Abstract

The distribution of rare-earth elements (REEs) in ferromanganese deposits (FMDs) from the southeastern Laptev Sea is considered. The ore part of FMDs consisting mainly of iron hydroxides (limonite) results from the process of suboxic diagenesis enhanced by bioturbation. It is responsible in FMDs for the deficiency in Ce and some enrichment in middle REEs (MREEs). The (alumino)silicate part of FMDs is genetically related with bottom sediments, corresponds to their REE composition, and most likely controls the scandium content. Because of the high formation rate of hydroxides, the total REE content in FMDs is lower than that in bottom sediments.

中文翻译：

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拉普捷夫海铁锰矿床中稀土元素分布的初步数据

摘要

考虑了东南拉普捷夫海的锰铁矿床（FMDs）中的稀土元素（REEs）分布。FMD的矿石部分主要由氢氧化铁（褐铁矿）组成，其原因是生物扰动增强了亚氧成岩作用。它在口蹄疫中负责铈的缺乏和中等稀土元素（MREE）的富集。FMD的（铝）硅酸盐部分与底部沉积物在遗传上相关，对应于它们的REE组成，最有可能控制controls的含量。由于氢氧化物的高形成速率，FMD中的总REE含量低于底部沉积物中的REE含量。