The use of overbank sediment for geochemical mapping and contamination assessment: results from selected English and Welsh floodplains

Macklin, M. G. and Ridgway, J. and Passmore, D. G. and Rumsby, B. T. (1994) The use of overbank sediment for geochemical mapping and contamination assessment: results from selected English and Welsh floodplains. Applied Geochemistry, 9 (6). pp. 689-700. ISSN 0883-2927

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Item Type:Article
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Abstract

Overbank sediment profiles from floodplains in England and Wales contain a record of both natural geochemical patterns and those showing the influence of man's activities. It has been suggested that this characteristic can be used to allow maps to be compiled which show human impact on the fluvial geochemical environment. Studies reviewed in this paper, however, show that a single overbank profile very rarely spans the period from before anthropogenic disturbance through to the Industrial Revolution and later. Significant lateral variations in metal concentrations occur also over a relatively small area in overbank sediments of the same general age. These, and the nature of vertical changes in chemistry, make the choice of sample sites, and sampling interval within a profile, difficult. Even sediments which appear uncontaminated may record anthropogenic influences from activities such as deforestation and agriculture. A means of dating the sediment and an appreciation of river erosion and sedimentation histories are shown to be essential in order to ensure that maps intended to depict natural geochemical variations are based on material deposited before disturbance of the catchment by human activity. These considerations and associated costs may render overbank sediment non-viable as a regional geochemical mapping medium. © 1994 Elsevier Science Ltd.

Keywords:anthropogenic impact, contaminant, erosion, floodplain, geochemical mapping, mining, overbank sediment, UK, England, UK, England, Wales, UK, Wales, Contamination, Geochemistry, Geochronology, Geological surveys, Maps, Rivers, Sampling, Sedimentation, Anthropogenic influences, Catchment, Floodplains, Overbank sediments, Tyne basin, Sediments
Subjects:F Physical Sciences > F840 Physical Geography
Divisions:College of Science > School of Geography
ID Code:25151
Deposited On:25 Nov 2016 11:32

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