摘要
通过野外考察及地质地貌剖面解析,对云南点苍山的地貌发育作了分析研究,并对罗坪山丽江期古冰川作用作了初步探讨。结果认为:点苍山的地貌是一种多元化、多层次、聚变式的多层地貌组合。其地貌发育系统自山顶到坡脚分为古夷平面解体过程,古冰川与冰缘作用,流水作用,古冰川漂砾、洪积、冲积、泥石流、水石流等混杂堆积,山麓阶地与滨湖平原发育过程;点苍山发育了二次冰期,即未次冰期(大理冰期)和倒数第二次冰期(丽江冰期),是中国大陆发育古冰川的最南界;比苍山主峰海拔低800m的罗坪山发育了倒数第二次冰期,出现了复合型山岳冰川。
The research on geomorphological development and palaeo glacier is an important field in geomorphology and quaternary study. Through the detailed field expedition and the analysis of geological and geomorphological profiles, the geomorphological development of the Diancangshan mountain is studied, while the plaeo glaciations of the Luopingshan mountain in Lijiang epoch is probed. The basic conclusions are as follows: 1) The landform of the Diancanghshan mountain is characterized by its multielement, multi-layer and compound features. Its geomorpjological development processes from the mountain top to the foot are: The disintegration process of palaeo plantation surface(3800～4000m); Palaeo glacier and glacier marginal process(3700～3900m); Alluvial action process(2300～3700m);Mixed accumulation process caused by fluvial, debris flow and water flow actions(2100～2300m); Terraces of pediments and lake shore plain action at the mountain foot(1900～2100m). 2) The Diancangshan mountain has developed two-time glaciations which are Dali glacier epoch and Lijiang glacier epoch. They are located at the southernmost limits of the continental glaciers in China.3) Lijiang glacier epoch ever developed on the Luopingshan mountain, which is 800m lower than the Diancangshan mountain, and there a couple of compound mountain glaciers have been found.
出处
《热带地理》
2003年第4期304-308,共5页
Tropical Geography
基金
国家自然科学基金项目(49661004)
国家自然科学基金项目(49971022)
中国科学院寒区
旱区环境与工程研究所创新项目(CACX210091)
云南省自然科学基金项目(2002C0015R)
关键词
垂直地貌发育
第四纪
古冰川作用
云南点苍山-罗坪山地区
地质地貌
Geomorphological development
Palaeo glaciations in quaternary period
Diancangshan-Luopingshan mountains in western Yunnan
