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    西藏措勤地区敌布错组时代重新厘定

    刘函 李俊 高睿 苟正彬 张士贞

    刘函, 李俊, 高睿, 苟正彬, 张士贞, 2024. 西藏措勤地区敌布错组时代重新厘定. 地球科学, 49(9): 3071-3088. doi: 10.3799/dqkx.2023.086
    引用本文: 刘函, 李俊, 高睿, 苟正彬, 张士贞, 2024. 西藏措勤地区敌布错组时代重新厘定. 地球科学, 49(9): 3071-3088. doi: 10.3799/dqkx.2023.086
    Liu Han, Li Jun, Gao Rui, Gou Zhengbin, Zhang Shizhen, 2024. The Age Re-Determination of the Dibucuo Formation in Cuoqin Area, Xizang. Earth Science, 49(9): 3071-3088. doi: 10.3799/dqkx.2023.086
    Citation: Liu Han, Li Jun, Gao Rui, Gou Zhengbin, Zhang Shizhen, 2024. The Age Re-Determination of the Dibucuo Formation in Cuoqin Area, Xizang. Earth Science, 49(9): 3071-3088. doi: 10.3799/dqkx.2023.086

    西藏措勤地区敌布错组时代重新厘定

    doi: 10.3799/dqkx.2023.086
    基金项目: 

    中国地质调查局项目 DD20240032

    中国地质调查局项目 D20221635

    中国地质调查局项目 DD20221811

    科技部青藏科考项目 2019QZKK0706

    详细信息
      作者简介:

      刘函(1986-),男,高级工程师,硕士,从事青藏高原地质调查及特提斯演化研究. ORCID:0000-0002-7227-8744. E-mail:liuhan_cdcgs@163.com

    • 中图分类号: P535

    The Age Re-Determination of the Dibucuo Formation in Cuoqin Area, Xizang

    • 摘要: 措勤地区上二叠统敌布错组与区域上古生物及地层研究进展存在矛盾,需要加强对其时代的厘定以准确理解其地质意义.基于锆石U-Pb定年,并结合野外调查与区域地层对比,将敌布错组重新归并为3类时代不同的岩石地层单元.敌布错组A以含砾砂板岩及晚古生代植物化石为特征,碎屑锆石年龄谱与拉嘎组类似,为拉嘎组或者昂杰组.敌布错组B为海陆交互相碎屑岩,获得系列早白垩世早期年龄值,结合被早白垩世岩体侵位的特征将其厘定为则弄群下部.敌布错组C完全由早白垩世晚期火山岩与火山碎屑岩组成,与则弄群上部一致.结合区域资料,认为措勤地区中二叠世‒晚三叠世为连续的碳酸盐岩沉积,没有受到晚古生代岛弧造山作用的影响,早白垩世班公湖‒怒江残余海盆的南界在措勤地区较之前的认识向南推进了约50 km.

       

    • 图  1  冈底斯带构造分区图(a)及敌布错组不同岩石单元分布(b、c)

      Ⅰ.班公湖‒怒江结合带;Ⅱ.北冈底斯带;Ⅲ.狮泉河‒拉果错‒永珠‒嘉黎结合带;Ⅳ.中冈底斯带;Ⅴ.冈底斯弧背断隆带;Ⅵ.南冈底斯带;Ⅶ.日喀则弧前盆地;Ⅷ.雅鲁藏布江结合带;岩体年龄引自Zhu et al.(2009)崔浩杰等(2019)

      Fig.  1.  Structural stratigraphic zoning map of Gangdese belt (a), and the distribution of different rock units of Dibucuo Formation (b, c)

      图  2  措勤地区晚古生代‒白垩纪地层划分对比

      Fig.  2.  Evolution of Late Paleozoic Cretaceous stratigraphic division in Cuoqin area

      图  3  措勤地区敌布错组A含砾砂岩野外露头照片

      a.含砾岩屑砂岩;b.钙质含砾砂岩

      Fig.  3.  Outcrop photograph of conglomerate-bearing sandstone for the Dibucuo Formation A in Cuoqin area

      图  4  措勤地区敌布错组B野外特征

      a.日阿角度不整合剖面图;b.日阿敌布错组B角度不整合在下拉组之上;c.门缸错北岩石组合;d.尼雄村西火山岩夹层;e.扎日南木错南坡凝灰质粉砂质砂岩

      Fig.  4.  Outcrop photograph for the Dibucuo Formation B in Cuoqin area

      图  5  锆石测年分析碎屑岩镜下照片

      a.粉砂岩;b.岩屑砂岩;c.岩屑石英砂岩;d.凝灰质粉砂质砂岩;e.凝灰质岩屑石英砂岩. Qtz.石英;Mt.磁铁矿;Kf.钾长石;Pl.斜长石;Se.绢云母

      Fig.  5.  Microphotograph of detrital rocks for zircon dating

      图  6  措勤地区敌布错组A(a)与敌布错组B(b~e)锆石阴极发光照片

      Fig.  6.  Zircon cathodoluminescence images for detrital rocks from the Dibucuo Formation A (a) and B (b‒e) in Cuoqin area

      图  7  措勤地区敌布错组A与敌布错组B碎屑锆石谐和图(a~c)和频谱图(d~f)

      Fig.  7.  LA-ICP-MS zircon U-Pb concordia diagram (a‒c) and probabilities (d‒f) for zircons from the Dibucuo Formation A and B in Cuoqin area

      图  8  措勤地区敌布错组B凝灰质粉砂质砂岩(a、b)和凝灰质岩屑石英砂岩(c、d)锆石U-Pb协和图及加权平均年龄

      Fig.  8.  LA-ICP-MS zircon U-Pb concordia diagram and weighted mean age for tuffaceous silty sandstone (a, b) and tuffaceous lithic quartz sandstone (c, d) from Dibucuo Formation B in Cuoqin area

      图  9  敌布错组重要剖面岩石组合与古生物特征对比及岩石单元划分重新认识

      Fig.  9.  Correlation of rock assemblages and paleontological characteristics of three Dibucuo Formation sections, and recognition of rock unit division

      图  10  措勤地区敌布错组南北向剖面新老认识对比

      数据来源:①李晓勇等(2002);②刘函等(2020);③崔浩杰等(2019);④苟正彬等(2018)

      Fig.  10.  New and old cognition comparison about Dibucuo Formation based on a north-south section with in Cuoqin area

      图  11  措勤地区则弄群砂岩与其可能的源区岩石碎屑锆石频谱对比

      Fig.  11.  Composite detrital zircon U-Pb age spectra of sandstones from the Zenong Group in Cuoqin area (this study) and rocks in potential source regions

      图  12  措勤地区早白垩世地层及岩石组合特征

      Fig.  12.  Early Cretaceous strata and their rock assemblage characteristics in Cuoqin area

      图  13  措勤地区早白垩世古地理格局对比

      a. 传统认识;b. 本文认识

      Fig.  13.  Comparison of Early Cretaceous paleogeographic pattern in Cuoqin area

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    出版历程
    • 收稿日期:  2022-10-05
    • 网络出版日期:  2024-10-16
    • 刊出日期:  2024-09-25

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