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Journal of Mountain Science

, Volume 2, Issue 3, pp 193–201 | Cite as

Ice-wedge casts showing climatic change since the late pleistocene in the source area of the Yellow River, northeast Ribet

  • Cheng Jie Email author
  • Zhang Xujiao 
  • Tian Mingzhong 
  • Yu Wenyang 
  • Yu Jiangkuan 
  • Tang Dexiang 
  • Yue Jianwei 
Article

Abstract

The source area of the Yellow River is located in the northeastern Tibetan Plateau, and is a high-elevation region with the annual mean temperature of −3.9°C. The ice-wedge casts discovered in this region are recognized as two types. One was found in sandy gravel beds of the second terrace of the Yellow River. This ice-wedge cast is characterized by higher ratio of breadth/depth, and are 1–1.4 m wide and about 1 m deep. The bottom border of the ice-wedge cast is round arc in section. Another discovered in the pedestal of the second terrace has lower ratio of width/depth, and is 0.3–1.0 m wide and 1–2 m deep. Its bottom border is sharp. Based on the TL dating, the former was formed at the middle Holocene (5.69 ± 0.43 ka BP and 5.43 ± 0.41 ka BP), that is, the Megathermal, and the latter was formed at the late Last Glacial Maximum (13.49 ± 1.43 ka BP). Additionally, the thawing-freezing folders discovered in the late Late Pleistocene proluvium are 39.83 ± 3.84 ka BP in age. The study on the ice-wedge casts showed that the air temperature was lowered by up to 6–7°C in the source area of the Yellow River when the ice-wedge casts and thawing-freezing folds developed.

Key Words

Ice-wedge cast paleoclimate Last Glacial Age Megathermal the source area of the Yellow River Tibetan Plateau 

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Copyright information

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

Authors and Affiliations

  • Cheng Jie 
    • 1
    Email author
  • Zhang Xujiao 
    • 1
  • Tian Mingzhong 
    • 1
  • Yu Wenyang 
    • 1
  • Yu Jiangkuan 
    • 1
  • Tang Dexiang 
    • 2
  • Yue Jianwei 
    • 3
  1. 1.China University of GeosciencesBeijingChina
  2. 2.Institute of Process EngineeringChinese Academy of SciencesBeijingChina
  3. 3.Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingChina

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