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Geochemistry of deep-sea sediment cores from the Central Indian Ocean Basin

DRS at CSIR-National Institute of Oceanography

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Title Geochemistry of deep-sea sediment cores from the Central Indian Ocean Basin
 
Creator Mudholkar, A.V.
Pattan, J.N.
Parthiban, G.
 
Subject deep water
sediments
cores
geochemistry
transition elements
manganese
copper
nickel
zinc
 
Description Four sediment cores from the Central Indian Ocean Basin (CIOB) were studied to characterise the coarse fraction (less than 63 mu), transition metal and major oxide contents. Transition metals (Mn, Cu, Ni, Zn) show enrichment towards the surface, thought to be of diagenetic origin. Metals are suppliEd. by upward migration from a suboxic to anoxic zone at an intermediate depth of 12-35 cm below the sediment-water interface in all the cores. Buried maxima in transition metal concentration at depth of 26-55 cm below the sediment-water interface may represent relict enrichments formed prior to the formation of suboxic to anoxic zone. R-mode factor analysis suggests that detrital and diagenetic/hydrogenous components are the two main sources of elements in these sediments. The terrigenous index factor [Al/(Al+Fe+Mn)] showed its maximum influence as far south as 14 degrees S from approximately 140 to 100 ky BP (last interglacial maxima). This might be related to discharge of large quantity of sediments by Ganges and Brahmaputra rivers during intensive monsoon in the Asian sub-continent during that period
 
Date 2009-05-06T10:40:26Z
2009-05-06T10:40:26Z
1993
 
Type Journal Article
 
Identifier Indian Journal of Marine Sciences, Vol.22(4); 241-246p.
http://drs.nio.org/drs/handle/2264/2822
 
Language en
 
Rights Copyright [1993]. 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 NISCAIR, New Delhi