Other
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48..911f&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 48, Issue 5, pp.911-919
Other
7
Scientific paper
Estimates of the growth rates of ferromanganese nodules at MANOP Site H (6°33'N, 92°49'W) lie between 7 and 1200 mm/my. The most probable range (estimated from nodule size distributions, nodule chemistry, accumulation rates of authigenic elements and U-series modeling) is 30-300 mm/my. Such rates are much faster than measured values for most pelagic nodules. The distributions of U-series and stable elements suggest that a typical nodule consists of two compositionally distinct non-detrital components, one rich in Mn, U and Sb, and the other in Fe, Co, REE, Ni, Cu and Th. When the uncorrected U-series data, which do not show simple decay patterns with depth, are normalized to the relative proportion of the Fe-rich component, the data yield well-constrained growth rates of 55 mm/my for a nodule top and 200 mm/my for its bottom. The component enriched in Mn, which is most abundant on nodule bottoms, appears to accrete much faster than the component enriched in Fe.
Finney Bruce
Heath Ross G.
Lyle Mitchell
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