Abstract
Based on the mineralogy and major and trace element
 composition (including REE+Y) of bulk samples
 and in separate size fractions of the ore, the contribution
 of different REE+Y species to the total REE budget of
 ironstones from the Kamysh-Burun trough was estimated.
 Kerch ores have the structure of REE+Y accumulation
 typical for marine sedimentary iron ore deposits.
 Light REEs form independent mineralization of authigenic
 phosphates (rhabdophane-type LREE(PO4)∙nH2O
 phases) enriched in La, Pr, Nd, and Ca. Medium REEs
 are mainly adsorbed on Fe3+-(oxy)hydroxides forms. The
 coexisting Nd and MREE enrichment combined with Th
 and U depletion allow considering the Kerch ironstones
 as commercially attractive unconventional resources of
 rare-earth elements.
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