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    松潘-甘孜造山带东缘塔公岩体岩石学、同位素年代学特征及其构造意义

    邓红 唐渊 骆志红 罗林洪 梁兵 贾志泉 李豪 刘祥

    邓红, 唐渊, 骆志红, 罗林洪, 梁兵, 贾志泉, 李豪, 刘祥, 2021. 松潘-甘孜造山带东缘塔公岩体岩石学、同位素年代学特征及其构造意义. 地球科学, 46(2): 527-539. doi: 10.3799/dqkx.2020.219
    引用本文: 邓红, 唐渊, 骆志红, 罗林洪, 梁兵, 贾志泉, 李豪, 刘祥, 2021. 松潘-甘孜造山带东缘塔公岩体岩石学、同位素年代学特征及其构造意义. 地球科学, 46(2): 527-539. doi: 10.3799/dqkx.2020.219
    Deng Hong, Tang Yuan, Luo Zhihong, Luo Linhong, Liang Bing, Jia Zhiquan, Li Hao, Liu Xiang, 2021. Petrology and Isotopic Chronology of Tagong Granite in Eastern Songpan-Ganzi Fold Belt and Its Tectonic Significance. Earth Science, 46(2): 527-539. doi: 10.3799/dqkx.2020.219
    Citation: Deng Hong, Tang Yuan, Luo Zhihong, Luo Linhong, Liang Bing, Jia Zhiquan, Li Hao, Liu Xiang, 2021. Petrology and Isotopic Chronology of Tagong Granite in Eastern Songpan-Ganzi Fold Belt and Its Tectonic Significance. Earth Science, 46(2): 527-539. doi: 10.3799/dqkx.2020.219

    松潘-甘孜造山带东缘塔公岩体岩石学、同位素年代学特征及其构造意义

    doi: 10.3799/dqkx.2020.219
    基金项目: 

    中国地质调查局项目 DD20190053

    中国地质调查局项目 DD20160021

    详细信息
      作者简介:

      邓红(1986-), 男, 工程师, 主要从事区域地质矿产调查和研究.ORCID: 0000-0003-3993-5359.E-mail: 676689076@qq.com

    • 中图分类号: P581

    Petrology and Isotopic Chronology of Tagong Granite in Eastern Songpan-Ganzi Fold Belt and Its Tectonic Significance

    • 摘要: 松潘-甘孜造山带东缘的三叠纪-侏罗纪中酸性花岗岩,如塔公岩体,为晚三叠世的碰撞造山以及燕山期的构造演化提供了重要信息.区域地质调查填图表明,塔公岩体为石英闪长岩、花岗闪长岩、黑云母二长花岗岩.其地球化学特征表明岩石主体属高钾钙碱性系列、准铝质-过铝质过渡系列,稀土配分曲线显示其轻稀土富集、重稀土亏损,具有壳源岩浆特征,稀土-微量元素投点结果表明花岗岩形成于造山时期后碰撞阶段.对塔公花岗岩体采集的4件同位素样品的年龄数据质量较高,为214±1 Ma、214±1 Ma、215±1 Ma、216±1 Ma;该组年龄可以作为限制印支晚期扬子、华北和昌都板块之间碰撞时限的证据.基于塔公花岗岩类的岩石地球化学特征、同位素年代学特征,结合区域研究资料,认为松潘-甘孜造山带东缘类似塔公岩体的晚三叠世花岗岩类形成于昌都、扬子和华北地块后碰撞阶段的岩石圈拆沉作用.

       

    • 图  1  塔公岩体大地构造位置及采样位置

      Fig.  1.  Tectonic location and sampling position of the Tagong granite

      图  2  塔公岩体及围岩的地质图

      Fig.  2.  Schematic geological map of the Tagong granite and its surrounding rocks

      图  3  塔公花岗岩体露头照片

      Fig.  3.  The outcrops of Tagong granite

      图  4  塔公花岗岩镜下特征

      a. 石英闪长岩;b. 花岗闪长岩;c、d. 黑云母二长花岗岩

      Fig.  4.  The microscope characteristics of Tagong granite

      图  5  塔公花岗岩体主量元素图解

      Fig.  5.  Graphical diagrams of the main elements of the Tagong granite

      图  6  塔公岩体稀土-微量元素图解

      Fig.  6.  Diagrams of rare earth-trace elements of Tagong granite

      图  7  塔公岩体锆石阴极发光图像

      Fig.  7.  Cathodoluminescence (CL) images for zircons of Tagong granite

      图  8  塔公花岗岩类锆石U-Pb谐和图和加权平均年龄

      Fig.  8.  Zircon U-Pb harmonic diagrams and weighted mean ages of Tagong granite

      图  9  塔公花岗岩体的构造环境判别图解

      Fig.  9.  Diagrams of tectonic environment discrimination of Tagong granite

      图  10  塔公花岗岩体内部的暗色细粒包体

      Fig.  10.  Dark fine-grained inclusions inside the Tagong granite

      表  1  样品信息

      Table  1.   Sample information

      样品编号 样品用途 采样高程(m) 经度 纬度 岩石名称
      PM17-14-1 主量、微量、稀土元素分析 4 171 101°35'21"E 30°12'16"N 灰色细粒石英闪长岩
      PM17-14-2 主量、微量、稀土元素分析 4 171 101°35'21"E 30°12'16"N 灰色细粒石英闪长岩
      PM17-19-1 主量、微量、稀土元素分析;锆石U-Pb同位素 4 209 101°35'12"E 30°12'30"N 灰色细-中粒花岗闪长岩
      PM17-29-1 主量、微量、稀土元素分析;锆石U-Pb同位素 4 143 101°34'46"E 30°13'28"N 灰色细-中粒黑云母花岗闪长岩
      PM17-30-1 主量、微量、稀土元素分析 4 152 101°34'37"E 30°13'31"N 灰白色中粒黑云母二长花岗岩
      PM17-34-1 主量、微量、稀土元素分析 4 124 101°34'21"E 30°13'47"N 灰色中细粒黑云母花二长岗岩
      PM17-43-1 主量、微量、稀土元素分析;锆石U-Pb同位素 4 024 101°34'00"E 30°14'46"N 灰白色细粒黑云母二长花岗岩
      PM17-63-1 主量、微量、稀土元素分析;锆石U-Pb同位素 3 984 101°32'33"E 30°16'50"N 灰白色细粒花岗闪长岩
      PM17-66-1 主量、微量、稀土元素分析 3 948 101°32'32"E 30°17'13"N 灰白色细粒花岗闪长岩
      下载: 导出CSV
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