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Cerium anomaly variations in ferromanganese nodules and crusts from the Indian Ocean

DRS at CSIR-National Institute of Oceanography

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Title Cerium anomaly variations in ferromanganese nodules and crusts from the Indian Ocean
 
Creator Nath, B.N.
Roelandts, I.
Sudhakar, M.
Pluger, W.L.
Balaram, V.
 
Subject Geology and Geophysics
Geology and Geophysics
cerium
ferromanganese nodules
manganese deposits
rare earths
anomalies
petrology
chemical composition
ISW, Indian Ocean
 
Description Fifty analyses of rare earth elements as well as mineralogical studies have been carried out on a suite of manganese nodules and crusts from the Central Indian Basin and the Western Indian Ocean. The aim was to identify the processes controlling the REE patterns of the phases hosting the REE in the manganese nodules, with an emphasis on an understanding of the Ce anomaly. This has involved separating the encrusting layers and nuclei physically as well as Fe-Mn oxides from the aluminosilicate phase chemically (using a 2 M HCI leach) prior to analysis. The presence of nodule nuclei seems to have little influence (mostly < 5% to a maximum of 30%) on the overall magnitude of the Ce anomalies in these nodules. The ratios of concentrations of elements in the acid leachates and the corresponding bulk values yield flat REE patterns indicating that the aluminosilicate phase contributes very little to the Ce anomalies. Interelement relations indicate that the Ce anomalies are largely controlled by the amorphous mineral phase FeOOH.xH@d2@@O. The relationship of Fe, Ce anomaly and delta-MnO@d2@@ further suggests that Ce is chemisorbed onto iron oxyhydroxides which are epitaxially intergrown with ~d-MnO@d2@@. The regional distribution of the Ce anomaly values appears to depend on many of the factors responsible for the uptake of other minor metals in nodules and crusts
 
Date 1995-07-05T10:06:30Z
2017-09-30T02:52:22Z
1995-07-05T10:06:30Z
2017-09-30T02:52:22Z
1994
 
Type Journal Article
 
Identifier Marine Geology, vol.120(3-4); 1994; 385-400
0025-3227
http://drs.nio.org/drs/handle/2264/7481
 
Language en
 
Relation Mar Geol
SCI
 
Publisher Elsevier