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

DRS at CSIR-National Institute of Oceanography

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Title Mineralogical and geochemical characters of surface sediments from the central Indian Basin
 
Creator Banerjee, R.
 
Subject sediments
ferromanganese nodule
central Indian basin
volcanic
pelagic clay sediments
 
Description 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.
 
Date 2008-02-22T05:31:30Z
2008-02-22T05:31:30Z
1998
 
Type Journal Article
 
Identifier Current Science, Vol.75(12); 1364-1371p.
http://drs.nio.org/drs/handle/2264/980
 
Language en
 
Rights Copyright [1998]. It is tried to respect the rights of the copyright holders to the best of the knowledge. If it is brought to our notice by copyright holder that the rights are voilated then the item would be withdrawn.
 
Publisher Current Science Association