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《Journal of Glaciology and Geocryology》 1987-01
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Grain-size Characteristics of Glacial Debris, and Explanation of the Processes of Glacial Tran-sports and Sediments at the Gongba Glaciers in Mt. Gongga

Kang Jiancheng ( Lanzhou Institute of Glaciology and Geocryology, Chinese Academy of Sciences )  
By analyzing the grain size data of the glacial debris samples ( super glacial, shear belt and regelated bed debris)and some till at Gongba glaciers, their characteristics are expounded. It is found that grain size statistical parameters and grain degree distribution have some regular changes from upper glaciers to lower ones. According to field observations, the paper points out that these regular changes reflect that glacial crushing, abrasion and transportation processes are different. Glacial crushing and abrasion gradually make average grain size become small, degree of sorting better and deviation small, but the other agents in the transportation process are simultaneously breaking these trens. Therefore glacial debris could be divided into glaciated debris and glacial transportation debris. The force is exerted by glacial crushing and abrasion, and the later is only carried by glaciers. The tills are direct sediments of glacial debris. Therefore, the longer the transport distance is, the better the sorting degrees of tills. One of the reasons for the tills being diamict is the result of glacial debris mixtures of different formation and glaciated degrees. By discussing grain-size characteris ticsof regelated bed debris, the article indecates that in the press-melting process, melted water affects finer grain parts in till to a larger degree.
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