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Preliminary reconstruction of sediment-source linkages for the past 6000 yr at the Petit Lac d'Annecy, France, based on mineral magnetic data

Dearing, John, Hu, Yuquan, Doody, Pippa, James, Peter A. and Brauer, Achim (2001) Preliminary reconstruction of sediment-source linkages for the past 6000 yr at the Petit Lac d'Annecy, France, based on mineral magnetic data Journal of Paleolimnology, 25, (2), pp. 245-258. (doi:10.1023/A:1008186501993).

Record type: Article

Abstract

An 8 m core from the central plain of the Petit Lac d’Annecy, France, two floodplain cores, river bedload sediments and several hundred soil samples from the catchment have been studied using magnetic techniques. The soils, mainly developed on limestones and local glacial tills, show widespread magnetic enhancement with higher ferrimagnetic concentrations and contents of superparamagnetic grains than found in the lake sediments. Some soils show significant concentrations of canted antiferromagnetic minerals (mainly haematite). Using magnetic quotient parameters the surface soils are classified into four mineralogical types. The lake and floodplain sediment properties over the past 6000 yrs can largely be explained by the erosion and deposition of these sources, with a smaller superimposed biogenic (magnetosomes) signal. Derived sediment-source linkages allow the construction of several hypotheses about geomorphological changes in the catchment system: (i) the long-term erosion of high altitude unweathered substrates has gradually increased towards the present day; (ii) the erosion of high altitude soils has increased within the last 1000 yrs, possibly during the period of the ‘Little Ice Age’; (iii) shifts towards an increased erosion of surface lowland soil occurred ~2000 and 1000 yrs ago and may be linked to an accelerated accretion of floodplain overbank deposits; (iv) there has been a significant storage of surface soil within floodplains, which leads to an underestimation of the importance of soil erosion in the lake sediment records; (v) the sediment transported by high magnitude, low frequency flood events has shifted in source from high altitude soils before ~1000 cal. yr BP to lowland and mid-altitude free draining soils after ~1000 cal. yr BP.

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Published date: February 2001
Keywords: Holocene, Lac d’Annecy, lake sediments, mineral magnetism, soil magnetism, sediment-source linkages, soil erosion

Identifiers

Local EPrints ID: 55631
URI: http://eprints.soton.ac.uk/id/eprint/55631
ISSN: 0921-2728
PURE UUID: b776cbcf-ebe7-4a46-a694-7fe0f5d44b47
ORCID for John Dearing: ORCID iD orcid.org/0000-0002-1466-9640

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Date deposited: 04 Aug 2008
Last modified: 17 Jul 2017 14:32

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Contributors

Author: John Dearing ORCID iD
Author: Yuquan Hu
Author: Pippa Doody
Author: Peter A. James
Author: Achim Brauer

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