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The deep-sea metalliferous sediments and Fe-Mn polymetallic nodules formed in modern environment at the deep-sea ocean floor (> 4000 m depth) were evaluated as promising new raw materials, especially for critical elements as Li, Co, Cu, Mn, Ni, and rare earth elements (REE). We use - selective sequential leaching procedure to study the distribution of main and trace elements in sequential leached phases from deep-sea polymetallic nodules and sediments from the eastern part of the Clarion-Clipperton fractures zone,...