宣化盆地辛庄子黑砂土剖面研究

A RESEARCH ON THE BLACK SANDY SOIL PROFILE AT XINZHUANGZI IN XUANHUA BASIN, HEBEI PROVINCE

采用扫描电镜观察及理化分析技术 ,从辛庄子沙丘黑砂土剖面中提取出古气候信息 ,综合研究得出 :在 110 0 0～ 830 0aBP期间 ,本区经历了 2个大的气候阶段 ,即 110 0 0～ 10 0 0 0aBP的相对干旱期和 10 0 0 0～ 830 0aBP的相对湿润期 ,但湿润程度不及 80 0 0～ 6 0 0 0aBP .

The paleoclimatic records in the black sandy soil and dune sands are obtained by means of sedimentary chemical analysis and scanning electron microscope observation. The results show that: the investigated region has experienced two climatic stage in 11 000～ 8 300 aBP, i.e. a relatively arid period of 11 000～10 000 aBP and a relatively humid period of 10 000～8 300 aBP, which can be well consilient with the climatic fluctuation in the same time in North China.