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    藏北唐古拉山地区沱沱河组孢粉组合及其地层意义

    段其发 张克信 王建雄 姚华舟 卜建军

    段其发, 张克信, 王建雄, 姚华舟, 卜建军, 2007. 藏北唐古拉山地区沱沱河组孢粉组合及其地层意义. 地球科学, 32(5): 629-637.
    引用本文: 段其发, 张克信, 王建雄, 姚华舟, 卜建军, 2007. 藏北唐古拉山地区沱沱河组孢粉组合及其地层意义. 地球科学, 32(5): 629-637.
    DUAN Qi-fa, ZHANG Ke-xin, WANG Jian-xiong, YAO Hua-zhou, BU Jian-jun, 2007. Sporopollen Assemblage from the Totohe Formation and Its Stratigraphic Significance in the Tanggula Mountains,Northern Tibet. Earth Science, 32(5): 629-637.
    Citation: DUAN Qi-fa, ZHANG Ke-xin, WANG Jian-xiong, YAO Hua-zhou, BU Jian-jun, 2007. Sporopollen Assemblage from the Totohe Formation and Its Stratigraphic Significance in the Tanggula Mountains,Northern Tibet. Earth Science, 32(5): 629-637.

    藏北唐古拉山地区沱沱河组孢粉组合及其地层意义

    基金项目: 

    中国地质调查局重大基础研究项目 1212010610103

    大调查项目 200013000009121

    湖北省地球表层系统开放实验室基金项目 LESS-0102

    详细信息
      作者简介:

      段其发(1966-), 男, 博士生, 副研究员, 从事区域地质调查和新生代地层研究. E-mail:502xaohan@163.com

    • 中图分类号: P534;Q911

    Sporopollen Assemblage from the Totohe Formation and Its Stratigraphic Significance in the Tanggula Mountains,Northern Tibet

    • 摘要: 唐古拉山地区广泛出露早新生代陆相红层, 确定这些红层的时代对认识青藏高原的形成具有非常重要的意义.沱沱河组上部的孢粉化石组合以被子植物花粉为主, 且主要为三沟和三孔沟类, 包括栎粉属 (尤其是小栎粉和小亨氏栎粉) 、楝粉属、坡氏粉属和三孔沟粉属等, 具孔类花粉很少, 大部分属种为古近纪常见分子;组合中出现少量鸡爪勒粉属、唇形三沟粉属、山萝卜粉属、管花菊粉属等草本植物花粉;并含有零星古老类型的成分, 如克拉梭粉属、五边粉属和江汉粉属;裸子植物花粉含量低, 蕨类植物孢子零星.基于孢粉组合特征分析, 认为沱沱河组上部的地质时代为始新世中晚期, 为进一步完善了该区新生代地层系统提供了新的依据.

       

    • 图  1  研究区地质略图及化石采样点

      1.土门格拉群;2.雁石坪群;3.沱沱河组;4.雅西措组;5.查保马组;6.曲果组;7.断层;8.角度不整合;9.化石采集点;10.研究区位置

      Fig.  1.  Sketch geological map of the reseach area and the fossils smapling position

      图  2  沱沱河组孢粉组合的主要分子

      1.Lycopodiumsporites neogenicus Ke Shi晚第三纪石松孢;2.Cedripites diversus Ke Shi微张雪松粉;3.Podocarpidites and iniformis (Zaklinskaja) 安定型罗汉松粉;4.Classopollis annulatus (Verb.) Li环圈克拉梭粉;5.Tsugaepollenites igniculus major (Pot.) Potonie大型具缘铁杉粉;6.Piceaepollenite alatus R. Potonié具囊云杉粉;7.Ephedripites sp.麻黄粉 (未定种) ;8.E (D.) eocenipites (Wodehouse) Krutzsch ×800始新麻黄粉;9.Juglanspollenites verus Raatz真胡桃粉;10.Alnipollenites verus (R. Potonié) R. Potonié真桤木粉;11.Cupuliferoipollenites sp.栗粉属 (未定种) ;12.Quercoidites microhenrici (Potonié) 小亨氏栎粉;13.Celtispollenites triporatus Sun & Li三孔朴粉;14. Meliaceoidites microreticulatus Zhu et Xi ping细网楝粉;15.M. rotundus Ke Shi圆形楝粉;16.Pokrovskaja sp.坡氏粉 (未定种) ;17-18.P. maximus Zhu Xi ping巨大坡氏粉;19.P. pachypolarus Zhu Xi ping厚极坡氏粉;20.Tricolpopollenites sp.三沟粉 (未定种) ;21.Euphorbiacites reticulates Li, Song Li网纹大戟粉

      Fig.  2.  Main elemnts of the sporopollen assemblage from the Totohe Formations

      表  1  沱沱河组孢粉化石统计

      Table  1.   Abundance of fossil sporopollen in the Totohe formation in the Tanggula mountains

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