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Journal of the Geological Society; 2000; v. 157; issue.4; p. 711-714
© 2000 Geological Society of London

Specials

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

S. H. BOTTRELL, R. J. PARKES, B. A. CRAGG & R. RAISWELL

1 School of Earth Sciences, University of Leeds, Leeds LS2 9JT, UK (e-mail: simon{at}earth.leeds.ac.uk)
2 Department of Earth Sciences, University of Bristol, Bristol BS8 1RJ, UK

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}34S and {delta}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.


Keywords: anoxic environment, pore water, pyrite, oxidation, stable isotopes.




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