长江三角洲晚第四纪埋藏古土壤及成土母质

Late Quaternary Buried Paleosols and Their Parent Materials in the Yangtze Delta

长江三角洲晚第四纪第一硬粘土层具有裂隙和微裂隙、粘化层和粘粒胶膜、植物根系和植物碎石、土壤结构体和新生体等古土壤特征，应为古土壤层．由古土壤层中粘土矿物组合，硅铝率（２．８～３．７）和硅铁铝率（２．０～２．９）以及潴育特征推断它为潮土（草甸土），成土母质为河漫滩沉积，沉积磁组构Ｑ，Ｐ，Ｌ，Ｆ值对比分析，得出了相同的结论．

The first stiff clays in late Quaternary strata of Yangtze Delta are considered to be paleosols by their characteristics, such as cracks and fine fissures,plant debris and roots, peds and soil new formations, etc. It is inferred from their clay mineral types, siallitic ratios(2. 8￣3. 7), silica -- sesquioxide ratios(2.0￣2. 9)and gleying characteristics that they are of moadow--soil--type paleosols and their parent materials arc flood land sediments. Comparison analyses of their magnetic fabric parameters, such as Q, P, L, F, result in the same conclusion about their parent materials.