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Rare earth element distribution and behaviour in buried manganese nodules from the Central Indian Basin

DRS at CSIR-National Institute of Oceanography

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Title Rare earth element distribution and behaviour in buried manganese nodules from the Central Indian Basin
 
Creator Pattan, J.N.
Banakar, V.K.
 
Subject rare earths
distribution
ferromanganese nodules
mineralogy
geochemistry
 
Description Eight burried manganese nodules taken in the upper metre of a siliceous ooze sediment core in the Central Indian Basin at 14 degrees S and 74 degrees E were analysed for major, trace and rare earth (REE) elements. Interelemental correlation yields a strong positive association (r> 0.75) between Fe, P, Ti and REE suggesting a single carrier phase for REE in these nodules namely a titaniumrich ferriphosphate. This correlation significantly improved (r> + 0.90) when the influence of detrital Fe is eliminated and only authigenic Fe is considered. The buried nodules appear to retain the mineralogical and geochemical charactristics (including positive Ce anomaly) acquired during the accretion at the sediment-water interface prior to their burial at approximately 225 kyr B.P. The effect of burial is observed only in the depletion of heavy REE (HREE) in a nodule buried at 23.5 cm depth where the environment is suboxic to anoxic. Middle REE (MREE) in the nodules exhibit enrichment over light REE (LREE) and HREE while LREE exhibit enrichment over HREE compared to the ratios in shale (NASC). This enrichment pattern suggests an uptake sequence of the REE as MREE > LREE > HREE in the manganese nodules
 
Date 2009-05-06T10:47:00Z
2009-05-06T10:47:00Z
1993
 
Type Journal Article
 
Identifier Marine Geology, Vol.112; 303-312p.
http://drs.nio.org/drs/handle/2264/2840
 
Language en
 
Rights Copyright [1993]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher Elsevier