【摘要】 在汾河下游第四纪地质剖面观察的基础上 ,选择了具有代表性的洪洞三交河左木剖面 ,利用沉积物相变方法 ,对沉积物进行分析 .认为汾河下游三万年以来环境有四次大的变化 ,其中后两次变化 ,时间分别为 8Ka- 2 .5Ka B.P和 2 .5Ka以来 ,共有 5次小的波动 ,由此推测 ,今后百年内气候继续变暖 ,波动周期为 30 a- 40 a.更多还原

【Abstract】 Based on the observation of Quaternary geological profiles in lower reaches of Fenhe, this paper chooses the representitional Zuomu profile in Sanjiaohe Hongtong to analyse deposition by means of changes of its corresponding environment. There were 4 major changes in the area for the last 30Ka, the last 2 of which happened separately in 8Ka—2.5Ka B.P. and 2.5Ka—now with 5 little fluctuations. From these, it can be concluded that climate will be warmer in the 100 years, whose cycle is 30—40 years.更多还原