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Holocene sulphur-rich palaeochannel sediments: diagenetic conditions, magnetic properties and archaeological implications

Record type: Article

Extensive aggregate extraction in the middle Trent valley, England, has revealed a sequence of Holocene palaeochannels associated with nationally important, and predominantly organic, archaeological remains. This paper reports observations of hyper-acidity (below pH 2), high natural magnetism and metallic sphaerules (framboids) in Holocene palaeochannel sediments at two sites in the middle Trent valley. These properties are associated with high natural remanent magnetism which has allowed the successful palaeomagnetic dating of palaeochannel fills at one of these sites (Hemington). These sediment properties are the result of the formation of ferromagnetic iron sulphides, including griegite, under conditions of high sulphur availability (from groundwater) in the presence of metallic ions and organic matter under low redox conditions, with later oxidation producing the extreme natural acidity through oxidation of disulphide (pyrite). These findings explain why, under certain groundwater conditions, alluvial palaeochannel sediments can carry post-depositional remanent magnetisation and be suitable for palaeomagnetic dating. The low pH may also be beneficial in the initial stage of wood preservation and if the sediments remain waterlogged, but probably not retard decomposition after drainage and acidification, a process that is increasingly being recognised as a threat to archaeological sites in wetland environments

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Citation

Brown, A.G., Ellis, C. and Roseff, R. (2009) Holocene sulphur-rich palaeochannel sediments: diagenetic conditions, magnetic properties and archaeological implications Journal of Archaeological Science, 9pp. (doi:10.1016/j.jas.2009.08.009).

More information

Published date: 4 September 2009
Keywords: palaeochannels, iron sulphides, diagenesis, framboids, palaeomagnetic dating

Identifiers

Local EPrints ID: 69009
URI: http://eprints.soton.ac.uk/id/eprint/69009
ISSN: 0305-4403
PURE UUID: 45f8aa34-2c13-4734-ab65-b650bdf840de

Catalogue record

Date deposited: 20 Oct 2009
Last modified: 19 Jul 2017 00:14

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Contributors

Author: A.G. Brown
Author: C. Ellis
Author: R. Roseff

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