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冰川冻土 ›› 1983, Vol. 5 ›› Issue (4): 71-74.

• 研究论文 • 上一篇    下一篇

西藏东南部波堆藏布谷地的基碛丘陵

杨逸畴   

  1. 中国科学院登山考察队
  • 收稿日期:1983-01-06 出版日期:1984-08-25 发布日期:2012-04-26

Basal Moraine Hills at Boduizangbu Basin in the Southeastern Tibet

Yang Yichou   

  1. Mountaineering and Scientific Expedition, Academia Sinica
  • Received:1983-01-06 Online:1984-08-25 Published:2012-04-26

摘要: 基碛丘陵是冰川消融后,原来的表碛、内碛、中碛都沉落到底碛之上形成的波状起伏的丘陵地形,多成片分布。其形态与分布规律和物质结构往往受冰前古地形和原来冰面形态的影响。据所知,我国基碛丘陵在西藏希夏邦马峰山麓亦有存在。

Abstract: In general, basal moraine hills, typical landform of ablation drift occur only in continental glaciated area. However, large stretches of them are found well preserved in the bed of glaciated U-shaped valleys of Boduizangbu basin in Southeastern Tibet, scattering on the inner side of the terminal moraines remained from the last glaciation of Late Pleistocene. From lower stream upward basal moraine hills increase both in number and in size, and connect one with another in the uppermost part. They consist of boulders, pebbles and coarse sand etc. all mixed up, and some-boulders and pebbles are quite rounded, showing that such basal moraines are ablation moraines of maritime glaciers in rapid retreat from gentle and broad valleys under action of fluvioglaciation. Basal moraine hills in this area are important in the study of both glaciology and exploration of sand ores.