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The Periglacial Blow-Sand Landform and Sediment: a Review

LI Xin~1, LI Xiao-ze~1,2, YI Chao-lu~3, ZHU Zhi-yong~3(1.Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Acdemy of Sciences,Lanzhou Gansu 730000,China;2.Key Laboratory of Western China′s Environmental Systems,Ministry of Education,Lanzhou Gansu 730000,China;3.Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100085,China)  
The periglacial Aeolian landform and deposition is the desert physiognomy formed by the blown sand under cold and arid environment,always accompanied with the impact of glaciers and freezing and thawing.Most modern periglacial deserts are distributed mainly in the high latitude or middle and low latitude regions with high altitude.Whereas,some ancient periglacial sandy deserts depositions are distributed in modern temperate deserts.Usually the scales of periglacial dunes are smaller.The periglacial dune deposits are with abundant organism,ice flakes,freeze-thawing structure and firn stratum.Also,the sand has low chemical and physical maturity.The periglacial aeolian sediment coexists with some other facieses such as loess deposition,glacier deposition,lake deposition,deep sea deposition and volcanic clastic depositions etc.Therefore,they can be used to reconstruct local ancient climate and environments.Also they provide references to research the evolution of modern temperate desert during the Glaciation period.Recently,much achievement has been acquired in this field.However,it is hard to make certain the causes and processes of the paleo-periglacial and periglacial deserts due to the immature theory,more work should be carried out.The Pruogangri periglacial sandy desert and gobi,located in the hinterland of the Tibetan Plateau,is the typical one in China.Studies on these landforms and environmental processes can enrich the contents of sandy deserts and play an important role in understanding the local climate and environment changes since the Late Quaternary.
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