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    基底岩系和花岗岩类Pb-Nd同位素组成限制祁连山带的构造属性

    张宏飞 靳兰兰 张利 袁洪林 周炼 张本仁

    张宏飞, 靳兰兰, 张利, 袁洪林, 周炼, 张本仁, 2006. 基底岩系和花岗岩类Pb-Nd同位素组成限制祁连山带的构造属性. 地球科学, 31(1): 57-65.
    引用本文: 张宏飞, 靳兰兰, 张利, 袁洪林, 周炼, 张本仁, 2006. 基底岩系和花岗岩类Pb-Nd同位素组成限制祁连山带的构造属性. 地球科学, 31(1): 57-65.
    ZHANG Hong-fei, JIN Lan-lan, ZHANG Li, YUAN Hong-lin, ZHOU Lian, ZHANG Ben-ren, 2006. Pb and Nd Isotopic Compositions of Basement and Granitoid in the Qilianshan: Constraints on Tectonic Affinity. Earth Science, 31(1): 57-65.
    Citation: ZHANG Hong-fei, JIN Lan-lan, ZHANG Li, YUAN Hong-lin, ZHOU Lian, ZHANG Ben-ren, 2006. Pb and Nd Isotopic Compositions of Basement and Granitoid in the Qilianshan: Constraints on Tectonic Affinity. Earth Science, 31(1): 57-65.

    基底岩系和花岗岩类Pb-Nd同位素组成限制祁连山带的构造属性

    基金项目: 

    国家自然科学基金重点项目 40234052

    详细信息
      作者简介:

      张宏飞(1962-), 男, 教授, 博士生导师, 主要从事造山带地球化学研究.E-mail: hfzhang@cug.edu.cn

    • 中图分类号: P59

    Pb and Nd Isotopic Compositions of Basement and Granitoid in the Qilianshan: Constraints on Tectonic Affinity

    • 摘要: 对扬子陆块的西北部边界至今尚未得到有效的限定.中央山系西段祁连山带基底岩系和花岗岩类的Pb-Nd同位素组成为限定扬子陆块的西北边界提供限制.祁连山带前寒武纪基底岩系的Nd同位素亏损地幔模式年龄(TDM)主要分布于0.75-2.5 Ga之间, 峰值为2.1 Ga左右; 该带古生代花岗岩类的TDM变化于1.07-2.14 Ga之间.由此表明, 祁连山带地壳增长主要发生于元古宙, 缺乏太古宙地壳增长的信息.祁连山带前寒武纪基底和花岗岩类全岩均以高放射成因的铅同位素组成为特征, 极大多数样品的206Pb/204Pb > 18.0, 207Pb/204Pb > 15.5, 208Pb/204Pb > 38.0.因此, 祁连山带地壳增长特征和铅同位素组成特征与华北陆块存在明显的差异, 而与扬子陆块一致, 从而表明祁连山带具有扬子型陆块的构造属性.因此, 扬子陆块的西北部边界扩大至祁连山带的北侧.自新元古代以来, 祁连山带经历了岩石圈裂解作用, 并有洋盆形成, 但这些构造事件均发生在扬子型陆块内部的地质背景.

       

    • 图  1  祁连山带构造简图

      1.前寒武基底岩系采样位置; 2.花岗岩类采样位置; 内插图示研究区在中国的大地构造位置

      Fig.  1.  Simplified tectonic map of Qilianshan belt

      图  2  Nd同位素模式年龄(TDM)分布直方图

      Fig.  2.  Histogram of Nd isotope model age (TDM)distribution

      图  3  207 Pb/204 Pb分布直方图

      a.华北陆块中生代花岗岩(张理刚, 1995); b.扬子陆块中生代花岗岩(张理刚, 1995); c.祁连山花岗岩类(数据见表 4); d.祁连山前寒武基底(数据见表 3)

      Fig.  3.  Histogram of207Pb/204 Pb distribution

      表  1  祁连山带前寒武纪变质岩系Nd同位素资料

      Table  1.   Whole-rock Nd isotope data of Precambrian basement from Qilianshan belt

      表  2  祁连山带古生代和中生代花岗岩类Nd同位素资料

      Table  2.   Whole-rock Nd isotope data of Paleozoic and Mesozoic granitoid from Qilianshan belt

      表  3  祁连山带前寒武纪变质岩系全岩Pb同位素资料

      Table  3.   Whole-rock Pb isotope data of Precambrian basement from Qilianshan belt

      表  4  祁连山带古生代和中生代花岗岩类全岩Pb同位素资料

      Table  4.   Whole-rock Pb isotope data of graniroid from Qilianshan belt

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    • 收稿日期:  2005-09-23
    • 刊出日期:  2006-01-25

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