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• W4210768356 abstract "The sulfur isotope composition of pyrite in marine sedimentary rocks is often difficult to interpret due to a lack of precise isotopic constraints for coeval sulfate. This study examines pyrite and barite in the Late Devonian Canol Formation (Selwyn Basin, Canada), which provides an archive of δ 34 S and δ 18 O values during diagenesis. Scanning electron microscopy (SEM) has been combined with microscale secondary ion mass spectrometry (SIMS) analysis ( n = 1,032) of pyrite (δ 34 S) and barite (δ 34 S and δ 18 O) on samples collected from nine stratigraphic sections of the Canol Formation. Two paragenetic stages of pyrite and barite formation have been distinguished, both replaced by barium carbonate and feldspar. The δ 34 S barite and δ 18 O barite values from all sections overlap, between +37.1‰ and +67.9‰ (median = +45.7‰) and +8.8‰ and +23.9‰ (median = +20.0‰), respectively. Barite morphologies and isotopic values are consistent with precipitation from diagenetically modified porewater sulfate (sulfate resupply &lt;&lt; sulfate depletion) during early diagenesis. The two pyrite generations (Py-1 and Py-2) preserve distinct textures and end-member isotopic records. There is a large offset from coeval Late Devonian seawater sulfate in the δ 34 S pyrite values of framboidal pyrite (-29.4‰ to -9.3‰), consistent with dissimilatory microbial sulfate reduction (MSR) during early diagenesis. The Py-2 is in textural equilibrium with barite generation 2 (Brt-2) and records a broad range of more positive δ 34 S Py-2 values (+9.4‰ to + 44.5‰). The distinctive highly positive δ 34 S pyrite values developed from sulfate limited conditions around the sulfate methane transition zone (SMTZ). We propose that a combination of factors, including low sulfate concentrations, MSR, and sulfate reduction coupled to anaerobic oxidation of methane (SR-AOM), led to the formation of highly positive δ 34 S pyrite and δ 34 S barite values in the Canol Formation. The presence of highly positive δ 34 S pyrite values in other Late Devonian sedimentary units indicate that diagenetic pyrite formation at the SMTZ may be a more general feature of other Lower Paleozoic basins." @default.
• W4210768356 created "2022-02-08" @default.
• W4210768356 creator A5003516221 @default.
• W4210768356 creator A5088228609 @default.
• W4210768356 creator A5088233618 @default.
• W4210768356 creator A5088933277 @default.
• W4210768356 creator A5091712441 @default.
• W4210768356 date "2022-02-02" @default.
• W4210768356 modified "2023-10-02" @default.
• W4210768356 title "The Formation of Highly Positive δ34S Values in Late Devonian Mudstones: Microscale Analysis of Pyrite (δ34S) and Barite (δ34S, δ18O) in the Canol Formation (Selwyn Basin, Canada)" @default.
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