【摘要】 从北方红黏土中普遍存在的铁锰胶膜入手,分析了铁锰胶膜的环境信息效应,又依据其形成过程提出去除方法,认为铁锰胶膜对红黏土元素地球化学、粒度、磁化率等方面均可能有着不可忽视的影响,而这些均未引起相关学者的重视。通过对甘肃朝那红黏土去除铁锰胶膜后,与原样的微量元素、稀土元素进行对比发现,铁锰胶膜对稀土元素配分模式影响较小,但铁锰胶膜会造成某些稳定元素的迁移,这说明第四纪黄土研究中的某些地球化学指标并不一定适用于红黏土。更多还原

【Abstract】 Fe-Mn coatings are prevalent on the red clay in North China.First,the environmental information effects of Fe-Mn coatings are analyzed.Then removal methods are proposed based on the information.Especially,Fe-Mn coatings may have a significant impact on the element geochemistry,grain size analysis and magnetic susceptibility,which are always neglected by other researchers.After removal of Fe-Mn coatings in Gansu Chaona red clay,it is found that Fe-Mn coatings have less effects upon the distribution patterns of rare earth elements compared with the original samples,but they may cause migration of some stable elements.This shows that some Quaternary geochemical indicators are not suitable for the red clay.更多还原