DOI: 10.1016/j.epsl.2019.115994
论文题名: Multiple sulfur isotopes in methane seep carbonates track unsteady sulfur cycling during anaerobic methane oxidation
作者: Crémière A. ; Pellerin A. ; Wing B.A. ; Lepland A.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 532 语种: 英语
中文关键词: anaerobic oxidation of methane
; methane-derived authigenic carbonates
; microbial sulfate reduction
; multiple sulfur isotopes
; pyrite and carbonate-associated sulfate
英文关键词: Carbonates
; Carbonation
; Isotopes
; Oxidation
; Pyrites
; Submarine geology
; Sulfate minerals
; Anaerobic oxidation of methanes
; Carbonate-associated sulfates
; Methane-derived authigenic carbonates
; Multiple sulfur isotopes
; Sulfate reduction
; Methane
; carbonate sediment
; hydrocarbon seep
; methane
; oxidation
; precipitation (chemistry)
; pyrite
; sulfate
; sulfur cycle
; sulfur isotope
; Arctic Ocean
; Atlantic Ocean
; Barents Sea
; North Sea
英文摘要: The anaerobic oxidation of methane coupled with sulfate reduction (AOM-SR) is a major microbially-mediated methane consuming process in marine sediments including methane seeps. The AOM-SR can lead to the formation of methane-derived authigenic carbonates which entrap sulfide minerals (pyrite) and carbonate-associated sulfate (CAS). We studied the sulfur isotope compositions of the pyrite and CAS in seafloor methane-derived authigenic carbonate crust samples from the North Sea and Barents Sea which reflect the time-integrated metabolic activity of the AOM-SR community as well as the physical conditions under which those carbonates are formed. In these samples, pyrite exhibits δ34S values ranging from −23.4‰ to 14.8‰ and Δ33S values between −0.06‰ and 0.16‰, whereas CAS is characterized by δ34S values ranging from 26.2‰ to 61.6‰ and Δ33S mostly between −0.05‰ and 0.07‰. Such CAS sulfur isotope compositions are distinctly lower in δ34S-Δ33S space from published porewater sulfate values from environments where the reduction of sulfate is mostly coupled to sedimentary organic matter oxidation. Mass-balance modelling suggests that (1) AOM-SR appears to cause rapid carbonate precipitation under high methane flux near or at the sediment-water interface and (2) that the precipitation of pyrite and carbonates are not necessarily synchronous. The sulfur isotopic composition of pyrite is interpreted to reflect more variable precipitating conditions of evolving sulfide with porewater connectivity, fluctuating methane fluxes and oxidative sulfur cycle. Taken together, the multiple isotopic compositions of pyrite and sulfate in methane-derived authigenic carbonates indicate protracted precipitation under conditions of non-steady state methane seepage activity. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164931
Appears in Collections: 气候变化与战略
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作者单位: Geological Survey of Norway, Trondheim, 7491, Norway; Centre for Arctic Gas Hydrate, Environment and Climate, University of Tromsø, Tromsø, 9037, Norway; Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States; Center for Geomicrobiology, Department of Biological Sciences, Aarhus University, Ny Munkegade 114, Aarhus C, 8000, Denmark; Geological Sciences, University of Colorado Boulder, UCB 399, Boulder, CO 80309-0399, United States; Department of Geology, University of Tartu, Tartu, 50411, Estonia
Recommended Citation:
Crémière A.,Pellerin A.,Wing B.A.,et al. Multiple sulfur isotopes in methane seep carbonates track unsteady sulfur cycling during anaerobic methane oxidation[J]. Earth and Planetary Science Letters,2020-01-01,532