希夏邦马峰北麓佩枯错湖堰塞成因的解释

An Explanation of the Dam of the Peikucuo Lake in the North Slope of Mt. Xixiabangma

根据对希夏邦马峰北麓佩枯错湖区古湖岸的升降变化、门曲谷地河流阶地和冰水阶地等的实地考察，以及地形图、卫片、航片判读所取得的资料，并结合本区第四纪以来不同时期的上升幅度、古地理变迁、冰期与间冰期更替、动植物演进等方面的研究成果，发现希夏邦马峰北坡第四纪不同时期的冰水相沉积物，曾对门曲谷地有过不同程度的堰塞作用，故而提出佩枯错湖为堰塞成因的解释，其从初始形成、兴盛发育到衰退的演变过程与区内冰川类型从山谷冰川、山麓冰川到山谷冰川的演替过程是一致的．

Based on in situ investigation on elevation variation of palaeo-lake bank of the Peikucuo Lake, river valley terraces and glacio-fluvial terraces of the Menqu River in the north slope of Mt. Xixiabangma, and combined with interpretation of topographic map, satellite and air photoes, this paper refers and confirms the uplifting scale in different period, variation of palaeo-geographic environment, change of glaciation and inter-glaciation, evolution of animals and plants since the Quaternary. During the Quaternary, the glacio-fluvial deposits in the north slope of Mt. Xixiabangma has blocked the Menqu River valley and formed Peikucuo barrier lake. Evolution of the lake corresponded to the change processes of glacier types from valley glacier, piedmont glacier to valley glacier.