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Mineralogical control on methylotrophic methanogenesis and implications for cryptic methane cycling in marine surface sediment

DOI: 10.1038/s41467-022-30422-4 DOI Help

Authors: Ke-Qing Xiao (University of Leeds) , Oliver W. Moore (University of Leeds) , Peyman Babakhani (University of Leeds) , Lisa Curti (University of Leeds) , Caroline L. Peacock (University of Leeds)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nature Communications , VOL 13

State: Published (Approved)
Published: May 2022
Diamond Proposal Number(s): 20839

Open Access Open Access

Abstract: Minerals are widely proposed to protect organic carbon from degradation and thus promote the persistence of organic carbon in soils and sediments, yet a direct link between mineral adsorption and retardation of microbial remineralisation is often presumed and a mechanistic understanding of the protective preservation hypothesis is lacking. We find that methylamines, the major substrates for cryptic methane production in marine surface sediment, are strongly adsorbed by marine sediment clays, and that this adsorption significantly reduces their concentrations in the dissolved pool (up to 40.2 ± 0.2%). Moreover, the presence of clay minerals slows methane production and reduces final methane produced (up to 24.9 ± 0.3%) by a typical methylotrophic methanogen—Methanococcoides methylutens TMA-10. Near edge X-ray absorption fine structure spectroscopy shows that reversible adsorption and occlusive protection of methylamines in clay interlayers are responsible for the slow-down and reduction in methane production. Here we show that mineral-OC interactions strongly control methylotrophic methanogenesis and potentially cryptic methane cycling in marine surface sediments.

Diamond Keywords: Carbon cycle

Subject Areas: Earth Science, Environment

Instruments: I08-Scanning X-ray Microscopy beamline (SXM)

Added On: 23/05/2022 09:22


Discipline Tags:

Earth Sciences & Environment Mineralogy Marine science/Oceanography Atmospheric Processes Geology

Technical Tags:

Microscopy Spectroscopy X-ray Microscopy Scanning X-ray Microscopy X-ray Absorption Spectroscopy (XAS) Near Edge X-ray Absorption Fine Structures (NEXAFS)