Sulfur isotope biogeochemistry of the Proterozoic McArthur Basin

Johnston, David T.; Farquhar, James; Summons, Roger E.; Shen, Yanan; Kaufman, Alan J.; Masterson, Andrew L.; Canfield, Donald E.

doi:10.1016/j.gca.2008.06.004

Cited by 67 publications

(33 citation statements)

References 65 publications

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“…Sediments are predominantly siliciclastic, ranging from mudrock to sandstone, that were deposited in six progradational cycles (Abbott and Sweet, 2000). High degrees of pyritization, large fractionations in sulfur isotopes and relatively small molybdenum isotope fractionations in black shales indicate that anoxia was pervasive; euxinia was at least transient in deeper parts of the basin and was possibly common along continental margins globally at this time (Jackson and Raiswell, 1991;Shen et al, 2003;Arnold et al, 2004;Johnston et al, 2008;Kendall et al, 2009;Sperling et al, 2015;Cox et al, 2016). In many areas, the rocks are essentially unmetamorphosed, having never been exposed to temperatures above the oil window (Jackson et al, 1988).…”

Section: Roper Groupmentioning

confidence: 99%

“…In support of this conclusion, kerogen and "live" oil from shales and fluid inclusions yield diverse sterane hydrocarbon biomarkers derived from eukaryotes (Summons et al, 1988;Dutkiewicz et al, 2003;Dutkiewicz et al, 2004;Volk et al, 2005;Siljeström et al, 2013; but see Flannery & George, 2014 for a contradictory finding), though most biomarkers are of prokaryotic origin. Sulfur isotope studies suggest that some of these prokaryotes metabolized by sulfate reduction (Donnelly and Crick, 1988) and sulfur disproportionation (Johnston et al, 2008).…”

Section: Roper Groupmentioning

confidence: 99%

See 1 more Smart Citation

Spatial and temporal trends in Precambrian nitrogen cycling: A Mesoproterozoic offshore nitrate minimum

Koehler

Stüeken

Kipp

et al. 2017

Geochimica et Cosmochimica Acta

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Section: Roper Groupmentioning

confidence: 99%

Section: Roper Groupmentioning

confidence: 99%

Spatial and temporal trends in Precambrian nitrogen cycling: A Mesoproterozoic offshore nitrate minimum

Koehler

Stüeken

Kipp

et al. 2017

Geochimica et Cosmochimica Acta

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“…3; Abbott and Sweet, 2000). Sedimentology (e.g., presence of glauconite), sequence stratigraphy, and pyrite sulfur isotope, Fe HR /Fe T , and DOP data suggest the Roper Group was deposited in a shelf/ramp setting in an epicratonic basin with a good connection to the global ocean, and containing a low-sulfate, stratified water column (Jackson and Raiswell, 1991;Warren et al, 1998;Abbott and Sweet, 2000;Shen et al, 2003;Johnston et al, 2008).…”

Section: Velkerri Formationmentioning

confidence: 99%

“…1.8 Ga (Canfield, 1998). Geochemical (Fe-S-C systematics, S and Mo isotopes, and Mo abundances) and biomarker evidence from intracratonic sedimentary sequences continue to accumulate in support of low-sulfate ($1.5-4.5 mM) stratified Middle Proterozoic ocean basins (Lyons et al, 2000;Shen et al, 2002Shen et al, , 2003Arnold et al, 2004;Kah et al, 2004;Poulton et al, 2004;Brocks et al, 2005;Johnston et al, 2006Johnston et al, , 2008Scott et al, 2008). However, Slack et al (2007) suggested Middle Proterozoic open-marine deep oceans were suboxic, not euxinic, based on Ce anomalies from 1.74 to 1.71 Ga hematitic chert and iron formation, and association of hematitic chert and/or iron formation with Middle Proterozoic volcanogenic massive sulfide deposits at ca.…”

Section: Introductionmentioning

confidence: 99%

Re–Os and Mo isotope systematics of black shales from the Middle Proterozoic Velkerri and Wollogorang Formations, McArthur Basin, northern Australia

Kendall

Creaser

Gordon

et al. 2009

Geochimica et Cosmochimica Acta

221

146

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“…Uncertainty in ascribing the origin of the effect to an MIE arose because two of their samples possessed Δ 36 S that was different from that of the starting materials. Uncertainty, ruling out an MIE (and demonstrating a different type of anomalous isotope effect) also arose because other processes relevant to the complex reaction pathways of thermochemical sulfate reduction (TSR) in their system involve mixing and can generate mass conservation effects (21) that have been shown to produce small variations in Δ 33 S and more significant variations in Δ 36 S (e.g., ≥2‰ in biological and biogeochemical systems (22,23).…”

mentioning

confidence: 99%

Evidence of magnetic isotope effects during thermochemical sulfate reduction

Oduro

Harms

Sintim

et al. 2011

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

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Thermochemical sulfate reduction experiments with simple amino acid and dilute concentrations of sulfate reveal significant degrees of mass-independent sulfur isotope fractionation. Enrichments of up to 13‰ for 33 S are attributed to a magnetic isotope effect (MIE) associated with the formation of thiol-disulfide, ion-radical pairs. Observed 36 S depletions in products are explained here by classical (mass-dependent) isotope effects and mixing processes. The experimental data contrasts strongly with multiple sulfur isotope trends in Archean samples, which exhibit significant 36 S anomalies. These results support an origin other than thermochemical sulfate reduction for the mass-independent signals observed for early Earth samples.anomalous | sulfur radical | thermolysis | spin-selective | hyperfine coupling S ince the report by Farquhar et al., (1) that significant deviations from the terrestrial fractionation line are observed in samples older than approximately 2.32-2.45 Ga (2, 3), considerable effort has been dedicated to identifying the origin and significance of this signal (4-10). The mass-independent signal in these ancient samples is expressed as variations in both Δ 33 S and Δ 36 S (1).* Given the observations that gas-phase reactions can produce mass-independent signals for both Δ 33 S and Δ 36 S, the first studies on this subject attributed this ancient signal to photolytic reactions in the early atmosphere. Subsequent studies also pointed out that the mass-independent reactions may also be produced by variations in the spectrum of light that drives atmospheric photolytic reactions (10-12), and other studies speculated that liquid phase reactions involving weakly bound transition states may account for these variations (7,13).In a recent report, Watanabe et al. (7) demonstrated that high temperature reduction of sulfate using alanine and glycine as organic substrates caused moderate mass-independent sulfur isotope fractionations. These authors did not identify the origin of the effect, but suggested that it was either a magnetic isotope effect (MIE) (14) or another type of isotope effect accompanying heterogeneous reactions such as adsorption of S-bearing compounds on surfaces of solids (13). Magnetic isotope effects are expressed in rare cases for isotopes with nuclear magnetic moments, like 13 C, 17 O, 29 Si, 199 Hg, 201 Hg, 73 Ge, 235 U, and 33 S (14, 15, 16). The effect is expressed when the lifetime of a radical pair is sufficient for hyperfine coupling between magnetic nuclei and unpaired electrons to influence interconversions between singlet and triplet states. This coupling in turn changes the proportion of reactive intermediates that can participate in spin-selective reactions. The 33 S nucleus has a spin of 3∕2 and a magnetic moment of 0.643 nuclear magnetons and has been implicated in at least one well-characterized example of a 33 S MIE (14,(17)(18)(19). The alternative suggestion relates to a proposal that anomalous isotope effects may be associated with heterogeneous reactions as a resu...

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Sulfur isotope biogeochemistry of the Proterozoic McArthur Basin

Cited by 67 publications

References 65 publications

Spatial and temporal trends in Precambrian nitrogen cycling: A Mesoproterozoic offshore nitrate minimum

Spatial and temporal trends in Precambrian nitrogen cycling: A Mesoproterozoic offshore nitrate minimum

Re–Os and Mo isotope systematics of black shales from the Middle Proterozoic Velkerri and Wollogorang Formations, McArthur Basin, northern Australia

Evidence of magnetic isotope effects during thermochemical sulfate reduction

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