Chinese Science Bulletin, Volume 64 , Issue 15 : 1620-1636(2019) https://doi.org/10.1360/N972018-01092

The disappearance of the Late Cretaceous Bangong-Nujiang residual seaway constrained by youngest marine strata in Geji area, Lhasa Terrane

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  • ReceivedNov 7, 2018
  • AcceptedFeb 27, 2019
  • PublishedApr 28, 2019


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感谢南京大学赖文、许艺炜在西藏野外工作和修订过程中给予的帮助; 马安林、傅焓埔、蒋璟鑫协助本次工作的实验分析并在写作过程中进行了有益的讨论, 刘群在写作过程中给予了帮助. 感谢评审人提出的建设性的意见.



图S1 唐杂组中段底栖大有孔虫演化与分带特征

图S2 唐杂组有孔虫化石

图S3 唐杂组显微照片

图S4 唐杂组碎屑锆石εHf(t)图解

本文以上补充材料见网络版csb.scichina.com. 补充材料为作者提供的原始数据, 作者对其学术质量和内容负责.


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  • Figure 1

    Geological map of the Qinghai-Tibet Plateau. (a) Simplified tectonic map of the Himalaya-Tibetan Plateau after Zhu et al.[3]; (b) simplified geological map of the study area showing major terranes, suture zones and faults. JSSZ, Jinshajiang suture zone; BNSZ, Bangong-Nujiang suture zone; SNMZ, Shiquan River-Nam Co mélange zone; LMF, Luobadui-Milashan fault; IYSZ, Indus-Yarlung Zangbo suture zone

  • Figure 2

    Photographs of outcrops in Tangza Formation. (a) The contact boundary between the lower Tangza Formation and Langshan Formation is covered, which is presumed to be unconformable contact; (b) the middle Tangza Formation is marked by the appearance of limestone; (c) conformable contact between the middle section and upper section; (d) angular unconformity between Tangza Formation and Jingzhushan Formation; (e) greenish-gray mixed sedimentary and marlstone in middle section; (f) erosion surface in upper section; (g) trough cross bedding in the sandstone; (h) limestone gravels with poor sorting, Jingzhushan Formation; (i) graded bedding in upper section; (j) sand lens in upper section

  • Figure 3

    Stratigraphic logs of the three measured sections in the Tangza Formation and Jingzhushan Formation with lithofacies and sample locations. The sample number marked were used to detrital zircon dating, sandstone petrography studying and foraminifera identification

  • Figure 4

    (Color online) Ternary diagrams for sandstones of the Tangza Formation and Jingzhushan Formation. (a) Sandstone classification diagram; (b) Lv-Ls-Lm diagram[65]

  • Figure 5

    (Color online) U-Pb relative age probability density diagrams for detrital zircons from Tangza Formation. Results are compared with data from: Southern Qiangtang terrane[6670]; Bangong-Nujiang suture zone[7174]; central Lhasa terrane[41,68,69,75,76]

  • Figure 6

    (Color online) Paleogeographic cartoons of Tangza Formation in different stages. (a) The lower Tangza Formation: Marine-continental transitional stage; (b) the middle Tangza Formation: Sea level rise with limestone and mixed sedimentary; (c) the upper Tangza Formation: The seawater retreated from northern-central Lhasa

  • Table 1   Statistical table of gravel composition in the field








































  • Table 2   Lithofacies from Tangza Formation and their general sedimentological interpretation (according to Miall)





    厚层, 颗粒支撑, 中粗粒砾岩, 分选中差, 近圆形-角砾状, 排列混杂, 层厚数十厘米~数米



    厚层, 杂基支撑, 中粒砾岩, 分选差, 半棱角-棱角状, 排列混杂, 层厚约数十厘米~数米, 规模较Gcm小



    颗粒支撑, 中粒砾岩, 含砂质基质, 槽状交错层理, 分选中, 角砾-近圆状砾石, 层厚数十厘米



    颗粒支撑、中细粒砾岩、分选较好、水平成层, 砾石呈叠瓦状排列



    厚层中粗粒砂岩, 偶含砾, 层厚数十厘米, 横向延伸数十米






    中细粒砂岩、平行层理、10~30 cm



    细-中粒砂岩; 小型、不对称流水波痕

    较弱的水动力条件(20~40 cm/s)下砂纹迁移, 较浅水深里的单向流动


    中-极粗粒砂岩; 板状交错层理

    中等强度水动力(40~60 cm/s)大型波纹迁移; 单向水流; 沙坝横向迁移


    红色厚层粉砂岩、含少量碎砾和结核、层厚约0.1~2 m、小型平行纹层












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