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Distribution of major, trace and rare-earth elements in surface sediments of the Wharton Basin, Indian Ocean

DRS at CSIR-National Institute of Oceanography

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Title Distribution of major, trace and rare-earth elements in surface sediments of the Wharton Basin, Indian Ocean
 
Creator Pattan, J.N.
Rao, Ch.M.
Higgs, N.C.
Colley, S.
Parthiban, G.
 
Description Bulk chemical analysed of eighteen surface sediments taken on an east-west transect (lat. 15 degrees 40'S) in the Wharton Basin, Indian Ocean, were analysed for major, trace and rare-earth elements (REE) by inductively coupled plasma-atomic emission spectrometry (ICP-AES). The relationship between Al and K suggests in situ formation of authigenic phillipsite. The relationship between P and Ca suggests accumulation of biogenic apatite/fish bone debris from high biological productivity waters, which is confirmed by the linear relationship with P and Cu. A strong positive correlation among redox sensitive metals (Mn, Fe, Cu, Ni, and Zn) suggests that they are incorporated into a ferromanganese oxide phase, probably micronodules. Calcareous oozes from the transect have low REE abundance (La approximately 8 ppm) with a very strong negative Ce/Ce value (0.41), siliceous oozes have high REE abundance (La approximately 28 ppm) with moderate positive Ce/Ce (1.24) and red clays have highest REE abundance (La approximately 66 ppm) with a weak positive (1.05) to moderate negative Ce/Ce (0.73). Shale-normalized REE patterns and (La/Yb) sub(n) ratios record similar enrichment of heavy REE (HREE) relative to light REE (LREE) in all sediment types. This might be due to retention of the bottom water REE pattern and the presence of fish bone debris. Correlation coefficient and R-mode factor analyses suggest a very strong positive association (R super(2) greater than 0.9) REE with P, and thus most likely with biogenic apatite/fish bone debris. As P is directly associated with biological activity it is thus related to surface primary productivity. REE in the Wharton Basin sediments appear to reflect a combination of surface water effects and diagenetic processes
 
Date 2009-01-25T06:05:30Z
2009-01-25T06:05:30Z
1995
 
Type Journal Article
 
Identifier Chemical Geology, Vol.121; 201-215p.
http://drs.nio.org/drs/handle/2264/2347
 
Language en
 
Rights Copyright [1995]. 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