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    冈底斯中部松多岩组形成时代及物源:来自碎屑锆石U-Pb年代学证据

    解超明 宋宇航 王明 范建军 张红雨 郝宇杰

    解超明, 宋宇航, 王明, 范建军, 张红雨, 郝宇杰, 2019. 冈底斯中部松多岩组形成时代及物源:来自碎屑锆石U-Pb年代学证据. 地球科学, 44(7): 2224-2233. doi: 10.3799/dqkx.2019.024
    引用本文: 解超明, 宋宇航, 王明, 范建军, 张红雨, 郝宇杰, 2019. 冈底斯中部松多岩组形成时代及物源:来自碎屑锆石U-Pb年代学证据. 地球科学, 44(7): 2224-2233. doi: 10.3799/dqkx.2019.024
    Xie Chaoming, Song Yuhang, Wang Ming, Fan Jianjun, Zhang Hongyu, Hao Yujie, 2019. Age and Provenance of Sumdo Formation in Central Gangdise, Tibetan Plateau: Detrital Zircon U-Pb Geochronological Evidence. Earth Science, 44(7): 2224-2233. doi: 10.3799/dqkx.2019.024
    Citation: Xie Chaoming, Song Yuhang, Wang Ming, Fan Jianjun, Zhang Hongyu, Hao Yujie, 2019. Age and Provenance of Sumdo Formation in Central Gangdise, Tibetan Plateau: Detrital Zircon U-Pb Geochronological Evidence. Earth Science, 44(7): 2224-2233. doi: 10.3799/dqkx.2019.024

    冈底斯中部松多岩组形成时代及物源:来自碎屑锆石U-Pb年代学证据

    doi: 10.3799/dqkx.2019.024
    基金项目: 

    中国地质调查局项目 DD20160015

    自然资源部东北亚矿产资源评价重点实验室自主课题基金资助 DBY-ZZ-18-06

    国家自然科学基金项目 41872231

    中国地质调查局项目 DD20160026

    国家自然科学基金项目 41602230

    详细信息
      作者简介:

      解超明(1983-), 男, 副教授, 博士, 从事区域大地构造研究及相关教学工作, 主要从事青藏高原区域地质及大地构造研究

    • 中图分类号: P534.45

    Age and Provenance of Sumdo Formation in Central Gangdise, Tibetan Plateau: Detrital Zircon U-Pb Geochronological Evidence

    • 摘要: 冈底斯中部广泛发育的松多岩组因缺少化石依据,其沉积时代一直存在争议,严重制约了对冈底斯古生代构造演化的认识.在详细野外地质调查基础上,利用LA-ICP-MS锆石U-Pb同位素定年对松多岩组中变质砂岩进行了锆石U-Pb同位素测定,获得变质砂岩中最小碎屑锆石年龄值为316 Ma,时代为晚石炭世,代表了松多岩组形成时代的下限.通过碎屑锆石年龄示踪和区域对比研究,松多岩组物源很可能来自拉萨地块内部(南拉萨地块和北拉萨地块),可能是松多古特提斯洋初始洋盆的沉积记录.研究区松多岩组沉积时代下限的厘定,进一步完善了该区晚古生代地层系统,对冈瓦纳大陆北缘晚石炭世-早二叠世岩相古地理研究具有重要意义.

       

    • 图  1  冈底斯中部大地构造简图(a)及松多地区地质简图(b)

      Fig.  1.  Tectonic framework of the central Gangdise (a) and geological map of the Sumdo area, showing the distribution of the Sumdo Formation (b)

      图  2  松多地区松多岩组野外露头及显微镜下照片

      a.变质砂岩与白云母石英片岩的片理互层现象;b.变质砂岩中的沟槽模构造野外露头照片;c.变质砂岩与变质粉砂岩互层产出,并发育平行层理和交错层理构造;d.白云母石英片岩的野外露头照片;e.变质砂岩正交偏光下的显微照片;f.白云母石英片岩的正交偏光下的显微照片

      Fig.  2.  Field photographs and micrographs of Sumdo Formation in the Sumdo areas

      图  3  冈底斯中部松多岩组中变质砂岩碎屑锆石CL图像、分析点位

      Fig.  3.  Cathodoluminescence (CL) images of representative zircon grains of metamorphosed sandstones from Sumdo Formation in the central Gangdise

      图  4  冈底斯中部松多岩组变质砂岩碎屑锆石U-Pb谐和图和年龄直方图

      Fig.  4.  Concordia plots and age histogram of detrital zircon from metamorphosed sandstones in the central Gangdise

      图  5  羌北、羌南、北拉萨、南拉萨、特提斯喜马拉雅及西澳大利亚地层中碎屑锆石年龄谱系对比

      a.南拉萨碎屑锆石数据,据Zhang et al.(2008)Dong et al.(2010)Guo et al.(2012)Guo et al.(2016);b.羌北-昌都板块中碎屑锆石数据,据Gehrels et al.(2011)Jiang et al.(2015);c.羌南-保山板块中碎屑锆石数据,据Gehrels et al.(2011)Fan et al.(2015);d.北拉萨地块中碎屑锆石数据,据Gehrels et al.(2011)Zhu et al.(2011)Li et al.(2014);e.特提斯喜马拉雅地层中的碎屑锆石数据,据Aikman et al.(2008)Gehrels et al.(2011);f.西澳大利亚中碎屑锆石数据,据Cawood and Nemchin(2000)Veevers et al.(2005).

      Fig.  5.  Distribution of zircon ages of detrital zircons from sedimentary compared to the distributions of the North Qiangtang, South Qiangtang, North Lhasa, South Lhasa, Tethyan Himalayan and western Australia

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