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    Mineralogical and geochemical characters of surface sediments from the central Indian Basin

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    Curr_Sci_75_1364.pdf (947.4Kb)
    Date
    1998
    Author
    Banerjee, R.
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    Abstract
    Mineralogy and geochemistry of three types of surface sediments including their intermixtures, from 31 stations, in the ferromanganese nodule belt of the central Indian basin have been studied. Abundant illite, kaolinite and chlorite in terrigenous and siliceous sediments of the northern part of the basin indicate the influence of continental influx. This influence, however, decreases in the southern part of the basin where smectite is predominant, indicating volcanic input. The basinal sediments are enriched in trace metal (e.g. Mn, Fe, Ni, Cu, Co) inhomogeneously. Ni, Cu and Co are well correlated with Mn in terrigenous, siliceous and pelagic clay sediments. However, metal enrichment processes differ. The enrichment process is diagenetic in siliceous and, hydrogenetic in pelagic clay and terrigenous sediment-dominanted domains. In terrigenous-siliceous mixes sediments, metal enrichment is a combination of hydrogenetic and early diagenetic processes. Similarity in Cu/Mn and Ni/Mn ratios between ferromanganese nodules and siliceous sediments and pelagic clay sediments, respectively, indicate that while bulk of Ni resides in the hydrogenous fraction of pelagic clay, Cu is enriched by the cummulative effect of hydrogenetic and early diagenetic processes in siliceous sediments.
    URI
    http://drs.nio.org/drs/handle/2264/980
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