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REE in suspended particulate matter and sediment of the Zuari estuary and adjacent shelf, western India: Influence of mining and estuarine turbidity

DRS at CSIR-National Institute of Oceanography

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Title REE in suspended particulate matter and sediment of the Zuari estuary and adjacent shelf, western India: Influence of mining and estuarine turbidity
 
Creator Shynu, R.
Rao, V.P.
Parthiban, G.
Balakrishnan, S.
Narvekar, T.
Kessarkar, P.M.
 
Subject rare earths
suspended inorganic matter
sediment movement
brackishwater pollution
 
Description Concentrations of Al, Fe, Mn and rare earth elements (REE) were measured in 122 samples of suspended particulate matter (SPM) and 70 surficial sediments from the Zuari estuary and the adjacent shelf to understand their distribution, provenance and estuarine processes. Concentrations of SPM were low in the upper estuary, increased seaward with high values in the lower estuary and then decreased at stations in the bay in all seasons. The distributions of mean Sigma REE, Al and Fe along transect imitate each other and resemble inverted bowl-shaped pattern, with high and identical values at the lower estuary. The mean Sigma REE, Al and Fe of sediment along transect showed two peak high values, one in the upper estuary and another in the bay amid low values corresponding to the lower estuary. The variations in the mean ratio of Sigma REESPM/Sigma REESED along transect resembled that of mean SPM at each station. The Sigma REE of sediments in shallow shelf were close to that of the bay and, decreased seaward with increasing depth. PAAS-normalized REE patterns of every SPM/sediment sample revealed MREE- and HREE-enrichment with positive Ce and Eu anomalies. Ce*/Ce was inversely correlated with Eu*/Eu and salinity and, directly correlated with Mn concentrations. The results indicate that the REE of SPM/sediment is dominated by Fe, Mn ore dust and, its distribution along transect is controlled by the estuarine turbidity maximum (ETM). The ETM and seasonal circulation in the estuary controlled mixing and advective transport of particulates to the shelf during monsoon and, into the estuary during dry season. This study indicates sediment contribution to the shelf from tropical, minor rivers that are controlled by hydrodynamic conditions in the estuaries and should not be underestimated
 
Date 2013-12-10T05:55:12Z
2013-12-10T05:55:12Z
2013
 
Type Journal Article
 
Identifier Marine Geology, vol.346; 2013; 326-342
http://drs.nio.org/drs/handle/2264/4398
 
Language en
 
Rights An edited version of this paper was published by Elsevier. Copyright [2013] Elsevier
 
Publisher Elsevier