga11.509.9410.009.4910.509.869.97
      Hf1.271.221.241.261.391.091.15
      Rb73.924.529.227.842.420.477.6
      Sr268269282269292259234
      Zr32.525.732.328.635.624.030.3
      Nb3.372.632.853.133.632.732.93
      Ba598426464299385292626
      Ta0.320.270.250.290.300.260.27
      Th7.843.263.544.265.393.265.64
      U1.431.511.481.51.441.481.22
      Y13.611.911.711.112.11210.3
      La21.711.810.914.015.011.414.2
      Ce36.921.121.124.427.520.624.9
      Pr4.032.452.402.783.112.382.77
      Nd14.709.649.5110.5011.909.6910.10
      Sm2.832.022.132.062.512.061.96
      Eu0.770.580.530.530.640.590.61
      Gd2.912.092.192.282.782.101.85
      Tb0.470.400.350.420.410.340.32
      Dy2.472.092.091.952.262.161.75
      Ho0.520.440.440.400.460.430.36
      Er1.621.401.431.311.441.391.12
      Tm0.260.220.230.230.230.220.20
      Yb1.811.531.451.511.641.501.29
      Lu0.290.240.230.230.250.230.22
      δEu0.820.850.740.750.730.850.97
      ΣREE91.2755.9954.9862.6070.1355.0961.64
      LREE80.9347.5946.5754.2760.6546.7254.54
      HREE10.348.408.428.339.478.377.10
      LREE/HREE7.835.675.536.526.405.587.68
      (La/Yb)N8.085.205.076.256.175.127.42
      Rb/Sr0.280.090.100.100.150.080.33
      Rb/Nb21.939.3210.258.8811.687.4726.48
      Nb/Ta10.609.8511.2610.9812.1410.7110.89
      La/Nb6.444.493.824.474.134.184.85
      Th/Nb2.331.241.241.361.481.191.92
      Th/La0.360.280.320.300.360.290.40
      注:LOI.烧失量;A/CNK=Al2O3/(CaO+Na2O+K2O)摩尔比;δEu=2×(Eu/0.0735)/(Gd/0.259+Sm/0.195);LREE=La+Ce+Pr+Nd+Sm+Eu;HREE=Gd+Tb+Dy+Ho+Er+Tm+Yb+Lu;(La/Yb)N=(La/0.310)/(Yb/0.209).
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      图  5  马尼特片麻状花岗闪长岩TAS、SiO2-K2O和A/CNK-A/NK
      Fig.  5.  Total alkali versus SiO2, SiO2 versus K2O and A/CNK versus A/NK diagrams for the Manite gneissic granodiorite

      片麻状花岗闪长岩的稀土总量较低,∑REE为54.98×10-6~91.27×10-6,不同样品具有相近的稀土元素配分曲线(图 6a),表明岩浆源区相同.配分曲线呈轻稀土元素弱富集的右倾式,岩石LREE为46.57×10-6~80.93×10-6,HREE为7.10×10-6~10.34×10-6,轻重稀土元素分馏较弱(La/Yb)N为5.07~8.08.岩石具有中等-微弱负铕异常(δEu=0.73~0.97,平均值为0.82),暗示岩石可能在形成过程中斜长石分离结晶作用较弱或源区斜长石残留较少.

      图  6  马尼特片麻状花岗闪长岩稀土元素配分模式和微量元素蛛网图
      a.球粒陨石值据Boynton(1984);b.原始地幔值据Sun and McDonough(1989)
      Fig.  6.  Chondrite-normalized REE patterns and primitive mantle-normalized trace element patterns for the Manite gneissic granodiorite

      图 6b显示,和原始地幔相比岩石富集大离子亲石元素(Rb、K)和不相容元素(Th、U),不同程度的亏损Nb、Ta、Zr、Ti.样品中反映岩石演化特征的元素比值Nb/Ta=9.85~12.14,La/Nb= 3.82~6.44,Th/Nb=1.19~2.32,Th/La=0.27~0.39,Rb/Sr=0.08~0.33,Rb/Nb=7.47~26.48.

      马尼特地区片麻状花岗闪长岩具有较高的硅(61.47%~63.99%)、相对中等质量分数的铝(14.64%~15.52%)和全碱(3.92%~5.69%)以及准铝质等主量元素特征,岩石具有富集大离子亲石元素(Rb、K)和不相容元素(Th、U),相对亏损Nb、Ta、Zr、Ti高场强元素的特征,反映了其壳源特点(Mckenzie,1989).Ta、Nb以及Ti的亏损暗示岩浆不可能由软流圈部分熔融直接产生(Foley,1992),可能由于地壳的混染作用(Mckenzie,1989)或是源区经历了俯冲过程中的流体交代作用(Sun and McDonough, 1989).Nb和Ta由于性质相近,Nb/Ta比值在岩浆分异中不会造成较大的分异,可以指示岩浆源区特征及演化过程.通常幔源岩浆的Nb/Ta比值为17.5±2.0,壳源岩浆的Nb/Ta比值为11~12(Green,1995),7件片麻状花岗闪长岩样品中,Nb/Ta比值为9.85~12.14,可以反映出岩浆的壳源特点;La/Nb比值(3.82~6.44) 平均为4.63,高于大陆地壳平均值2.5,Th/Nb比值(1.19~2.32) 平均为1.54,远高于大陆地壳平均值0.7,Th/La比值(0.27~0.39) 平均为0.33,也高于大陆地壳平均值0.28(Rudnick and Gao, 2003).综上所述,马尼特地区片麻状花岗闪长岩的微量元素显示出壳源特点.

      锆石具有较强的稳定性,在其形成后基本没有明显的放射性成因Hf的积累,因此成为目前示踪岩浆源区的非常重要的矿物(Ameilin et al., 2000吴福元等,2007).在图 7中,数据点均落在亏损地幔Hf同位素演化线之下,具有高的εHf(t)值(12.2~15.0),Hf两阶段模式年龄在506~662 Ma范围内.对花岗质岩石而言,由于其主要来源于地壳岩石的部分熔融,所以其Hf模式年龄要远大于形成年龄.但若Hf模式年龄与其形成年龄相近,则表明其地壳源区是新生的(吴福元等,2007).马尼特片麻状花岗闪长岩测定的年龄495 Ma与Hf两阶段模式年龄(506~662 Ma)相近,说明新生地壳物质的部分熔融很可能是本区片麻状花岗闪长岩的重要形成机制.Vervoot et al.(2000)Griffin et al.(2004)认为具有正εHf(t)值的花岗质岩石来自亏损地幔或从亏损地幔中新增生的年轻地壳物质的部分熔融,负εHf(t)值则表明地壳Hf同位素为主导.样品具有高εHf(t)锆石,表明亏损地幔中新增生的年轻地壳物质的部分熔融也参与到片麻状花岗闪长岩的形成.结合本次研究认为,马尼特片麻状花岗闪长岩的岩浆源区初始物质主要来源于新生地壳.

      图  7  马尼特片麻状花岗闪长岩锆石的εHf(t)-t图解
      Fig.  7.  εHf(t) versus t diagram of the Manite gneissic granodiorite

      由于野外条件恶劣,地质关系复杂,对于本区片麻状花岗闪长岩的形成年代前人没有做过详细研究.本次作者采用锆石LA-ICP-MS U-Pb定年法对其进行了年代学的测定,所测定的年龄495.6±1.1 Ma代表了片麻状花岗闪长岩的侵位结晶年龄,为晚寒武世.研究表明东昆仑地区存在广泛的晚寒武世岩浆事件,如东昆仑南缘得利斯坦蛇绿岩的形成时代为516.0±6.3 Ma(刘战庆等,2011a),都兰可可沙石英闪长岩体的形成时代为515.2±4.4 Ma(张亚峰等,2010),东昆仑清水泉地区出露的中高压麻粒岩年龄为507.7±8.3 Ma(李怀坤等,2006),东昆仑南部阿尼玛卿地区出露的德尔尼闪长岩形成时代为493±6 Ma(李王晔等,2007),昆南沟里地区的花岗闪长岩形成时代为491.4±7.2 Ma(刘成东,2008),祁漫塔格山鸭子泉岛弧闪长岩形成时代为480±3 Ma(崔美慧等,2011),祁漫塔格地区乌兰乌珠尔铜矿中酸性侵入岩的形成时代为475.3±2.0 Ma(许庆林,2014),东昆仑早古生代纳赤台岩群变火山岩形成时代为474±7.9 Ma(陈有炘等,2013).上述的年龄数据表明,东昆仑地区在晚寒武世存在有构造-热事件并导致广泛的变质和深熔作用发生.

      马尼特片麻状花岗闪长岩在微量元素Rb-(Y+Nb)构造判别图解(图 8a)中,样品全部落入火山弧花岗岩区域.岩石不同程度的亏损Nb、Ta、Zr和Ti,表明了与火山弧构造环境的亲缘性.La/Nb比值(3.82~6.44) 平均为4.63,这也与Salters and Hart(1991)认为在活动大陆边缘区的La/Nb比值(>2) 是相符的.在图 8b中,样品主要落入板块碰撞前消减区花岗岩区域,相当于活动板块边缘.区域上,东昆南阿尼玛卿地区德尔尼闪长岩锆石U-Pb年龄为493±6 Ma(李王晔等,2007),具有富集大离子亲石元素Rb、Th、U,相对亏损高场强元素Nb、Ta、Ti的特性,被认为形成于岛弧环境.马尼特片麻状花岗闪长岩与它相比,在矿物组合以及微量元素特征等方面基本相似,较近的空间关系,相近岩体的形成时代495±1.1 Ma,推测其形成于洋壳俯冲背景下.

      图  8  马尼特片麻状闪长岩构造环境判别图解
      Fig.  8.  Tectonic setting discrimination diagrams of the Manite gneissic granodiorite

      东昆仑地区在加里东期一直处于持续挤压造山的构造背景(潘裕生,1990Sengor and Okurogullan, 1991潘裕生等,1994).孙丰月等(2003)通过研究东昆仑成矿带成矿规律,认为东昆仑加里东早期花岗岩大多数为碰撞前和同碰撞花岗岩,说明在加里东期东昆仑地区已经从被动大陆边缘转化为存在洋壳俯冲的活动大陆边缘.拜永山等(2001)通过对东昆仑东段加里东期造山旋回侵入岩特征研究,认为该区早奥陶世弧花岗岩应形成于俯冲环境.莫宣学等(2007)认为东昆仑东部在早寒武世为洋盆形成及扩张阶段,中寒武世开始进入俯冲阶段,持续到晚奥陶世.张亚峰等(2010)通过对东昆仑造山带都兰可可沙石英闪长岩体年代学研究,认为其形成年龄515.2±4.4 Ma代表了洋盆俯冲开始的时间.李王晔等(2007)测得东昆仑南部的德尔尼岛弧闪长岩年代为493±6 Ma,认为其形成于洋壳消减的时代.崔美慧等(2011)测得祁漫塔格鸭子泉地区的早奥陶世岛弧型闪长岩年龄为480±3 Ma,认为形成于洋壳俯冲环境下.许庆林(2014)测得祁漫塔格地区乌兰乌珠尔铜矿片麻状花岗岩时代为475.3±2.0 Ma,认为乌兰乌珠尔中酸性侵入岩形成的构造环境应为原特提斯洋俯冲的活动大陆边缘环境.上述资料表明东昆仑地区在加里东早期存在一次重要的俯冲事件,结合本次研究认为,马尼特片麻状花岗闪长岩形成的构造环境应为加里东早期原特提斯洋壳俯冲的活动大陆边缘环境,原特提斯洋俯冲到柴达木地块之下造成陆壳加厚,新生的陆壳部分熔融形成马尼特片麻状花岗闪长岩.

      孙丰月等(2003)通过研究纳赤台群火山岩认为在昆中俯冲带以南存在另一个岛弧环境,并提出了在加里东期,柴达木地块和万宝沟大洋玄武岩高原之间的洋壳同时向南、北发生双向俯冲消减.王晓霞等(2012)通过研究柴达木盆地南缘晚奥陶世万宝沟花岗岩,认为如果加里东期在昆南构造带发育有弧花岗岩的话,应该是昆中缝合带向南俯冲的产物或者是阿尼玛卿缝合带向北俯冲的产物.马尼特片麻状花岗闪长岩位于昆南断裂以南,与纳赤台群火山岩和万宝沟群火山岩具有密切的空间关系,推测其应该属于大洋洋壳向南俯冲的产物,即柴达木地块和万宝沟大洋玄武岩高原之间的洋壳同时向南、北发生双向俯冲消减.

      随着新元古代末期Rodinia超大陆的裂解,东昆仑地区演化也进入非常活跃的时期.在早寒武世之前,原特提斯洋打开和扩张(Yang et al., 1996陆松年等,2002).加里东早期,原特提斯洋向南北两侧开始俯冲(图 9).柴达木地块南缘由被动陆缘转换成活动陆缘,形成昆北、昆中的构造格局.随俯冲作用的进行,在昆中一带演化成活动陆缘弧,而昆北一带形成弧后裂陷,同时形成一系列双峰式火山岩组合、镁铁质深成侵入岩和基性脉岩(任军虎等,2009王秉璋,2011刘彬等,2013).此时昆中断裂以南的大洋环境主要为万宝沟群大洋玄武岩高原(阿成业等,2003王国灿等,2007),随着万宝沟大洋高原沿昆中断裂的位置拼贴到柴达木地块之上,致使东昆仑造山带内广泛发生深熔作用,形成很多与俯冲消减作用相关的岛弧型岩浆岩,如阿尼玛卿的德尔尼岛弧型闪长岩(李王晔等,2007)、布青山的白日切特花岗闪长岩(刘战庆等,2011)、亿可哈拉尔花岗闪长岩(边千韬等,1999),推测马尼特片麻状花岗闪长岩也是由万宝沟玄武岩高原俯冲形成的.到中志留世早期原特提斯洋最终关闭(陈能松等,2002曹世泰等,2011刘彬等,2013),此时东昆仑南北三分的格局基本形成.

      图  9  柴达木地块和万宝沟大洋玄武岩高原之间的洋壳同时向南、北发生双向俯冲消减
      Fig.  9.  The crust between the Qaidam massif and Wanbaogou oceanic plateau occurred bidirectional subduction to the south and the north

      (1) 马尼特片麻状花岗闪长岩岩浆锆石LA-ICP-MS U-Pb加权平均年龄为495.6±1.1 Ma,属于晚寒武世.(2) 马尼特片麻状花岗闪长岩属准铝质钙碱性系列岩石,岩石具有富集大离子亲石元素(Rb、K)和不相容元素(Th、U),相对亏损Nb、Ta、Zr、Ti高场强元素的特征,Nb/Ta、La/Nb、Th/Nb、Th/La比值等显示出岩石具有壳源特征.马尼特片麻状花岗闪长岩εHf(t)值为12.2~15.0,Hf两阶段模式年龄在506~662 Ma范围内,其岩浆源区初始物质主要来源于新生地壳.(3) 马尼特片麻状花岗闪长岩在微量元素Rb-(Y+Nb)构造判别图落入火山弧花岗岩区域,在R1-R2构造判别图落入板块碰撞前消减区花岗岩区域.综合岩石组合及地球化学特征认为其构造环境应为加里东早期原特提斯洋壳俯冲的活动大陆边缘环境洋壳俯冲环境,推测其应该属于大洋洋壳向南俯冲的产物,即柴达木地块和万宝沟大洋玄武岩高原之间的洋壳同时向南、北发生双向俯冲消减.

    • 图  1  马尼特地区地质简图

      1.第四系;2.中二叠世马尔争组板岩、千枚岩;3.中二叠世马尔争组砂岩、砾岩;4.华力西期花岗闪长岩;5.华力西期闪长玢岩脉;6.片麻状花岗闪长岩;7.正断层/逆断层;8.构造蚀变破碎带;9.研究区位置;10.岩体位置及取样位置;据青海省第三地质矿产勘查院,2013.青海省都兰县马尼特地区金矿普查2012年工作总结及2013年工作安排.青海

      Fig.  1.  The sketch geological map of the Manite area

      图  2  马尼特片麻状花岗闪长岩显微照片

      a.片麻状花岗闪长岩中定向的角闪石(单偏光);b.片麻状花岗闪长岩中角闪石的简单双晶及闪石式解理、石英、斜长石的聚片双晶(正交偏光).矿物代号缩写:Qtz.石英,Pl.斜长石,Hbl.角闪石,Al.碱性长石

      Fig.  2.  The micrographs of the Manite gneissic granodiorite

      图  3  马尼特片麻状花岗闪长岩锆石阴极发光图像

      Fig.  3.  Cathodoluminescence images of analyzed zircons of the Manite gneissic granodiorite

      图  4  马尼特片麻状花岗闪长岩锆石U-Pb年龄谐和图

      Fig.  4.  U-Pb concordia ages of the Manite gneissic granodiorite

      图  5  马尼特片麻状花岗闪长岩TAS、SiO2-K2O和A/CNK-A/NK

      a.据Irvine and Baragar(1971);b.据Peccerillo and Taylor(1976);c.据Maniar and Piccoli(1989)

      Fig.  5.  Total alkali versus SiO2, SiO2 versus K2O and A/CNK versus A/NK diagrams for the Manite gneissic granodiorite

      图  6  马尼特片麻状花岗闪长岩稀土元素配分模式和微量元素蛛网图

      a.球粒陨石值据Boynton(1984);b.原始地幔值据Sun and McDonough(1989)

      Fig.  6.  Chondrite-normalized REE patterns and primitive mantle-normalized trace element patterns for the Manite gneissic granodiorite

      图  7  马尼特片麻状花岗闪长岩锆石的εHf(t)-t图解

      Yang et al.(2006)

      Fig.  7.  εHf(t) versus t diagram of the Manite gneissic granodiorite

      图  8  马尼特片麻状闪长岩构造环境判别图解

      a.据Harris et al.(1986);b.据Pearce(1996)

      Fig.  8.  Tectonic setting discrimination diagrams of the Manite gneissic granodiorite

      图  9  柴达木地块和万宝沟大洋玄武岩高原之间的洋壳同时向南、北发生双向俯冲消减

      Sun et al.(2003)

      Fig.  9.  The crust between the Qaidam massif and Wanbaogou oceanic plateau occurred bidirectional subduction to the south and the north

      表  1  马尼特片麻状花岗闪长岩锆石LA-MC-ICP-MS U-Pb同位素定年数据

      Table  1.   LA-MC-ICP-MS zircon U-Pb isotope dating results of the Manite gneissic granodiorite

      测点号 质量百分含量(10-6) Th/U 同位素比率 同位素年龄(Ma)
      PbThU 207Pb/206Pb1σ207Pb/235U1σ206Pb/238U207Pb/206Pb1σ207Pb/235U1σ206Pb/238U1σ
      MNT-N4-143.992.12750.330.056 80.002 00.626 60.021 30.079 50.000 848381494134935
      MNT-N4-288.1196.05150.380.056 70.003 20.633 20.032 50.080 30.001 0480131498204986
      MNT-N4-339.879.92760.290.057 10.001 80.622 90.019 20.079 00.000 849470492124905
      MNT-N4-441.079.53000.270.055 80.001 80.615 60.018 80.080 10.000 744377487124964
      MNT-N4-527.957.41830.310.054 30.002 40.621 00.028 50.082 10.001 038398490185096
      MNT-N4-639.078.32960.260.057 00.001 90.622 70.019 50.079 40.000 950072492124935
      MNT-N4-758.4122.03780.320.056 70.001 50.627 80.019 90.080 00.001 248061495124967
      MNT-N4-870.3151.04240.360.057 00.001 60.630 20.018 40.080 00.000 750060496114964
      MNT-N4-939.073.22720.270.056 90.001 90.626 60.021 00.079 80.000 848774494134955
      MNT-N4-1097.0230.05290.430.056 40.001 60.623 80.018 00.080 10.000 647832492114974
      MNT-N4-1143.798.13150.310.056 90.001 90.631 30.022 40.080 10.001 148777497144977
      MNT-N4-12111.0246.07510.330.056 90.001 40.630 10.016 00.080 00.000 948752496104965
      MNT-N4-1390.0210.05770.360.057 30.001 40.631 20.015 10.079 50.000 65025249794934
      MNT-N4-1465.6156.03360.470.057 10.001 70.631 00.018 90.079 80.000 749467497124954
      MNT-N4-15113.0279.05600.500.056 20.001 60.622 30.016 90.080 10.000 745763491114964
      MNT-N4-1653.7121.03140.390.056 50.002 00.624 40.021 50.080 00.000 947878493134965
      MNT-N4-1742.093.82330.400.057 10.002 30.630 20.024 70.079 70.000 849461496154945
      MNT-N4-1845.5113.02280.490.056 90.002 00.631 20.021 50.080 20.000 848778497134975
      MNT-N4-1959.2121.04350.280.057 30.001 60.630 80.017 50.079 30.000 950261497114925
      MNT-N4-2067.2142.04760.300.056 80.001 60.628 90.018 00.079 60.000 848361495114935
      注:测试单位和测试时间:中国地质大学(武汉)地质过程与矿产资源国家重点实验室,2014.
      下载: 导出CSV

      表  2  马尼特片麻状花岗闪长岩锆石Lu-Hf同位素组成

      Table  2.   Zircon Lu-Hf isotopic compositions of the Manite gneissic granodiorite

      测点号 176Hf/177Hf 2σ 176Lu/177Hf 2σ 176Yb/177Hf 2σ εHf(0) εHf(t) 2σ tDM1(Ma) tDM2(Ma) fLu/Hf
      MNT-N4-1 0.282 821 0.000 021 0.001 279 0.000 035 0.034 368 0.000 971 1.7 12.2 0.9 615 662 -0.96
      MNT-N4-20.282 8700.000 0260.001 3710.000 0160.035 8800.000 6753.513.91.0547567-0.96
      MNT-N4-30.282 8620.000 0200.001 0150.000 0470.025 6040.001 0543.213.80.9553576-0.97
      MNT-N4-40.282 8890.000 0330.001 1360.000 0210.029 4920.000 5544.214.71.3516524-0.97
      MNT-N4-50.282 8460.000 0340.000 9160.000 0370.024 8770.001 1242.613.21.3574605-0.97
      MNT-N4-60.282 8310.000 0230.000 9170.000 0190.023 1600.000 3162.112.71.0596636-0.97
      MNT-N4-70.282 8850.000 0250.001 1160.000 0260.028 9860.000 7374.014.51.0522533-0.97
      MNT-N4-80.282 8830.000 0250.001 1030.000 0260.028 3730.000 5583.914.51.0524536-0.97
      MNT-N4-90.282 8570.000 0240.001 1260.000 0090.028 8750.000 1583.013.61.0562587-0.97
      MNT-N4-100.282 8440.000 0170.001 7380.000 0390.043 3940.001 1242.512.90.8590625-0.95
      MNT-N4-110.282 8300.000 0250.001 0030.000 0050.025 5020.000 0802.012.61.0598639-0.97
      MNT-N4-120.282 8630.000 0280.001 0460.000 0240.026 5220.000 6983.213.81.1553575-0.97
      MNT-N4-130.282 8980.000 0340.001 0270.000 0500.025 4910.001 3834.415.01.3503506-0.97
      MNT-N4-140.282 8910.000 0280.001 3720.000 0410.038 0840.001 1234.214.71.1517525-0.96
      MNT-N4-15 0.282 898 0.000 037 0.002 090 0.000 049 0.057 525 0.000 655 4.4 14.7 1.4 517 525 -0.94
      下载: 导出CSV

      表  3  马尼特片麻状花岗闪长岩主量元素(%)、稀土元素及微量元素(10-6)分析结果

      Table  3.   Major(%), REE and trace (10-6) element compositions of the Manite gneissic granodiorite

      样号MNT-1MNT-2MNT-3MNT-4MNT-5MNT-6MNT-7
      SiO262.6461.6761.8063.2863.1961.4763.99
      TiO20.380.390.380.360.360.390.39
      Al2O315.5214.8414.9914.6414.7914.8115.37
      Fe2O36.397.367.226.566.427.285.96
      MnO0.160.160.150.140.140.150.14
      MgO2.713.603.553.123.403.642.04
      CaO4.676.286.045.875.386.524.29
      Na2O3.642.932.913.353.292.993.38
      K2O1.941.081.161.021.310.932.31
      P2O50.110.090.090.100.100.090.11
      LOI1.741.521.621.491.551.651.94
      Total99.999.9299.9199.9399.9399.9299.92
      K2O/Na2O0.530.370.400.300.400.310.68
      A/CNK0.930.850.880.850.890.830.97
      A/NK1.922.482.482.212.162.501.91
      K2O+Na2O5.584.014.074.374.603.925.69
      V140162161148143172123
      Cr31.062.157.450.965.062.613.5
      Cs1.0800.7960.8390.7571.0800.7261.20
      Ga11.509.9410.009.4910.509.869.97
      Hf1.271.221.241.261.391.091.15
      Rb73.924.529.227.842.420.477.6
      Sr268269282269292259234
      Zr32.525.732.328.635.624.030.3
      Nb3.372.632.853.133.632.732.93
      Ba598426464299385292626
      Ta0.320.270.250.290.300.260.27
      Th7.843.263.544.265.393.265.64
      U1.431.511.481.51.441.481.22
      Y13.611.911.711.112.11210.3
      La21.711.810.914.015.011.414.2
      Ce36.921.121.124.427.520.624.9
      Pr4.032.452.402.783.112.382.77
      Nd14.709.649.5110.5011.909.6910.10
      Sm2.832.022.132.062.512.061.96
      Eu0.770.580.530.530.640.590.61
      Gd2.912.092.192.282.782.101.85
      Tb0.470.400.350.420.410.340.32
      Dy2.472.092.091.952.262.161.75
      Ho0.520.440.440.400.460.430.36
      Er1.621.401.431.311.441.391.12
      Tm0.260.220.230.230.230.220.20
      Yb1.811.531.451.511.641.501.29
      Lu0.290.240.230.230.250.230.22
      δEu0.820.850.740.750.730.850.97
      ΣREE91.2755.9954.9862.6070.1355.0961.64
      LREE80.9347.5946.5754.2760.6546.7254.54
      HREE10.348.408.428.339.478.377.10
      LREE/HREE7.835.675.536.526.405.587.68
      (La/Yb)N8.085.205.076.256.175.127.42
      Rb/Sr0.280.090.100.100.150.080.33
      Rb/Nb21.939.3210.258.8811.687.4726.48
      Nb/Ta10.609.8511.2610.9812.1410.7110.89
      La/Nb6.444.493.824.474.134.184.85
      Th/Nb2.331.241.241.361.481.191.92
      Th/La0.360.280.320.300.360.290.40
      注:LOI.烧失量;A/CNK=Al2O3/(CaO+Na2O+K2O)摩尔比;δEu=2×(Eu/0.0735)/(Gd/0.259+Sm/0.195);LREE=La+Ce+Pr+Nd+Sm+Eu;HREE=Gd+Tb+Dy+Ho+Er+Tm+Yb+Lu;(La/Yb)N=(La/0.310)/(Yb/0.209).
      下载: 导出CSV
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