Reactive Fe (II) layers in deep-sea sediments.

König, Iris, Haeckel, Matthias , Drodt, M., Suess, Erwin and Trautwein, A. X. (1999) Reactive Fe (II) layers in deep-sea sediments. Geochimica et Cosmochimica Acta, 63 (10). pp. 1517-1526. DOI 10.1016/S0016-7037(99)00104-0.

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Abstract

The percentage of the structural Fe(II) in clay minerals that is readily oxidized to Fe(III) upon contact with atmospheric oxygen was determined across the downcore tan–green color change in Peru Basin sediments. This latent fraction of reactive Fe(II) was only found in the green strata, where it proved to be large enough to constitute a deep reaction layer with respect to the pore water O2 and NO3−. Large variations were detected in the proportion of the reactive Fe(II) concentration to the organic matter content along core profiles. Hence, the commonly observed tan–green color change in marine sediments marks the top of a reactive Fe(II) layer, which may represent the major barrier to the movement of oxidation fronts in pelagic subsurface sediments. This is also demonstrated by numerical model simulations. The findings imply that geochemical barriers to pore water oxidation fronts form diagenetically in the sea floor wherever the stage of iron reduction is reached, provided that the sediments contain a significant amount of structural iron in clay minerals.

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/S0016-7037(99)00104-0
ISSN: 0016-7037
Date Deposited: 18 Feb 2008 17:24
Last Modified: 25 Aug 2017 08:03
URI: http://oceanrep.geomar.de/id/eprint/6988

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