黄土地层化学成分迁移深度与含量研究

Migration depth and content of chemical composition in loess strata

研究了黄土地层化学成分的迁移深度与含量．根据黄土高原第四纪土壤的广泛调查，发现了 Ｃａ Ｃ Ｏ３ 等化学成分的多种特殊淀积现象，结合化学成分含量分析，确立了研究古环境的迁移深度指标；并将黄土地层 Ｃａ Ｃ Ｏ３ 分为碎屑 Ｃａ Ｃ Ｏ３，淀积 Ｃａ Ｃ Ｏ３，同期淋溶残余 Ｃａ Ｃ Ｏ３，后期淋溶残余 Ｃａ Ｃ Ｏ３ 和表聚 Ｃａ Ｃ Ｏ３ ５ 种，提出了用 Ｃａ Ｃ Ｏ３

On the basis of extensive investigation on Quaternary paleosols in Loess Plateau, many special illuvial layers of CaCO 3 have been found. In the light of the material from field survey and chemical analysis, the index in migration depth of chemical composition used to reconstruct paleoenvironment is deter mined. CaCO 3 in loess strata can be divided into five types, namely, fragment CaCO 3, illuvial CaCO 3, contemporaneous remnant CaCO 3, deuterogenic residual CaCO 3 and evaporated CaCO 3, and new CaCO 3 content standard indicating paleoenvironment is raised.