THE USE OF OVERBANK SEDIMENT FOR GEOCHEMICAL MAPPING AND CONTAMINATION ASSESSMENT - RESULTS FROM SELECTED ENGLISH AND WELSH FLOODPLAINS

被引：112

作者：

MACKLIN, MG

RIDGWAY, J

PASSMORE, DG

RUMSBY, BT

机构：

[1] Department of Geography, University of Newcastle, Newcastle upon Tyne

[2] British Geological Survey, Keyworth, Nottingham

[3] Department of Geography, University of Newcastle, Newcastle upon Tyne

[4] Geography Laboratory, University of Sussex, Falmer, Brighton, Sussex BN1 9QN, The Arts Building

来源：

APPLIED GEOCHEMISTRY | 1994年 / 9卷 / 06期

关键词：

Anthropogenic influences - Catchment - Floodplains - Geochemical mapping - Overbank sediments - Tyne basin;

D O I：

10.1016/0883-2927(94)90028-0

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

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 cathment by human activity. These considerations and associated costs may render overbank sediment non-viable as a regional geochemical mapping medium.

引用

页码：689 / 700

页数：12

共 28 条

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