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Red clay sediment in the central Chinese Loess Plateau and its implication for the uplift of the Tibetan Plateau

  • Song Yougui Email author
  • Li Jijun 
  • Fang Xiaomin 
  • Xia Fei 
  • Dong Hongmei 
Article

Abstract

The widely distributed red clay sediment underlying the Chinese Loess Plateau truly records the Neogene environmental evolution, and its genesis and development are intrinsically related to the uplift processes of the Tibetan Plateau and the evolution of East Asia monsoon system. In this paper, a detailed magnetostratigraphy of a loess-red clay section (107°13′E, 35°02′N) from the central Loess Plateau is reported. The loess-red clay sequence is composed of 175 m Quaternary loess-paleosol sequence and 128 m Neogene red clay sediments. Based on the correlation with the standard geomagnetic polarity time scale, the paleomagnetic results indicate that the age of Chaona red clay sequence extends to 8.1 Ma, which is the older red clay deposition in the central Chinese Loess Plateau. The commencement of red clay at ∼8.1 Ma may imply that the Ordos planation surface was broken by the movement of the Haiyuan-Liupanshan Faults, which was related to the uplift of the Tibetan Plateau induced by the collision of India Plate and Eurasian Plate. And the western part adjacent to the Tibetan Plateau was uplifted to form the embryo of the Liupan Shan (Mts.) and the eastern part was down-faulted to receive red clay deposition. We link this faulting to an initial uplift of the Tibetan Plateau. The undulating nature of the broken Ordos planation surface may explain the chronological differences and depth discrepancies among various cross-sections of red clay.

Key Words

Loess-paleosol red clay sequence magnetostratigraphy planation surface geological significance 

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Copyright information

© Institute of Moutain Hazards and Environment, Chinese Academy of Sciences and Science Press 2005

Authors and Affiliations

  • Song Yougui 
    • 1
    • 2
    Email author
  • Li Jijun 
    • 2
  • Fang Xiaomin 
    • 2
  • Xia Fei 
    • 3
  • Dong Hongmei 
    • 4
  1. 1.State Key laboratory of Loess and Quaternary Geology, Institute of Earth EnvironmentChinese Academy of SciencesXi’anChina
  2. 2.MOE National Laboratory of Western China’s Environmental Systems & Department of GeographyLanzhou UniversityLanzhouChina
  3. 3.Department of GeosciencesEast China Institute of TechnologyFuzhouChina
  4. 4.Xi’an University of Science and TechnologyXi’anChina

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