Abstract—

The paper presents data on contents of the platinum group elements (Pt, Ir, Pd, and Ru) and Au in Fe–Mn nodules of different morphology and in their separate layers from the Cape Basin, Atlantic Ocean. The Layer-by-layer analysis of the Fe–Mn nodules and crusts shows that the platinum group elements (PGE) are accumulated in the ferromanganese oxyhydroxide layers relative to the clayey nuclei and the substrate of the crust. Among oxyhydroxide layers, PGE are more significantly concentrated in the hydrogenetic (sedimentation) layers of the nodules than in layers with predominant oxic and suboxic diagenetic material. Gold is demonstrated not to be accumulated in the Fe–Mn nodules. The reason for the predominant accumulation of platinum relative to palladium in nodules is the oxidative sorption on manganese oxyhydroxides suspended in seawater. An increase in the growth rate of the nodules due to the input of diagenetic material from sediments is accompanied by an increase in the Mn/Fe value in the nodules. The increase of Mn/Fe value in nodules is shown to be associated with a decrease in the Pt/Pd ratio, which indicates a dominant role of the hydrogenetic input of PGE to the nodule. The contents of iridium and ruthenium correlate with the contents of platinum and cerium.

中文翻译：

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大西洋开普盆地的锰铁结核中铂族元素的分层分布

摘要-

本文介绍了来自大西洋海角盆地的不同形态的Fe-Mn结核中以及它们不同层中的铂族元素（Pt，Ir，Pd和Ru）和Au的含量数据。Fe-Mn结节和结壳的逐层分析表明，铂族元素（PGE）相对于粘土核和结壳基质堆积在氢氧化锰铁氧化物层中。在羟基氧化物层中，PGE集中在结节的氢化（沉淀）层中，而不是在主要含氧和亚氧成岩物质的层中。已证明金不会在Fe-Mn结核中积累。结核中铂相对于钯占优势的原因是悬浮在海水中的羟基氧化锰上的氧化吸附。由于来自沉积物的成岩物质的输入，结核的生长速率增加，同时结核中的Mn / Fe值也随之增加。结核中Mn / Fe值的增加与Pt / Pd比值的降低有关，这表明PGE氢输入结核中起主导作用。铱和钌的含量与铂和铈的含量相关。