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Impact of High Methane Flux on the Properties of Pore Fluid and Methane-Derived Authigenic Carbonate in the ARAON Mounds, Chukchi Sea

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dc.contributor.authorKim, Ji-Hoon-
dc.contributor.authorPark, Myong-Ho-
dc.contributor.authorLee, Dong-Hun-
dc.contributor.authorMinami, Hirotsugu-
dc.contributor.authorJin, Young-Keun-
dc.contributor.authorHachikubo, Akihiro-
dc.contributor.authorHur, Jin-
dc.contributor.authorRyu, Jong-Sik-
dc.contributor.authorKang, Moo-Hee-
dc.contributor.authorJang, Kwangchul-
dc.contributor.authorKida, Masato-
dc.contributor.authorSeo, Yongwon-
dc.contributor.authorChen, Meilian-
dc.contributor.authorHong, Jong Kuk-
dc.contributor.authorSong, Yungoo-
dc.contributor.authorPark, Sanghee-
dc.description.abstractWe investigated the pore fluid and methane-derived authigenic carbonate (MDAC) chemistry from the ARAON Mounds in the Chukchi Sea to reveal how methane (CH4) seepage impacts their compositional and isotopic properties. During the ARA07C and ARA09C Expeditions, many in situ gas hydrates (GHs) and MDACs were found near the seafloor. The fluid chemistry has been considerably modified in association with the high CH4 flux and its related byproducts (GHs and MDACs). Compared to Site ARA09C-St 08 (reference site), which displays a linear SO4 2- downcore profile, the other sites (e.g., ARA07C-St 13, ARA07C-St 14, ARA09C-St 04, ARA09C-St 07, and ARA09C-St 12) that are found byproducts exhibit concave-up and/or kink type SO4 2- profiles. The physical properties and fluid pathways in sediment columns have been altered by these byproducts, which prevents the steady state condition of the dissolved species through them. Consequently, chemical zones are separated between bearing and nonbearing byproducts intervals under non-steady state condition from the seafloor to the sulfate-methane transition (SMT). GH dissociation also significantly impacts pore fluid properties (e.g., low Cl- , enriched δD and δ18O). The upward CH4 with depleted δ13C from the thermogenic origin affects the chemical signatures of MDACs. The enriched δ18O fluid from GH dissociation also influences the properties of MDACs. Thus, in the ARAON Mounds, the chemistry of the fluid and MDAC has significantly changed, most likely responding to the CH4 flux and GH dissociation through geological time. Overall, our findings will improve the understanding and prediction of the pore fluid and MDAC chemistry in the Arctic Ocean related to CH4 seepage by global climate change.en_US
dc.subjectEnvironmental Sciences & Ecologyen_US
dc.subjectMarine & Freshwater Biologyen_US
dc.titleImpact of High Methane Flux on the Properties of Pore Fluid and Methane-Derived Authigenic Carbonate in the ARAON Mounds, Chukchi Seaen_US
dc.title.alternative메탄 플럭스가 척치해 아라온 마운드 공극수와 자생성 탄산염 특성에 미친 영향en_US
dc.identifier.bibliographicCitationKim, Ji-Hoon, et al. 2022. "Impact of High Methane Flux on the Properties of Pore Fluid and Methane-Derived Authigenic Carbonate in the ARAON Mounds, Chukchi Sea". <em>FRONTIERS IN MARINE SCIENCE</em>, 9: 1-15.-
dc.description.jcrRateJCR 2020:5.455en_US
dc.subject.keywordpore fluiden_US
dc.subject.keywordmethane fluxen_US
dc.subject.keywordgas hydrateen_US
dc.subject.keywordARAON Moundsen_US
Appears in Collections  
2021-2021, Survey of Geology and Seabed Environmental Change in the Arctic Seas (21-21) / Hong, Jong Kuk (PM21050)
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