聂荣微陆块花岗片麻岩锆石LA-ICP-MS U-Pb定年--新元古代基底岩石的发现及其意义

王明, 李才, 解超明, 吴彦旺, 苏犁, 胡培远. 2012. 聂荣微陆块花岗片麻岩锆石LA-ICP-MS U-Pb定年--新元古代基底岩石的发现及其意义. 岩石学报, 28(12): 4101-4108.
引用本文: 王明, 李才, 解超明, 吴彦旺, 苏犁, 胡培远. 2012. 聂荣微陆块花岗片麻岩锆石LA-ICP-MS U-Pb定年--新元古代基底岩石的发现及其意义. 岩石学报, 28(12): 4101-4108.
WANG Ming, LI Cai, XIE ChaoMing, WU YanWang, SU Li, HU PeiYuan. 2012. LA-ICP-MS U-Pb dating of zircon from granitic gneiss of the Nierong microcontinent: The discovery of the Neoproterozoic basement rock and its significance. Acta Petrologica Sinica, 28(12): 4101-4108.
Citation: WANG Ming, LI Cai, XIE ChaoMing, WU YanWang, SU Li, HU PeiYuan. 2012. LA-ICP-MS U-Pb dating of zircon from granitic gneiss of the Nierong microcontinent: The discovery of the Neoproterozoic basement rock and its significance. Acta Petrologica Sinica, 28(12): 4101-4108.

聂荣微陆块花岗片麻岩锆石LA-ICP-MS U-Pb定年--新元古代基底岩石的发现及其意义

  • 基金项目:

    本文受国家自然基金项目(41072166、41272240)和中国地质调查局项目(1212011086064)联合资助.

详细信息
    作者简介:

    王明,男,1984年生,博士生,构造地质学专业,E-mail: wm609@163.com

    通讯作者: 李才,男,1953年生,教授,博士生导师,从事青藏高原大地构造与区域地质研究,E-mail: licai010@126.com
  • 中图分类号: P597.3

LA-ICP-MS U-Pb dating of zircon from granitic gneiss of the Nierong microcontinent: The discovery of the Neoproterozoic basement rock and its significance

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  • 聂荣微陆块呈透镜体状夹持在班公湖-怒江板块缝合带内,其上出露有黑云母花岗片麻岩以及二长花岗片麻岩等不同类型的古老片麻岩,本文报道产出于聂荣微陆块上花岗片麻岩的锆石LA-ICP-MS U-Pb定年结果,样品锆石的岩浆震荡环带十分发育,多数锆石具有典型的岩浆结晶锆石的特征。所有测点中有16个测点的Th/U值较高,介于0.58~1.24之间,平均值为0.79,获得的206Pb /238U年龄基本一致,加权平均值为819.6±5.2Ma,笔者等认为该年龄代表了花岗片麻岩的原岩结晶时代为新元古代。我们在羌塘南部地区的碎屑岩中获得了同样的年龄峰值(809Ma)。此外,我们认为年龄中具有507Ma左右的信息反映了泛非事件之后另外一次强烈构造热事件的影响在该区的存在。

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  • 图 1 

    藏北安多地区地质图(据解超明等,2010修改)

    Figure 1. 

    The geological map of Amdo area northern Tibet (after Xie et al., 2010)

    图 2 

    花岗片麻岩野外露头及显微照片

    Figure 2. 

    The out crop and photomicrographs of granitic gneiss

    图 3 

    花岗片麻岩(样品AD05b2) 锆石CL图像

    Figure 3. 

    CL images of zircons from granitic gneiss (sample AD05b2)

    图 4 

    花岗片麻岩(样品AD05b2) 锆石U-Pb谐和图

    Figure 4. 

    U-Pb concordia diagram of zircons from granitic gneiss (sample AD05b2)

    图 5 

    锆石稀土元素球粒陨石标准化配分模式(球粒陨石值据Sun and McDonough, 1989)

    Figure 5. 

    Chondrite-normalized REE patterns for the zircons (after Sun and McDonough, 1989)

    图 6 

    新元古代罗迪尼亚超大陆复原图(据Condie, 2001简化)

    Figure 6. 

    The reconstruction map of paleogeographic Rodinia (modified after Condie, 2001)

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出版历程
收稿日期:  2011-09-21
修回日期:  2012-11-19
刊出日期:  2012-12-01

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