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- Title
Mineral magnetic characterization of sediment sources from an analysis of lake and floodplain sediments in the catchments of the Old Millreservoir and Slapton Ley, South Devon, UK
- Authors
Walling, D. E.; Lees, J. A.; Foster, I. D. L.; Owens, P. N.
- Abstract
Research on suspended sediment transport in the catchments of the Old Mill reservoir and Slapton Lower Ley, South Devon, has attempted todiscriminate changing catchment sources on the basis of downcore variations in the mineral magnetic properties of lake, reservoir and floodplain sediments. Here, we examine these downcore variations and also explore the variability in catchment sources and the influence of topographic controls on mineral magnetic signatures of topsoils and subsoils. Particle size controls on the mineral magnetic signatures areexplored by an analysis of a fractionated sediment sample, whilst the possible impact of diagenesis is assessed by an examination of the Mn profiles in the lake and reservoir sediments. From this analysis it is evident that the mineral magnetic signatures of well sorted floodplain deposits are more likely to reflect the particle size composition of the transported material. By contrast, the mineral magnetic record in the sediment of Slapton Ley appears to be most strongly influenced by dissolution of magnetic minerals. The sediment of the Old Mill reservoir provides the only suitable record for the application ofa simple mixing model which is developed in order to quantify changes in the relative contribution of topsoil and subsoil through time. The research has important implications for attempting to reconstruct sediment sources in highly eutrophic lakes and emphasizes the uncertainty in the application of simple mixing models.
- Subjects
LIMNOLOGY; MANGANESE; SEDIMENTOLOGY; SOIL science; PARTICLE size distribution; GEOMORPHOLOGY
- Publication
Earth Surface Processes & Landforms, 1998, Vol 23, Issue 8, p685
- ISSN
0197-9337
- Publication type
Article