中文摘要：

经分析,长江中下游地区第四纪红土中铁锰结核中以Si、Fe、Al、Mn等元素为主,其中,Fe、Mn、Pb和Cd大量富集,稀土元素为强烈富集,其中Ce表现出强烈的正异常.根据结核的元素富集特征及铁锰的地球化学特征推测,长江中下游地区第四纪红土中结核形成过程经历了较强烈的干湿环境变化过程.

英文摘要：

The ferromanganese nodule samples in red earth were collected from Xuancheng in Anhui province,Jinhua in Zhejiang province,Changsha in Hunan province and Jiujiang in Jiangxi province.All the samples were dried by drier at 60℃ for 24 hours,and analyzed using XRD and ICP-MS techniques.The main oxides in Quaternary Red Earth ferromanganese nodules is SiO2、Fe2O3、Al2O3、MnO2 et.Contrast the nodules with its matrix,the Fe,Mn,Pb,Cd were enriched,the REE were enriched strongly.The value of Ce in Quaternary Red Earth ferromanganese nodules is positive unconventionality.This indicated that the nodules have suffered strong redox.Considered from the Fe,Mn geochemistry characteristic and the REE enrichment characteristics,the environment of the period that the nodules were developed was fluctuated between dry and wet.