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Geochemistry of the suspended sediment in the estuaries of the Mandovi and Zuari rivers, central west coast of India

DRS at CSIR-National Institute of Oceanography

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Title Geochemistry of the suspended sediment in the estuaries of the Mandovi and Zuari rivers, central west coast of India
 
Creator Kessarkar, P.M.
Shynu, R.
Rao, V.P.
Chong, F.
Narvekar, T.
Zhang, J.
 
Subject resuspended sediments
suspended particulate matter
clay minerals
organic matter
 
Description The geochemistry of the suspended particulate matter (SPM) collected during the monsoon was determined to identify the sources of SPM and to understand the physicochemical processes in the Mandovi and Zuari river estuaries. The concentrations of SPM decrease seaward in both estuaries, but are relatively high at bay stations. Kaolinite is the most dominant clay mineral in the upstream of both rivers. Smectite increases seaward in both estuaries and is abundant in the bay. Upstream stations of Mandovi, where ore deposits are stored on the shore, exhibit high Fe, Mn, total rare earth elements (total REE), and middle REE- and heavy REE-enriched patterns. Channel stations of both estuaries exhibit middle REE- and light REE-enriched patterns, which gradually changed seaward to middle REE- and heavy REE-enriched patterns. Canal stations exhibit the highest concentrations of major and trace metals. High metal/Al ratios occur at stations in the upstream of Zuari and at the confluence of canals in the Mandovi estuary. Enrichment factors of metals indicate that Mn is significantly polluted while other metals are moderately polluted. The delta 13C and delta 15N of organic matter indicate that the terrigenous organic matter at the upstream is diluted seaward by marine organic matter. Organic matter at bay stations is largely marine and altered-type. The compositions of SPM are controlled by the particulates from ore dust, the geology of the drainage basins, and the physicochemical processes in the estuaries. Particulates resuspended from the bay are dominated by ore dust, which are advected into the channels of both estuaries during the lull periods of the monsoon.
 
Date 2013-04-25T12:09:30Z
2013-04-25T12:09:30Z
2013
 
Type Journal Article
 
Identifier Environmental Monitoring and Assessment, vol.185; 2013; 4461-4480
http://drs.nio.org/drs/handle/2264/4288
 
Language en
 
Rights An edited version of this paper was published by Springer. This paper is for R & D purpose and Copyright [2013] Springer.
 
Publisher Springer