The perennial frost in the Southern Qinghai-Northern Xizang area belongs to a kind of low to middle latitude and high elevation type. Its formation is the result of numereous factors over a long period. The essential factor is new tectonic movement, and the next is the variation of quaternary climate.
Recently preserved perennial frost of this area is formed in the beginning of the early Zhajia-zangbu Glacial epoch of late pleistocene. Afterwards, although the climate returns to warm here as well a...
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