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晋陕交界涑水杂岩LA-ICP-MS锆石U-Pb年龄和Hf同位素组成及其地质意义

王建其, 刘祥, 第五春荣

王建其, 刘祥, 第五春荣. 2017: 晋陕交界涑水杂岩LA-ICP-MS锆石U-Pb年龄和Hf同位素组成及其地质意义. 地质通报, 36(2-3): 392-401.
引用本文: 王建其, 刘祥, 第五春荣. 2017: 晋陕交界涑水杂岩LA-ICP-MS锆石U-Pb年龄和Hf同位素组成及其地质意义. 地质通报, 36(2-3): 392-401.
WANG Jianqi, LIU Xiang, DIWU Chunrong. 2017: LA-ICP-MS zircon U-Pb dating and Hf isotopic compositions of rocks from the Sushui complex in Shanxi-Shaanxi border area and their geological significance. Geological Bulletin of China, 36(2-3): 392-401.
Citation: WANG Jianqi, LIU Xiang, DIWU Chunrong. 2017: LA-ICP-MS zircon U-Pb dating and Hf isotopic compositions of rocks from the Sushui complex in Shanxi-Shaanxi border area and their geological significance. Geological Bulletin of China, 36(2-3): 392-401.

晋陕交界涑水杂岩LA-ICP-MS锆石U-Pb年龄和Hf同位素组成及其地质意义

基金项目: 

国家自然科学基金项目《国家创新研究群体:大陆构造与动力学》 批准号:41421002

《华北克拉通南缘早前寒武纪构造-热事件及其地质意义》 批准号:41672188

《华北克拉通南缘豫陕地区古元古代构造-热事件研究》 批准号:41272004

详细信息
    作者简介:

    王建其 (1960-), 男, 工程师, 从事地球化学分析和研究。E-mail:wangjianqi@nwu.edu.cn

  • 中图分类号: P597+.3

LA-ICP-MS zircon U-Pb dating and Hf isotopic compositions of rocks from the Sushui complex in Shanxi-Shaanxi border area and their geological significance

  • 摘要:

    涑水杂岩作为华北克拉通南部早前寒武纪变质基底杂岩的重要组成部分,以中条山地区出露最好且研究程度最高。在晋陕交界处的韩城和河津地区也有零星的古老变质基底杂岩出露,通常认为是中条山地区涑水杂岩的西延。用LA-ICP-MS锆石U-Pb方法测得研究区内的基底岩石角闪斜长片麻岩、透辉斜长片麻岩和二长花岗片麻岩原岩的形成年龄分别为2260±28Ma、2053±34Ma和2098±27Ma,表明晋陕交界处涑水杂岩的形成年龄明显小于中条山地区的涑水杂岩,其形成时代主要应为古元古代早期,而非太古宙。锆石Hf同位素显示,所分析的锆石多数具有低εHf(t) 值,最低可达-6,其二阶段模式年龄为2630~2933Ma,表明这些形成于古元古代的岩石为太古宙岩石再循环的产物,暗示在晋陕交界处可能存在太古宙的古老地壳物质,同时也支持华北克拉通南部太古宙地块划分的推论。

    Abstract:

    The Sushui complex is one of the main component parts of basement rocks in southern North China Craton (NCC). It is typically exposed in Zhongtiaoshan area and has been studied in detail. The Early Precambrian metamorphic basement complex rocks sporadically exposed in Shanxi-Shaanxi border area are traditionally regarded as the western extension and equivalents of Sushui complex in Zhongtiao region. LA-ICP-MS zircon U-Pb dating reveals that the protolithic ages of amphibolite-plagioclase gneiss, diopside-plagioclase gneiss and two-feldspar granite gneiss are 2260 ± 28Ma, 2053 ± 34Ma and 2098 ± 27Ma, respectively, significantly younger than the ages of rocks in Zhongtiaoshan area, suggesting that the Sushui complex was likely formed in Early Paleoproterozoic rather than in Archean. The majority of zircons of the samples have negative εHf(t) values (the lowerest being-6) with two-stage crustal model ages of 2630~2933Ma, which suggests that these samples were derived from recycled Mesoarchean to Neoarchean crust, and continental crustal materials as old as 2630~2933Ma probably preexisted in the Shanxi-Shaanxi border area. These results provide further evidence for the inference that the southern NCC was likely a coherent ancient terrane at the end of the Neoarchean.

  • 华北克拉通南部广泛分布新太古代—古元古代的前寒武纪变质基底和较完整的中、新元古代盖层,是中国前寒武纪地质研究的经典地区之一[1-3].这些古老变质基底杂岩主体呈近东西向展布,自北向南可分为涑水杂岩(图 1-a)、登封杂岩和太华杂岩.类似的杂岩体向西可延伸至甘肃陇山地区,称为陇山杂岩[6];向东可延伸至安徽的霍邱和蚌埠地区,分别称为霍邱群和五河群[7-9].鉴于这些杂岩具有明显相似的岩石组成、形成时代、变质变形等特征,最近一些研究者提出这些杂岩在太古宙末期就已经拼合形成一个统一的南部古老块体[110],而且这一块体明显跨越赵国春等[411-13]划分的中部带的南部,也显著不同于翟明国等[14-15]划分的许昌地块.

    图  1  华北克拉通前寒武纪地质简图[4](a) 和中条山地区地质简图 (b)[5]
    Figure  1.  Subdivision of the North China Craton (a) and geological map of the Zhongtiaoshan area (b)

    在晋陕交界的韩城和河津地区也有零星的古老变质杂岩出露,亦被陕西和山西区域地质调查单位命名为“涑水杂岩”,并认为其是中条山地区涑水杂岩的西延[2-3]图 2),但主要依据残缺不全的岩石特征和组合及变质变形的区域性对比研究,缺少精确的年代学证据.本文报道了晋陕交界涑水杂岩的锆石U-Pb年龄及其Hf同位素组成,探讨涑水杂岩的时空展布、形成和演化规律,并讨论其地质意义.

    作为华北克拉通南部前寒武纪变质基底杂岩的重要组成部分,“涑水杂岩”早期曾被称为“五台系”或“中条系”.后称其为“涑水杂岩”,并于1959年的全国地层会议上正式启用,主要指呈北东—南西向分布在中条山脉西侧绛县—闻喜—夏县—解州—永济一带的中高级变质基底岩石,延伸上百千米[2-3]图 1-b).根据岩石组合及其年代学数据,中条山地区的涑水杂岩由形成于新太古代—古元古代早期的深成侵入岩和表壳岩组成[516-18]:前者包括新太古代北峪、寨子、西窑TTG质片麻岩和横岭关、解州二长花岗片麻岩,以及古元古代烟庄钾长花岗岩;后者主要由冷口和柴家窑表壳岩组成.这些岩石后期遭受了角闪岩相变质作用,局部变质程度较深,如稷山地区的涑水杂岩变质程度可达麻粒岩相[19].其上依次被古元古代绛县群、中条群、担山石群及中元古代西阳河群和汝阳群覆盖.

    晋陕交界处的韩城市阳山庄村和河津市禹门口—西磑口地区的大地构造位置处于鄂尔多斯地块的东南缘,涑水杂岩在这里仅零星出露(图 2).在韩城的阳山庄地区涑水杂岩出露非常有限[2],主要见于矿坑之中,岩性多为斜长闪长(花岗)片麻岩、黑云更长片麻岩、角闪更长片麻岩、夹角闪斜长片麻岩、磁铁石英岩及脉状磁铁矿,岩石遭受强烈深熔-混合岩作用和改造.阳山庄铁矿的磁铁矿体赋存于该区涑水杂岩中.在河津市禹门口—西磑口地区涑水杂岩以二长花岗片麻岩为主.研究区的涑水杂岩均被霍山组砂岩覆盖(图 3-a),其上为华北克拉通典型的寒武系和奥陶系.其中霍山组砂岩主要由石英岩夹石英砂岩组成,中上部夹长石石英砂岩,底部为砾岩;砂岩发育板状斜层理.对于霍山组砂岩的时代归属,长久以来存在很大争议.由于该砂岩呈角度不整合覆盖于太古宙的片麻岩之上,一些研究者将其划为前震旦系(当时属震旦系);另一些研究者则认为,霍山组砂岩与上覆寒武系不同层位之间均为连续沉积,故而将其归属为寒武系[320-21].

    图  2  晋陕交界区地质简图
    Figure  2.  Geological map of Shanxi-Shaanxi border area
    图  3  晋陕交界涑水杂岩的锆石U-Pb年龄和Hf同位素组成
    Figure  3.  Zircon U-Pb dating and Hf isotopic compositions of rocks from the Sushui complex in Shanxi-Shaanxi border area

    样品12YSZ03和12YSZ031采自韩城市阳山庄村西北的铁矿矿坑,样品12XWK03则采自河津市西磑口.

    样品12YSZ03为角闪斜长片麻岩(图版Ⅰ-bc),由于含铁矿而使岩石呈肉红色,为中-粗粒变晶结构,片麻状构造;主要由斜长石(60%)、角闪石(35%)和少量石英(2%)、磁铁矿(3%)和透辉石(<1%)组成,副矿物有锆石、磷灰石等.其中斜长石表面混浊,多呈土灰色或褐灰色,已被蚀变为绢云母或粘土矿物;角闪石部分被蚀变为绿泥石,且有磁铁矿析出.样品12YSZ031为透辉斜长片麻岩(图版Ⅰ-d),中-粗变晶结构,片麻状构造;主要由斜长石(55%)和透辉石(45%)组成,其中透辉石局部蚀变为角闪石,有磁铁矿析出.样品12XWK03为二长花岗片麻岩(图版Ⅰ-e),岩石呈肉红色,为中粗粒花岗变晶结构,弱片麻状构造;主要由微斜长石(35%)、斜长石(30%)、石英(30%)和少量云母(<5%)组成,副矿物为磷灰石、锆石等.该岩石直接被灰白色厚层块状的霍山组砂岩覆盖,二者之间可见褐铁矿化古风化壳.

      图版Ⅰ  a.河津市西磑口样品;b.韩城市阳山庄角闪斜长片麻岩;c.角闪斜长片麻岩;d.透辉斜长片麻岩;e.二长花片麻岩.Pl—斜长石;Mic—微斜长石;Di—透辉石;Amp—角闪石;Qz—石英;Mt—磁铁矿

    本次研究的锆石从约5kg的样品中挑选出来,经人工重砂、重液、电磁仪等多种方法分离,在双目显微镜下将其镶嵌在环氧树脂中并抛光至锆石颗粒的2/3裸露,然后进行阴极发光(CL)显微图像、激光拉曼光谱、LA-ICP-MS锆石U-Pb年代学及LA-MCICP-MS锆石Lu-Hf同位素分析.锆石挑选工作在河北省区域地质矿产调查研究所完成,其余的分析测试均在西北大学大陆动力学国家重点实验室完成.

    锆石U-Pb定年工作在连接Geolas-193型紫外激光剥蚀系统的Agilient 7500a型ICP-MS上进行.激光剥蚀斑束直径为32μm, 频率为6Hz.采样为单点剥蚀方式.以氦气作为剥蚀物质的载气.ICP-MS数据采集选用跳峰(Peak jumping)方式,数据处理采用Glitter(ver 4.0)程序,年龄计算时以标准锆石91500为外标进行同位素比值分馏校正.样品的谐和图、加权平均年龄计算及绘制均采用Isoplot(ver 2.49)[22].元素浓度采用NIST610作外标,Si作内标计算.

    锆石原位Lu-Hf同位素测定在英国Nu公司生产的Nu Plasma HR多接收器等离子体质谱仪上完成,激光剥蚀系统为德国MicroLas公司生产的Geo-Las200M.激光剥蚀的脉冲频率为10Hz, 激光束直径为44μm, 能量密度为10J· cm-2,剥蚀时间约为50s.锆石原位Lu-Hf同位素测定用176Lu/175Lu=0.02669和176Yb/172Yb=0.5886进行同量异位干扰校正计算,测定样品的176Lu/177Hf和176Hf/177Hf值[23].εHf (t) 的计算采用176Lu衰变常数为1.867×10-11a[24],球粒陨石现今的176Hf/177Hf=0.282785、176Lu/177Hf=0.0336 [25];Hf亏损地幔模式年龄(TDM1)的计算采用现今的亏损地幔176Hf/177Hf=0.28325和176Lu/177Hf=0.0384[26].Hf同位素单阶段模式年龄TDM以亏损地幔为参考计算.回算二阶段Hf模式年龄(TDM2)时,采用的平均地壳176Lu/177Hf值为0.015[27].

    晋陕交界涑水杂岩中锆石的U-Pb和Hf同位素组成分析结果见表 1和图 4.

    表  1  晋陕交界涑水杂岩锆石U-Th-Pb年龄
    Table  1.  Zircon U-Th-Pb dating of the Sushui complex in Shanxi-Shaanxi border area
    样品号含量/10-6Th/U同位素比值年龄/Ma
    PbThU207Pb/206Pb207Pb/235U206Pb/238U207Pb/206Pb207Pb/235U206Pb/238U
    角闪斜长片麻岩 (12YSZ03)
    12YSZ03-011332332990.780.13970.00457.4050.1350.38470.0063222354216216209829
    12YSZ03-021282103040.690.14160.00457.0950.1290.36370.0060224754212316200028
    12YSZ03-03861321950.680.14350.00477.5060.1420.37970.0063226955217417207529
    12YSZ03-041473263400.960.14210.00457.3110.1280.37320.0061225354215016204528
    12YSZ03-0586931880.500.14390.00477.7600.1480.39130.0065227555220417212930
    12YSZ03-06971252050.610.14330.00468.0220.1510.40620.0067226855223417219731
    12YSZ03-071362343140.750.14030.00457.2090.1320.37290.0061223154213816204329
    12YSZ03-08951512060.740.14020.00467.6950.1500.39840.0067222956219618216231
    12YSZ03-091142022610.770.13950.00457.2320.1350.37630.0062222055214117205929
    12YSZ03-101102312530.910.14010.00457.2640.1340.37610.0062222955214416205829
    12YSZ03-1183811860.440.14140.00467.5180.1440.38590.0064224455217517210430
    12YSZ03-121402493290.760.13950.00457.0870.1300.36880.0060222155212316202428
    12YSZ03-13921372130.640.14030.00467.1690.1380.37070.0062223156213317203329
    12YSZ03-14991252020.620.14390.00478.3710.1620.42210.0070227555227218227032
    12YSZ03-1592731970.370.13920.00537.7460.2110.40380.0076221765220225218735
    12YSZ03-161312272860.800.14030.00457.6580.1410.39600.0065223155219217215130
    12YSZ03-171392653060.870.14280.00487.7250.1610.39250.0067226257220019213431
    12YSZ03-181071182380.500.14040.00467.5390.1420.38950.0064223355217817212130
    12YSZ03-191312212850.780.14030.00497.6650.1720.39640.0069223159219320215232
    12YSZ03-201111332570.520.14220.00467.2950.1330.37230.0061225454214816204029
    透辉斜长片麻岩 (12YSZ031)
    12YSZ031-011042594320.600.12720.00493.6520.1030.20830.0039206066156122122021
    12YSZ031-02954034080.990.13300.00503.7550.1000.20470.0038213864158321120020
    12YSZ031-03942703730.720.13100.00443.9330.0860.21780.0038211158162018127020
    12YSZ031-04952483790.650.13350.00494.0070.1040.21760.0040214563163621126921
    12YSZ031-051044714231.110.13440.00474.0120.0930.21630.0038215659163719126320
    12YSZ031-06972253760.600.13260.00564.0670.1340.22250.0045213372164827129524
    12YSZ031-07963943641.080.13160.00514.1600.1190.22930.0044211966166623133123
    12YSZ031-081062663710.720.12910.00514.3490.1300.24440.0047208668170325141024
    12YSZ031-09982263580.630.13210.00424.3720.0840.23990.0041212655170716138621
    12YSZ031-1054781870.410.12860.00714.4880.2140.25300.0063207994172940145432
    12YSZ031-11112793860.200.13000.00414.5880.0870.25580.0043209855174716146822
    12YSZ031-12982523280.770.12780.00434.6020.1000.26120.0045206758175018149623
    12YSZ031-13821542650.580.13110.00434.8810.0980.27010.0046211256179917154123
    12YSZ031-14852022570.790.12660.00445.0110.1180.28700.0051205260182120162725
    12YSZ031-151032072940.700.12830.00465.3360.1320.30160.0055207562187521169927
    12YSZ031-1689702510.280.12690.00415.3930.1050.30830.0052205556188417173226
    12YSZ031-17761072000.540.13060.00476.0700.1540.33670.0062210762198622187130
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    样品角闪斜长片麻岩(12YSZ03)中的锆石呈短柱状或椭圆状,长度多为50~150μm, 长宽比为1:1~2:1,其阴极发光性较差.对20粒锆石进行LA-ICP-MS U-Pb年龄测定,分析点均位于无明显岩浆成分韵律环带的核部区域(图 3-a),分析点具有中等的Th(73×10-6~326×10-6)和U(186×10-6~340×10-6)含量,以及高的Th/U值(0.37~0.96),且具有与岩浆锆石类似的稀土元素配分模式特征,表明这些锆石为岩浆成因.在锆石U-Pb年龄谐和图(图 3-a)上,除少数分析点位于谐和线上外,多数沿不一致线分布,表明锆石可能经历了后期变质作用的扰动,放射成因铅有不同程度的丢失,上交点年龄为2260±28Ma(MSWD=0.64),此年龄代表该片麻岩原岩的形成年龄.

    对样品透辉斜长片麻岩(12YSZ031)中的17粒锆石进行U-Pb同位素年龄分析.所分析的锆石多为短柱状或椭圆状,粒径多为80~120μm.具有较低-中等的Th(70×10-6~472×10-6)和U(187×10-6~432×10-6)含量,以及高的Th/U值(0.20~1.11),且具有与岩浆锆石类似的稀土元素配分模式特征,表明这些锆石为岩浆成因.在锆石U-Pb年龄谐和图(图 3-b)上,所有分析的锆石均有不同程度的铅丢失,数据点沿不一致线分布,不一致线与谐和线的交点年龄为2053±34Ma(MSWD=0.97),此年龄应为透辉斜长片麻岩原岩的形成年龄.

    采自西磑口的二长花岗片麻岩(12XWK03)中的锆石呈黄褐色,半自形-自形柱状,长80~120 μm, 宽50~70μm, 长宽比介于1:1~2:1之间.大多数锆石具有较强的阴极发光性,具核-边结构,锆石核部具有明显的岩浆振荡环带,锆石边部阴极发光性弱,表明后期遭受了明显的构造-热事件作用,边部由于太窄未做分析.对12个锆石的核部进行UPb年龄分析,其Th、U含量和Th/U值分别为83×10-6~405×10-6、162×10-6~423×10-6、0.51~1.24,且锆石具有与岩浆锆石类似的稀土元素配分特征,因此所分析的锆石为岩浆成因.由于锆石核部受到后期地质构造-热事件的影响,所有分析的锆石均发生了不同程度的铅丢失,在谐和图上的投点位于U-Pb年龄谐和线下方,且构成一条线性很好的不一致线,不一致线与谐和线的交点年龄为2098±27Ma(MSWD=0.27)(图 3-c),该年龄代表了二长花岗片麻岩原岩的侵位年龄.

    晋陕交界涑水杂岩中锆石的Hf同位素组成分析结果见表 2图 3-d.所有锆石的176Lu/177Hf值均小于0.002,表明锆石在形成后具有较低的放射性成因Hf的积累,测得的Hf同位素组成可以代表其形成时的Hf同位素组成.

    表  2  晋陕交界涑水杂岩锆石Hf同位素组成
    Table  2.  Zircon Hf isotopic compositions of the Sushui complex in Shanxi-Shaanxi border area
    样品号年龄/Ma176Yb/177Hf176Lu/177Hf(176Hf/177Hf)0(176Hf/177Hf)iεHf (t)TDM1TDM2(CC)TDM2(CC_2014)fLu/Hf
    角闪斜长片麻岩(12YSZ03)
    12YSZ03-01 2260 0.043486 0.001403 0.281450 0.281389 0.000010 1.9 0.3 2545 2709 2648 -0.96
    12YSZ03-02 2260 0.026787 0.000923 0.281402 0.281362 0.000013 0.9 0.5 2578 2768 2700 -0.97
    12YSZ03-03 2260 0.070682 0.002234 0.281411 0.281315 0.000013 -0.8 0.5 2657 2871 2789 -0.93
    12YSZ03-05 2260 0.021740 0.000804 0.281432 0.281398 0.000019 2.2 0.7 2529 2690 2632 -0.98
    12YSZ03-06 2260 0.046220 0.001520 0.281452 0.281387 0.000015 1.8 0.5 2549 2714 2654 -0.95
    12YSZ03-07 2260 0.019108 0.000645 0.281372 0.281344 0.000010 0.2 0.4 2600 2807 2734 -0.98
    12YSZ03-08 2260 0.054515 0.001778 0.281421 0.281344 0.000014 0.3 0.5 2611 2807 2734 -0.95
    12YSZ03-09 2260 0.039883 0.001260 0.281414 0.281360 0.000014 0.8 0.5 2585 2773 2704 -0.96
    12YSZ03-11 2260 0.103130 0.003122 0.281435 0.281300 0.000016 -1.3 0.6 2688 2903 2816 -0.91
    12YSZ03-12 2260 0.015796 0.000542 0.281387 0.281363 0.000017 0.9 0.6 2574 2765 2697 -0.98
    12YSZ03-14 2260 0.046732 0.001466 0.281372 0.281309 0.000021 -1.0 0.8 2657 2884 2800 -0.96
    12YSZ03-15 2260 0.051977 0.001629 0.281432 0.281362 0.000012 0.9 0.4 2585 2768 2700 -0.95
    12YSZ03-16 2260 0.050081 0.001567 0.281417 0.281349 0.000013 0.4 0.5 2601 2795 2723 -0.95
    12YSZ03-17 2260 0.042134 0.001347 0.281401 0.281343 0.000016 0.2 0.6 2608 2809 2735 -0.96
    12YSZ03-18 2260 0.051399 0.001622 0.281402 0.281332 0.000015 -0.2 0.5 2626 2833 2756 -0.95
    12YSZ03-20 2260 0.038482 0.001219 0.281425 0.281372 0.000011 1.2 0.4 2567 2746 2681 -0.96
    透辉斜长片麻岩 (12YSZ031)
    12YSZ031-01 2053 0.024452 0.000861 0.281505 0.281472 0.000013 0.0 0.5 2433 2661 2579 -0.97
    12YSZ031-02 2053 0.040618 0.001427 0.281492 0.281436 0.000021 -1.3 0.7 2488 2738 2646 -0.96
    12YSZ031-04 2053 0.027679 0.000941 0.281520 0.281483 0.000014 0.4 0.5 2418 2636 2558 -0.97
    12YSZ031-05 2053 0.032882 0.001127 0.281486 0.281442 0.000018 -1.1 0.6 2477 2725 2635 -0.97
    12YSZ031-07 2053 0.033591 0.001111 0.281519 0.281475 0.000014 0.1 0.5 2431 2653 2572 -0.97
    12YSZ031-08 2053 0.033288 0.001114 0.281475 0.281432 0.000023 -1.4 0.8 2490 2747 2654 -0.97
    12YSZ031-09 2053 0.034142 0.001181 0.281528 0.281482 0.000026 0.4 0.9 2422 2638 2559 -0.96
    12YSZ031-10 2053 0.032118 0.001058 0.281483 0.281442 0.000019 -1.1 0.7 2476 2725 2635 -0.97
    12YSZ031-11 2053 0.023981 0.000759 0.281487 0.281457 0.000027 -0.5 0.9 2452 2692 2606 -0.98
    12YSZ031-12 2053 0.059430 0.001923 0.281543 0.281468 0.000018 -0.1 0.6 2449 2668 2586 -0.94
    12YSZ031-13 2053 0.050933 0.001590 0.281517 0.281455 0.000016 -0.6 0.6 2464 2697 2611 -0.95
    12YSZ031-14 2053 0.015522 0.000548 0.281519 0.281498 0.000010 0.9 0.4 2395 2603 2529 -0.98
    12YSZ031-16 2053 0.047364 0.001547 0.281555 0.281494 0.000011 0.8 0.4 2409 2611 2536 -0.95
    12YSZ031-17 2053 0.014949 0.000507 0.281501 0.281481 0.000008 0.3 0.3 2417 2640 2561 -0.98
    二长花岗片麻岩 (12XWK03)
    12XWK03-01 2098 0.041136 0.001278 0.281353 0.281302 0.000020 -5.0 0.7 2669 3000 2879 -0.96
    12XWK03-02 2098 0.072607 0.002298 0.281365 0.281274 0.000051 -6.0 1.8 2726 3063 2933 -0.93
    12XWK03-03 2098 0.059392 0.001697 0.281394 0.281326 0.000025 -4.1 0.9 2642 2948 2834 -0.95
    12XWK03-04 2098 0.062262 0.001884 0.281386 0.281311 0.000020 -4.7 0.7 2667 2982 2864 -0.94
    12XWK03-06 2098 0.048828 0.001484 0.281346 0.281287 0.000019 -5.5 0.7 2693 3033 2908 -0.96
    12XWK03-07 2098 0.043049 0.001330 0.281395 0.281342 0.000019 -3.6 0.7 2615 2915 2805 -0.96
    12XWK03-08 2098 0.051850 0.001573 0.281423 0.281360 0.000017 -2.9 0.6 2593 2874 2770 -0.95
    12XWK03-09 2098 0.065822 0.001815 0.281376 0.281303 0.000024 -5.0 0.9 2676 2999 2878 -0.95
    12XWK03-11 2098 0.022580 0.000708 0.281324 0.281296 0.000017 -5.2 0.6 2669 3015 2892 -0.98
    12XWK03-12 2098 0.037852 0.001223 0.281403 0.281354 0.000014 -3.2 0.5 2597 2888 2782 -0.96
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    角闪斜长片麻岩(12YSZ03)样品的16个分析点的176Hf/177Hf值分布于0.281300~0.281389之间,以其形成年龄2260Ma计算Hf(t)为-1.0~2.17,对应的二阶段模式年龄(TDM2)为2630~2816Ma.对透辉斜长片麻岩(12YSZ031)中14粒锆石进行了Hf同位素分析,176Hf/177Hf值变化范围为0.281432~0.281498,以其上交点年龄计算对应的εHf (t) 值,其εHf (t) 值平均为-1.3~0.9,并计算得到其TDM2范围为2536~2646Ma.对二长花岗岩片麻岩(12XWK03)中10粒锆石进行了Hf同位素分析,176Hf/177Hf值变化范围为0.281274~0.281354,以其上交点年龄计算对应的εHf (t) 值,结果均为负值(-6.0~-2.9),并计算得到其TDM2范围为2770~2933Ma.

    如前所述,涑水杂岩以中条山地区出露最典型,由深成侵入岩和表壳岩组成[516-18].目前已知中条山最古老的岩石出露在西南的运城市常平地区,主要岩石类型为奥长花岗片麻岩和闪长质片麻岩,其原岩的形成年龄为2722~2702Ma[28].广泛分布在中条山地区的北峪、寨子、西窑TTG片麻岩,以及横岭关、解州二长花岗片麻岩等花岗质岩石的原岩形成年龄为2620~2436Ma, 其中TTG质片麻岩在中条山地区的中部和东北部占据主要地位,而钙碱性花岗质片麻岩所占规模较小.涑水杂岩中的表壳岩主要出露在运城市柴家窑和绛县冷口地区,其中柴家窑表壳岩以柴家窑一带最为发育,呈规模不等的包体、构造片体分布于西姚片麻岩中,岩石类型为大理岩、浅粒岩、石英岩等.冷口表壳岩则出露于冷口和钻天岭一带,面积约6km2,主要由黑云斜长阳起片岩、黑云片岩、角闪黑云片岩、角闪片岩、斜长角闪岩等组成.Kröner等[29]采用单颗粒锆石蒸发法测得冷口变质英安质凝灰岩锆石的207Pb/206Pb年龄为2521±3Ma, 孙大中等[19]通过Sm-Nd等时线测年方法获得其年龄为2497±51Ma.最近张瑞英[30]利用LAICP-MS锆石U-Pb测年方法测得冷口变质火山岩的年龄为2562±22Ma, 而后期形成年龄为2351±37Ma的烟庄钾质花岗岩在局部侵入于西姚片麻岩及寨子片麻岩和横岭关二长片麻岩中.

    地处晋陕交界处的韩城市阳山庄村和河津市禹门口—西磑口地区也有少量基底岩石出露,陕西和山西地质矿产局通过区域对比,认为其为中条山涑水杂岩的延伸,将其形成时代归属于太古宙[2-3].本次通过LA-ICPMS锆石U-Pb方法测得该区内的角闪斜长片麻岩(12YSZ03)、透辉斜长片麻岩(12YSZ031)和二长花岗岩片麻岩(12XWK03)原岩的形成年龄分别为2260±28Ma、2053±34Ma和2098±27Ma, 据此表明本次所研究的晋陕交界处涑水杂岩的形成年龄明显小于中条山地区的涑水杂岩,其形成时代应为古元古代早期,而非太古宙.

    近十多年来,华北克拉通早前寒武纪地质研究取得了许多令人瞩目的进展.现今,研究者大都认为,华北克拉通的前寒武纪基底由多个陆块拼合而成,虽然对于其拼合机制、拼合时间及拼合的过程一直存在很大争议[11-1531-37].如伍家善等[36]将华北克拉通变质基底划分为胶辽、迁怀、晋冀、豫皖和蒙陕5个微陆块.翟明国等[14-1537]通过对重要的古老构造边界的识别,将华北克拉通划分为胶辽陆块、阜平陆块、迁怀陆块、许昌陆块、集宁陆块和阿拉善陆块,认为这些微古陆块在2.5Ga左右聚合成为统一的华北克拉通.Zhao等[11-13]根据变质作用特点差异并结合相关岩石学、年代学、地球化学等资料,最初将华北克拉通三分,划分为东部陆块、西部陆块及夹持于二者之间的中部造山带.后他们又对上述前寒武纪构造单元划分方案进一步细分,把原西部陆块划分为北部阴山地块、南部的鄂尔多斯地块及二者之间的孔兹岩带;在原东部陆块中识别出胶-辽-吉活动带,将东部陆块二分,最终将华北克拉通基底六分;认为阴山地块和鄂尔多斯地块是在1.95Ga沿孔兹岩带发生碰撞对接形成西部陆块,而后西北陆块与东部陆块沿中部带碰撞形成统一的华北克拉通结晶基底.Kusky等[33-34]承袭了东部地块、西部地块和中部造山带华北地块三分的构造格局,但认为东部地块与西部地块在2.5Ga时以弧/陆形式汇聚,而1.85Ga左右的吕梁运动属于陆内裂解事件.最近,Wan等[10]根据古老岩石(≥2.6Ga)的出露和年代学资料,将华北克拉通前寒武纪基底划分为东部、西部和南部3个古老陆块.

    鉴于华北克拉通南部的古老杂岩体,如涑水杂岩、登封杂岩、太华杂岩等具有显著相似的岩石组成、形成时代、变质变形等特征,Diwu等[1]最近提出华北克拉通南部前寒武纪基底在太古宙末期(约2.5Ga)已经拼贴形成一个统一的块体,称为南部太古宙地块.这些古老变质基底岩石呈近东西向展布,向西可至甘肃陇山地区[6],向东可延伸至安徽的霍邱和蚌埠地区[7-9],主要由TTG质片麻岩、闪长质片麻岩、斜长角闪岩、钙碱性花岗岩等组成,其演化历史可以追溯至冥古宙时期[38-39].虽然在晋陕交界处的韩城市阳山庄村和河津市禹门口—西磑口地区至今未见太古宙岩石的报道,可是锆石Hf同位素组成显示,所分析的锆石多数具有低εHf (t) 值,最低可达-6,其二阶段模式年龄为2630~2933Ma(图 3-d),表明这些形成于古元古代早期的岩石均为太古宙的岩石再循环的产物,表明在晋陕交界处可能存在太古宙的古老地壳物质.本次研究也支持南部古老陆块或南部太古宙地块划分的推论.

    (1)利用LA-ICP-MS锆石U-Pb方法测得晋陕交界涑水杂岩中的角闪斜长片麻岩、透辉斜长片麻岩和二长花岗片麻岩原岩的形成年龄分别为2260±28Ma、2053±34Ma和2098±27Ma, 表明本次所研究的晋陕交界处涑水杂岩的形成时代为古元古代早期,而非太古宙.

    (2)锆石Hf同位素数据显示,所分析的锆石多数具有低εHf (t) 值,最低可达-6,其二阶段模式年龄为2630~2933Ma, 表明这些形成于古元古代的岩石为太古宙岩石再循环的产物,暗示在晋陕交界处可能存在太古宙的古老地壳物质.

    致谢: 感谢陕西省地质调查院李海平教授级高工和中国科学院地质与地球物理研究所樊龙刚博士在野外给予的帮助;感谢审稿专家提出的宝贵修改意见.
  • 图  1   华北克拉通前寒武纪地质简图[4](a) 和中条山地区地质简图 (b)[5]

    Figure  1.   Subdivision of the North China Craton (a) and geological map of the Zhongtiaoshan area (b)

    图  2   晋陕交界区地质简图

    Figure  2.   Geological map of Shanxi-Shaanxi border area

    图  3   晋陕交界涑水杂岩的锆石U-Pb年龄和Hf同位素组成

    Figure  3.   Zircon U-Pb dating and Hf isotopic compositions of rocks from the Sushui complex in Shanxi-Shaanxi border area

    图版Ⅰ   a.河津市西磑口样品;b.韩城市阳山庄角闪斜长片麻岩;c.角闪斜长片麻岩;d.透辉斜长片麻岩;e.二长花片麻岩.Pl—斜长石;Mic—微斜长石;Di—透辉石;Amp—角闪石;Qz—石英;Mt—磁铁矿

    表  1   晋陕交界涑水杂岩锆石U-Th-Pb年龄

    Table  1   Zircon U-Th-Pb dating of the Sushui complex in Shanxi-Shaanxi border area

    样品号含量/10-6Th/U同位素比值年龄/Ma
    PbThU207Pb/206Pb207Pb/235U206Pb/238U207Pb/206Pb207Pb/235U206Pb/238U
    角闪斜长片麻岩 (12YSZ03)
    12YSZ03-011332332990.780.13970.00457.4050.1350.38470.0063222354216216209829
    12YSZ03-021282103040.690.14160.00457.0950.1290.36370.0060224754212316200028
    12YSZ03-03861321950.680.14350.00477.5060.1420.37970.0063226955217417207529
    12YSZ03-041473263400.960.14210.00457.3110.1280.37320.0061225354215016204528
    12YSZ03-0586931880.500.14390.00477.7600.1480.39130.0065227555220417212930
    12YSZ03-06971252050.610.14330.00468.0220.1510.40620.0067226855223417219731
    12YSZ03-071362343140.750.14030.00457.2090.1320.37290.0061223154213816204329
    12YSZ03-08951512060.740.14020.00467.6950.1500.39840.0067222956219618216231
    12YSZ03-091142022610.770.13950.00457.2320.1350.37630.0062222055214117205929
    12YSZ03-101102312530.910.14010.00457.2640.1340.37610.0062222955214416205829
    12YSZ03-1183811860.440.14140.00467.5180.1440.38590.0064224455217517210430
    12YSZ03-121402493290.760.13950.00457.0870.1300.36880.0060222155212316202428
    12YSZ03-13921372130.640.14030.00467.1690.1380.37070.0062223156213317203329
    12YSZ03-14991252020.620.14390.00478.3710.1620.42210.0070227555227218227032
    12YSZ03-1592731970.370.13920.00537.7460.2110.40380.0076221765220225218735
    12YSZ03-161312272860.800.14030.00457.6580.1410.39600.0065223155219217215130
    12YSZ03-171392653060.870.14280.00487.7250.1610.39250.0067226257220019213431
    12YSZ03-181071182380.500.14040.00467.5390.1420.38950.0064223355217817212130
    12YSZ03-191312212850.780.14030.00497.6650.1720.39640.0069223159219320215232
    12YSZ03-201111332570.520.14220.00467.2950.1330.37230.0061225454214816204029
    透辉斜长片麻岩 (12YSZ031)
    12YSZ031-011042594320.600.12720.00493.6520.1030.20830.0039206066156122122021
    12YSZ031-02954034080.990.13300.00503.7550.1000.20470.0038213864158321120020
    12YSZ031-03942703730.720.13100.00443.9330.0860.21780.0038211158162018127020
    12YSZ031-04952483790.650.13350.00494.0070.1040.21760.0040214563163621126921
    12YSZ031-051044714231.110.13440.00474.0120.0930.21630.0038215659163719126320
    12YSZ031-06972253760.600.13260.00564.0670.1340.22250.0045213372164827129524
    12YSZ031-07963943641.080.13160.00514.1600.1190.22930.0044211966166623133123
    12YSZ031-081062663710.720.12910.00514.3490.1300.24440.0047208668170325141024
    12YSZ031-09982263580.630.13210.00424.3720.0840.23990.0041212655170716138621
    12YSZ031-1054781870.410.12860.00714.4880.2140.25300.0063207994172940145432
    12YSZ031-11112793860.200.13000.00414.5880.0870.25580.0043209855174716146822
    12YSZ031-12982523280.770.12780.00434.6020.1000.26120.0045206758175018149623
    12YSZ031-13821542650.580.13110.00434.8810.0980.27010.0046211256179917154123
    12YSZ031-14852022570.790.12660.00445.0110.1180.28700.0051205260182120162725
    12YSZ031-151032072940.700.12830.00465.3360.1320.30160.0055207562187521169927
    12YSZ031-1689702510.280.12690.00415.3930.1050.30830.0052205556188417173226
    12YSZ031-17761072000.540.13060.00476.0700.1540.33670.0062210762198622187130
    下载: 导出CSV

    表  2   晋陕交界涑水杂岩锆石Hf同位素组成

    Table  2   Zircon Hf isotopic compositions of the Sushui complex in Shanxi-Shaanxi border area

    样品号年龄/Ma176Yb/177Hf176Lu/177Hf(176Hf/177Hf)0(176Hf/177Hf)iεHf (t)TDM1TDM2(CC)TDM2(CC_2014)fLu/Hf
    角闪斜长片麻岩(12YSZ03)
    12YSZ03-01 2260 0.043486 0.001403 0.281450 0.281389 0.000010 1.9 0.3 2545 2709 2648 -0.96
    12YSZ03-02 2260 0.026787 0.000923 0.281402 0.281362 0.000013 0.9 0.5 2578 2768 2700 -0.97
    12YSZ03-03 2260 0.070682 0.002234 0.281411 0.281315 0.000013 -0.8 0.5 2657 2871 2789 -0.93
    12YSZ03-05 2260 0.021740 0.000804 0.281432 0.281398 0.000019 2.2 0.7 2529 2690 2632 -0.98
    12YSZ03-06 2260 0.046220 0.001520 0.281452 0.281387 0.000015 1.8 0.5 2549 2714 2654 -0.95
    12YSZ03-07 2260 0.019108 0.000645 0.281372 0.281344 0.000010 0.2 0.4 2600 2807 2734 -0.98
    12YSZ03-08 2260 0.054515 0.001778 0.281421 0.281344 0.000014 0.3 0.5 2611 2807 2734 -0.95
    12YSZ03-09 2260 0.039883 0.001260 0.281414 0.281360 0.000014 0.8 0.5 2585 2773 2704 -0.96
    12YSZ03-11 2260 0.103130 0.003122 0.281435 0.281300 0.000016 -1.3 0.6 2688 2903 2816 -0.91
    12YSZ03-12 2260 0.015796 0.000542 0.281387 0.281363 0.000017 0.9 0.6 2574 2765 2697 -0.98
    12YSZ03-14 2260 0.046732 0.001466 0.281372 0.281309 0.000021 -1.0 0.8 2657 2884 2800 -0.96
    12YSZ03-15 2260 0.051977 0.001629 0.281432 0.281362 0.000012 0.9 0.4 2585 2768 2700 -0.95
    12YSZ03-16 2260 0.050081 0.001567 0.281417 0.281349 0.000013 0.4 0.5 2601 2795 2723 -0.95
    12YSZ03-17 2260 0.042134 0.001347 0.281401 0.281343 0.000016 0.2 0.6 2608 2809 2735 -0.96
    12YSZ03-18 2260 0.051399 0.001622 0.281402 0.281332 0.000015 -0.2 0.5 2626 2833 2756 -0.95
    12YSZ03-20 2260 0.038482 0.001219 0.281425 0.281372 0.000011 1.2 0.4 2567 2746 2681 -0.96
    透辉斜长片麻岩 (12YSZ031)
    12YSZ031-01 2053 0.024452 0.000861 0.281505 0.281472 0.000013 0.0 0.5 2433 2661 2579 -0.97
    12YSZ031-02 2053 0.040618 0.001427 0.281492 0.281436 0.000021 -1.3 0.7 2488 2738 2646 -0.96
    12YSZ031-04 2053 0.027679 0.000941 0.281520 0.281483 0.000014 0.4 0.5 2418 2636 2558 -0.97
    12YSZ031-05 2053 0.032882 0.001127 0.281486 0.281442 0.000018 -1.1 0.6 2477 2725 2635 -0.97
    12YSZ031-07 2053 0.033591 0.001111 0.281519 0.281475 0.000014 0.1 0.5 2431 2653 2572 -0.97
    12YSZ031-08 2053 0.033288 0.001114 0.281475 0.281432 0.000023 -1.4 0.8 2490 2747 2654 -0.97
    12YSZ031-09 2053 0.034142 0.001181 0.281528 0.281482 0.000026 0.4 0.9 2422 2638 2559 -0.96
    12YSZ031-10 2053 0.032118 0.001058 0.281483 0.281442 0.000019 -1.1 0.7 2476 2725 2635 -0.97
    12YSZ031-11 2053 0.023981 0.000759 0.281487 0.281457 0.000027 -0.5 0.9 2452 2692 2606 -0.98
    12YSZ031-12 2053 0.059430 0.001923 0.281543 0.281468 0.000018 -0.1 0.6 2449 2668 2586 -0.94
    12YSZ031-13 2053 0.050933 0.001590 0.281517 0.281455 0.000016 -0.6 0.6 2464 2697 2611 -0.95
    12YSZ031-14 2053 0.015522 0.000548 0.281519 0.281498 0.000010 0.9 0.4 2395 2603 2529 -0.98
    12YSZ031-16 2053 0.047364 0.001547 0.281555 0.281494 0.000011 0.8 0.4 2409 2611 2536 -0.95
    12YSZ031-17 2053 0.014949 0.000507 0.281501 0.281481 0.000008 0.3 0.3 2417 2640 2561 -0.98
    二长花岗片麻岩 (12XWK03)
    12XWK03-01 2098 0.041136 0.001278 0.281353 0.281302 0.000020 -5.0 0.7 2669 3000 2879 -0.96
    12XWK03-02 2098 0.072607 0.002298 0.281365 0.281274 0.000051 -6.0 1.8 2726 3063 2933 -0.93
    12XWK03-03 2098 0.059392 0.001697 0.281394 0.281326 0.000025 -4.1 0.9 2642 2948 2834 -0.95
    12XWK03-04 2098 0.062262 0.001884 0.281386 0.281311 0.000020 -4.7 0.7 2667 2982 2864 -0.94
    12XWK03-06 2098 0.048828 0.001484 0.281346 0.281287 0.000019 -5.5 0.7 2693 3033 2908 -0.96
    12XWK03-07 2098 0.043049 0.001330 0.281395 0.281342 0.000019 -3.6 0.7 2615 2915 2805 -0.96
    12XWK03-08 2098 0.051850 0.001573 0.281423 0.281360 0.000017 -2.9 0.6 2593 2874 2770 -0.95
    12XWK03-09 2098 0.065822 0.001815 0.281376 0.281303 0.000024 -5.0 0.9 2676 2999 2878 -0.95
    12XWK03-11 2098 0.022580 0.000708 0.281324 0.281296 0.000017 -5.2 0.6 2669 3015 2892 -0.98
    12XWK03-12 2098 0.037852 0.001223 0.281403 0.281354 0.000014 -3.2 0.5 2597 2888 2782 -0.96
    下载: 导出CSV
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  • 收稿日期:  2016-11-17
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