Sedimentary pyrite sulfur isotopes track the local dynamics of the Peruvian oxygen minimum zone DOI Creative Commons
Virgil Pasquier, David A. Fike, Itay Halevy

et al.

Nature Communications, Journal Year: 2021, Volume and Issue: 12(1)

Published: July 20, 2021

Abstract Sulfur cycling is ubiquitous in sedimentary environments, where it mediates organic carbon remineralization, impacting both local and global redox budgets, leaving an imprint pyrite sulfur isotope ratios (δ 34 S pyr ). It unclear to what extent stratigraphic δ variations reflect aspects of the depositional environment or microbial activity versus sulfur-cycle variations. Here, we couple carbon-nitrogen-sulfur concentrations stable isotopes identify clear influences on environmental changes along Peru margin. Stratigraphically coherent glacial-interglacial fluctuations (>30‰) were mediated by Oxygen Minimum Zone intensification/expansion enhancement matter deposition. The higher resulting sulfate reduction rates led more effective drawdown S-enrichment residual porewater sulfide produced from it, some which preserved pyrite. We loading as a major influence , adding growing body evidence highlighting controls these records.

Language: Английский

Pathways of methane removal in the sediment and water column of a seasonally anoxic eutrophic marine basin DOI Creative Commons
Olga M. Żygadłowska, Jessica Venetz, Robin Klomp

et al.

Frontiers in Marine Science, Journal Year: 2023, Volume and Issue: 10

Published: Jan. 26, 2023

Methane (CH 4 ) is a key greenhouse gas. Coastal areas account for major proportion of marine CH emissions. Eutrophication and associated bottom water hypoxia enhance production in coastal sediments. Here, we assess the fate produced sediments at site seasonally anoxic eutrophic basin (Scharendijke, Lake Grevelingen, Netherlands) spring (March) late summer (September) 2020. Removal sediment through anaerobic oxidation with sulfate (SO42-) known to be incomplete this system, as confirmed here by only slightly higher values δ 13 C-CH δD-CH porewater shallow sulfate-methane-transition zone (~5-15 cm depth) when compared deeper layers. In March 2020, column was fully oxygenated, that escaped from least partially removed aerobic oxidation. September below ~35 m depth, accumulated high concentrations (up 73 µmol L -1 waters oxycline. The sharp counter gradient oxygen depth increase above oxycline indicate mostly removal . Water profiles particulate dissolved Fe Mn suggest redox cycling both metals oxycline, pointing towards potential role metal oxides removal. id="im2">NH4+ id="im3">NO3- solutes near Analyses 16S rRNA gene sequences retrieved reveal presence oxidizing bacteria ( Methylomonadaceae methanotrophic archaea Methanoperedenaceae ), latter potentially capable id="im4">NO3- and/or metal-oxide dependent oxidation, Overall, our results combination pathways, which vary seasonally. Some appears escape surface atmosphere, however. We conclude eutrophication may make more important source atmosphere than commonly assumed.

Language: Английский

Citations

24
Microbial Sulfate Reduction and Its Role in Carbon Sequestration in Marine Sediments DOI
Xiting Liu, Houjie Wang, Jiarui Liu

et al.

Journal of Earth Science, Journal Year: 2024, Volume and Issue: 35(4), P. 1378 - 1381

Published: June 26, 2024

Language: Английский

Citations

8
Drivers of methane-cycling archaeal abundances, community structure, and catabolic pathways in continental margin sediments DOI Creative Commons
Longhui Deng,

Damian Bölsterli,

Clemens Glombitza

et al.

Frontiers in Microbiology, Journal Year: 2025, Volume and Issue: 16

Published: Feb. 6, 2025

Marine sediments contain Earth's largest reservoir of methane, with most this methane being produced and consumed in situ by methane-cycling archaea. While numerous studies have investigated communities archaea hydrocarbon seeps sulfate-methane transition zones, less is known about how these change from the seafloor downward throughout diffusion-dominated marine sediments. Focusing on four continental margin sites North Sea-Baltic Sea transition, we here investigate drivers archaeal community structure metabolism based geochemical stable carbon-isotopic gradients, functional gene (mcrA) copy numbers phylogenetic compositions, thermodynamic calculations. We observe major changes that largely follow vertical gradients sulfate concentrations lateral organic carbon reactivity content. bioturbated sulfatic zones are dominated methyl-disproportionating Methanosarcinaceae putatively CO2-reducing Methanomicrobiaceae, toward dominance methane-oxidizing taxa (ANME-2a-b, ANME-2c, ANME-1a-b) (SMTZs). By contrast, underlying methanogenesis physiologically uncharacterized ANME-1d, new genus-level groups methyl-reducing Methanomassiliicoccales. Notably, mcrA several increase 2 to 4 orders magnitude zone into SMTZ or methanic zone, providing evidence net population growth subsurface sediment. propose burial-related cause go through three successional stages (sulfatic, SMTZ, methanic). Herein, onset each stage characterized a period growth- mortality-driven turnover dominant taxa.

Language: Английский

Citations

1
Exchange catalysis during anaerobic methanotrophy revealed by 12CH2D2 and 13CH3D in methane DOI Creative Commons
Jeanine L. Ash, Matthias Egger, Tina Treude

et al.

Geochemical Perspectives Letters, Journal Year: 2019, Volume and Issue: unknown, P. 26 - 30

Published: April 1, 2019

The anaerobic oxidation of methane (AOM) is a crucial component the cycle, but quantifying its role in situ under dynamic environmental conditions remains challenging.We use sediment samples collected during IODP Expedition 347 to Baltic Sea show that relative abundances 12 CH 2 D and 13 3 remaining after microbial are internal, thermodynamic isotopic equilibrium, we attribute this phenomenon reversibility initial step AOM.These data suggest together can identify influence methanotrophy environments where conventional bulk isotope ratios ambiguous, these findings may lead new insights regarding global significance enzymatic back reaction cycle.

Language: Английский

Citations

60
Sedimentary pyrite sulfur isotopes track the local dynamics of the Peruvian oxygen minimum zone DOI Creative Commons
Virgil Pasquier, David A. Fike, Itay Halevy

et al.

Nature Communications, Journal Year: 2021, Volume and Issue: 12(1)

Published: July 20, 2021

Abstract Sulfur cycling is ubiquitous in sedimentary environments, where it mediates organic carbon remineralization, impacting both local and global redox budgets, leaving an imprint pyrite sulfur isotope ratios (δ 34 S pyr ). It unclear to what extent stratigraphic δ variations reflect aspects of the depositional environment or microbial activity versus sulfur-cycle variations. Here, we couple carbon-nitrogen-sulfur concentrations stable isotopes identify clear influences on environmental changes along Peru margin. Stratigraphically coherent glacial-interglacial fluctuations (>30‰) were mediated by Oxygen Minimum Zone intensification/expansion enhancement matter deposition. The higher resulting sulfate reduction rates led more effective drawdown S-enrichment residual porewater sulfide produced from it, some which preserved pyrite. We loading as a major influence , adding growing body evidence highlighting controls these records.

Language: Английский

Citations

54