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Article Navigation >  Acta Sedimentologica Sinica  > 2002  >  20(2): 282-287

YANG Dong, . Pediment near the Western Liupan Mountain and Its Implication on the Neotectonic Uplift[J]. Acta Sedimentologica Sinica, 2002, 20(2): 282-287.
Citation: YANG Dong, . Pediment near the Western Liupan Mountain and Its Implication on the Neotectonic Uplift[J]. Acta Sedimentologica Sinica, 2002, 20(2): 282-287.
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Pediment near the Western Liupan Mountain and Its Implication on the Neotectonic Uplift

  • 1.

    Key Laboratory of Western China's environment Systems of Ministry of education& Depart ment of geography,Lanzhou university,Lanzhou, 730000;

  • 2.

    Nort hwest Nor mal university,Lanzhou, 730070,China;

  • 3.

    Instit ute of eart h environment,Chinese Academy of Sciences,Xi'an,750054 China

  • Received Date: 2001-06-28
  • Rev Recd Date: 2001-10-11
  • Publish Date: 2002-04-10
  • The late Cenozoic uplift of the Tibetan Plateau played a great role in the geomorphic and depositional evolution of its adjacent areas. This effect has brought about the Liupan Mountain at the northeastern tectonic margin of the Tibetan Plateau developed with quite different geomorphology in its two sides, resulting in large differences in wind-blown depositional environment between the eastern and western parts of the Chinese Loess Plateau. A well-preserved pediment, covered by 235 m thick loess, was recently found at the western side of the Liupan Mountain, which stands above the highest terrace of the Yellow River in the northeastern Longzhong Basin. The paleomagnetism of the loess section shows that the pediment developed at ～1.8 Ma BP, so did that of the pediments in Lanzhou-Linxia region in the southwestern Longzhong Basin. This implies that the Longzhong Basin to the west of the Liupan Mountain had been subject to long term denudation before ～1.8 Ma BP, and wight have finally developed a joined pediment or so-called Gansu Peneplain covering the whole Longzhong Basin. The large incision of the pediment and start of deposition of loess on the pediment at ～1.8 Ma BP suggest that the Tibetan Plateau and the Liupan Mountain rose strongly at that time, causing not only the end of the pediment but also the subsequent appearance of the Yellow River in the Basin.
  • [1] 1. 李吉均。晚新生代黄河上游地貌演化与青藏高原隆升[J].中国科学，B 辑，1996,26（4）:136～146[Li Jijun.The geomorphological evolution in the upper reaches of the Yellow River and uplift of Qinghai-Xizang Pleteau[J].Scientia Sinica.Series D ,1996,26（4）:316～146]

    2. Ruddiman,W F,and Kutzbach,J.E.Late Cenozoic plateau uplift and climate change[J].Trans.Roy.Soc.Edinb.Earth Sci.,1990,81: 301～314

    3. 李吉均。青藏高原隆升的时代、幅度和形式问题的探讨[J].中国科学，1979,22（6）:608～616[Li J J.A discussion on the period,amplitude and type of the uplift of the Qinghai-Xizang Plateau[J].Scientia Sinica,1979,22（6）:608～616]

    4. Lijijun.Late Cenozonic magnetratigraphy （11～OMa） of the Dongshanding and Wangjiashan sections in the Longzhong Basin ,Western China[J].Geologie en Mijnbouw,1997,76: 121～134
    [2] Ding Z L.Preliminary magnetostratigraphy of a thick eolian red clay-loess sequence at Lingtai,The Chinese Loess Plateau[J].Geophysical Research Letters,1998,8 （25）:1 225～1 228

    6. 宋友桂。六盘山东麓朝那剖面红粘土年代及其构造意义。第四纪研究。2000,20（5）:463～468[Song Yougui.Age of red clay at Chaona section near eastern LiuPan Mountain and its tectonic significance[J].Quat.Sci.,2000,20（5）:463～468]

    7. 方小敏。临夏盆地新生代地层绝对年代测定与划分[J].科学通报，1997,42（14）:1 457～1 461[Fang Xiaomin.Age-dating and classification of Cenozoic stratigraphy in the Linxia Basion.Gansu Province[J].Chinese Sci.Bull.,1997,42（14）:1 457～1 461]

    8. 李吉均。临夏盆地新生代地层古地磁年代与模式序列[A].见:青藏高原形成演化、环境变迁与生态系统研究学术论文年刊（1994）[C].北京:科学出版社，1995.91～95[Li Jijun.Amagnetic age-dating and classification of cenozoic stratigraphy in the Linxia Basion Gansu Province[A].Yearbook of scientific paper in the research of form evolution,environment changes and ecosystem of the Qinghai-Xizang Plateau （1994）[C].Beijing:Sciences Press,1995.91～95]

    9. 陈梦熊。甘肃中部之地文[J].地质论评，1947,12:545～556[Chen Menxiong.The Physiographical Stage at the center of Gansu[J].Geological Review,1947,12:545～556]

    10. 岳乐平。靖远黄土剖面磁性地层的初步研究[J].第四纪研究，1991,4:349～353[Yue Leping.Amagnetic stratigraphy study on the Jingyuan loess section,Gansu,China[J].Quat.Sci.,1991,4:349～353]

    11. 文启忠。甘肃陇西盆地的黄土[J].地理科学，1982,2（3）:202～209[Wen Qizhong.Loess of LongXi Basin in Gansu Province[J].Scientia Geographica Sinica,1982,2（3）:202～209]

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  • Received:  2001-06-28
  • Revised:  2001-10-11
  • Published:  2002-04-10

Pediment near the Western Liupan Mountain and Its Implication on the Neotectonic Uplift

  • 1. Key Laboratory of Western China's environment Systems of Ministry of education& Depart ment of geography,Lanzhou university,Lanzhou, 730000;
  • 2. Nort hwest Nor mal university,Lanzhou, 730070,China;
  • 3. Instit ute of eart h environment,Chinese Academy of Sciences,Xi'an,750054 China
  • Received Date: 2001-06-28
  • Rev Recd Date: 2001-10-11
  • Publish Date: 2002-04-10

Abstract: The late Cenozoic uplift of the Tibetan Plateau played a great role in the geomorphic and depositional evolution of its adjacent areas. This effect has brought about the Liupan Mountain at the northeastern tectonic margin of the Tibetan Plateau developed with quite different geomorphology in its two sides, resulting in large differences in wind-blown depositional environment between the eastern and western parts of the Chinese Loess Plateau. A well-preserved pediment, covered by 235 m thick loess, was recently found at the western side of the Liupan Mountain, which stands above the highest terrace of the Yellow River in the northeastern Longzhong Basin. The paleomagnetism of the loess section shows that the pediment developed at ～1.8 Ma BP, so did that of the pediments in Lanzhou-Linxia region in the southwestern Longzhong Basin. This implies that the Longzhong Basin to the west of the Liupan Mountain had been subject to long term denudation before ～1.8 Ma BP, and wight have finally developed a joined pediment or so-called Gansu Peneplain covering the whole Longzhong Basin. The large incision of the pediment and start of deposition of loess on the pediment at ～1.8 Ma BP suggest that the Tibetan Plateau and the Liupan Mountain rose strongly at that time, causing not only the end of the pediment but also the subsequent appearance of the Yellow River in the Basin.

YANG Dong, . Pediment near the Western Liupan Mountain and Its Implication on the Neotectonic Uplift[J]. Acta Sedimentologica Sinica, 2002, 20(2): 282-287.
Citation: YANG Dong, . Pediment near the Western Liupan Mountain and Its Implication on the Neotectonic Uplift[J]. Acta Sedimentologica Sinica, 2002, 20(2): 282-287.
shu

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