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Environmental magnetism and application in the continental shelf sediments of India

DRS at CSIR-National Institute of Oceanography

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Title Environmental magnetism and application in the continental shelf sediments of India
 
Creator Alagarsamy, R.
 
Subject geochemistry
continental shelves
heavy metals
magnetism
 
Description Mineral magnetic and geochemical analyses were carried out on surface sediments from the continental shelf of India. The purpose of this study is to examine the environmental assessment of heavy metal concentrations and its impact in the coastal environment using magnetic techniques and to gain an understanding on the factors controlling metal concentrations and distributions in the east and west coast of India. The strong relationships between Anhysteretic Remanent Magnetization (Chi ARM) and heavy metals can be explained by the role of iron oxides controlling metal concentrations, though the link is also reinforced by the strong tendency of Chi ARM to be associated with the finer particle sizes. Higher values of magnetic susceptibility, IRM20 mT and SIRM are associated with the east coast shelf sediments suggest the presence of high ferrimagnetic content, which can be derived from the weathering products of the Deccan Basalts. Chi ARM can be used as a normalizer for particle size effects in the way that Aluminium (Al) is often used. The relationship between magnetic parameters and heavy metal concentrations (Fe, Cu, Cr and Ni) showed a strong positive correlation in the east coast sediments, much less so in the case of the west coast. This finding suggests that the simple, rapid and non-destructive magnetic measurement can be used as an indicator for the heavy metal contamination and proxies for the mesurement of heavy metals content in the coastal environment
 
Date 2009-06-26T04:15:18Z
2009-06-26T04:15:18Z
2009
 
Type Journal Article
 
Identifier Marine Environmental Research, vol.68(2); 49-58
http://drs.nio.org/drs/handle/2264/3368
 
Language en
 
Rights An edited version of this paper was published by Elsevier. Copyright [2009] Elsevier
All efforts have been made to respect the copyright to the best of our
knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher Elsevier