
Keywords: ppm، قطعات در میلیون; ANS, Afanasiy-Nikitin seamount; CFA, carbonate fluorapatite; Fe–Mn, ferromanganese; NER, Ninetyeast Ridge; OMZ, oxygen minimum zone; PCZ, Pacific prime crust zone; PGE, platinum group elements; ppb, parts per billion; ppm, parts per million; REE, rare ear