乾宁古冰帽的发现及意义

Discovery and Signaficance of Qianning Ancient Ice Cap

乾宁古冰帽于1982年被作者发现,发育于大雪山顶部的夷平面上,海拔高度为4300～4400 m,地理坐标为101°14′～101°30′E,30°20′～30°38′N,是青藏高原位置最东、海拔最低的一个更新世古冰帽,生成环境独特。它还具有中心区缺少冰蚀过程遗迹的独特性质,其机理在于冰帽中心区冰层太薄、动能低、冰体侵蚀力弱,而边缘带冰层增厚。侵蚀力也增强。它的发现对进一步探讨青藏高原第四纪冰川问题具有重要意义。

The Qianning Ancient Ice Cap was discovered in 1982 by author. It was formed on the peneplain of Daxueshan Mountain, which belonged to the second ice epoch counted backwards in the Pleistocene. The ice cap is located in the eastest and lowest part of Qinghai-Xizhang Plateau. The height is only 4300 - 4400 meters above sea-level and the geography coordinate is 101°14′- 101°30E and 30°20′- 30°38′ N. Therefore, this is a special enveronment in the whole plateau. It has the special feature that there is short of ice erosion remains in the central region of the ice cap and there are lot of the landforms of erosion and deposition in outside of the ice cap, for example the glacial valleies and glacial lakes. Way? Because the ice layer of the center of the ice cap was too thin so that there was no enough power to erosion, and where was thick in the outside and the erosion power was strong. Therefore, it is a new type of ice cap in the Qinghai-Xizhang Plateau or in the world even. It's discovery has an important value to study Quaternary glacier of the Qinghai-Xizhang Plateau.