Abstract
The lithology and geochemistry of the Miocene concretional phosphorites recovered from four submarine rises in the Sea of Japan (the North and South Yamato, the East Korean, and the Krishtofovich) were examined by means of analytical electron microscopy and ICP-MS chemical and microchemical elemental analysis. The microstructural studies and the data on the distributions of the 57 major and trace elements in these phosphorites revealed their close similarities to the Late Quaternary nodular phosphorites from the Namibian shelf, as well as phosphorites from other parts of the world, thus suggesting a common genetic affinity. Unlike the Namibian phosphorites, our samples collected from the Sea of Japan display a number of geochemical signatures indicative of volcanic and hydrothermal activity. This is supported by the presence of positive Ce and Eu anomalies in some samples and the Ga enrichment in a sample from the Chentsov Volcano.
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Original Russian Text © G.N. Baturin, 2012, published in Okeanologiya, 2012, Vol. 52, No. 5, pp. 721–732.
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Baturin, G.N. Phosphorites of the Sea of Japan. Oceanology 52, 666–676 (2012). https://doi.org/10.1134/S0001437012050013
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DOI: https://doi.org/10.1134/S0001437012050013