Study of phosphorus distribution in grain size fractions of eupelagic clays showed high (up to 3%) content of P in Fe-Mn micronodules that can contain up to 20-30% of total P. Mineral P associated with Fe in ocean sediments is an analog of manganese in ocean sedimentogenesis. Sharp decrease of P contents in ocean Fe-Mn nodules compared to ones from seas results from decrease of Fe contents and partial neutralization of Fe activity by Mn.
Supplement to: Sevastyanova, Elena S (1981): On phosphorus behavior in Fe-Mn micro- and macronodules of the ocean. Litologiya i Poleznyye Iskopaemyye (Lithology and Mineral Resources), 16(6), 96-101