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Distribution of iron, manganese, cobalt and nickel in sediment cores of the northeastern Arabian Sea

DRS at CSIR-National Institute of Oceanography

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Title Distribution of iron, manganese, cobalt and nickel in sediment cores of the northeastern Arabian Sea
 
Creator Rao, Ch.M.
Setty, M.G.A.P.
 
Subject Geology and Geophysics
sediments
cores
mineralogy
distribution
iron
manganese
cobalt
nickel
organic matter
correlation analysis
ISW, Indian Ocean
 
Description A study of the distribution of iron, manganese, cobalt and nickel in sediment cores from the shelf, slope and basin regions of Bombay-Kathiawar coast of India shows that cobalt and nickel are derived from the overlying sea water as adsorbants of manganese and iron hydroxides, clay minerals, and organic matter present in the sediment. Since the cores represent differing environments, the inter-relationship and the factors governing adsorption and fixing them in the sediment vary considerably. Mn/Fe ratio decreases uniformly with depth in the shelf sediments excepting in one core, whereas on the slope and the basin, it indicates a gain which is due to the enclosed slum and turbidite deposits. The manganese: iron ratios for (a) the shelf cores are 1:72; 3:205; and 6:265; (b) for the slope it is 1:116; and (c) the basin 6:170. The values are highest in one core. This suggests an enrichment of manganese in the shelf region and in the basin, but great mobility in the slope and parts of the shelf resulting in depletion. Iron-cobalt and manganese-nickel are the covariants, and hence correlatable. Significantly, the organic matter in the slope sediment is inversely proportional to the amount of manganese present in the sediment. One core shows some unusually high values (56 ppm cobalt and 75 ppm nickel) as against the average values of 13 and 55 respectively, for near-shore sediments (total sediment) of North Atlantic and North Pacific
 
Date 1997-11-26T09:56:51Z
2017-09-29T13:47:04Z
1997-11-26T09:56:51Z
2017-09-29T13:47:04Z
1976
 
Type Journal Article
 
Identifier Journal of the Geological Society of India, vol.17(2); 1976; 252-261
0016-7622
http://drs.nio.org/drs/handle/2264/5496
 
Language en
 
Relation J Geol Soc India
SCI
 
Publisher Geological Society of India