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Abstract <p>Contents of rare earth elements (REEs) in sediments of the Atlantic Ocean are significantly lower than in the Pacific. The factors that determine this difference remain still unclear, thus we applied the sequential leaching, which for the first time showed the distribution of REEs and yttrium (Y) in mineral phases of Atlantic pelagic sediments. It was established that the biogenic apatite is a main REE host, containing up to 62% of the total ΣREY. Fe–Mn oxyhydroxides and an aluminosilicate (lithogenic) phases account for ~24 and 14%, respectively. It is shown that the variations in the REE content and the composition with sediment core depth are caused by a ratio of biogenic apatite and oxyhydroxide component. Our data indicate that the lower REE concentrations in the Atlantic sediments are related to the low contents of bioapatite, which decrease with increasing sedimentation rate and decreasing water bioproductivity.</p>

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Distribution of Rare Earth Elements between Minerals in Sediments of the Brazil Basin, Atlantic Ocean

  • 期刊论文

  • 发表日期：

    2026年6月24日

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  • E. D. Berezhnaya,
  • D. A. Shadrina,
  • A. V. Dubinin,
  • M. N. Rimskaya-Korsakova

摘要

Abstract

Contents of rare earth elements (REEs) in sediments of the Atlantic Ocean are significantly lower than in the Pacific. The factors that determine this difference remain still unclear, thus we applied the sequential leaching, which for the first time showed the distribution of REEs and yttrium (Y) in mineral phases of Atlantic pelagic sediments. It was established that the biogenic apatite is a main REE host, containing up to 62% of the total ΣREY. Fe–Mn oxyhydroxides and an aluminosilicate (lithogenic) phases account for ~24 and 14%, respectively. It is shown that the variations in the REE content and the composition with sediment core depth are caused by a ratio of biogenic apatite and oxyhydroxide component. Our data indicate that the lower REE concentrations in the Atlantic sediments are related to the low contents of bioapatite, which decrease with increasing sedimentation rate and decreasing water bioproductivity.