祁连山冷龙岭南麓的冰川序列、黄土记录和阶地系列的初步研究

A Preliminary Study on the Sequences of Glaciers, Loess Records and Terraces of the Southern Foothills of Lenlong Ling in Qilian Mountains

已经发现的冰川沉积和黄土记录证明冷龙岭至少经历了３次冰期的冰川作用，其中倒数第３次冰期与沉积黄土Ｌ４（或Ｌ５）的时期相当，其时冰川规模最大，随后各个冰期冰川规模逐渐变小．即使在倒数第三次冰期，冰川末端也只到达冷龙岭南侧门源盆地的边缘，未能覆盖整个盆地形成冰盖；门源盆地南侧发育的５级大通河阶地与分布于盆地中的５级冰水（扇）阶地以及盆地北侧的５套冰碛可以进行对比，它们记录了自倒数第三次冰期以来门源盆地的冰川作用，河流发育与地貌演化。

The discovered glacial deposits and loess records prove that there were at least 3glaciations in Lenglong Ling. The third-from-the-last galciation which was the largest one can be correlated to L4 (or L5) in loess profile. The extent of glaciation decreased gradually thereafter. Even in the third-from-the-last glaciation, the ends of glaciers only reached the edge or the basin, without the formation of large ice sheets. The 5 river terraces in the south of the basin can be compared with the 5 glacial-fluvial terraces (fans) in the basin. They were the records of glaciation, river development, geomorphological evolution in the Basin from the third-from-the-last glaciation.