地理科学

地理科学 ›› 2005, Vol. 25 ›› Issue (2): 197-202.doi: 10.13249/j.cnki.sgs.2005.02.197

• 论文 • 上一篇    下一篇

祁连山东段河流阶地的形成时代与机制探讨

高红山1, 潘保田1, 邬光剑2, 李吉均1, 李炳元3, Douglas Burbank4, 业渝光5   

  1. 1. 兰州大学西部环境教育部重点实验室和地理科学系, 甘肃, 兰州, 730000;
    2. 中国科学院寒区旱区环境与工程研究所冰芯与寒区环境重点实验室, 甘肃, 兰州, 730000;
    3. 中国科学院地理科学与资源研究所, 北京100101;
    4. Department of Geological Sciences, University of California, Santa Barbara, California 93106, USA;
    5. 国土资源部青岛海洋地质研究所, 山东, 青岛, 266071
  • 收稿日期:2004-04-19 修回日期:2004-09-02 出版日期:2005-03-20 发布日期:2005-03-20
  • 基金资助:
    国家自然科学基金项目(40171010);教育部博士点基金项目(20030730017);教育部青年教师奖励基金(教人司2000-26)资助。

Age and Genesis of Alluvial Terraces in East Qilian Mountains

GAO Hong-Shan1, PAN Bao-Tian1, WU Guang-Jian2, LI Ji-Jun LI Bing-Yuan1, DOUGLAS Burbank3, YE Yu-Guang4   

  1. 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:2004-04-19 Revised:2004-09-02 Online:2005-03-20 Published:2005-03-20

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被引次数

41

摘要： 第四纪期间祁连山东段发育了多级洪积台地与河流阶地,它们是研究区域构造活动与气候变化良好的载体。对该区主要河流阶地序列的野外考察,利用ESR、TL、IRSL以及14C等测年方法,研究表明,第四纪期间石羊河上游的各大支流普遍发育了5-6级阶地,其中南营村附近金塔河五级河流阶地的形成时代大致为1.24MaB.P.(T5)、0.78MaB.P.(T4)、0.14MaB.P.(T3)、0.06MaB.P.(T2)和0.01MaB.P.(T1),完全可以与该区沙沟河、黄河兰州段以及长江三峡段的阶地序列相对比。从各级阶地砾石层的堆积时代以及阶地的沉积特征分析,我们认为,即使在构造活动区域,气候变化在河流地貌演化过程之中起着重要的控制作用。

Abstract: 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.

中图分类号: 

  • P593