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Chemistry and possible resource potential of cobalt rich ferromanganese crust from Afanasiy-Nikitin seamount in the Indian Ocean

DRS at CSIR-National Institute of Oceanography

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Title Chemistry and possible resource potential of cobalt rich ferromanganese crust from Afanasiy-Nikitin seamount in the Indian Ocean
 
Creator Parthiban, G.
Banakar, V.K.
 
Subject ferromanganese nodules
sediment chemistry
mineralogy
aluminium
iron
nickel
cobalt
seamounts
provenance
carbonate compensation depth
oxygen minimum layer
 
Description Samples of ferromanganese encrustations (fe-Mn crusts) dredged from the upper flank of the Afanasiy-Nikitin seamount, above the Carbonate Compensation Depth (CCD) in the Northern Central Indian Ocean (NCIO) were analysed for Al, Fe, Mn, Ca, Ba, Cu, Ni, Co, Zn and V and found to be rich in Co (upto 0.88%) mineralogically, the studied Fe-Mn crust samples contain poorly crystalline d-MnO sub(2) and minor amount of Carbonate Fluorapatite (CFA) and feldspars. The low Mn/Fe ratios (less than 2), d-MnO sub(2) dominant mineralogy and the interlement associations show that these crusts are formed by slow hydrogenetic precipitation of colloidal Fe-Mn oxyhydroxides. Fe, Mn, Co, Zn and V exhibit matually strong positive association (r greater than 0.7) indicating their incorporation into the Fe-Mn crust during the hydrogenetic precipitation. The Al on the other hand, appears to be independent and diluant for hydrogenetic component. Therefore, the Al in the Fe-Mn crusts might be due to the presence of fine lithogeneous detritus intermixed with hydrogenetic component. Another detrital indicator element 'Ti', instead of showing the affinity to Al exhibits affinity towards hydrogenetic oxide elements suggesting a possible incorporation into Fe-Mn crust analogous to other transition metals.
 
Date 2009-01-10T11:09:56Z
2009-01-10T11:09:56Z
1999
 
Type Journal Article
 
Identifier The Indian Mineralogist, Vol.33; 125-132p.
http://drs.nio.org/drs/handle/2264/1766
 
Language en
 
Rights Copyright [1999]. 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 Geological Survey of India