Acta Geographica Sinica ›› 2002, Vol. 57 ›› Issue (3): 310-318.doi: 10.11821/xb200203007

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Response of Landform Development to the Tectonic Movement and the Climate Changes in Fenhe Drainage Basin

HU Xiaomeng1, FU Jianli2, LI Youli2   

  1. 1. The Urban and Tourism School, Shanghai Normal University, Shanghai 200234, China;
    2. Department of Urban and Environmental Science, Peking University, Beijing 100871, China
  • Received:2001-06-04 Revised:2001-09-26 Online:2002-05-25 Published:2002-05-25
  • Supported by:

    National Natural Science Foundation of China,No. 40071016


Based on analysis of the characteristics of the terraces in patterns and sediment of the Fenhe drainage basin, we find it was the three tectonic uplifts that caused the formation of three-level terraces. These uplifts took place at 0.76 MaBP, 0.55 MaBP and 0.13 MaBP respectively and resulted in the three low-level stages of the paleolake in consistent with the development of S8, S5, S1 in time. Compared with the neotectonic movements in the upper reaches of the Yellow River, the three tectonic uplifts in this region are in correspondence with them, and this may imply that the neotectonic uplifts of the Qinghai-Tibet Plateau strongly controlled the tectonic movements in the Fenhe drainage basin. According to the features of laustrine sediment deposited from the time when S5 ended its formation to the time when S1 began to develop, we also find the changes in paleoclimate from dry to wet influenced the development of the paleolakes. The lake levels rose when it was wet and dropped when it was dry, but the extent of this change of the lake levels was no more than 4.5 m, and much smaller than that caused by tectonic moveme.

Key words: alluvial-lacustrine terrace, CaCO3, loess-paleosol series, dating of Quaternary, response of landform