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Sources of iron for pyrite formation in marine sediments

Raiswell, R. and Canfield, D.E. (1998) Sources of iron for pyrite formation in marine sediments. American Journal of Science, 298 (3). pp. 219-245. ISSN 0002-9599

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Abstract

More than two hundred aerobic continental margin, aerobic deep sea, dysaerobic, and anaerobic / euxinic sediments have been examined for their variations in different operationally defined iron fractions, each of which represents a different reactivity towards dissolved sulfide. Aerobic continental margin, deep sea, and dysaerobic sediments contain similar contents of highly reactive iron (dithionite-soluble iron plus pyrite iron), poorly reactive iron (iron soluble in HCl less that soluble in dithionite), and unreactive iron (total iron less that soluble in HCl). By contrast non-turbidite euxinic samples from the Black Sea, as well as euxinic samples from the Cariaco Basin and Framvaren are enriched in highly reactive iron. These sediments contain a small lithogenous fraction and a large biogenous, organic C-rich fraction, which decays by sulphate reduction in an iron-rich water column to form pyrite-rich sediment. Other anaerobic / euxinic samples from the Black Sea, Orca Basin, and Kau Bay contain lower concentrations of biogenous sediment and are not therefore enriched in highly reactive iron. Degrees of Pyritization (DOP) for all the aerobic, dysaerobic, and anaerobic/euxinix samples (except those low in biogenous material) are consistent with analogous ancient sediments and indicate that most pyrite formation occurs form the highly reactive iron fraction.

Item Type: Article
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds)
Depositing User: Sherpa Assistant
Date Deposited: 11 Mar 2005
Last Modified: 04 Jun 2014 10:56
Published Version: http://www.geology.yale.edu/journals/Ajs.html/
Status: Published
Refereed: Yes
URI: http://eprints.whiterose.ac.uk/id/eprint/335

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