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    拉萨地块北部白垩纪多尼组火山岩的地球化学: 形成的构造环境

    康志强 许继峰 王保弟 董彦辉 王树庆 陈建林

    康志强, 许继峰, 王保弟, 董彦辉, 王树庆, 陈建林, 2009. 拉萨地块北部白垩纪多尼组火山岩的地球化学: 形成的构造环境. 地球科学, 34(1): 89-104.
    引用本文: 康志强, 许继峰, 王保弟, 董彦辉, 王树庆, 陈建林, 2009. 拉萨地块北部白垩纪多尼组火山岩的地球化学: 形成的构造环境. 地球科学, 34(1): 89-104.
    KANG Zhi-qiang, XU Ji-feng, WANG Bao-di, DONG Yan-hui, WANG Shu-qing, CHEN Jian-lin, 2009. Geochemistry of Cretaceous Volcanic Rocks of Duoni Formation in Northern Lhasa Block: Discussion of Tectonic Setting. Earth Science, 34(1): 89-104.
    Citation: KANG Zhi-qiang, XU Ji-feng, WANG Bao-di, DONG Yan-hui, WANG Shu-qing, CHEN Jian-lin, 2009. Geochemistry of Cretaceous Volcanic Rocks of Duoni Formation in Northern Lhasa Block: Discussion of Tectonic Setting. Earth Science, 34(1): 89-104.

    拉萨地块北部白垩纪多尼组火山岩的地球化学: 形成的构造环境

    基金项目: 

    国家重点基础研究973项目 40721063

    国家重点基础研究973项目 40425003

    国家重点基础研究973项目 9014001

    详细信息
      作者简介:

      康志强(1979 -), 男, 博士研究生, 主要从事岩石地球化学研究

      通讯作者:

      许继峰, E-mail: jifengxu@gig.ac.cn

    • 中图分类号: P591

    Geochemistry of Cretaceous Volcanic Rocks of Duoni Formation in Northern Lhasa Block: Discussion of Tectonic Setting

    • 摘要: 拉萨地块上广泛分布有中生代的岩浆活动, 研究它们对于认识特提斯构造域的演化和理解整个青藏高原的形成过程有着重要的启示.对出露于拉萨地块北部的白垩纪多尼组火山岩进行了系统的年代学以及元素地球化学研究, 达过和马跃乡地区的多尼组火山岩主体为酸性岩, 包括少量的玄武岩和玄武安山岩(中基性岩).火山岩的地球化学组成表明多尼组中基性岩具有高的Cr (平均为184×10-6) 和Ni (平均为43×10-6), 富集强不相容性元素Rb、Th、U, 而亏损Nb、Ta、Ti的特点, 显示明显的弧火山岩成分特征, 可能来源于具有较厚陆壳背境下的大陆边缘地幔楔的部分熔融; 而酸性岩具有相对高的SiO2、K2O、K2O/Na2O以及低的Mg# (最大值为32.4), 富集大离子亲石元素Rb、Ba以及Th、U、LREE等, 具有很高的Rb/Sr (1.06~4.47, 平均为2.73), 并且与拉萨地块南部林子宗群酸性火山岩具有非常相似的蛛网图曲线, 表明多尼组酸性岩与中基性岩可能来自不同的岩浆源区, 前者很可能来源于上覆地壳的部分熔融.通过对两个酸性岩样品中锆石的U-PbLA-ICPMS定年, 分别获得了116±1Ma和115±1Ma的年龄值, 显示多尼组火山岩形成于早白垩世中期.该地区多尼组火山岩形成的构造环境仍然存在两种可能性, 其一是新特提斯班公湖-怒江洋岩石圈向南俯冲导致了该火山岩的产生; 其二可能是早白垩世该地段的构造伸展作用导致加厚地壳的广泛部分熔融形成酸性火山岩, 并伴随陆下地幔的熔融事件产生的少量中基性火山岩.

       

    • 图  1  西藏南部冈底斯带晚侏罗世一早白垩世火山岩分布(据朱弟成等, 2006修改)

      SMLMF.沙莫勒一麦拉一洛巴堆一米拉山断裂; GLZCF.噶尔一隆格尔一扎日南木错一措麦断裂带; DMDF.达瓦错一马尔下一德庆断裂; SYNJF.狮泉河一永珠一纳木错一嘉黎断裂; BNS.班公湖一怒江缝合带; IYZS.印度河一雅鲁藏布江缝合带

      Fig.  1.  Distribution of the Late Jurassic-Early Cretaceous volcanic rocks on Gangdese, South Tibet

      图  2  达过地区地质略图(据1∶25万多巴区幅修改)(a)和马跃乡地区地质略图(据1∶25万尼玛区幅修改)(b)

      Fig.  2.  Simplified geological map of Daguo area (a) and simplified geological map of Mayuexiang area(b)

      图  3  多尼组样品06DN04和06DN14的锆石阴极发光图像

      Fig.  3.  CL images of analyzed zircons from sample 06DN04 and 06DN14 in Duoni Formation

      图  4  样品06DN04 (a) 和06DN14 (b) 的锆石U-Pb谐和图

      Fig.  4.  U-Pb Concordia diagrams for zircons separated from volcanic rock sample 06DN04 (a), 06DN14 (b) respectively

      图  5  多尼组火山岩TAS分类图解(林子宗群火山岩数据来源于Mo et al. (2007, 2008)

      Fig.  5.  TAS diagram of volcanic rocks in Duoni Formation

      图  6  多尼组火山岩的SiO2-K2O判别图解(a) 和Na2O-K2O判别图解(b) (数据来源同图 5)

      Fig.  6.  Diagrams of SiO2 vs K2O (a) and Na2O vs K2O (b) of volcanic rocks in Duoni Formation

      图  7  多尼组火山岩的哈克图解

      Fig.  7.  Harker variation diagrams for the volcanic rocks in Duoni Formation

      图  8  多尼组火山岩球粒陨石标准化稀土配分图

      Fig.  8.  Chondrite-normalized REE patterns for volcanic rocks in Duoni Formation

      图  9  多尼组中基性(a)和酸性(b)火山岩原始地幔标准化微量元素蛛网图

      新西兰Fgmont火山岩数据来源于Price et al., 1999; 阿根廷LJullallaco-Corrida de Cori area火山岩来源于Richards and Villeneuve(2002); 则弄群数据来源于康志强等, 2008; 林子宗火山岩数据来源于Mo et al. (2007, 2008)

      Fig.  9.  Primitive mantle-normalized spidergrams for intermediate-basic (a) and acid (b) volcanic rocks of Duoni Formation respetively

      图  10  多尼组基性火山岩的Th-Ta-Hf(a)(则弄群数据来源同图 9)和判别图解Th/Yb-Nb/Yb(b)(据Pearce and Peate(1995), 则弄群数据来源于朱弟成等, 2006)

      Fig.  10.  Th-Ta-Hf (a) and Th/Yb vs Nb/Yb(b) diagrams for mafic lavas of the volcanic rocks in Duoni Formation

      表  1  样品06DN04锆石LA-ICP-MS测年结果

      Table  1.   LA-ICPMS dating data of zircons in sample 06DNO4

      表  2  样品06DN14锆石LA-ICP-MS测年结果

      Table  2.   LA-ICP-MS dating data of zircons in sample 06DN14

      表  3  多尼组火山岩的主量(%).微量元素(10-6)分析测试结果

      Table  3.   Composition of major (%) and trace elements (10-6) for volcanic rocks of Duoni Formation

      表  4  多尼组中基性火山岩与其他地区中基性火山岩在微量元素(10-6) 的对比

      Table  4.   Comparison between trace elements (10-6) of basic volcanic rocks from Duoni Formation and from some else areas

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    • 收稿日期:  2008-10-21
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