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Classification and inter-element relationships of ferromanganese nodules from the Central Indian Ocean Basin

DRS at CSIR-National Institute of Oceanography

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Title Classification and inter-element relationships of ferromanganese nodules from the Central Indian Ocean Basin
 
Creator Jauhari, P.
 
Subject Geology and Geophysics
correlation
chemical elements
ferromanganese nodules
classification
ISW, Central Indian Ocean
 
Description The chemical composition of polymetallic nodule samples from 180 locations in the Central Indian Ocean Basin based on 600 chemical analyses has been investigated. These nodules contain a Mn/Fe ratio varying from 0.96 to 8.76 and they broadly fall within the field of "hydrogenous deposits." A finer classification reveals that there are three basically different types of nodules becoming enriched in metals by different depositional processes. Type B nodules having Mn/Fe ratio up to 2.5 show hydrogenous enrichment, type A nodules having a ratio 5 are early diagenetic type, and in between these two is the mixed type AB nodules, having Mn/Fe ratio between 2.5 to 5 and formed by the influence of both processes. Variations of Ni, Cu and Co with Mn/Fe ratio shows a consistent increase in the Ni and Cu values with the increasing Mn/Fe ratio. On the other hand, Co content decreases with the increase in Mn/Fe ratio. A correlation of elements by 'Q' mode cluster analysis shows Cu and Ni strongly associated with each other and with Mn, forming a group A, whereas group B comprises Fe, Co, and an abundance of nodules. Group A and Group B are negatively correlated. The elements' concentration shows a tendency to vary with the sediment type of the area. The highest percentages of Mn/Fe ratio, Mn, Ni, and Cu are associated with the siliceous sediments, whereas concentration of Fe and Co is higher in red pelagic clays
 
Date 1995-06-24T10:01:32Z
2017-09-30T01:27:30Z
1995-06-24T10:01:32Z
2017-09-30T01:27:30Z
1987
 
Type Journal Article
 
Identifier Marine Mining, vol.6; 1987; 419-429
http://drs.nio.org/drs/handle/2264/6944
 
Language en
 
Relation Mar Mining
SCI