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The influence of coupling mode of methane leakage and debris input on anaerobic oxidation of methane

Acta Oceanologica Sinica 2021年第8期40卷 78-88页

作者： Rui Xie Daidai Wu Jie Liu Guangrong Jin Tiantian Sun Lihua Liu Nengyou Wu Key Laboratory of Gas Hydrate Guangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhou 510640China Guangzhou Marine Geological Survey China Geological SurveyMinistry of Natural ResourcesGuangzhou 510075China Institution of South China Sea Ecology and Environmental Engineering Chinese Academy of SciencesGuangzhou 510301China Evaluation and Detection Technology Laboratory of Marine Mineral Resources Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Key laboratory of Gas Hydrate Ministry of Natural ResourcesQingdao 266071China

Anaerobic oxidation of methane(AOM) is an important biogeochemical process, which has important scientific significance for global climate change and atmospheric evolution. This research examined the δ^(34)S, terrigenous clastic indices of TiO_(2) and Al_(2)O_(3), and times for formation of the Ba front at site SH1, site SH3 and site 973-4 in the South China Sea. Three different coupling mechanisms of deposition rate and methane flux were discovered. The different coupling mechanisms had different effects on the role of AOM. At site 973-4, a high deposition rate caused a rapid vertical downward migration of the sulphate–methane transition zone(SMTZ), and the higher input resulted in mineral dissolution. At site SH3, the deposition rate and methane flux were basically in balance,so the SMTZ and paleo-SMTZ were the most stable of any site, and these were in a slow process of migration. At site SH1, the methane flux dominated the coupled mode, so the movement of the SMTZ at site SH1 was consistent with the general understanding. Understanding the factors influencing the SMTZ is important for understanding the early diagenesis process.

关键词： methane seep terrestrial detrital material anaerobic oxidation of methane gas hydrate

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