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    西藏南羌塘盆地中三叠世座倾错组放射虫动物群及其地层学意义

    李亚 纪占胜 武桂春 姚建新 王玉净

    李亚, 纪占胜, 武桂春, 姚建新, 王玉净, 2018. 西藏南羌塘盆地中三叠世座倾错组放射虫动物群及其地层学意义. 地球科学, 43(11): 3932-3946. doi: 10.3799/dqkx.2018.292
    引用本文: 李亚, 纪占胜, 武桂春, 姚建新, 王玉净, 2018. 西藏南羌塘盆地中三叠世座倾错组放射虫动物群及其地层学意义. 地球科学, 43(11): 3932-3946. doi: 10.3799/dqkx.2018.292
    Li Ya, Ji Zhansheng, Wu Guichun, Yao Jianxin, Wang Yujing, 2018. Radiolarian Fauna from Middle Triassic of Zuoqingcuo Formation, Southern Qiangtang Basin, Xizang, China, and Its Stratigraphic Significance. Earth Science, 43(11): 3932-3946. doi: 10.3799/dqkx.2018.292
    Citation: Li Ya, Ji Zhansheng, Wu Guichun, Yao Jianxin, Wang Yujing, 2018. Radiolarian Fauna from Middle Triassic of Zuoqingcuo Formation, Southern Qiangtang Basin, Xizang, China, and Its Stratigraphic Significance. Earth Science, 43(11): 3932-3946. doi: 10.3799/dqkx.2018.292

    西藏南羌塘盆地中三叠世座倾错组放射虫动物群及其地层学意义

    doi: 10.3799/dqkx.2018.292
    基金项目: 

    中国地质调查局项目 DD20160126

    中国地质调查局项目 DD20160120-04

    科技基础性工作专项 2015FY310100

    中国地质科学院基本科研业务费 J1607

    中国地质调查局项目 DD20160120-02

    国家自然科学基金项目 41472030

    详细信息
      作者简介:

      李亚(1983-), 男, 助理研究员, 博士, 从事中-新生代地层与古生物学研究

      通讯作者:

      纪占胜

    • 中图分类号: P535

    Radiolarian Fauna from Middle Triassic of Zuoqingcuo Formation, Southern Qiangtang Basin, Xizang, China, and Its Stratigraphic Significance

    • 摘要: 前人研究表明西藏南羌塘盆地存在中三叠世地层,然而一直以来缺乏确凿的古生物化石证据.在西藏改则县古姆乡座倾错地区原被划为晚三叠世日干配错组的地层中测制了两条剖面,在硅质岩样品中分析和鉴定出18属33种(含未定种)放射虫化石,主要分子包括Cryptostephanidium longispinosum(Sashida)、Eptingium manfredi Dumitrica、Falcispongus falciformis Dumitrica、Hindeosphaera spinulosa(Nakaseko et Nishimura)、Muelleritortis firmum(Gorican)、Oertlispongus inaequispinosus Dumitrica,Kozur et Mostler、Paroertlispongus chinensis(Feng)、Paroertlispongus hermi(Lahm)、Paroertlispongus weddigei Lahm、Paurinella aequispinosa Kozur et Mostler、Pseudostylosphaera coccostyla(Rüst)、Pseudostylosphaera compacta(Nakaseko et Nishimura)、Pseudostylosphaera gracilis Kozur et Mostler、Pseudostylosphaera japonica(Nakaseko et Nishimura)、Pseudostylosphaera nazarovi(Kozur et Mostler)、Pseudostylosphaera tenue(Nakaseko et Nishimura)、Triassocampe imitata Bragin、Triassospongosphaera triassica(Kozur et Mostler).座倾错放射虫化石组合指示这段地层时代为中三叠世安尼期晚期-拉丁期早期.结合之前的工作积累,将南羌塘盆地三叠系划分为表示稳定型浅海相碳酸盐岩沉积的下三叠统孜狮桑组、表示半深海-深海相碎屑岩-硅质岩沉积的中三叠统座倾错组、上三叠统日干配错组以及上三叠统-下侏罗统萨门熊组.该发现为了解中三叠世南羌塘地区的真实面貌提供了地层学和古生物学证据,也进一步证明中三叠世南羌塘盆地不是陆地剥蚀区或隆起区,而是一种半深海-深海相沉积区.

       

    • 图  1  羌塘盆地南部三叠系地层划分沿革

      ①西藏自治区地质调查院, 2003, 1:25万兹格塘错幅区域地质调查报告;②江西省地质调查院, 2004, 1:25万日土县幅区域地质调查报告;③贵州省地质调查院, 2005a, 1:25万丁固幅区域地质调查报告;④贵州省地质调查院, 2005b, 1:25万加措幅区域地质调查报告;⑤吉林大学地质调查研究院, 2006, 1:25万玛依岗日幅区域地质调查报告;⑥吉林省地质调查院, 2006a, 1:25万昂达尔错幅区域地质调查报告;⑦吉林省地质调查院, 2006b, 1:25万帕度错幅区域地质调查报告;⑧四川省地质调查院, 2006, 1:25万物玛幅区域地质调查报告

      Fig.  1.  The stratigraphic division of the Triassic in southern Qiangtang basin, Tibet

      图  2  研究区地理位置示意

      Fig.  2.  Sketch of the location of the studied area

      图  3  研究区域地质简图

      根据贵州省地质调查院(2005a,1:25万丁固幅区域地质调查报告)简化

      Fig.  3.  Geological map of the studied area

      图  4  西藏改则县古姆乡座倾错地区中三叠统实测剖面

      Fig.  4.  The investigated sections of the Middle Triassic in the Zuoqingcuo area, Jimu Town, Tibet

      图  5  西藏改则县古姆乡中三叠世放射虫

      比例尺均为100 μm.1~2.Parasepsagon firmum (Gorican); 3~4.Pseudostylosphaera japonica (Nakaseko et Nishimura); 5.Pseudostylosphaera nazarovi (Kozur et Mostler); 6.Pseudostylosphaera gracilis Kozur et Mostler; 7.Pseudostylosphaera coccostyla (Rüst); 8~9, 15.Pseudostylosphaera compacta (Nakaseko et Nishimura); 10.Pseudostylosphaera tenue (Nakaseko et Nishimura); 11~12.Cryptostephanidium longispinosum (Sashida); 13.Eptingium manfredi Dumitrica; 14.Hindeosphaera spinulosa (Nakaseko et Nishimura); 16.Falcispongus falciformis Dumitrica; 17.F. calcaneum Dumitrica; 18.Oertlispongus inaequispinosus Dumitrica, Kozur et Mostler; 19.Paroertlispongus chinensis (Feng); 20.Paroertlispongus hermi (Lahm); 21.Paurinella aequispinosa Kozur et Mostler; 22.Triassocampe imitata Bragin; 23.Triassospongosphaera triassica (Kozur et Mostler)

      Fig.  5.  Middle Triassic radiolarians from Jimu Town, Gaize County, Tibet

      图  6  西藏改则县古姆乡中三叠世放射虫(续)

      比例尺均为100 μm.1~3, 9~10.Pseudostylosphaera compacta (Nakaseko et Nishimura); 4~6.Pseudostylosphaera japonica (Nakaseko et Nishimura); 7~8.Pseudostylosphaera magnispinosa Yeh; 11.Pseudostylosphaera sp.; 12~16.Hindeosphaera spinulosa (Nakaseko et Nishimura); 17, 20.Paroertlispongus hermi (Lahm); 18.Paroertlispongus chinensis (Feng); 19.Paroertlispongus sp.; 21~22.Paroertlispongus cf. diacanthus Sugiyama; 23.Cryptostephanidium japonicum (Nakaseko et Nishimura); 24~25.Eptingium manfredi Dumitrica; 26~27.Annulotriassocampe sulovensis (Kozur et Mock); 28.Tetrapaurinella sp.; 29.Spongopallium sp.

      Fig.  6.  Middle Triassic radiolarians from Jimu Town, Gaize County, Tibet (continued)

      图  7  西藏改则县古姆乡放射虫地质年代延限统计

      Fig.  7.  The geological age ranges of the radiolarians from Jimu Town, Gaize County, Tibet

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    • 收稿日期:  2018-04-17
    • 刊出日期:  2018-11-15

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