Uranium content of in phosphorites from Pacific seamounts does not exceed 10ppm; it is significantly lower than in phosphorites from submarine continental margins and deposits on land. Phosphate is not the main carrier of uranium, which is inhomogeneously distributed in ferromanganese hydroxide-, phosphate-, silicate- and carbonate materials. Uranium associated with phosphate is not isomorphic admixture. Uranium occurs in rocks in fine particles of unknown composition. Ultramicroscopic inclusions of U(IV) oxides have been also found.

Supplement to: Baturin, Gleb N; Kochenov, A V; Dubinchuk, V T (1982): Uranium in phosphorites from Pacific seamounts. Litologiya i Poleznyye Iskopaemyye (Lithology and Mineral Resources), 17(1), 3-10