摘要
首次研究长江三角洲地区晚第四纪古土壤的地球化学特征。本区第一“暗绿色硬粘土层”的硅铝率在２．８０～３．３７之间，说明该层已经发生了较强的土壤化作用，可以确定为古土壤。古土壤层土体样品与胶体样品的化学全量分析结果之间有很大的差异，只能用胶体样品来研究古土壤特征。在古土壤中，ＳｉＯ２、Ａｌ２Ｏ３、ＭｇＯ、ＴｉＯ２、Ｋ２Ｏ相对积聚，而Ｆｅ２Ｏ３、ＣａＯ、ＭｎＯ、Ｎａ２Ｏ、Ｐ２Ｏ５相对淋溶。在剖面上。
For the first time,the geochemical characteristics of the socalled first 'Dark Green Stiff Clay Layer' in the Yangtze River Delta area are studied using the core samples of LA Core by paleopedological research methods. The molecular ratio of SiO2/Al2O3 of this layer is 2.80￣3.37, indicating that this layer has been strongly pedogenticly altered. There are notable differences between the chemical analysis results of clay samples and wholerock samples, therefore, only the clay samples can be used to study the characteristics of paleosol. It is discovered that SiO2, Al2O3, MgO, TiO2, and K2O relatively accumulated while Fe2O3, CaO,MnO, Na2O and P2O5 relatively eluviated in the paleosol. Based on the chemical analysis data, the authors conclude that this special layer is of paleosol, and the climate was becoming humid during its formation.
出处
《青岛海洋大学学报（自然科学版）》
CAS
CSCD
1998年第1期129-134,共6页
Journal of Ocean University of Qingdao
基金
国家自然科学基金
青岛海洋大学博士启动基金
关键词
长江三角洲
晚第四纪
古土壤
地球化学
Yangtze River Delta
Late Quaternary
paleosol
geochemistry
