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DISCUSSION ON THE TIME OF FORMATION OF PERMAFROST ON QINGZANG PLATEAU

Zhang Yong, Cai shi quan (First Hydro-geological and Engineer - geological Team of Goelogicael Breau, Qinghai Province )  
Since the distribution of permafrost on Qingzang Plateau is far from the fundamental Polar tundra zone, the permafrost on the Plateau has its own series of characteristics. This article deals mainly with the time of its formation, and at the same time its genesis and development tendency. Through the discussion of above mentioned questions. the formation of permafrost on the Plateau is principally due to the influence of intense cold climate in this very high local relief following the large scale intensvie uplift of the earth crust in recent geological period. It is quite possible that the period of its formation might be very new, beginning from the modern Little lce Age, only an event of late 5000 years, At present, it might be a special exception in the history of genesis and development of permafrost at large area on the earth
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