摘要
晚第四纪以来祁连山冷龙岭南坡经历过两次大的冰川作用。第一次冰川前进期在140000aB.P.之前,形成山麓冰川。第二次即末次冰期,有两个冰川前进期,分别为38 000aB.P.之前和38000—18000aB.P.之间,在14000—12660aB.P.有一个冰川后退中的停顿期;冰川类型为宽尾山谷冰川、山谷冰川和冰斗冰川;雪线下降值在600m左右。由研究可得,晚第四纪以来,该区没有形成过Kuhle假定的大冰盖。
During late Quaternary two glaciations on the south slope of Lenglongling, Qilian Mountains are recognized. The first main glacier advancing occurred before 140 000 a B.P. in the form of piedmont glacier. The second, i.e, the last glaciation, there were two glacier advancings occurred separately before 38000 a B.P., and between 38000-18000 a B.P.. Among 14 000-12 660 a B.P., a short-term stop occurred in the deglacial process. During the last glaciation, the glacier types were wide-tail valley glacier, valley glacier and cirque glacier; the depression of snowline was about 600 m lower than today.
Based on the date from 14C dating, research of geomorphical stratigraphy and loess stratigraphy, there was no 'large ice sheet' claimed by M. Kuhle, formed in this studing area during late Quaternary.
出处
《冰川冻土》
CSCD
北大核心
1992年第4期352-359,共8页
Journal of Glaciology and Geocryology
关键词
晚第四纪
冰川
演化
祁连山
Mt. Qilian, Late Quaternary Glaciation, geomorphical stratigraphy, loess stratigraphy
