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《Journal of Glaciology and Geocryology》 1982-02
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METAMORPHISM OF SEASONAL SNOW COVER IN THE UPPER REACHES OF YILIHE IN TAIN SHAN

Wang Yanlong ( Lanzhou Institute of Glaciology and Cryopedology, Academia Sinica )  
The main factors influencing metamorphism are the temperature, the temperature gradient, the pressure and the intergranular liquid water. The crystal of definite size can be formed only under a given temperature condition. For example, snow crystal of 5 - 7mm can only take shape under a temperature condition of over-5℃. The growth of depth-hoar in the snow layer is controlled by the temperature gradient with its lower limit at 0.2℃/cm, which can accelerate the speed the densification of snow cover. Affected by above factors, type of metamorphism can be classified into 3 forms:the destructive metamorphism,the constructive metamorphism, and the melting metamorphism, among which the type of constructive metamorphism is predominant.Four processes of metamorphism are as follows: temperature equalizing-densification process, temperature gra-dient-recrystalization process, alternative temperature rise and fall freeze-thaw process and temperature-rise melting process.
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【References】
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【Co-citations】
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1 Qiu Guoqing ( Lanzhou Institute of Glaciology & Cryopedology, Academia Sintca );ON ENGINEERING GEOLOGICAL SURVEY IN ALPINE PERMAFROST REGIONS OF WEST CHINA[J];Journal of Glaciology and Geocryology;1980-03
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