A methodological framework to study the behavior and kinetic influence of V, Mn, Co, Ni, Cu, Zn, As, Se and Mo during pyrite formation via the polysulfide pathway at ambient temperature

Baya, Camille; Pape, Pierre Le; Menguy, Nicolas; Delbes, Ludovic; Morand, M.; Rouelle, M.; Aubry, Emmanuel; Ona-Nguéma, Georges; Noël, Vincent; Juillot, Farid; Morin, Guillaume

doi:10.1016/j.chemgeo.2022.121139

Cited by 3 publications

(2 citation statements)

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“…Rates of pyrite nucleation and subsequent growth can also be affected by trace metal inventories. For example, at a trace element to Fe molar ratio of 0.1%-0.5%, Mn and Ni decrease the time required for pyrite nucleation by 60% and 80%-99%, respectively (Baya et al, 2021(Baya et al, , 2022. The western shoal in this area generally has more Mn and more Ni (∼1.5% Mn/Fe and ∼0.09% Ni/Fe) than the channel does (∼0.6% Mn/Fe and ∼0.04% Ni/Fe), which accordingly may induce faster pyrite nucleation in shoal sediments (Sinex & Helz, 1981).…”

Section: Apparent Disparity In Pyrite Formation Rates Between Sitesmentioning

confidence: 99%

“…The activity of SOM may alter the concentrations of certain trace metals that affect pyrite precipitation rates. For example, arsenic slows down pyrite nucleation and crystal growth; addition of As to 0.1%-0.5% of Fe increases pyrite nucleation time by 70%-140%, and As also increases the time required for pyrite to become the dominant Fe-S mineral in its batch from 14 days to over 4 months (Baya et al, 2021(Baya et al, , 2022). An As-induced lag time of 4 months could strongly influence our study sites, where net surficial pyrite accumulation is limited to seasonal timescales.…”

Section: Apparent Disparity In Pyrite Formation Rates Between Sitesmentioning

confidence: 99%

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Sedimentary Pyrite Formation in a Seasonally Oxygen‐Stressed Estuary: Potential Imprints of Microbial Ecology and Position‐Specific Isotope Fractionation

et al. 2023

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Sulfur-cycling microorganisms are fundamental agents in sedimentary pyrite formation. The compounds that form pyrite include iron monosulfide (FeS), hydrogen sulfide (H 2 S), and polysulfide (S n 2−) (Butler et al., 2004), which are formed and consumed by microbially catalyzed reactions (sulfate reduction, sulfide oxidation, and elemental sulfur disproportionation) along with abiotic reactions. However, the role of microbes in pyrite precipitation also likely extends beyond simply generating the necessary reactant compounds (Picard et al., 2016;Wacey et al., 2015). For example, pyrite formation proceeds in some cases via the activity of microbial consortia (Thiel Abstract Sedimentary pyrite records are essential for reconstructing paleoenvironmental conditions, but these records may be affected by seasonal fluctuations in oxygen concentration and temperature, which can impact bioturbation, sulfide fluxes, and distributions of sulfide oxidizing microbes (SOMs). To investigate how seasonal oxygen stress influences surficial (<2 cm) pyrite formation, we measured time-series concentrations and sulfur isotope (δ 34 S) compositions of pyrite sulfur along with those of potential precursor compounds at a bioturbated shoal site and an oxygen-deficient channel site in Chesapeake Bay. We also measured radioisotope depth profiles to estimate sedimentation rates and bioturbation intensities. Results show that net pyrite precipitation was restricted to summer and early autumn at both sites. Pyrite concentration was higher and apparently more responsive to precursor compound concentration at the mildly bioturbated site than at the non-bioturbated site. This disparity may be driven by differences in the dominant SOM communities between the two sites. Despite this, the sites' similar pyrite δ 34 S values imply that changes in SOM communities have limited effects on surficial pyrite δ 34 S values here. However, we found that pyrite δ 34 S values are consistently and anomalously lower than coeval precursor compounds at both sites. A steady-state model demonstrates that equilibrium position-specific isotope fractionation (PSIF) effects in the S 8 -polysulfide pool can create a 4.3-7.3‰ gap between δ 34 S values of pyrite and zero-valent sulfur. This study suggests that SOM communities may have distinct effects on pyrite accumulation in seasonally dynamic systems, and that PSIF in the polysulfide pool may leave an imprint in pyrite isotope records.Plain Language Summary Formation of the iron sulfide mineral pyrite in sediments has contributed to long-term oxygen accumulation on Earth, and pyrite's sulfur isotope composition in ancient sediments offers a lens onto low-oxygen intervals in Earth's past. However, seasonal environmental changes in low-oxygen waters can lead to complex relationships between animal burrowing activity, microbial processing of sulfur compounds, and the formation of pyrite. To understand controls on pyrite accumulation and sulfur isotope composition under seasonally dynamic, low-oxygen waters, we analyzed shal...

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Section: Apparent Disparity In Pyrite Formation Rates Between Sitesmentioning

confidence: 99%

Section: Apparent Disparity In Pyrite Formation Rates Between Sitesmentioning

confidence: 99%

Sedimentary Pyrite Formation in a Seasonally Oxygen‐Stressed Estuary: Potential Imprints of Microbial Ecology and Position‐Specific Isotope Fractionation

et al. 2023

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Sulfides in waters could be converted to pyrites through mineralization with Fe/MgO/Ni(Ⅱ) promotion

Wang,

Li,

Liu

et al. 2024

Chemical Engineering Journal

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A Machine-Learning Approach to Biosignature Exploration on Early Earth and Mars Using Sulfur Isotope and Trace Element Data in Pyrite

Figueroa,

Gregory,

Williford

et al. 2024

Astrobiology

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A methodological framework to study the behavior and kinetic influence of V, Mn, Co, Ni, Cu, Zn, As, Se and Mo during pyrite formation via the polysulfide pathway at ambient temperature

Cited by 3 publications

References 117 publications

Sedimentary Pyrite Formation in a Seasonally Oxygen‐Stressed Estuary: Potential Imprints of Microbial Ecology and Position‐Specific Isotope Fractionation

Sedimentary Pyrite Formation in a Seasonally Oxygen‐Stressed Estuary: Potential Imprints of Microbial Ecology and Position‐Specific Isotope Fractionation

Sulfides in waters could be converted to pyrites through mineralization with Fe/MgO/Ni(Ⅱ) promotion

A Machine-Learning Approach to Biosignature Exploration on Early Earth and Mars Using Sulfur Isotope and Trace Element Data in Pyrite

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