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《Journal of Glaciology and Geocryology》 2008-01
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The Discovery of Ice-wedge Casts in Erdos:Rebuilding the Permafrost Boundary during the Penultimate Glaciation in China

ZHOU Tian,PAN Bao-tian,LIU Xiu-ju,SU Huai,HU Zhen-bo(Department of Geography,Key Laboratory of Western China's Environmental Systems,MOE,Lanzhou University,Lanzhou Gansu 730000,China)  
In this paper,the ice-wedge casts found in Erdos plateau were described in detail.As an evidence for reconstructing paleotemperature,periglacial geomorphological phenomena,ice-wedge casts were considered to be an important factor in paleoenvironmental research for a long period.From the TL dating and sediment analysis of the wedges,it is confirmed that the ice-wedge casts found in Erdos developed in the period of Penultimate Glaciation.According to the characteristics and the distribution of these ice-wedge casts,the permafrost boundary during the Penultimate Glaciation in China was reconstructed and the paleotemperatures on the boundary were estimated based on the correlative formulas among geographic factors.This boundary was divided into three parts;the east part,the middle part and the west part,respectively.Chiefly based on latitude,the east part of the boundary was located in the area east to 118° E and near 40°20′ N,and the middle one between 105° E and 118° E and to 36°33′ N southwards.Chiefly based on height,the west part was located at 2 000—3 100 m in the area west to 105° E.In addition,the mean annual air temperature of the entire boundary during the Penultimate Glaciation is estimated to be 10~15 ℃ lower than the temperature nowadays.
【Fund】: 国家重点基础研究发展计划(973计划)项目(2005CB422001)资助
【CateGory Index】: P343.6;P642.14
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