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

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  • 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.
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  • Hong, W. L., Torres, M. E., Kim, J. H., Choi, J., & Bahk, J. J. (2014). Towards quantifying the reaction network around the sulfate-methane-transition-zone in the Ulleung Basin, East Sea, with a kinetic modeling approach. Geochimica et Cosmochimica Acta, 140, 127-141. doi:10.1016/j.gca.2014.05.032
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  • 140
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  • This project was made possible with the funding support from U.S. Department of Energy, contract numbers: DE-FE0004000 and DOE Award No.: DE-FE0010496. In addition we acknowledge support from Korea Institute of Geosciences and Mineral Resources (KIGAM) (GP2012-026) and the Hanse-Wissenschaftskolleg, Institute for Advanced Study in Delmenhorst, Germany through a fellowship to M.T.
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  • description.provenance : Approved for entry into archive by Deanne Bruner(deanne.bruner@oregonstate.edu) on 2015-01-29T19:56:24Z (GMT) No. of bitstreams: 3 HongWeiLiCEOASTowardsQuantifyingTheReaction.pdf: 849423 bytes, checksum: 0642ab0e29f70c3a1d491d99451b789a (MD5) HongWeiLiCEOASTowardsQuantifyingTheReaction(Appendix2).pdf: 47506 bytes, checksum: 7f5eef1e86bb92b599988e24b548d5f9 (MD5) HongWeiLiCEOASTowardsQuantifyingTheReaction(Appendix3).pdf: 51533 bytes, checksum: ca4992ed3ffff7d94abfae6a761ef94d (MD5)
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