Tracing the evolution of seep fluids from authigenic carbonates: Green Canyon, northern Gulf of Mexico

Bian, Youyan; Dong, Feng; Roberts, Harry H.; Chen, Duofu

doi:10.1016/j.marpetgeo.2013.03.010

Cited by 28 publications

(22 citation statements)

References 91 publications

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“…therein). Additionally, positive δ 13 C values might also indicate the formation of seep carbonates in deep subsurface sediments Bian et al, 2013), which is in good agreement with our interpretation of the positive oxygen isotope composition of the brown facies and the deep origin of the oil demonstrated by the bitumen characterization data presented in this study.…”

Section: A C C E P T E D Accepted Manuscriptsupporting

confidence: 92%

Deep-seated hydrocarbons in the seep “Brecciated Limestones” of the Maiella area (Adriatic foreland basin): Evaporitic sealing and oil re-mobilization effects linked to the drawdown of the Messinian Salinity Crisis

Iadanza

Sampalmieri

Cipollari

2015

Marine and Petroleum Geology

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Section: A C C E P T E D Accepted Manuscriptsupporting

confidence: 92%

Deep-seated hydrocarbons in the seep “Brecciated Limestones” of the Maiella area (Adriatic foreland basin): Evaporitic sealing and oil re-mobilization effects linked to the drawdown of the Messinian Salinity Crisis

Iadanza

Sampalmieri

Cipollari

2015

Marine and Petroleum Geology

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“…The impact of microbial anaerobic degradation of higher hydrocarbons and crude oils on carbonate precipitation is less well constrained. Numerous studies on northern GoM hydrocarbon seeps have shown that expulsions of liquid oil do not impede the development of lush chemosynthesis-based macrofaunal and microbial communities (Kennicutt et al, 1988b;Sassen et al, 1993) and that oil seeps are sites of pronounced formation of authigenic carbonates (Brooks et al, 1986;Formolo et al, 2004;Mansour & Sassen, 2011;Bian et al, 2013;Feng et al, 2014). Yet, the toxicity and viscosity of oil restricts the variability of feasible niches and impacts the composition of the local macrofauna and microfauna and governs the diversity and distribution of microbial communities (Orcutt et al, 2010).…”

Section: Anaerobic Oxidation Of Hydrocarbons As a Trigger For Carbonamentioning

confidence: 99%

Oil seepage and carbonate formation: A case study from the southern Gulf of Mexico

et al. 2019

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Oil seeps from the southern Gulf of Mexico can be regarded as natural laboratories where the effect of crude oil seepage on chemosynthesis‐based communities and carbonate precipitation can be studied. During R/V Meteor cruise 114 the seep sites UNAM (Universidad Nacional Autónoma de México) Ridge, Mictlan Knoll and Tsanyao Yang Knoll (Bay of Campeche, southern Gulf of Mexico) were investigated and sampled for authigenic carbonate deposits containing large amounts of liquid oil and solid asphalt. The δ13C values of individual carbonate phases including: (i) microcrystalline matrix aragonite and calcite; (ii) grey, cryptocrystalline to microcrystalline aragonite; and (iii) clear, fibrous aragonite cement, are between −30‰ and −20‰, agreeing with oil as the primary carbon source. Raman spectra reveal that residual heavy oils from all sites are immature and most likely originate from the same reservoir. Geochemical batch modelling using the software code PHREEQC demonstrates how sulphate‐driven oxidation of oil‐derived low‐molecular to high‐molecular weight hydrocarbons affects carbonate saturation state, and shows that the oxidation state of carbon in hydrocarbon compounds and oxidation rates of hydrocarbons control carbonate saturation and precipitation at oil seeps. Phase‐specific trace and rare earth element contents of microcrystalline aragonite and calcite, grey cryptocrystalline aragonite and clear aragonite were determined, revealing enrichment in light rare earth elements for grey aragonite. By comparing trace element patterns of carbonates with those of associated oils, it becomes apparent that liquid hydrocarbons constitute an additional source of trace metals to sedimentary pore waters. This work not only demonstrates that the microbial degradation of oil at seeps may result in the precipitation of carbonate minerals, it also elucidates that trace metal inventories of seep carbonates archive diagnostic elemental patterns, which can be assigned to the presence of heavy hydrocarbons in interstitial pore waters.

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“…These precipitates form loosely consolidated protoliths, hereafter referred to as "nodules," found below the sedimentwater interface within methane-perfused sediments (Orphan et al, 2004;Watanabe et al, 2008). Larger, fully lithified carbonate rocks also form, likely within methane-perfused sediment (Stadnitskaia et al, 2008;Bian et al, 2013), and can be exposed at the seabed following episodes of uplift and winnowing (Greinert et al, 2001;Naehr et al, 2007;Ussler and Paull, 2008). AOM activity associated with methane seepage at the seabed results in a heterogeneous landscape of reduced sediments and carbonate pavements, chemoherms, and large mounds, covered by patches of chemosynthetic communities.…”

Section: Introductionmentioning

confidence: 99%

Microbial abundance and diversity patterns associated with sediments and carbonates from the methane seep environments of Hydrate Ridge, OR

et al. 2014

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Methane seeps are among the most productive habitats along continental margins, as anaerobic methane-oxidizing euryarchaeaota and sulfur-metabolizing deltaproteobacteria form the biological base of a dynamic deep-sea ecosystem. The degree of methane seepage therefore represents one important variable in ecosystem dynamics, and the recent discovery of carbonate-hosted endolithic methanotrophy exposes another potentially discriminating factor: physical substrate type. Methanotrophic microbial communities have been detected within diverse seep-associated habitats, including unlithified sediments, protolithic carbonate nodules, and lithified carbonate slabs and chemoherms of distinct mineralogies. However, a systematic assessment of the diversity and community structure associated with these different habitats has been lacking. In this study, microbial aggregate analysis, microbial abundance quantification, mineralogical identification, and archaeal and bacterial 16S rRNA gene clone libraries were used to deconvolve the relationships between seepage activity, substrate type, and microbial community structure. We report prevalent methane-oxidizing archaeal lineages in both active and low-activity seep settings, and a strong community dependence on both seepage activity and substrate type. Statistical treatments of relative taxa abundances indicate that archaeal community structure is more dependent on the degree of methane seepage than physical substrate type; bacterial assemblages appear to be more strongly influenced by the type of colonization substrate than seepage activity. These findings provide a window into the determinants of community structure and function, improving our understanding of potential elemental cycling at seep sites.

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Tracing the evolution of seep fluids from authigenic carbonates: Green Canyon, northern Gulf of Mexico

Cited by 28 publications

References 91 publications

Deep-seated hydrocarbons in the seep “Brecciated Limestones” of the Maiella area (Adriatic foreland basin): Evaporitic sealing and oil re-mobilization effects linked to the drawdown of the Messinian Salinity Crisis

Deep-seated hydrocarbons in the seep “Brecciated Limestones” of the Maiella area (Adriatic foreland basin): Evaporitic sealing and oil re-mobilization effects linked to the drawdown of the Messinian Salinity Crisis

Oil seepage and carbonate formation: A case study from the southern Gulf of Mexico

Microbial abundance and diversity patterns associated with sediments and carbonates from the methane seep environments of Hydrate Ridge, OR

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