地理学报 ›› 1988, Vol. 43 ›› Issue (2): 127-133.doi: 10.11821/xb198802004

• 论文 • 上一篇    下一篇

陕西北部榆林第四纪地层剖面的粒度分析与讨论

李保生, 董光荣, 高尚玉, 丁同虎, 邵亚军   

  1. 中国科学院兰州沙漠研究所
  • 出版日期:1988-04-15 发布日期:1988-04-15

ANALYSIS AND DISCUSSION ON THE GRAIN SIZE OF THE QUATERNARY STRATA PROFILE IN YULIN AREA OF THE NORTHERN, SHAANXI

Li Baosheng, Dong Guangrong, Gao Shangyu, Din Tonghu, Shao Yajin   

  1. Lanzhou Institute of Desert, Academia Sinica
  • Online:1988-04-15 Published:1988-04-15

摘要: 本文根据榆林剖面及其粒度分析结果,讨论了剖面中地层的沉积相、古气候和环境演化。

关键词: 榆林剖面, 黄土, 古土壤, 粒度, 沉积相, 古气候

Abstract: The Quaternary Strata profile and its variations of grain size in Yulin area reveal that: the layers of sand, loess, and palaeosol in the profile were respectively formed by wind for-ce and the action of soil formation on the parent materials of aeolian sand and loess.Since the early Quaternary, the Ordos Plateau has alternately undergone 11 stages of the depositions of shifting sands under extreme cold-dry climatic conditions, 7 times of fixed-semifixed dunes and 8 times of dust (loesses) under cold-dry climatic conditions; and that of the action of soil formation under 15 times of warm-wet climate and 3 times of temperate-wet climate (drab soils and black loams formed respectively).

Key words: Yulin profile, loess, palaeosol, grain size, sedimentary facies palaeo-climate