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大兴安岭十八站—韩家园地区中酸性侵入岩LA-ICP-MS锆石U-Pb年龄、地球化学特征及其地质意义

更新时间:2016-07-05

研究区位于兴蒙造山带东段,大兴安岭北部塔河县十八站、呼玛县韩家园地区。大地构造演化史上,东北地区受到古(—中)生代古亚洲构造域与中—新生代蒙古—鄂霍茨克构造域和环太平洋构造域叠加作用的影响(刘建明等,2004;李锦轶等,2004;Wu Fuyuan et al.,2011;陈衍景等,2012;佘宏全等,2012),在区域内形成了一系列具有幔源岩浆特征的古生代岩体(周长勇等,2005a;张彦龙等,2010;冯志强等,2014)和与蒙古—鄂霍茨克洋闭合造山后伸展环境有关的晚中生代火山岩(赵书跃等,2004;张连昌等,2007;张玉涛等,2007;尹志刚等,2013;杨华本等,2016)。关于这些侵入岩体及火山岩,前人从岩石学、地球化学、同位素地球化学的角度进行了详细研究,并对其时空分布及其与大地构造背景之间的关系进行了深入探讨(Wu Fuyuan et al.,2000;佘宏全等,2012;许文良等,2013;孟凡超等,2014;张兴洲等,2015;邓晋福等,2015a)。不同学者,从区域成矿作用、成矿系列、成矿规律等(赵一鸣和张德全,1997;吕志成等,2000;刘建明等,2004;武广等,2014;马玉波等,2016)以及大地构造的角度展开过深入研究(李锦轶等,2004;张兴洲等,2012;2015;刘勃然等,2016)。

然而,关于不同时期区域构造体制开始与结束的时间及其影响范围一直存在较大争议,尤其是古亚洲洋闭合的时间(晚二叠世末—三叠纪初:黄汲清和陈炳蔚,1987;刘建明等,2004;中三叠世:孙德有等,2004;李锦轶等,2007;许文良等,2013)、蒙古—鄂霍茨克洋闭合的时间及俯冲方向(三叠纪—晚侏罗世:Zonenshain et al.,1990;Sengor and Natalin,1996;Sorokin et al.,2004;早—中侏罗世:Zorin,1999;Tomurtogoo et al.,2005;Kelty et al.,2008;晚侏罗世—早白垩世:Zhao Xixi et al.,1990;Kravchinsky et al.,2002;Metelkin et al.,2010;Sorokin et al.,2010;向北俯冲:Voo et al.,1999;Zorin,1999;Meng Qingren,2003;向南俯冲:Badarch et al.,2002;Wu Fuyuan et al.,2011;佘宏全等,2012;双向俯冲:Tomurtogoo et al.,2005;张玉涛等,2008)、环太平洋构造域开始的时间及其影响范围(晚三叠世:彭玉鲸和陈跃军,2007;早—中侏罗世:裴福萍等,2009;Xu Wenliang et al.,2009;Wu Fuyuan et al.,2011;张连昌等,2010;晚侏罗世160~155 Ma:赵越等,1994;吕斌等,2017),这些重要学术争议制约着对区域成岩成矿作用的准确认识,同时,也亟待后续研究工作进一步完善。

第三,体制、机制构建及部门间协调存在问题。未成年人保护及犯罪预防的职能分散于多个部门(公检法司、教育、劳动与社会保障、民政、共青团、妇联等),而各个部门都同时承担其他众多工作,条块分割,欠缺协调机制,未能整合资源形成联动机制,发挥各方面资源优势。目前各个专门机构之间的协调存在较多问题。首先是公检法司内部没有进行职能整合,涉及到未成年人保护的工作过于分散,还没有组建、整合出专门机构。而民政、卫生、共青团、妇联等政府专门机构都涉及到未成年人保护问题,没有在前期建立协调机制,遇到问题后便很难再整合。目前还存在部门间权责边界不清晰的问题。

从图1可看出,常温下暂堵压井胶塞的黏度随着时间的延长而增大,但在1 h内的黏度可控制在36 mPa·s内,保持可流动状态。表明其常温下的缓交时间达1 h以上,解决了现场高黏物质泵注困难或稠化剂与交联剂需交替注入带来的工艺复杂等问题。

为测试用户操作软件的性能,在泳池环境下进行测试。图5是泳池环境下的ROV,图6是自动检测界面,图7是主操作界面。

以江苏省为例,验证上述配置模型的科学性与实用性,数据选自《江苏卫生计生年鉴》(2017年)、《江苏统计年鉴》(2017年)。

图1 东北地区构造分区(a)及大兴安岭北部地质图(b) Fig.1 Tectonic subdivision of northeastern China(a)and geological map of the northern Great Hinggan Mts. (a)据Wu Fuyuan et al.,2011,许文良等,2013,修改;(b)据曾国平等,2016,武广等,2014,修改 (a)modified after Wu Fuyuan et al.,2011 and Xu Wenliang et al.,2013&;(b)modified after Zeng Guoping et al.,2016&and Wu Guang et al.,2014&

基于黑龙江省大力开展区域地质矿产调查这一背景,笔者选取十八站—韩家园地区中酸性侵入岩作为研究对象,基于1∶5万区域地质矿产调查中宏观观察和微观分析,较为详细地介绍了本区中酸性岩体的岩石学、地球化学和年代学特征,初步探讨了岩浆来源及成岩构造背景,以期为后续矿产勘查与区域研究工作提供参考依据。

反不正当竞争法的商业标识保护制度之评析.........................................................................王太平 袁振宗 05.03

1 地质背景与岩相学特征

研究区大地构造位置处于天山—兴蒙造山带东段大兴安岭构造岩浆弧北端,位于黑龙江省大地构造单元分区的额尔古纳地块东北部(图1a)。区域构造演化复杂而漫长,先后经历了古元古代基底形成、新元古代陆壳生长、新元古代末期板块裂解,古生代期间古陆块间的俯冲、拉张、拼贴碰撞,早中生代碰撞造山、晚中生代造山后伸展垮塌、大陆边缘弧后伸展等演化过程(佘宏全等,2012)。

大兴安岭北部地层出露较为齐全。从前寒武纪到古生代、中生代、新生代地层均有出露(图1b)。主要包括元古宇兴华渡口群、落马湖群和佳疙瘩组(Wu Guang et al.,2012)、寒武系额尔古纳河组和兴隆群、奥陶系和志留系海相碎屑岩、基性—中酸性火山岩和碳酸盐岩建造、泥盆系海相碎屑岩—碳酸盐岩、石炭系碳酸盐岩建造、二叠系海相、滨海相中—酸性火山岩和碎屑岩、三叠系陆相砾岩、砂岩和凝灰岩、侏罗系陆相碎屑岩、基性—中酸性火山岩、白垩系中酸性火山岩和碎屑岩(武广等,2014)。工作区地层出露相对简单,主要包括中元古界兴华渡口群和新生界第四系。兴华渡口群为本区古老基底,零星分布,局部被第四系覆盖,岩性见有云母片岩、石英片岩、斜长角闪岩、斜长片麻岩、变粒岩和浅粒岩等。第四系松散堆积物主要分布于呼玛河河谷及两侧阶地,多为砂、砾石及粘土。

从格律上看,44字的《卜算子》句式为5575,5575。从平仄看,◎仄◎平平,◎仄◎平仄(注:◎表示可平可仄)。与五言诗格律相仿。从起句方式看,多用对偶句。从表达功能上看,有“情起”式、“景起”式、“事起”式。

图2 大兴安岭十八站—韩家园地区岩体显微照片 Fig.2 Micrographs of intrusions from Shibazhan—Hanjiayuan,Great Hinggan Mts. Pl—斜长石;Kfs—钾长石;Hbl—角闪石;Bt—黑云母;Qtz—石英 Pl—plagioclase;Kfs—potassium feldspar;Hbl—hornblende;Bt—biotite;Qtz—quartz

区域构造以断裂为主体,主要发育北东向和北北东向断裂,其次为北西向和北北西向。总体上,自北东向南西依次分布有塔源—漠河断裂(F1)、得尔布干断裂(F2)、头道桥—鄂伦春断裂(F3)、二连—贺根山—黑河断裂(F4)、嫩江断裂(F5)、塔溪—林口断裂(F6)6条主干断裂。

大兴安岭北部岩浆活动强烈,包括新元古代、兴凯—萨拉伊尔期、加里东期、华力西期、印支期和燕山期岩浆岩(武广等,2014)。工作区发育古生代侵入岩和中生代火山岩。古生代侵入岩在工作区内大面积出露,包括闪长岩、花岗闪长岩、二长花岗岩和正长花岗岩等。区内同时发育花岗斑岩和石英斑岩等。中生代火山岩包括玄武岩、玄武安山岩、安山岩、粗面安山岩、粗面岩和流纹岩及中酸性火山碎屑岩等,其中,基性玄武岩出露面积较小,主要见于新村幅北东部,中酸性火山岩分布于十七站幅西南部。主要岩性特征分述如下:

稀土元素La/Sm值不易受到岩浆结晶分异作用的影响,能够判断岩浆是否受到地壳物质的混染(张作衡等,2006)。La/Sm>4.5被认为是受到地壳混染(Lassiter and DePaolo,1997)。本文测试数据显示,侵入岩La/Sm平均值为6.79,暗示岩浆底侵过程中受到地壳物质的混染。与原始地幔、下地壳、中地壳和上地壳Th/Nb值(分别为0.14,0.24,0.76和0.89,Rollison,2000)相比,二长闪长岩(平均值0.31)、二长花岗岩(平均值0.76)分别具有中—下地壳和中地壳物质组成的特征,表明岩浆在侵入过程中与地壳不同层位物质发生混染,亦不排除地壳部分熔融的可能性。

对1件二长闪长岩样品进行锆石U-Pb同位素测年分析。样品加工及锆石分选在河北省廊坊市宇能矿物分选公司实验室进行,采用常规粉碎和电磁选方法进行分选,然后将分离出的锆石在双目镜下挑出无裂隙、透明颗粒以环氧树脂固定,制成锆石样品靶,制靶由北京凯德正科技有限公司完成。锆石经抛光后进行光学和阴极发光图像(CL)观察,以备分析测试。LA-ICP-MS U-Pb年龄测试在中国科学院地质与地球物理研究所多接收等离子质谱仪实验室完成,分析仪器为配有193nm ArF准分子激光剥蚀系统的Agilent 7500a型四极杆电感耦合等离子体质谱仪(Q-ICPMS),U-Pb同位素分馏以国际标准锆石91500作为外部校正,以GJ作为辅助标样。锆石U-Pb同位素比值由ICP-MS测定,比值采用GLITTER(ver.4.4,Macquarie University)程序,依据Andersen(2002)的方法对所有数据进行普通铅校正,年龄计算及谐和图绘制采用Isoplot 3.0。详细分析原理及方法见谢烈文等(2008)和孙金凤等(2012)。

二长花岗岩:灰白色—浅肉红色,中细粒花岗结构,块状构造,主要矿物成分由石英30%~35%、碱性长石30%~35%、斜长石25%~30%、黑云母~5%等组成。石英,他形粒状,无色透明,正低突起,一级灰白至一级黄白干涉色,粒径0.2~1.5 mm;钾长石,他形板状,负低突起,简单双晶,局部可见卡式双晶,粒径0.4~2.5 mm;斜长石,半自形板柱状,正低突起,干涉色一级灰白,聚片双晶,粒度0.2~2.5 mm;黑云母,褐色,片状,一组解理,平行消光,干涉色鲜艳,粒径0.1~1.5 mm。副矿物为锆石,磷灰石和榍石等(图2c、d)。

2 样品分析方法

本次研究的样品采自黑龙江省1∶5万矿调分幅中的十七站幅和新村幅,共5件。选取1件二长闪长岩样品(北纬52°10′18″;东经125°32′38″)进行锆石U-Pb年龄测定,5件样品进行主量、微量元素分析。

图3 大兴安岭十八站—韩家园地区二长闪长岩锆石阴极发光照片 Fig.3 CL images of zircons from monzodiorite in Shibazhan—Hanjiayuan area,Great Hinggan Mts.

宪法文本上确立了住宅不受侵犯权作为公民的基本权利之一。住宅不受侵犯权在学术界又被称为“住宅自由”、“住宅安全”、“住宅安全权”,那么,学术界对住宅不受侵犯权的涵义又是怎么界定的呢?

岩浆岩的化学成分可有效判别岩浆的起源和其形成构造环境。高场强元素Nb、Ta、Zr、Hf、Th以及HREE不易受后期热液蚀变和低于角闪石相变质作用的影响,是判别成岩环境和探讨源区特征的有效探针。岩石微量元素中富集K、Rb、Ba、Sr等大离子亲石元素(LILE),亏损Nb、Ta、Ti等高场强元素(HFSE)通常被认为具有俯冲(消减)带幔源岩石地球化学特征(Ionov and Hofmann,1995;Kepppler,1996;汪岩等,2013;李佐臣等,2013;田亚洲等,2014),被解释为与俯冲板片派生的富水流体交代地幔楔有关(Ringwood,1990;张连昌等,2007;张贵山等,2009)。此外,典型的Nb、Ta和Ti亏损是判别岛弧构造环境的重要标志之一(Ringwood,1900;Ionov and Hofmann,1995;赵振华,2007;田亚洲等,2014)。分析结果表明,二长闪长岩和二长花岗岩均具有明显富集大离子亲石元素Ba、Sr,显著亏损高场强元素Nb、Ta和Ti的特征(图7),暗示本区中酸性侵入岩可能形成于俯冲带或岛弧环境。此外,样品的La/Nb平均值为2.92(>1.4,Condie,1999),指示其接近于弧环境。

3 分析结果

3.1 锆石U-Pb同位素年龄

表1 大兴安岭十八站—韩家园地区二长闪长岩LA-ICP-MS锆石U-Pb年龄测定结果 Table 1 LA-ICP-MS zircon U-Pb date of monzodiorite in Shibazhan—Hanjiayuan area,Great Hinggan Mts.

测点号元素含量(×10-6)PbThUTh/U同位素比值同位素年龄(Ma)n(207Pb)n(206Pb)n(207Pb)n(235U)n(206Pb)n(238U)n(207Pb)n(206Pb)n(207Pb)n(235U)n(206Pb)n(238U)测值±1σ测值±1σ测值±1σ测值±1σ测值±1σ测值±1σTW2-015.89 31.61 63.99 0.49 0.0614 0.0020 0.7039 0.0229 0.0832 0.0013 65243541145158TW2-029.63 74.72 96.31 0.78 0.0565 0.0017 0.6554 0.0194 0.0841 0.0013 47439512125208TW2-038.29 61.51 86.49 0.71 0.0604 0.0019 0.6772 0.0206 0.0814 0.0013 61739525125048TW2-0411.42 106.07 108.35 0.98 0.0588 0.0017 0.6909 0.0198 0.0852 0.0013 56037533125278TW2-057.48 55.33 79.75 0.69 0.0591 0.0019 0.6511 0.0210 0.0799 0.0013 57243509134958TW2-065.88 32.14 64.33 0.50 0.0570 0.0021 0.6461 0.0230 0.0822 0.0014 49350506145098TW2-0713.09 123.58 128.62 0.96 0.0592 0.0017 0.6736 0.0191 0.0826 0.0013 57436523125117TW2-086.18 32.16 68.05 0.47 0.0567 0.0022 0.6441 0.0239 0.0824 0.0014 48052505155108TW2-095.74 35.42 61.46 0.58 0.0552 0.0025 0.6357 0.0275 0.0835 0.0015 42265500175179TW2-106.30 37.53 67.33 0.56 0.0569 0.0026 0.6519 0.0286 0.0831 0.0015 48865510185149TW2-116.46 50.72 66.05 0.77 0.0583 0.0041 0.6647 0.0465 0.0827 0.0016 5411195182851210TW2-127.50 52.64 78.33 0.67 0.0588 0.0029 0.6677 0.0321 0.0824 0.0015 55873519205109TW2-136.18 48.66 62.69 0.78 0.0582 0.0027 0.6644 0.0302 0.0828 0.0016 53767517185139TW2-1419.78 235.13 182.27 1.29 0.0577 0.0022 0.6599 0.0245 0.0829 0.0013 51954515155138TW2-156.40 43.11 67.01 0.64 0.0579 0.0031 0.6636 0.0348 0.0831 0.0016 52682517215159TW2-167.13 47.98 74.90 0.64 0.0577 0.0029 0.6574 0.0325 0.0827 0.0015 51777513205129TW2-177.24 55.00 73.04 0.75 0.0580 0.0032 0.6645 0.0353 0.0831 0.0016 53083517225149TW2-187.46 60.12 75.73 0.79 0.0581 0.0028 0.6632 0.0313 0.0828 0.0015 53271517195139TW2-195.68 30.45 63.10 0.48 0.0575 0.0038 0.6557 0.0416 0.0827 0.0018 5121015122551211TW2-205.41 35.29 58.50 0.60 0.0576 0.0033 0.6561 0.0362 0.0826 0.0017 513855122251210TW2-215.81 29.75 64.07 0.46 0.0575 0.0030 0.6563 0.0332 0.0827 0.0016 51278512205129TW2-224.89 33.98 51.99 0.65 0.0580 0.0053 0.6603 0.0594 0.0826 0.0017 5291635153651210TW2-236.52 43.79 68.93 0.64 0.0576 0.0028 0.6587 0.0316 0.0829 0.0016 51572514195149TW2-2415.79 124.73 161.10 0.77 0.0579 0.0022 0.6626 0.0243 0.0831 0.0014 52551516155148

本次研究从二长闪长岩中挑选出24颗锆石进行U-Pb同位素测定,测试结果列于表1中。阴极发光图像显示(图3),闪长岩中锆石多呈自形长柱状,少部分呈短柱状,长宽比介于1∶1~5∶1之间。样品Th、U含量分别为29.75×10-6~235.13×10-6和51.99×10-6~182.27×10-6,Th/U值变化于0.46~1.29(岩浆锆石Th/U值大于0.4)。24颗锆石的206Pb/238U年龄值较为稳定,介于495~527 Ma,在U -Pb谐和图上(图4),集中落于谐和线及其附近,交点年龄为514.5±5.4 Ma(MSWD=0.31),206Pb/238U加权平均年龄为512.4±3.5 Ma(MSWD=0.48),表明二长闪长岩形成于早—中寒武世,代表了早古生代岩浆活动的产物。

3.2 岩石地球化学特征

3.2.1 主量元素

前人研究表明,原始地幔Nb/Ta值为15.5~19.5(Jochum,1989),Zr/Hf平均值为34.27~38.27(Stolz,1996)。本区中酸性侵入岩Nb/Ta平均值为18.86,接近原始地幔,同时远高于正常花岗岩和大陆地壳平均值(约11,Green,1995),Zr/Hf平均值27.25介于原始地幔(36.27,Stolz,1996)和大陆地壳(11.00,Stolz,1996)之间。地球化学证据显示本区成岩岩浆具有一定的地幔亲源性。Hf同位素证据显示,二长闪长岩锆石εHf(t)值>0 (0.6~5.5,未发表),指示形成闪长岩的岩浆源区具有亏损地幔特征。

5件侵入岩样品主量元素测试结果列于表2中。分析结果显示,二长闪长岩SiO2含量53.19%~55.39%,Al2O3 19.38%~20.55%,Fe2O3T 6.28%~7.76%,CaO 7.96%~8.06%,MgO 2.25%~2.30%,K2O 0.61%~0.99%,Na2O 4.73%~5.97%,组合指数σ=2.57~4.07,铝饱和指数A/CNK=0.77~0.88,属于准铝质碱性—钙碱性岩石系列。

二长花岗岩SiO2含量67.86%~72.97%,Al2O3 14.87%~16.06%,Fe2O3T 1.47%~3.04%,CaO 2.38%~2.99%,MgO 0.52%~1.25%,K2O 2.90%~3.38%,Na2O 4.12%~4.39%,组合指数σ=1.64~2.26,铝饱和指数A/CNK=0.99~1.04,属于准铝质—弱过铝质钙碱性岩石系列。

图4 大兴安岭十八站—韩家园地区二长闪长岩锆石U-Pb年龄谐和图 Fig.4 Zircon U-Pb concordia diagram of monzodiorite in Shibazhan—Hanjiayuan area,Great Hinggan Mts.

分析结果经去烧失量和100%换算后,选取火成岩TAS分类图解进行投图(图略),除一件样品落入碱性系列区域,其它样品均属于亚碱性系列。样品分析结果经对Fe2O3T换算(参照邓晋福等,2015b)后进行CIPW标准矿物计算,应用花岗岩类实际矿物Q—A—P图解进行投图(图5a),样品投影点分别落入二长闪长岩和花岗岩(二长花岗岩)区域。在岩石系列SiO2—K2O判别图解中(图5b),5件侵入岩样品落入钙碱性—高钾钙碱性岩石系列区域。在岩石铝饱和度判别图解中(图5c),样品投影点主要落入准铝质到弱过铝质区域,A/CNK值多数小于1.0(SXT23样品为1.04),同时落入Chappell and White(1992)划分的I型花岗岩范围。在花岗岩成因类型判别图解上(图5d),样品落入I型花岗岩区域,二长闪长岩的低钾高钠特征更为显著。

表2 大兴安岭十八站—韩家园地区岩体主量元素组成(%) Table 2 Major elements compositions of intrusions in Shibazhan—Hanjiayuan area,Great Hinggan Mts(%)

样品编号岩性名称SiO2TiO2Al2O3Fe2O3FeOCaOMgOMnOK2ONa2OP2O5烧失总量σA/CNKA/NKSXT29二长闪长岩55.390.6120.552.103.767.962.250.0670.994.730.330.8299.562.570.882.32SXT253.191.1919.382.734.528.062.300.0780.615.970.401.0399.464.070.771.85SXT15二长花岗岩68.870.3716.061.021.322.910.890.0413.384.280.150.5299.812.261.001.50SXT2372.970.1814.870.590.802.380.520.0212.904.120.040.5299.911.641.041.50SXT3067.860.3915.941.221.632.991.250.0583.104.390.160.7999.782.241.001.51

3.2.2 稀土和微量元素

岛弧和活动大陆边缘环境产出的花岗岩一般为钙碱性或高钾钙碱性花岗岩,常见的岩石组合有石英闪长岩、二长闪长岩、花岗闪长岩和花岗岩,常与同期的安山岩、玄武岩伴生,该类型花岗岩多属于I型花岗岩类(常丽华等,2015)。本文研究的中酸性侵入岩,二长闪长岩富含角闪石,二长闪长岩和二长花岗岩均含有一定量黑云母,在K2O—Na2O图解中落入I型花岗岩范围,岩石整体上属于钙碱性到高钾钙碱性岩石系列,且区域内产出同时期玄武岩(汪岩等,2017),结合岩石组合、矿物成分与成因系列等多方面证据,认为本区岩体形成于活动大陆边缘弧或岛弧环境。

图5大兴安岭十八站—韩家园地区岩体地球化学图解 (a)QAP图解;(b)SiO2—K2O图解;(c)A/NK— A/CNK图解;(d)K2O—Na2O图解 Fig.5 Geochemical diagrams of intrusions in Shibazhan—Hanjiayuan area,Great Hinggan Mts. (a)QAP diagram;(b)SiO2 vs.K2O diagram;(c)A/NK vs.A/CNK diagram;(d)K2O vs.Na2O diagram

4 讨论

4.1 成岩环境

对5件侵入岩样品进行主、微量分析。野外采集的样品首先在显微镜下进行薄片鉴定,然后经去风化壳—机械粉碎—研磨(200目)等程序后备分析测试。主、微量分析由核工业北京地质研究院分析测试中心完成。其中,主量元素在PW2404型荧光光谱仪(XRF)上进行,测试流程参照国家标准GB/T14506.14-2010,分析结果相对误差小于5%;微量元素分析采用ELEMENT XR型电感耦合等离子质谱仪(ICP-MS)完成,测试流程参照国家标准GB/T14506.30-2010,分析结果相对误差小于10%。详细分析方法、分析精度见Liu Yongsheng et al.(2008)。

2)评审子系统。项目评审工作是项目管理的重要环节,通过项目管理系统的评审子系统,可以实现对教改项目立项评审、中期检查评审、结题评审等在线评审功能;项目申报者提出各项申请后,校级管理者根据项目所属的专业及研究方向,从系统建立的评审专家库中找到相关专家,进行评审任务的分配。评审专家可以包含校内外、区内外的各个权威专家,通过专家评审意见的反馈,达到指导教师开展教改项目申报及研究的作用。同时,通过在线评审与会议评审相结合的模式,可以进一步提高项目评审的客观性和权威性,提高项目管理水平。

5件样品稀土和微量元素测试结果列于表3中。分析结果显示,侵入岩样品稀土元素总量∑REE=69.51×10-6~275.83×10-6,其中轻稀土总量∑LREE=66.58×10-6~246.33×10-6,重稀土总量∑HREE=2.93×10-6~29.50×10-6,轻稀土相对于重稀土显著富集,轻重稀土比值∑LREE/∑HREE=8.35~22.74,轻重稀土分馏相对明显,(La/Yb)N=9.11~26.64。Eu异常不显著(δEu=0.90~1.35)。在稀土元素配分图上(图6a)显示为轻稀土相对富集、重稀土相对平坦的右倾型。在原始地幔标准化微量元素蛛网图中(图6b),具有明显富集大离子亲石元素Ba、Sr,显著亏损高场强元素Nb、Ta、Ti的特征,二长闪长岩相对二长花岗岩亏损Zr。

表3 大兴安岭十八站—韩家园地区岩体微量元素组成(×10-6) Table 3 Trace elements compositions of intrusions in Shibazhan—Hanjiayuan area,Great Hinggan Mts.(×10-6)

样品编号岩性名称BaRbSrYZrNbThPbGaZnCuNiVCrSXT29二长闪长岩43820.713869.328.93.961.589.9423.261.220.109.22105.016.0SXT23419.1133239.879.418.604.122.6129.272.935.9022.30130.051.5SXT15二长花岗岩126558.36657.091.311.107.9623.3021.150.44.187.2237.424.4SXT2394664.24463.873.76.005.7724.3017.830.05.925.2417.711.3SXT30122563.276610.7140.012.107.4220.4020.445.84.177.0742.213.5样品编号岩性名称HfCsScTaCoLIBEUWMoLaCePrNdSXT29二长闪长岩1.272.787.930.1912.806.401.530.660.0960.25918.537.15.0820.0SXT23.265.0510.901.4012.109.842.510.940.1651.32047.0105.015.8063.0SXT15二长花岗岩3.201.173.140.814.0816.402.161.890.1620.28426.452.86.3820.7SXT232.670.822.380.191.974.852.191.130.1510.18913.240.42.478.5SXT304.241.074.570.835.939.931.841.760.2090.19234.254.87.0025.8样品编号岩性名称SmEuGdTbDyHoErTmYbLu∑REELREEHREELaYb()NδEuSXT29二长闪长岩3.801.222.900.4661.900.3690.9450.1310.7670.11393.29111.2917.301.080SXT212.203.339.651.6807.851.5204.0200.6003.7000.480275.8308.359.110.906SXT15二长花岗岩3.340.872.370.3481.430.2250.6390.1030.7140.088116.41118.6726.520.903SXT231.410.571.120.1480.700.1240.3470.0520.3760.06269.51222.7425.181.350SXT304.291.162.950.4381.940.3450.8770.1320.9210.137134.9916.4426.640.944

图6 大兴安岭十八站—韩家园地区岩体稀土元素球粒陨石标准化配分形式图(a)和微量元素地幔标准化蛛网图(b)(标准化数据引自Sun and McDonough,1989) Fig.6 Chondrite-normalized REE patterns(a)and trace elements primitive mantle-normalized spide diagram(b)of intrusions in Shibazhan—Hanjiayuan area,Great Hinggan Mts(Chondrite and primitive mantle values from Sun and McDonough,1989)

4.2 岩浆来源

“摸”、“取”、“摸”仅三个动词就把鲁达的慷慨豪爽、史进的坦诚爽快、李忠的精细小气淋漓尽致地展现在读者面前。名著就是这样,只要细读品味,语言的珍珠随处可见,名著的魅力也就显现了出来。

图7 大兴安岭十八站—韩家园地区侵入体成岩构造背景判别图解:(a)Rb/30—3Ta—Hf图解;(b)(Y+Nb)—Rb图解;(c)SiO2—FeOT/(FeOT+ MgO)图解;(d)R1—R2图解 Fig.7 Genetic setting diagrams of intrusions in Shibazhan—Hanjiayuan area,Great Hinggan Mts:(a)Rb/30 vs.3Ta vs.Hf diagram;(b)(Y+Nb)vs.Rb diagram;(c)SiO2 vs.FeOT/(FeOT+ MgO)diagram;(d)R1 vs.R2 diagram

二长闪长岩:深灰—灰黑色,中细粒粒状结构,块状构造,主要矿物成分由斜长石50%~55%、钾长石15%~20%、石英1%~5%、角闪石10%~15%、黑云母5%~10%组成。石英,他形粒状,粒径0.2~1.5 mm;斜长石,半自形—自形柱状、板状,斜消光,聚片双晶,粒径0.3~2.5 mm;钾长石,他形板状,简单双晶,粒径1.0~2.5 mm;黑云母,片状,粒径0.5~1.0 mm;角闪石,半自形菱柱状,角闪石式解理,粒径0.1~0.2 mm。副矿物为锆石,磷灰石和榍石等(图2a、b)。

4.3 地质意义

应用主微量特征元素判别图解对成岩构造背景进行示踪。在Rb/30—Hf—3Ta判别图上(图7a),样品投影点主要落入火山弧区域,个别样品落入板内环境。在(Y+Nb)—Rb判别图中(图7b),投影点主要落入火山弧花岗岩区。在SiO2—FeOT/(FeOT+ MgO)判别图解上(图7c),二长花岗岩落于岛弧花岗岩+大陆弧花岗岩+大陆碰撞花岗岩区域。在R1—R2判别图解上(图7d),二长闪长岩落入破坏性活动板块边缘(板块碰撞前)花岗岩区和板块碰撞后隆起期花岗岩区外围,二长花岗岩主要落于碰撞后隆起期花岗岩或同碰撞花岗岩区内,二者与区域上洛古河石英闪长岩可良好类比(武广,2005)。综合分析认为,本区中酸性侵入岩形成于活动大陆边缘弧或岛弧环境,为碰撞造山作用不同阶段的产物,二长闪长岩记录了碰撞前破坏性活动板块边缘环境的信息,二长花岗岩则更多的留下了碰撞后造山隆起的印记。

一般认为,钙碱性岩浆起源于板块俯冲过程(程银行等,2012),通常将高钾钙碱性系列岩浆岩作为后碰撞岩浆活动的重要标志(Zhao X et al.,1996;Searle et al.,1997;赵振华,2007;朱志敏等,2011)。本文研究的二长闪长岩系钙碱性岩石系列,二长花岗岩属于钙碱性—高钾钙碱性系列,同样暗示它们形成于板块破坏到碰撞造山这一过程。

武广(2005)对漠河地区洛古河石英闪长岩和二长花岗岩进行锆石U-Pb年代学研究,分别获得了517±9 Ma和504±8 Ma的年龄,认为其形成于古亚洲洋闭合背景下萨拉伊尔碰撞造山运动的晚阶段(后碰撞花岗岩类),而472~467 Ma间A型花岗岩的出现标志着区域已进入板内环境;汪岩等(2017)对塔河县西北部瓦拉干林场一带中基性火山岩的U-Pb年代学研究,表明其形成于500.5±0.95 Ma,认为岩浆的形成与岛弧背景下拉张作用有关;葛文春(2005)获得塔河花岗岩体锆石U-Pb年龄为480~494 Ma;周长勇等(2005a)对塔河县东北部辉长岩的锆石U-Pb年代学研究,显示出484±15 Ma和477±10 Ma岩浆活动的信息;本文对塔河县十八站至呼玛县韩家园一带二长闪长岩进行锆石U-Pb年龄测定,其成岩年龄为512.4±3.5 Ma,成岩作用与板块俯冲碰撞相联系,虽然未能同时获得二长花岗岩的年龄,结合区域资料及本文研究,推测其形成时代应晚于二长闪长岩成岩年龄;周长勇等(2005b)对塔河辉长岩的地球化学研究表明,其形成可能与古亚洲洋闭合过程中板块俯冲—流体交代作用有关。

这些位于额尔古纳地块北缘,大致沿漠河—塔河断裂一线方向分布的寒武纪中基性到中酸性侵入岩以及中基性火山岩,并非偶然岩浆活动的产物,它们共同指示了早古生代区域内存在一次大规模的构造作用与岩浆活动,其应归属于古亚洲洋闭合机制下板(陆)块俯冲—碰撞—拉张作用的结果,即约510 Ma间萨拉伊尔运动的产物(吕斌等,2017)。萨拉伊尔运动除了形成一系列基性—中酸性侵入体和火山岩外,还形成了同时期(510~473 Ma)以多宝山、铜山为代表的斑岩型铜钼矿床(陈衍景等,2012;白令安等,2012;武广等,2014;吕斌等,2017)。考虑到古亚洲洋经历了形成—闭合—裂解—封闭等这一繁杂演化过程,本文将区域内早古生代古亚洲洋称之为“前古亚洲洋”,以同古亚洲洋在中—晚古生代期间的演化相区分。最近,冯志强(2015)认为位于额尔古纳与兴安地块之间的新林—喜桂图洋,大约在510 Ma完成洋盆闭合,于500 Ma左右进入后造山阶段,这关于区域上大地构造演化的认识与本文研究结论具有一致性。

5 结论

大兴安岭十八站—韩家园地区发育早古生代二长闪长岩、花岗闪长岩、二长花岗岩和碱长花岗岩。二长闪长岩属于准铝质、钙碱性系列,成岩年龄为512.4±3.5 Ma。二长花岗岩属于准铝质—弱过铝质、钙碱性—高钾钙碱性系列。二者形成于活动大陆边缘/岛弧环境,为前古亚洲洋闭合背景下萨拉伊尔造山运动不同阶段的产物。

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柴明春,赵国英,覃小锋,王泉,高溯,曹昆
《地质论评》 2018年第03期
《地质论评》2018年第03期文献

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