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

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    Mar_Min_6_419.pdf (477.4Kb)
    Date
    1987
    Author
    Jauhari, P.
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    Abstract
    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
    URI
    http://drs.nio.org/drs/handle/2264/6944
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