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chang jiang san jiao zhou wan di si ji gu tu rang yu gu huan jing chu tan
Author(s): 
Pages: 79-87
Year: Issue:  S1
Journal: Acta Sedimentologica Sinica

Keyword:  古土壤长江三角洲晚第四纪古环境;
Abstract: 长江三角洲地区第一硬粘土层中有植物根、植屑、裂隙、粘粘胶膜、土壤结构体、结核等古土壤特征,系古土壤。粒度、化学分析及磁组构分析揭示它为多期成土作用形成的复合古土壤层。根据硬粘土层与南京下蜀土、黄土高原黄土一古土壤系列及上海亚近代潮坪沉积的磁性参数对比,推断该古土壤的母质系河流冲积物。硬粘土层中裂隙的广泛发育及充填,软锰矿的分布表明当时地下水位波动较大,干湿季节分明,古季风的影响较强。
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