Papers in Meteorology and Geophysics
Online ISSN : 1880-6643
Print ISSN : 0031-126X
ISSN-L : 0031-126X
Chemical Composition and the Rate of Accumulation of Ferromanganese Nodules in the Western North Pacific
Yukio SugimuraYasuo MiyakeHatsue Yanagawa
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1975 Volume 26 Issue 2 Pages 47-54

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Abstract

The major and some of the m inor constituents and the rate of accumulation of manganese nodules in the western North Pacific were determined. Manganese concentration in the nodules ranged from 20 to 30 per cent in the acid soluble fraction. As to the rare earth concentration, enrichment of cerium was observed in the manganese nodule as compared with that in shales or sea water. Thorium to uranium ratio in the nodule ranged from 9.4 to 14.3, which was very much higher than that in sea water. From the distribution of excess ionium, excess protactinium and Io/Th ratio, a rate of accumulation of 7mm per million years was obtained with the surface layer of several mm in thickness of the JEDS-4-E4 nodule.

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© by Japan Meteorological Agency / Meteorological Research Institute
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