Abstract

The behavior of platinum group elements (PGE = Pt, Pd, Ru, Ir) in separate layers of ferromanganese crusts of the Atlantic Ocean is considered. The studied crusts, in addition to the hydrogenous source of the matter (crusts from the Bathymetrists Seamounts), formed under the variable influence of hydrothermal (MAR, station 2176) and halmyrolytic sources of matter (Angola Basin, station 2179). It was found that during the evolution of the crusts, the content of hydrogenous elements (Co, Ce) increases and the mass fraction of PGE (Pt, Ir, Pd) decreases. The most probable reason for this enrichment is the release of platinum into seawater as a result of halmyrolysis of the underlying volcanic rocks at an early stage of crust formation. The study of the forms of PGE (adsorbed and native) using hydrochloric acid leachates showed the absence of notable amounts of native platinum in the lower layers of crusts enriched in it. Consequently, PGE are present in the ore phase of crusts in oxidized form independently of the source of material input and cannot passively accumulate in the form of intermetallic compounds during weathering of substrate volcanic rocks.

中文翻译：

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大西洋锰铁地壳中的铂族元素：物质的形式和来源

摘要

考虑了大西洋铁锰结壳不同层中铂族元素（PGE = Pt、Pd、Ru、Ir）的行为。除了物质的氢源（来自测深海山的地壳）之外，所研究的地壳是在热液（MAR，站点 2176）和物质的盐解源（安哥拉盆地，站点 2179）的可变影响下形成的。研究发现，在结壳演化过程中，含氢元素（Co、Ce）的含量增加，PGE（Pt、Ir、Pd）的质量分数降低。这种富集的最可能原因是由于在地壳形成的早期下伏火山岩的半干解作用，铂释放到海水中。使用盐酸浸出液对 PGE（吸附的和天然的）形式的研究表明，在富含铂的结壳的下层中没有显着数量的天然铂。因此，PGE 以氧化形式存在于结壳的矿相中，与物质输入源无关，并且在基底火山岩风化过程中不能以金属间化合物的形式被动积累。