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冰川冻土 ›› 1984, Vol. 6 ›› Issue (2): 53-60.

• 研究论文 • 上一篇    下一篇

祁连山新冰期冰碛的初步观察

伍光和   

  1. 兰州大学地质地理系
  • 收稿日期:1983-05-30 出版日期:1985-05-25 发布日期:2012-04-26

A Preliminary Obseryation on Neoglaciation in Qilian Mountains

Wu Guanghe   

  1. Department of Geology and Geography, Lanzhou University
  • Received:1983-05-30 Online:1985-05-25 Published:2012-04-26

摘要: 末次冰期后的世界气候虽有过几次冷暖交替,但总的说来是以温暖时期为主的。亚北极期和前北方期气温诚然不够高,但实际上标志着转暖的早期阶段;北方期、大西洋期和亚北方期则是冰后期气温最高的阶段。末次冰期残留的多数中低纬山岳冰川,尤其是小冰川,在这个持续很久的高温时期中全部消失。后来气候再度转冷,山岳冰川重新生成或扩大。这就是很多学者叫做新冰期的时代。

Abstract: A group of glacial deposit distributed widely in Qilian Mountain region has been researched and discussed in this paper. These moraines have kept their complete form, but were weathered strongly. The upper part of the moraines is covered by the recent till, while the lower part has inlaid on the base rock of the floor of the U-shaped valley, and came into and across the main U-shaped valley from branch valleys. Based on these facts,the author points out that this glaciation occurred after Wurm period, i. e. after a strong process of uplifting movement in neotectonic, after a strong exogenetic process of cutting,after a strong climatic change in hypsithermal interval, and after a long little interglacial stage lasted several thousand years in glacial history. Therefore,it should be an independent glaciation. The author is of the opinion that it would belong to a neoglaciation,which is proved by C14 chronology.This paper also points out that this neoglaciation spreads widely throughout all Qilian Mountains. The properties of the glaciation are similar to the modern glaciers,but with a length 1-4 km longer and a snowline 200 m lower than modern glaciers.Most glaciers in neoglaciation are not remains of the Later-Pleistocene and most of the existing glaciers are neither neoglacial remains. They take form in the recent 300-400 years.