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Title: Towards quantifying the reaction network around the sulfate–methane-transition-zone in the Ulleung Basin, East Sea, with a kinetic modeling approach

Journal Article · · Geochimica et Cosmochimica Acta
 [1];  [1];  [2];  [2];  [2]
  1. Oregon State Univ., Corvallis, OR (United States). College of Earth, Ocean, and Atmospheric Sciences
  2. Korea Inst. of Geosciences and Mineral Resources Daejeon (Korea, Republic of). Petroleum and Marine Research Div.

We present a kinetic model based upon pore water data collected from eight sites drilled during the second Ulleung Basin gas hydrate drilling expedition (UBGH2) in 2010. Three sites were drilled at locations where acoustic chimneys were identified in seismic data, and the rest were drilled on non-chimney (i.e. background) environments. Our model, coupled a comprehensive compositional and isotopic data set, is used to illustrate the different biogeochemical processes at play in those two environments, in terms of reactions around the sulfate-methane-transition-zone (SMTZ). Organic matter decomposition is an important process for production of methane, dissolved inorganic carbon (DIC) and consumption of sulfate in the non-chimney sites, whereas anaerobic oxidation of methane (AOM) dominates both carbon and sulfur cycles in the chimney environment. Different sources of methane mediate AOM in the two settings. Internally produced methane through CO₂ reduction (CR) and methanogenesis fuels AOM in the non-chimney sites, whereas AOM is sustained by methane from external sources in the chimney sites. We also simulate the system evolution from non-chimney to chimney conditions by increasing the bottom methane supply to a non-chimney setting. We show that the higher CH₄ flux leads to a higher microbial activity of AOM, and more organic matter decomposition through methanogenesis. A higher methanogenesis rate and a smaller CR contribution relative to AOM in the chimney sites is responsible for the isotopically light DIC and heavy methane in this environment, relative to the non-chimney sites.

Research Organization:
Oregon State Univ., Corvallis, OR (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
FE0004000
OSTI ID:
1224085
Journal Information:
Geochimica et Cosmochimica Acta, Vol. 140, Issue C; ISSN 0016-7037
Publisher:
The Geochemical Society; The Meteoritical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 34 works
Citation information provided by
Web of Science

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Geophysical and geochemical controls on the megafaunal community of a high Arctic cold seep journal January 2018
Seepage from an arctic shallow marine gas hydrate reservoir is insensitive to momentary ocean warming journal June 2017
Carbon cycling fed by methane seepage at the shallow Cumberland Bay, South Georgia, sub-Antarctic: METHANE SEEPAGE IN CUMBERLAND BAY journal April 2016
Biogeochemistry and Water–Rock Interactions of Coalbed Methane Co-Produced Water in the Shizhuangnan Block of the Southern Qinshui Basin, China journal December 2019
Sources and turnover of organic carbon and methane in fjord and shelf sediments off northern Norway: SHELF VERSUS FJORD: CORG AND METHANE CYCLING journal October 2016
Microbial Community Structure Associated with Biogeochemical Processes in the Sulfate–Methane Transition Zone (SMTZ) of Gas-hydrate-bearing Sediment of the Ulleung Basin, East Sea journal August 2016
Origin and Transformation of Light Hydrocarbons Ascending at an Active Pockmark on Vestnesa Ridge, Arctic Ocean journal January 2020
Production of fluorescent dissolved organic matter in Arctic Ocean sediments journal December 2016
Microbial Geochemical Characteristics of the Coalbed Methane in the Shizhuangnan Block of Qinshui Basin, North China and their Geological Implications journal June 2019
Microbial Community Structure Associated with Biogeochemical Processes in the Sulfate–Methane Transition Zone (SMTZ) of Gas-hydrate-bearing Sediment of the Ulleung Basin, East Sea text January 2016
Microbial community structure associated with biogeochemical processes in the sulfate-methane transition zone (SMTZ) of gas hydrate-bearing sediment of the Ulleung Basin, East Sea text January 2016
Microbial Community Structure Associated with Biogeochemical Processes in the Sulfate–Methane Transition Zone (SMTZ) of Gas-hydrate-bearing Sediment of the Ulleung Basin, East Sea text January 2016
Biological early diagenesis and insolation-paced paleoproductivity signified in deep core sediment organic matter journal May 2017