地理科学 ›› 1994, Vol. 14 ›› Issue (1): 56-63.doi: 10.13249/j.cnki.sgs.1994.01.56

• 论文 • 上一篇    下一篇

中安第斯山地冰缘地貌特征

朱诚1, A. E. 柯特2   

  1. 1. 南京大学大地海洋科学系, 南京210008;
    2. 阿根廷门多萨科学技术中心雪冰冻土研究所
  • 收稿日期:1993-03-01 出版日期:1994-01-20 发布日期:1994-01-20

PERIGLACIO-GEOMORPHIC FEATURES OF THE CENTRAL ANDES MOUNTAINS

Zhu Cheng1, Arturo E. Corte2   

  1. 1. Department of Geo and Ocean Sciences, Nanjing University, Nanjing 210008;
    2. Conicet, Cricyt, Mendoza, Argentina
  • Received:1993-03-01 Online:1994-01-20 Published:1994-01-20

摘要: 本区西侧相对湿热、冰缘带狭小、冰缘类型较少,而东侧正相反.22°-25°S的普纳高原地区以冰丘、冻丘为主,33°-35°S的多年冻土区有泥流舌、石冰川、分选环网等多种类型.本区石冰川主要为冷生型和冰川起因型,后者有一底部含水层.本区东西两侧冰缘地貌分布的差异主要是由不同气候造成的.

Abstract: The west side of the Central Andes Mountains is relatively warm and humid, its pariglacial zone is narrow and periglacial type is few;the east side vice versa. Pingos,pal-sas are main features of the Puna Plateau between 22?-25癝;gelifluction lobes,rock glacier, sorted circle and nets as well as numerous periglacial types exist in the per-mafrost region between 33?-35癝. Rock glaciers here can be divided into two types: cryogenic and glacigenic types, the latter has a glacier ice core and a subpermafrost aquifer. The periglacial distribution difference which exists between the east and west sides is caused by different climates.The distribution of rock glacier terminal and permafrost lower boundary are regu-larly of "latitudinal gradient "in the world, that is, from 25癝 southward on the southern hemisphere,the rock glacial terminal and the permafrost lower boundary descend 1000m or so with latitude increasing 10?,but the elevation only decrease 200~400m from 25癝 northward. In the northern hemisphere, from 45癗 northward to the elevation descends only 500m or so ,but from-45癗 southward it decreses 1500m and more.