新疆西准噶尔红山岩体及其中闪长质岩墙的时代--来自锆石LA-ICP-MS定年的证据

冯乾文, 李锦轶, 刘建峰, 张进, 曲军峰. 2012. 新疆西准噶尔红山岩体及其中闪长质岩墙的时代--来自锆石LA-ICP-MS定年的证据. 岩石学报, 28(9): 2935-2949.
引用本文: 冯乾文, 李锦轶, 刘建峰, 张进, 曲军峰. 2012. 新疆西准噶尔红山岩体及其中闪长质岩墙的时代--来自锆石LA-ICP-MS定年的证据. 岩石学报, 28(9): 2935-2949.
FENG QianWen, LI JinYi, LIU JianFeng, ZHANG Jin, QU JunFeng. 2012. Ages of the Hongshan granite and intruding dioritic dyke swarms, in western Junggar, Xinjiang, NW China: Evidence form LA-ICP-MS zircon chronology. Acta Petrologica Sinica, 28(9): 2935-2949.
Citation: FENG QianWen, LI JinYi, LIU JianFeng, ZHANG Jin, QU JunFeng. 2012. Ages of the Hongshan granite and intruding dioritic dyke swarms, in western Junggar, Xinjiang, NW China: Evidence form LA-ICP-MS zircon chronology. Acta Petrologica Sinica, 28(9): 2935-2949.

新疆西准噶尔红山岩体及其中闪长质岩墙的时代--来自锆石LA-ICP-MS定年的证据

  • 基金项目:

    本文受国家973项目(2007CB411306、2001CB409810)和国土资源大调查工作项目(1212010711817、1212010611806)联合资助

详细信息
    作者简介:

    冯乾文, 男, 1984年生, 博士生, 构造地质学专业, E-mail: fengqianwen1984@163.com

    通讯作者: 李锦轶, 男, 1956年生, 博士生导师, 研究员, 从事大地构造研究, E-mail: jyli@cags.net.cn
  • 中图分类号: P597.3; P583

Ages of the Hongshan granite and intruding dioritic dyke swarms, in western Junggar, Xinjiang, NW China: Evidence form LA-ICP-MS zircon chronology

More Information
  • 作为一种特殊产状的岩浆岩, 岩墙保存有岩浆活动和地球动力学背景等方面的重要信息。为了研究和探讨西准噶尔乃至中亚地区古生代晚期的地球动力学环境, 我们对西准噶尔地区侵入花岗岩的暗色岩墙开展了卫星遥感影像解译、地表地质调查和相关室内研究工作。研究发现, 新疆西准噶尔红山花岗岩体中发育大量环状和非环状闪长岩岩墙。环状岩墙从中心到外围, 岩墙宽度逐渐变窄, 矿物粒度也逐渐变细;非环状岩墙切割环状岩墙, 宽度和矿物粒度都没有明显变化。为了确定这些岩墙的形成时代, 对3个环状岩墙样品、2个非环状岩墙和1个花岗岩样品进行了锆石LA-ICP-MS U-Pb定年, 得到环状岩墙的年龄为:304±1Ma、302±1Ma、303±1Ma;非环状岩墙的年龄为:302±1Ma、302±1Ma;花岗岩的年龄为304±1Ma。结合不同类型岩墙及其与岩体的穿切关系, 确定红山岩体的形成时代为304Ma左右, 环状岩墙的形成时代为303Ma左右, 非环状岩墙的形成时代为302Ma左右。这一年代学研究成果揭示出西准噶尔地区在石炭纪末期发育不同类型的岩浆活动, 闪长质岩墙所占据的裂隙是在石炭纪末期形成的;为从岩浆活动和由这些岩墙所占据的裂隙研究, 探讨该区古生代晚期的地球动力学环境, 提供了有力的时间约束。

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  • 图 1 

    西准噶尔地区的位置和板块构造分区(a)和主要岩体、断裂以及红山岩体的位置(b)

    Figure 1. 

    Tectonic divisions of Central Asian area (after Li et al., 2006a) and location of western Junggar area (a) and plutons and faults of western Junggar area and location of the Hongshan granitic pluton (b)

    图 2 

    岩墙的分布情况和年代学样品采样位置

    Figure 2. 

    Distributing patterns of the dykes and chronological sample locations

    图 3 

    靠近环状岩墙中部岩墙和围岩的接触关系及岩浆混合

    Figure 3. 

    Contact relationships and magma mixture between the dykes and the host rock, near the centre of ring dykes

    图 4 

    岩墙和围岩的显微照片

    Figure 4. 

    Microscopic photos of dykes and host rock

    图 5 

    锆石阴极发光图像和测试点位置

    Figure 5. 

    CL images of zircons and analyzed points

    图 6 

    各样品锆石年龄的谐和图

    Figure 6. 

    U-Pb concordia diagrams of dykes and host rock

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出版历程
收稿日期:  2011-09-19
修回日期:  2011-12-02
刊出日期:  2012-09-01

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