收藏设为首页 广告服务联系我们在线留言

干旱区地理 ›› 1990, Vol. 13 ›› Issue (3): 75-79.doi: 10.13826/j.cnki.cn65-1103/x.1990.03.015

• • 上一篇    下一篇

西北干旱环境始于何时

徐叔鹰   

  1. 苏州铁道师范学院
  • 出版日期:1990-09-25 发布日期:2025-12-25

WHAT TIME WAS BEGUN ARID ENVIRONMENT IN THE NORTH-WEST OF CHINA

Xu Shuying   

  1. Suzhou Railway Teachers’ College
  • Published:1990-09-25 Online:2025-12-25

摘要: 湖泊、黄土、沙漠及动植物群等第四纪发展历史表明, 西北现代干旱环境并非始自第三纪末第四纪初, 而是从距今1.4~1.2百万年的第四纪中期开始, 其原因在于青藏高原及西北诸大山系上升的年青性与加速性。

关键词: 干旱环境, 第四纪, 古地磁测年, 构造运动

Abstract: Quaternary history of lakes, loess, deserts, Vegetation and paleo-fauna ete. makes known that arid environment in the North-West of china was begun at middle stage of Quaternary period (1.4-1.2 M. Y. B. P), was not begun from last stage on Tertiary pcriod to early stage of Quaternary period. The cause lie in young and guicking quality of the uplift of the Qinghai-Xizang Plateau and high mauntains in the North-West of China.