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Isotopic evidence for anoxic pyrite oxidation and stimulation of bacterial sulphate reduction in marine sediments

Bottrell, S. H., Parkes, Ronald John, Cragg, Barry Andrew and Raiswell, R. 2000. Isotopic evidence for anoxic pyrite oxidation and stimulation of bacterial sulphate reduction in marine sediments. Journal of the Geological Society 157 (4) , pp. 711-714. 10.1144/jgs.157.4.711

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Abstract

Pore-water sulphate concentrations show marked increases at depths >50 m at ODP sites 888 and 890/889 from the Cascadia Margin accretionary wedge. In the uppermost 10 m sulphate concentrations decrease with depth and sulphate 34S and 18O increase as sulphate is removed by bacterial sulphate reduction. Isotopic data show that sulphate formed below 50 m results from oxidation of early diagenetic pyrite and that oxygen in the sulphate molecules is derived from pore water. Fe3+ in the sediment is the probable oxidizing agent. The increased sulphate concentrations stimulate bacterial sulphate reduction at depths of 70–250 m and are thus important in sustaining deep bacterial activity.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: Q Science > QR Microbiology
Uncontrolled Keywords: anoxic environment, pore water, pyrite, oxidation, stable isotopes
Publisher: Geological Society of London
ISSN: 0016-7649
Last Modified: 12 Jun 2019 02:19
URI: http://orca-mwe.cf.ac.uk/id/eprint/9455

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