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    扬子陆块北缘西大别地区定远组双峰式火山岩U-Pb年代学及其地质构造意义

    朱江 彭三国 彭练红 许珂 张闯 刘锦明 王祥东

    朱江, 彭三国, 彭练红, 许珂, 张闯, 刘锦明, 王祥东, 2019. 扬子陆块北缘西大别地区定远组双峰式火山岩U-Pb年代学及其地质构造意义. 地球科学, 44(2): 355-365. doi: 10.3799/dqkx.2018.541
    引用本文: 朱江, 彭三国, 彭练红, 许珂, 张闯, 刘锦明, 王祥东, 2019. 扬子陆块北缘西大别地区定远组双峰式火山岩U-Pb年代学及其地质构造意义. 地球科学, 44(2): 355-365. doi: 10.3799/dqkx.2018.541
    Zhu Jiang, Peng Sanguo, Peng Lianhong, Xu Ke, Zhang Chuang, Liu Jinming, Wang Xiangdong, 2019. Geochronology of Bimodal Volcanic Rocks from Dingyuan Formation in Western Dabie Orogen, Central China: Implications for Extension during Breakup of Rodinia. Earth Science, 44(2): 355-365. doi: 10.3799/dqkx.2018.541
    Citation: Zhu Jiang, Peng Sanguo, Peng Lianhong, Xu Ke, Zhang Chuang, Liu Jinming, Wang Xiangdong, 2019. Geochronology of Bimodal Volcanic Rocks from Dingyuan Formation in Western Dabie Orogen, Central China: Implications for Extension during Breakup of Rodinia. Earth Science, 44(2): 355-365. doi: 10.3799/dqkx.2018.541

    扬子陆块北缘西大别地区定远组双峰式火山岩U-Pb年代学及其地质构造意义

    doi: 10.3799/dqkx.2018.541
    基金项目: 

    中国地质调查局项目 121201009000150013

    中国地质调查局项目 121201009000160902

    详细信息
      作者简介:

      朱江(1985-), 男, 博士, 高级工程师, 主要从事矿产普查与勘探研究

    • 中图分类号: P596

    Geochronology of Bimodal Volcanic Rocks from Dingyuan Formation in Western Dabie Orogen, Central China: Implications for Extension during Breakup of Rodinia

    • 摘要: 西大别地区定远组由浅变质的酸性火山岩(流纹岩和流纹质凝灰岩)和基性火山岩组成,二者在空间上互层产出,具典型的双峰式火山岩系组合特征,为认识南秦岭-大别造山带及扬子陆块北缘前寒武纪物质组成和地质演化提供了极佳的研究对象.通过对2件变流纹岩、1件变流纹质晶屑凝灰岩和1件变基性火山岩样品进行LA-ICP-MS锆石原位U-Pb测年,获得其成岩年龄分别为737±5 Ma、740±3 Ma、740±5 Ma和739±6 Ma.结果表明,定远组双峰式火山岩系形成时代并非前人认识的古生代,而是新元古代约740 Ma.定远组与红安岩群双峰式火山建造形成时间基本一致,指示了西大别地区新元古代一次重要的拉张构造-岩浆事件,可能形成于大陆边缘裂谷环境.扬子陆块北缘武当-随枣-大别地区新元古代800~720 Ma岩浆活动广泛且强烈,其峰期为755~730 Ma,可能是对Rodinia超大陆裂解事件的响应.

       

    • 图  1  西大别地区地质简图

      NWZ.泥盆系南湾组陆源碎屑岩; DYZ.定远组变质火山岩带;HWZ.浒湾组混杂岩带;XXZ.新县超高压变质带;HZ.红安岩群;SZ.宿松岩群;据刘贻灿等(2010)修改

      Fig.  1.  The geological sketch map of the Western Dabie belt

      图  2  定远组双峰式火山岩剖面

      Fig.  2.  Section showing the bimodal volcanic suite of the Dingyuan Formation

      图  3  定远组双峰式火山岩典型野外现象、手标本和显微照片

      a.双峰式火山岩典型野外现象照片,浅变质流纹岩和变基性火山岩互层产出,并持续向南延伸.1、3、5、7层为浅变质流纹岩,2、4、6层为变基性火山岩(斜长角闪岩);b.变流纹岩手标本照片;c.变流纹岩正交偏光显微照片;d.变流纹质凝灰岩手标本照片;e.变流纹质凝灰岩单偏光显微照片;f.变基性火山岩手标本照片;g.变基性火山岩单偏光显微照片.Pl.斜长石; Qz.石英; Hbl.角闪石

      Fig.  3.  Field photograph, hand spicemen and photo micrograph of the bimodal volcanic suite from the Dingyuan Formation

      图  4  定远组双峰式火山岩锆石CL图像

      Fig.  4.  Cathodoluminescence images and LA-ICP-MS U-Pb determination spots with ages of representative zircons from the bimodal volcanic suite of the Dingyuan Formation

      图  5  定远组双峰式火山岩锆石U-Pb年龄

      a、b.浅变质流纹岩样品PM026-7锆石U-Pb年龄谐和图和加权平均年龄图,3颗变质锆石年龄未显示;c、d.浅变质流纹岩样品PM027-7锆石U-Pb年龄谐和图和加权平均年龄图;e、f.浅变质流纹质晶屑凝灰岩样品PM027-10锆石U-Pb年龄谐和图和加权平均年龄图;g、h.变基性火山岩样品PM027-6锆石U-Pb年龄谐和图和加权平均年龄图,变质锆石和捕获锆石数据未显示

      Fig.  5.  U-Pb concordia diagrams and weighted mean ages for the bimodal volcanic suite from the Dingyuan Formation

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    • 收稿日期:  2018-12-20
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