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The Geochemistry Characters of Ferromanganese Nodules in the Middle and Lower Reaches of Yangtze River

YANG Li-hui1,YE Wei2(1.College of Territorial Resources and Tourism,Anhui Normal University,Wuhu 241000,China;2.College of Tourism and Resources Management,Zhejiang Normal University,Jinhua 321004,China)  
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.
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