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

S. H. Bottrell, R. J. Parkes, B. A. Cragg and R. Raiswell
Isotopic evidence for anoxic pyrite oxidation and stimulation of bacterial sulphate reduction in marine sediments
Journal of the Geological Society of London (July 2000) 157, Part 4: 711-714

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 delta (super 34) S and delta (super 18) O 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. Fe (super 3+) 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.


ISSN: 0016-7649
EISSN: 2041-479X
Coden: JGSLAS
Serial Title: Journal of the Geological Society of London
Serial Volume: 157, Part 4
Title: Isotopic evidence for anoxic pyrite oxidation and stimulation of bacterial sulphate reduction in marine sediments
Affiliation: University of Leeds, School of Earth Sciences, Leeds, United Kingdom
Pages: 711-714
Published: 200007
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 26
Accession Number: 2000-054427
Categories: Isotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch map
N48°09'59" - N48°10'01", W126°39'48" - W126°39'43"
N48°41'51" - N48°41'59", W126°52'23" - W126°52'06"
N48°39'45" - N48°39'45", W126°52'53" - W126°52'53"
Secondary Affiliation: University of Bristol, Department of Earth Sciences, Bristol, GBR, United Kingdom
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 200018
Program Name: ODPOcean Drilling Program
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