Temporal and Spatial Variations of the Loess Accumulation Rate and Its Significance on the Loess Plateau During Quaternary

Wu Haibin; Chen Fahu; Wang Jianmin

The loess accumulation rates of Liujiapo, Luochuan，Xifeng,Baoji,Jiuzhoutai and Dadunling sections onthe loess plateau were systematically studied in this paper. It was found that the loess accumulation rates have increased step by step from past to present,and decreased from NW to SE in thesame fashion,besides the variation from glacial to interglacial epoches. There were several periods of extremelyhigh rates of the loess accumulation during Quaternary，which are coincided with the uplift events of theQinghai一Tibetan Plateau. At about 0. 7 MaBP，the winter monsoon had a remarkable change both in winddirection and intensity. Since then，the intensity of winter monsoon has become stronger and stronger,whilethe direction of winter monsoon has changed to northwest. This paper proved that the loess accumulation ratecan beconsidered as one of the best indices to indicate the winter monsoon variations of the Loess Plateau.

Department of Geographical Science Lanzhou University Lanzhou 730000

Received Date: 1997-04-18

Rev Recd Date: 1997-11-19

Publish Date: 1998-03-10

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Abstract: The loess accumulation rates of Liujiapo, Luochuan，Xifeng,Baoji,Jiuzhoutai and Dadunling sections onthe loess plateau were systematically studied in this paper. It was found that the loess accumulation rates have increased step by step from past to present,and decreased from NW to SE in thesame fashion,besides the variation from glacial to interglacial epoches. There were several periods of extremelyhigh rates of the loess accumulation during Quaternary，which are coincided with the uplift events of theQinghai一Tibetan Plateau. At about 0. 7 MaBP，the winter monsoon had a remarkable change both in winddirection and intensity. Since then，the intensity of winter monsoon has become stronger and stronger,whilethe direction of winter monsoon has changed to northwest. This paper proved that the loess accumulation ratecan beconsidered as one of the best indices to indicate the winter monsoon variations of the Loess Plateau.

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Temporal and Spatial Variations of the Loess Accumulation Rate and Its Significance on the Loess Plateau During Quaternary

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