Oxygen isotope exchange between sulphate and water during bacterial reduction of sulphate

Fritz, P.; Basharmal, G.M.; Drimmie, R.J.; Ibsen, J.; Qureshi, R.M.

doi:10.1016/0168-9622(89)90012-2

Cited by 177 publications

(232 citation statements)

References 7 publications

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“…The authors suggested that under their experimental conditions bacteria-facilitated 18 O-equilibration did occur, and they reported fractionation values of 25‰ to 29‰ at 30°C to 5°C. The δ 18 O values obtained in this study are within the limit of these values reported by Fritz et al (1989).…”

Section: Variation Of δ 34 S/δ 18 O Ratios In Baritesupporting

confidence: 71%

“…The δ 34 S/δ 18 O ratios increase with sulfate reduction rate and therefore a fixed ratio of 4:1 for δ 34 S/δ 18 O is not a reliable indicator of microbial sulfate reduction (Aharon and Fu, 2000; and this study). Fritz et al (1989) studied oxygen isotope exchange between sulfate and water during bacterial sulfate reduction. The authors suggested that under their experimental conditions bacteria-facilitated 18 O-equilibration did occur, and they reported fractionation values of 25‰ to 29‰ at 30°C to 5°C.…”

Section: Variation Of δ 34 S/δ 18 O Ratios In Baritementioning

confidence: 99%

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Geochemical characteristics of the barite deposits at cold seeps from the northern Gulf of Mexico continental slope

Dong

Roberts

2011

Earth and Planetary Science Letters

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Section: Variation Of δ 34 S/δ 18 O Ratios In Baritesupporting

confidence: 71%

Section: Variation Of δ 34 S/δ 18 O Ratios In Baritementioning

confidence: 99%

Geochemical characteristics of the barite deposits at cold seeps from the northern Gulf of Mexico continental slope

Dong

Roberts

2011

Earth and Planetary Science Letters

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“…Oxygen isotopes in sulfate, however, have been shown to be strongly influenced by the oxygen isotope composition of water in which the bacteria are grown (41)(42)(43)(44)(45). The consensus is that, within the cell, sulfur compounds, such as sulfite, and water exchange oxygen atoms; some of these isotopically equilibrated molecules return to the extracellular sulfate pool.…”

Section: Significancementioning

confidence: 99%

Iron oxides stimulate sulfate-driven anaerobic methane oxidation in seeps

Sivan

Antler

Turchyn

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

123

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Seep sediments are dominated by intensive microbial sulfate reduction coupled to the anaerobic oxidation of methane (AOM). Through geochemical measurements of incubation experiments with methane seep sediments collected from Hydrate Ridge, we provide insight into the role of iron oxides in sulfate-driven AOM. Seep sediments incubated with 13 C-labeled methane showed cooccurring sulfate reduction, AOM, and methanogenesis. The isotope fractionation factors for sulfur and oxygen isotopes in sulfate were about 40‰ and 22‰, respectively, reinforcing the difference between microbial sulfate reduction in methane seeps versus other sedimentary environments (for example, sulfur isotope fractionation above 60‰ in sulfate reduction coupled to organic carbon oxidation or in diffusive sedimentary sulfate-methane transition zone). The addition of hematite to these microcosm experiments resulted in significant microbial iron reduction as well as enhancing sulfate-driven AOM. The magnitude of the isotope fractionation of sulfur and oxygen isotopes in sulfate from these incubations was lowered by about 50%, indicating the involvement of iron oxides during sulfate reduction in methane seeps. The similar relative change between the oxygen versus sulfur isotopes of sulfate in all experiments (with and without hematite addition) suggests that oxidized forms of iron, naturally present in the sediment incubations, were involved in sulfate reduction, with hematite addition increasing the sulfate recycling or the activity of sulfur-cycling microorganisms by about 40%. These results highlight a role for natural iron oxides during bacterial sulfate reduction in methane seeps not only as nutrient but also as stimulator of sulfur recycling.redox | anaerobic respiration | deep-sea | methanotrophy | ANME archaea M icrobial dissimilatory processes generate energy through the decomposition of substrates, whereas assimilatory processes use substrates for intracellular biosynthesis of macromolecules. The most known and energetically favorable dissimilatory process is the oxidation of organic carbon coupled to oxygen as terminal electron acceptor (Eq. 1). In sediments with a high supply of organic carbon, oxygen can be depleted within the upper few millimeters, leading to anoxic conditions deeper in the sediment column. Under these conditions, microbial dissimilatory processes are coupled to the reduction of a series of other terminal electron acceptors besides oxygen (1). The largest free-energy yields are associated with nitrate reduction (denitrification), followed by manganese and iron oxide reduction, and then sulfate reduction. Due to the high concentration of sulfate in the ocean, dissimilatory bacterial sulfate reduction (Eq. 2) is responsible for the majority of organic matter oxidation in marine sediments (2). Below the depth of sulfate depletion, traditionally the only presumed process is methanogenesis (methane production), where its main pathways are fermentation of organic matter, mainly acetate (Eq. 3), or the reduction of carbon di...

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“…The isotopic enrichment observed in the SO 2À 4 pool can vary from 4‰ to 46‰ depending on the bacterial species involved, the supply of SO 4 , the rate of SO 4 reduction, temperature and pH (Kemp and Thode, 1968;Fritz et al, 1989;Clark and Fritz, 1997). The enrichment of 18 O during bacterial SO 4 reduction is 2.5-4 times less than that of 34 S, but the enrichment increases throughout the reaction until it plateaus (Fritz et al, 1989;Pierre, 1989).…”

Section: Seasonal Dic Contributionsmentioning

confidence: 99%

“…The enrichment of 18 O during bacterial SO 4 reduction is 2.5-4 times less than that of 34 S, but the enrichment increases throughout the reaction until it plateaus (Fritz et al, 1989;Pierre, 1989). All of the water samples collected at this site showed higher d 34 S SO4 and d 18 O SO4 signatures compared to other groundwaters of the region (Fig.…”

Section: Seasonal Dic Contributionsmentioning

confidence: 99%

Isotopic evidence of enhanced carbonate dissolution at a coal mine drainage site in Allegheny County, Pennsylvania, USA

Sharma

Sack

Adams

et al. 2013

Applied Geochemistry

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Editorial handling by A. Kolker a b s t r a c t Stable isotopes were used to determine the sources and fate of dissolved inorganic C (DIC) in the circumneutral pH drainage from an abandoned bituminous coal mine in western Pennsylvania. The C isotope signatures of DIC (d 13 C DIC ) were intermediate between local carbonate and organic C sources, but were higher than those of contemporaneous Pennsylvanian age groundwaters in the region. This suggests a significant contribution of C enriched in 13 C due to enhanced carbonate dissolution associated with the release of H 2 SO 4 from pyrite oxidation. The Sr isotopic signature of the drainage was similar to other regional mine waters associated with the same coal seam and reflected contributions from limestone dissolution and cation exchange with clay minerals. The relatively high d 34 S SO4 and d 18 O SO4 isotopic signatures of the mine drainage and the presence of presumptive SO 4 -reducing bacteria suggest that SO 4 reduction activity also contributes C depleted in 13 C isotope to the total DIC pool. With distance downstream from the mine portal, C isotope signatures in the drainage increased , accompanied by decreased total DIC concentrations and increased pH. These data are consistent with H 2 SO 4 dissolution of carbonate rocks, enhanced by cation exchange, and C release to the atmosphere via CO 2 outgassing.

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Oxygen isotope exchange between sulphate and water during bacterial reduction of sulphate

Cited by 177 publications

References 7 publications

Geochemical characteristics of the barite deposits at cold seeps from the northern Gulf of Mexico continental slope

Geochemical characteristics of the barite deposits at cold seeps from the northern Gulf of Mexico continental slope

Iron oxides stimulate sulfate-driven anaerobic methane oxidation in seeps

Isotopic evidence of enhanced carbonate dissolution at a coal mine drainage site in Allegheny County, Pennsylvania, USA

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