Modes of occurrence of rare earth elements in peat from Western Siberia

• Published in: Journal of geochemical exploration 2018-01, Vol.184, p.40-48
• Main Authors: Arbuzov, S.I., Maslov, S.G., Finkelman, R.B., Mezhibor, A.M., Ilenok, S.S., Blokhin, M.G., Peregudina, E.V.
• Format: Article
• Language: English
• Subjects: Conditions of peat formation; Modes of occurrence; Peat; Rare earth elements
• ISSN: 0375-6742; 1879-1689
• DOI: 10.1016/j.gexplo.2017.10.012

Selective leaching of rare earth elements (REE) from peat samples from Western Siberia indicates unanticipated modes of r occurrence. It has been determined that from 40 to 80% of the total REE in the peat is accounted for in the hydrolyzable and water-soluble substances, 10–30% of the REE is concentrated in humic acids. Minerals in peat play a minor role in the accumulation of REE. In general, no >25% of REE is accounted for in mineral association. Among the mineral forms of REE in peat, clastogenic phosphates (monazite, xenotime, crandallite group) and zircon are the dominant hosts. REE are distributed in different phases of the peat: the water-soluble and hydrolyzable substances are relatively enriched in light REE, and humic substances are enriched in heavy REE. •The paper observes the modes of occurrence of REE in peat.•The organic modes of occurrence of REE prevail in the peat.•LREE and HREE are separated in the peat organic matter. Minerals do not play a significant role in the accumulation of REE in peat.