Long term mobilisation of chemical elements in tephra-rich peat (NE Iceland)

De Vleeschouwer, François; Lanoe, Brigitte Van Vliet; Fagel, Nathalie

doi:10.1016/j.apgeochem.2008.10.006

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Long term mobilisation of chemical elements in tephra-rich peat (NE Iceland)

De Vleeschouwer, François; Lanoe, Brigitte Van Vliet; Fagel, Nathalie

2008 • In Applied Geochemistry, 23 (12), p. 3819-3839

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https://hdl.handle.net/2268/23305

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10.1016/j.apgeochem.2008.10.006

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Keywords :

Iceland; peat; tephra

Abstract :

[en] This paper presents geochemical profiles of a tephra-bearing minerotrophic peat column from NE-Iceland obtained using various elemental analyses of the solid phase and the pore water. The influence of tephra grain size, thickness and composition of each tephra on the peat geochemistry was investigated. Interpretations are supported by a statistical approach, in particular by autocorrelation, and by microscopy observations. Minerotrophic peat geochemistry may be strongly dependent upon post-depositional mobilization and possible leaching of elements as demonstrated by Fe and trace metal concentration profiles. Chemical elements, and more specifically potentially harmful metals, can be slowly leached out of volcanic falls during their weathering and re-accumulate downwards. It is emphasised that a tephra deposit can act as an active geochemical barrier, blocking downward elemental movements and leading to the formation of enriched layers. In this study, the formation of poorly amorphous Fe phases above the Hekla 3 tephra is shown. These poorly crystalline Fe phases scavenged Ni. (c) 2008 Elsevier Ltd. All rights reserved.

Disciplines :

Earth sciences & physical geography

Author, co-author :

De Vleeschouwer, François

Lanoe, Brigitte Van Vliet

Fagel, Nathalie ; Université de Liège - ULiège > Département de géologie > Argiles, géochimie et environnements sédimentaires

Language :

English

Title :

Long term mobilisation of chemical elements in tephra-rich peat (NE Iceland)

Publication date :

2008

Journal title :

Applied Geochemistry

ISSN :

0883-2927

Publisher :

Pergamon Press - An Imprint of Elsevier Science

Volume :

Issue :

Pages :

3819-3839

Peer reviewed :

Peer Reviewed verified by ORBi

Funders :

FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture [BE]
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]

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