RARE EARTH ELEMENT CONTENTS AND COMPOSITIONS IN FERROMANGANESE FORMATIONS OF THE EAST SIBERIAN SEA: A RESPONSE TO RECENT SEDIMENTATION AND DIAGENESIS CONDITIONS

O. N. Kolesnik; Колесник О. Н.; A. N. Kolesnik; Колесник А. Н.; A. S. Astakhov; Астахов А. С.; S. A. Selutin; Селютин С. А.; Xiangwen Ren; Жэнь Сянвэнь; Xuefa Shi; Ши Сюэфа

doi:10.31857/S2686739722601727

RARE EARTH ELEMENT CONTENTS AND COMPOSITIONS IN FERROMANGANESE FORMATIONS OF THE EAST SIBERIAN SEA: A RESPONSE TO RECENT SEDIMENTATION AND DIAGENESIS CONDITIONS

Authors: Kolesnik O.N.¹, Kolesnik A.N.¹, Astakhov A.S.¹, Selutin S.A.¹, Ren X.², Shi X.²
Affiliations:
1. V.I. Il’ichev Pacific Oceanological Institute, Far Eastern Branch of the Russian Academy of Sciences
2. First Institute of Oceanography, Ministry of Natural Resources
Issue: Vol 508, No 1 (2023)
Pages: 79-87
Section: ЛИТОЛОГИЯ
URL: https://journals.rcsi.science/2686-7397/article/view/135715
DOI: https://doi.org/10.31857/S2686739722601727
EDN: https://elibrary.ru/GBHZKK
ID: 135715

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Abstract

The distribution of rare earth elements (REEs) has been studied for the first time in different morphotypes of ferromanganese formations (FMFs) from the East Siberian Sea, namely, ferruginous and ferromanganese crusts, discoid nodules, and biomorphoses. The FMFs were formed at different distances from the land and, accordingly, from the main sources of sedimentary material during (sub)oxic diagenesis. Seaward, with an increase in the oxidation of sediments, primarily because of reducing sedimentation rates, FMFs, against a rising manganese content in them (Mn from 0.09% to 12.34%, Mn/Fe from 0.01 to 1.15), show a decrease in the total REE content (ΣREE from 166.90 ppm to 96.86 ppm), depletion in cerium (Cean from 0.90 to 0.71), and enrichment with middle REEs. Due to the rapid growth of FMFs, which should be faster than sedimentation rates, reactive REE species do not have time to accumulate; therefore, REE total content in FMFs is everywhere lower than in sediments.

Keywords

ferromanganese formations, rare earth elements, East Siberian Sea, terrigenous runoff, diagenesis

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