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    集宁地区两类古元古代重熔花岗岩的锆石U-Pb年代学及岩石成因

    常青松 王惠初 施建荣 任云伟

    常青松, 王惠初, 施建荣, 任云伟, 2020. 集宁地区两类古元古代重熔花岗岩的锆石U-Pb年代学及岩石成因. 地球科学, 45(9): 3258-3267. doi: 10.3799/dqkx.2020.135
    引用本文: 常青松, 王惠初, 施建荣, 任云伟, 2020. 集宁地区两类古元古代重熔花岗岩的锆石U-Pb年代学及岩石成因. 地球科学, 45(9): 3258-3267. doi: 10.3799/dqkx.2020.135
    Chang Qingsong, Wang Huichu, Shi Jianrong, Ren Yunwei, 2020. Zircon U-Pb Chronology and Petrogenesis of Two Types of Remelting Granite in Jining Area. Earth Science, 45(9): 3258-3267. doi: 10.3799/dqkx.2020.135
    Citation: Chang Qingsong, Wang Huichu, Shi Jianrong, Ren Yunwei, 2020. Zircon U-Pb Chronology and Petrogenesis of Two Types of Remelting Granite in Jining Area. Earth Science, 45(9): 3258-3267. doi: 10.3799/dqkx.2020.135

    集宁地区两类古元古代重熔花岗岩的锆石U-Pb年代学及岩石成因

    doi: 10.3799/dqkx.2020.135
    基金项目: 

    中国地质调查局地质调查二级项目 DD20160042

    中国地质调查局地质调查二级项目 DD20190035

    详细信息
      作者简介:

      常青松(1985-), 男, 硕士, 工程师, 主要从事岩石学及地球化学研究.ORCID:0000-0003-1979-2012.E-mail:ga_8ief7@163.com

    • 中图分类号: P581

    Zircon U-Pb Chronology and Petrogenesis of Two Types of Remelting Granite in Jining Area

    • 摘要: 学术界对集宁-凉城地区的古元古代重熔型花岗岩成因一直持有不同的解释,本文对集宁土贵乌拉-隆盛庄一带两类重熔花岗岩进行了同位素年代学及地球化学研究.锆石LA-MC-ICP-MS U-Pb年代学结果显示,斑状石榴紫苏二长花岗质片麻岩具有1 954 Ma的侵位年龄及1 827 Ma的变质年龄,变质淡色石榴二长花岗岩具有1 956 Ma的侵位年龄.岩石地球化学特征显示斑状石榴紫苏二长花岗质片麻岩低硅、高镁铁,具有Eu负异常及Sr的相对亏损;变质淡色石榴二长花岗岩富硅、贫铁镁,强烈亏损Nb、Ta、Ti等高场强元素,富集K和Rb、Ba等亲石元素.二者形成时代相同,可能源自幔源岩浆底侵造成的重熔,斑状石榴紫苏二长花岗质片麻岩源岩为孔兹岩系沉积岩,混合了一定比例的幔源物质组分并经过分离结晶过程;变质淡色石榴二长花岗岩源岩主要为孔兹岩系沉积岩,较少受到幔源组分的影响.

       

    • 图  1  研究区地质简图

      a.大地构造简图,修改自Zhao et al.(2012);b.区域地质简图,修改自Guo et al.(2012);c.研究区地质简图

      Fig.  1.  Regional geological sketch map of study area

      图  2  野外露头及正交偏光显微照片

      a、b.斑状石榴紫苏花岗岩;c、d.淡色石榴二长花岗岩.图中:Pl.斜长石;Kfs.钾长石(条纹长石);Hy.紫苏辉石;Grt.石榴石

      Fig.  2.  Field outcrop photograph and cross-polarized photomicrograph

      图  3  锆石阴极发光(CL)图像

      虚线圆圈为变质年龄点位;实线圆圈为岩浆年龄点位

      Fig.  3.  Zircon cathode luminescence (CL) images

      图  4  锆石U-Pb谐和图

      Fig.  4.  Zircon U-Pb concordia diagrams

      图  5  岩浆岩TAS判别图解(a)及An-Ab-Or判别图解(b)

      Fig.  5.  TAS diagram (a) and An-Ab-Or diagram (b)

      图  6  球粒陨石标准化稀土配分图解(a)及原始地幔标准化微量元素蜘蛛图解(b)

      深灰色为斑状石榴紫苏花岗岩;浅灰色为淡色石榴二长花岗岩

      Fig.  6.  CHUR normalized REE distribution diagrams (a) and primitive mantle normalized spider diagrams (b)

      图  7  SiO2-Al2O3协变图解(a)及La/Sm-La图解(b)

      Fig.  7.  SiO2-Al2O3 diagram (a) and La/Sm-La diagram (b)

      图  8  CaO/Na2O-Al2O3/TiO2图解(a)及Rb/Ba-Rb/Sr判别图解(b)(据Sylvester,1998

      Fig.  8.  CaO/Na2O-Al2O3/TiO2 diagram (a) and Rb/Ba-Rb/Sr diagram (b) (after Sylvester, 1998)

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