Age and Genesis of Alluvial Terraces in East Qilian Mountains

  • 1. Key Laboratory of Western China’s Environmental Systems, Ministry of Education, Lanzhou University, Lanzhou, Gansu 730000;
    2. Laboratory of Ice Core and Cold Regions Environment, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciznces, Lanzhou, Gansu 730000;
    3. Institute of Geographical Science and Natural Resources Academy of Sciences, Beijing 100101;
    4. Department of Geological Sciences, University of California, Santa Barbara, California 93106, USA;
    5. Institute of Marine Geology, Ministry of land and Resources, Qingdao, Shandong 266071

Received date: 2004-04-19

  Revised date: 2004-09-02

  Online published: 2005-03-20


Based on field investigation, we find that the rivers generally developed 5-6 terraces in the east Qilian Mountains during the Quaternary.According to the ESR (Electron spin resonance), TL (Luminescence), IRSL (Infra-red stimulated luminescence) and 14C dating methods, the ages of the Jinta River terraces are 1.24 Ma B.P.(T5), 0.78 MaB.P.(T4), 0.14 Ma B.P.(T3), 0.06 Ma B.P.(T2), and 0.01 Ma B.P.(T1)from up to down.The Xiying River developed 6 terraces near the Xiying Reservoir, some ages are 0.84 Ma B.P.(T6), 0.25 Ma B.P.(T4), 0.14 Ma B.P.(T3), 0.06 Ma B.P.(T2).These terrace sequences can be roughly correlated with the stepped landforms found in upstream Yellow River and Yangtze River watersheds.After careful analyses on the ages of gravel bed accumulations and the ages of channel down-cuttings, we propose that climate variations play significant roles in controlling river terrace evolutions even within the tectonic active regions.

Cite this article

GAO Hong-Shan, PAN Bao-Tian, WU Guang-Jian, LI Ji-Jun LI Bing-Yuan, DOUGLAS Burbank, YE Yu-Guang . Age and Genesis of Alluvial Terraces in East Qilian Mountains[J]. SCIENTIA GEOGRAPHICA SINICA, 2005 , 25(2) : 197 -202 . DOI: 10.13249/j.cnki.sgs.2005.02.197


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