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冰川冻土 ›› 1989, Vol. 11 ›› Issue (2): 172-176,193.

• 研究论文 • 上一篇    下一篇

贡巴冰川边缘冰碛垄特征与形成过程

康建成   

  1. 中国科学院兰州冰川冻土研究所
  • 收稿日期:1987-03-17 修回日期:1988-03-27 出版日期:1989-05-25 发布日期:2012-04-26

The Characteristics and Forming Process of Glacial Peripheral Moraines at Gongba Glaciers in Mt. Gongga

Kang Jiancheng   

  1. Lanzhou Institute of Glaciology and Geocryology, Chinese Academy of Sciences
  • Received:1987-03-17 Revised:1988-03-27 Online:1989-05-25 Published:2012-04-26

摘要: 贡巴冰川侧碛垄,内坡受到冰体前进的刮、磨,上砾石呈平行于坡面的层状排列。冰体对侧碛垄有两个方向的作用力:平行于侧碛的力表现出对侧碛内壁的“修剪”作用;垂直侧碛的力表现在冰体边缘形成剪切带,将冰内、冰下岩屑涂抹在侧碛内坡。边缘剪切带带出的岩屑与冰面岩屑一同滑向侧碛外坡,形成侧碛。终、侧碛有相似的特征和形成过程。

关键词: 贡巴冰川, 冰碛垄, 形成过程

Abstract: Based on the field observations to the glacial peripheral moraines at Gongba Glaciers in Mt. Gongga, there are differences in shapes between the younger moraines and the older ones, there are also differences at different spost. The inner-slope of lateral moraine is much steeper than the out-slope, and is pressed and abrased by the glacier.The debris becomes from less sharp to less round, in the cross sections of the lateral moraine, the debris is parallel to the out-slope surface. The grain-size analysing data show that in the inner-slope of the lateral moraine the grain-size is smaller than the out-slope, but the degree of sorting of the inner-slope is poorer than the out-slope.At the margin of glacier, the force of glacier to lateral moraine can be separated into three components, they related to the components of the velocity at the ablation area. The forces can be combined into an acting force parallel-to the lateral moraine and an acting force vertical to the moraine. The fore has a "pruning acting" to the moraine, the later forms shear plan between glacier and lateral moraine. The debris can be brought to the superglacial surface from sub-or in-glacial places, and then slips or falls on the out-slope of the moraine under the gravity. In this way, the lateral moraine is made up. In this area, there are similar characteristics and forming process between end moraine and lateral moraine.

Key words: Gongba Glaciers, moraine, characteristics, forming process