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

De Vleeschouwer, François and Van Vliet-Lanoë, Brigitte and Fagel, Nathalie Long term mobilisation of chemical elements in tephra-rich peat (NE Iceland). (2008) Applied Geochemistry, 23 (12). 3819-3839. ISSN 0883-2927

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Official URL: http://dx.doi.org/10.1016/j.apgeochem.2008.10.006

Abstract

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.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The original PDF of the article can be found at Applied Geochemistry website http://www.sciencedirect.com/science/article/pii/S088329270800365X#
Audience (journal):International peer-reviewed journal
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Institution:Other partners > Université de Liège (BELGIUM)
Other partners > Université Lille 1, Sciences et Technologies - Lille 1 (FRANCE)
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Deposited By: François De Vleeschouwer
Deposited On:06 May 2014 10:43

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