Microbial sulfate reduction rates and sulfur and oxygen isotope fractionations at oil and gas seeps in deepwater Gulf of Mexico

Aharon, Paul; Fu, Baoshun

doi:10.1016/s0016-7037(99)00292-6

Cited by 330 publications

(205 citation statements)

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“…7). 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.…”

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

confidence: 55%

“…Hence that oxidation of sulfide has not played a significant role in controlling the δ 34 S/δ 18 O ratios in barite. Aharon and Fu (2000) investigated the links between sulfate reduction rates and isotopic fractionation among individual point-source seeps. The δ 34 S/δ 18 O ratios from different sites varied between 1.4 and 3.5.…”

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

confidence: 99%

“…On the other hand, the Jurassic salt has a 87 Sr/ 86 Sr ratio as low as 0.7068 (Burke et al, 1982), which may influence the 87 Sr/ 86 Sr values of the pore fluids (α) factor is 1.020 (cf. Aharon and Fu, 2000). Assuming higher/lower fractionation factors (1.025/1.015) would decrease/increase the fraction of seawater sulfate needed to acquire the same level of isotopic enrichment.…”

Section: Barium Source Of the Baritesmentioning

confidence: 99%

“…On the basis of microbial sulfate reduction rates and sulfur and oxygen isotope fractionation data at seeps of the GOM, Aharon and Fu (2000) have proposed that there is a link between sulfate reduction rates and δ 34 S/δ 18 O ratios. According to this model, slower sulfate reduction rates are associated with lower δ 34 S/δ 18 O ratios while faster sulfate reduction rates are associated with progressively higher δ 34 S/δ 18 O ratios.…”

Section: Formation Model Of the Seep Baritementioning

confidence: 99%

“…In addition, the δ 34 S/δ 18 O ratios of barite serve as a promising tool for assessing the variability and diversity of sulfate reduction during the precipitation of barite (cf. Aharon and Fu, 2000). However, studies that include both δ 34 S and δ 18 O values of seep-related barites are rare, and there is disagreement on explanation of the data.…”

Section: Introductionmentioning

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 Baritementioning

confidence: 55%

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

confidence: 99%

Section: Barium Source Of the Baritesmentioning

confidence: 99%

Section: Formation Model Of the Seep Baritementioning

confidence: 99%

Section: Introductionmentioning

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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Increased Fluid Flow Activity in Shallow Sediments at the 3 km Long Hugin Fracture in the Central North Sea

Lichtschlag

Cevatoglu

Connelly

et al. 2018

Geochem Geophys Geosyst

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The North Sea hosts a wide variety of seafloor seeps that may be important for transfer of chemical species, such as methane, from the Earth's interior to its exterior. Here we provide geochemical and geophysical evidence for fluid flow within shallow sediments at the recently discovered, 3 km long Hugin Fracture in the Central North Sea. Although venting of gas bubbles was not observed, concentrations of dissolved methane were significantly elevated (up to six‐times background values) in the water column at various locations above the fracture, and microbial mats that form in the presence of methane were observed at the seafloor. Seismic amplitude anomalies revealed a bright spot at a fault bend that may be the source of the water column methane. Sediment porewaters recovered in close proximity to the Hugin Fracture indicate the presence of fluids from two different shallow (<550 m) sources: (i) a reduced fluid characterized by elevated methane concentrations and/or high levels of dissolved sulfide (up to 6 mmol L−1), and (ii) a low‐chlorinity fluid (Cl ∼305 mmol L−1) that has low levels of dissolved methane and/or sulfide. The area of the seafloor affected by the presence of methane‐enriched fluids is similar to the footprint of seepage from other morphological features in the North Sea.

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The Effects of Reactive Transport on Sulfur Isotopic Compositions in Natural Environments

Turchyn¹,

Druhan²

2022

Isotopic Constraints on Earth System Processes

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Microbial sulfate reduction rates and sulfur and oxygen isotope fractionations at oil and gas seeps in deepwater Gulf of Mexico

Cited by 330 publications

References 64 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

Increased Fluid Flow Activity in Shallow Sediments at the 3 km Long Hugin Fracture in the Central North Sea

The Effects of Reactive Transport on Sulfur Isotopic Compositions in Natural Environments

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