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《Journal of Glaciology and Geocryology》 2005-02
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Formation Mechanism of Hummocky Moraine in the Bodui Zangbo Valley and Its Environmental Significance

YANG Wei~1, ZHOU Shang-zhe~{1, 2}, WANG Jie~1, WANG Xiao-li~1, SUN Ai-zhi~1, XU Liu-bing~1, HAN Hai-tao~1 (1. Department of Geography, Lanzhou University, Lanzhou Gansu 730000, China; 2. Department of Geography, South China Normal University, Guangzhou Guangdong, 510080, China)  
Late Quaternary Glaciations have been found in some U-shaped valleys located at Bomi County, SE China. Especially in the Bodui Zangbo valley, there are lots of hummocky moraines like tumulus. The hummocky moraines are 5~20 m high and 10~30 m wide and have high density near Lingqong about 30 km far form the existing glacier. The upper surfaces of the mounds are covered by lots of sub-rounded pebbles, showing that meltwater took part in the formation of the hummocky moraines. The insides of mounds are composed of angular granite blocks, and sometimes the internal sediments show a typical diamicton appearance with pebbles suspended in a coarse sandy matrix. The fabric and the shape of till give the evidence to prove the hummocky moraine was deposited in a stagnant ice condition and the blocks in the ice were merged out by different melt-out rate. So the mechanism of forming such a large hummocky moraine area is the combination with the large area of stagnant ice, flat base of valley and the special features of temperate glaciers. So large area of hummocky moraine suggests that glacier stagnation was more or less synchronous with climate amelioration (maybe, a temperature rising rapidly or a climate drying).
【Fund】: 国家自然科学基金项目(40371013)资助
【CateGory Index】: P931
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