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Geochemistry of ferromanganese micronodules and associated Mn and trace metals diagenesis at high terrigenous depositional site of middle fan region, Bay of Bengal

DRS at CSIR-National Institute of Oceanography

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Title Geochemistry of ferromanganese micronodules and associated Mn and trace metals diagenesis at high terrigenous depositional site of middle fan region, Bay of Bengal
 
Creator Chauhan, O.S.
 
Subject geochemistry
ferromanganese nodules
magnesium
trace metals
diagenesis
terrigenous sediments
nickle
copper
zinc
 
Description The influence of sedimentation on the morphology, growth and geochemistry of the micronodules, and on Mn enrichment in the sediments of the Bay of Bengal has been evaluated. Mn accumulation is 307-219 mg cm u2 kyr u-1 in cores having 20-17 cm kyr u-1 sedimentation rate, but drops to 34-17.7 mg cm u2 kyr u-1 in cores with 3-4 cm kyr u-1 sedimentation rates. However, Mn-enrichment zone becomes thinner with increased sedimentation. The abundance of the micronodules increases, and they have been observed down to the deeper levels with higher contents of Mn Ni, Cu and Zn from the areas of the lower sedimentation. The results of the present study reveal that though the higher sedimentation may be conducive for higher Mn accumulation in the upper surfaces of the sediments, the growth, abundance and enrichment of Mn, Ni, Cu and Zn in the micronodules are mostly regulated by their residence time within Mn oxidation zone. The influence of residence time on the morphology and the internal structures of the micronodules are also evaluated
 
Date 2008-07-18T05:45:18Z
2008-07-18T05:45:18Z
2003
 
Type Journal Article
 
Identifier Deep-Sea Research II, Vol.50; 961-978p.
http://drs.nio.org/drs/handle/2264/1256
 
Language en
 
Rights Copyright [2003]. It is tried to respect the rights of the copyright holders to the best of the knowledge. If it is brought to our notice that the rights are violated then the item would be withdrawn.
 
Publisher Elsevier