陕西榆林地区古风成沙地层中化学元素含量变化与气候环境

本文根据陕西榆林地区古风成沙地层中化学元素的含量变化和地层岩性特征.讨论了该区更新世以来的气候变化规律,初步得出以下三点结论:1.第四纪以来,榆林地区的气候明显较东南部地区干冷。2.该区第四纪以来.气候经历了16个湿热——干冷变化周期.中更新世以来的14个变化周期与陕西洛川剖面所代表的气候变化周期几乎完全一致.3.该区气候发展变化的总趋势似乎是愈来愈干冷.

The Content Changes of Chemical Elements in the Loess Section of Eolian Sands and the Climatic Environments in Yulin Region,Shaanxi Province

According to the content changes of chemical elements in the loess section of eolian sands and the lithologlcal characters of stratum, the regularity of climatic changes since Pleistocene in Yulin Region, Shaanxi Province has been discussed in this paper, three points of conclusions have been reached as tollows:Ⅰ.The climate in Yulin region has been obviously drier and colder than that in the southeastern region of Shaanxi Province since Quaternary Period. Ⅱ. The climate in this region has experienced in 16 changing periods of humid and warm-dry and cold sinca Quaterinary 14 changing periods si-nee Mid Pleistocene is almost unanimously with that represented by the loess section in Luochuan, Shaanxi. Ⅲ. The changing trend of climate in this region is seemed to be more dry and cold.