Iron reduction through the tangreen transition in deep-sea sediments.

König, I., Drodt, M., Suess, Erwin and Trautwein, A. X. (1997) Iron reduction through the tangreen transition in deep-sea sediments. Geochimica et Cosmochimica Acta, 61 (8). pp. 1679-1683. DOI 10.1016/S0016-7037(97)00007-0.

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Abstract

Mössbauer spectroscopic investigations of deep-sea sediments from the Peru Basin revealed a prominent downcore increase of the bulk sediment Fe(II)/Fe(III) ratio across the well-known tan-green color transition. This increase occurs along a continuous gradient extending over a 3 cm zone at the two deep-sea sites that we report. Remarkably constant values of the Fe(II)/Fe(III) ratios above (11 ± 2%/89 ± 2%) and below (37 ± 2%/63 ± 2%) the iron redox transition-zone delimit the gradient clearly. A minor peak of diagenetic iron enrichment is manifest at the redox front. This Fe enrichment has accumulated in a redox cycle and amounts to 16 ± 4% of the total Fe at the peak maximum. The data imply that 26 ± 4% of the detrital iron has experienced in situ redox transition from Fe(III) to Fe(II) within the iron redox transition-zone.

Document Type: Article
Keywords: Iron reduction, tangreen transition, deep-sea sediments, Peru Basin
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/S0016-7037(97)00007-0
ISSN: 0016-7037
Date Deposited: 18 Feb 2008 17:24
Last Modified: 26 Sep 2017 12:12
URI: http://oceanrep.geomar.de/id/eprint/6926

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