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Replacement and authigenic mineralogy of metal contaminants in stream and estuarine sediments at Newtownards, Northern Ireland

Published online by Cambridge University Press:  05 July 2018

N. R. Moles ,
S. M. Betz ,
A. J. McCready  and
P. J. Murphy
N. R. Moles*
Affiliation:
School of the Environment, University of Brighton, Brighton BN2 4GJ, UK
S. M. Betz
Affiliation:
School of Geography, Queen’s University Belfast, Belfast BT7 1NN, UK
A. J. McCready
Affiliation:
Institute of Mineralogy and Petrology, University of Leoben, Austria A-8700
P. J. Murphy
Affiliation:
School of Earth Sciences and Geography, Kingston University, Kingston upon Thames KT1 2EE, UK
*
E-mail: [email protected]
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Abstract

Tidal mudflats are locally enriched in heavy metals at the head of Strangford Lough in Northern Ireland, where drainage from the hinterland enters the sea lough via a tidal canal in an urban area. To characterize the metallic contaminants and investigate their provenance, heavy particles separated from stream, canal and estuarine sediments were analysed by electron microprobe and laser Raman microspectroscopic methods. Potential metal sources are mineralization in the catchment area and industrial or domestic pollution. Anthropogenic particles include metallic grains, alloys and compounds of Pb, Zn, Cu, Fe, Cr and Sn. Alteration of metallic particles includes de-zincification of brass in freshwater sediment and replacement of Cu wire by covellite in brackish to marine sediment. Mobility of Cu, Fe and S in canal and estuarine sediments is indicated by the authigenic growth of framboidal Fe sulphide on oxide substrates and of chalcopyrite rims on covellite. Intricate colloform and platy crystalline textures suggest a cyclical deposition of covellite and chalcopyrite under conditions of varying redox and salinity. Lead and Cr mobility in the contaminated estuarine sediment is shown by the authigenic formation on Pb-rich substrates of heterogeneous Pb- and Cr-rich sulphate-phosphate compounds and Pb-oxychlorides.

Keywords

contaminated sedimentsauthigenic sulphidescovellitechalcopyritePb compoundsStrangford LoughNorthern Ireland.
Type
Research Article
Information
Mineralogical Magazine , Volume 67 , Issue 2 , April 2003 , pp. 305 - 324
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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