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    西藏昂仁县孔隆地区木纠错组诺利期牙形石的发现及其地质意义

    李俊 刘函 黄金元 苟正彬 安显银 张士贞

    李俊, 刘函, 黄金元, 苟正彬, 安显银, 张士贞, 2020. 西藏昂仁县孔隆地区木纠错组诺利期牙形石的发现及其地质意义. 地球科学, 45(8): 2957-2963. doi: 10.3799/dqkx.2020.077
    引用本文: 李俊, 刘函, 黄金元, 苟正彬, 安显银, 张士贞, 2020. 西藏昂仁县孔隆地区木纠错组诺利期牙形石的发现及其地质意义. 地球科学, 45(8): 2957-2963. doi: 10.3799/dqkx.2020.077
    Li Jun, Liu Han, Huang Jinyuan, Gou Zhengbin, An Xianyin, Zhang Shizhen, 2020. Discovery of Norian Conodonts from Mujiucuo Formation in Konglong Area of Ngamring County in Tibet and Its Geological Significance. Earth Science, 45(8): 2957-2963. doi: 10.3799/dqkx.2020.077
    Citation: Li Jun, Liu Han, Huang Jinyuan, Gou Zhengbin, An Xianyin, Zhang Shizhen, 2020. Discovery of Norian Conodonts from Mujiucuo Formation in Konglong Area of Ngamring County in Tibet and Its Geological Significance. Earth Science, 45(8): 2957-2963. doi: 10.3799/dqkx.2020.077

    西藏昂仁县孔隆地区木纠错组诺利期牙形石的发现及其地质意义

    doi: 10.3799/dqkx.2020.077
    基金项目: 

    国家自然科学基金项目 41972113

    国家自然科学基金项目 41802071

    第二次青藏高原综合科学考察研究 2019QZKK0706

    中国地质调查局项目 DD20190053

    详细信息
      作者简介:

      李俊(1987-), 男, 工程师, 长期从事青藏高原基础调查及地质演化研究. ORCID: 0000-0001-6520-976X. E-mial: cdlijunwonder@163.com

    • 中图分类号: P535

    Discovery of Norian Conodonts from Mujiucuo Formation in Konglong Area of Ngamring County in Tibet and Its Geological Significance

    • 摘要: 拉萨地块晚二叠世-三叠纪地层的研究对认识青藏高原前新生代特提斯演化具有重要意义,但目前对该时期的沉积充填序列及古地理环境尚未形成统一认识.通过对西藏昂仁县孔隆地区开展的详细地层和牙形石相关研究,在木纠错组上部发现了晚三叠世诺利期Epigondolella sp.牙形石分子,在下拉组顶部发现了时代跨越晚二叠统长兴阶和早三叠统印度阶的牙形石Hindeodus typicalis;从而将研究区木纠错组时代重新厘定为晚二叠世长兴期至晚三叠世诺利期,指示拉萨地块西部三叠纪应仍为连续的浅海相沉积.

       

    • 图  1  青藏高原大地构造单元(a)和拉萨地块石炭-三叠纪地层时空分布(b)

      王立全等(2013)修改. JSSZ.金沙江结合带;LSSZ.龙木错-双湖结合带;BNSZ.班公湖-怒江结合带;YZSZ.雅鲁藏布江结合带. I1.那曲-洛隆;I2.班戈-八宿;I3.狮泉河-申扎-嘉黎;I4.措勤-申扎;I5.隆格尔-南木林;I6.拉萨-察隅;I7.日喀则

      Fig.  1.  Geological map of geotectonic units on the Qinghai-Tibet Plateau (a) and the distribution of Carboniferous-Triassic strata in Lhasa Block (b)

      图  2  拉萨地块二叠系-三叠系划分对比

      夏代祥和刘世坤(1997)

      Fig.  2.  Division of Permian-Triassic strata in Lhasa Block

      图  3  西藏孔隆剖面木纠错组剖面及牙形石采样位置

      Fig.  3.  The section of Mujiucuo Formation in the Konglong area of Tibet, showing the location of conodont samples

      图  4  孔隆剖面中牙形石扫描电镜照片

      a. H.typicalis,侧视;b. H.typicalis,口视;c. Epigondolella属,口视;d.?Parapetella属,侧视;e~g. Epigondolella sp.,侧视;h、i.枝形分子残片,侧视

      Fig.  4.  SEM photos of conodonts from the Konglong section

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