Sulfate reduction is a ubiquitous microbial process and an important pathway for organic matter oxidation in marine sedi-ments;the latter process is referred to as organoclastic sulfate reduction (OSR) [1,2].Yet,microbial sulfate reduction also serves as a methane barrier in marine sediments,preventing the ingress of more than 90％ of the seeping methane,a powerful greenhouse gas,into the ocean through sulfate-driven anaerobic oxidation of methane (AOM) [3,4].Despite of AOM representing an efficient methane sink,large methane release events have been suggested as triggers of extreme climate change in the geological past [5].Sulfate reduction,either in the form of OSR or AOM,produces dis-solved bicarbonate,typically increasing pore-water alkalinity and inducing the formation of authigenic carbonates [6].Authigenic carbonate resulting from sulfate reduction in marine sediments is believed to have played a key role in the carbon cycle in ancient oceans and still does so today [7,8].Therefore,it is crucial to under-stand the global distribution and magnitude of sulfate reduction and its role in oceanic carbon and sulfur cycling.

Yu Hu;Xinxin Zhang;Dong Feng;J(o)rn Peckmann;Junxi Feng;Hongbin Wang;Shengxiong Yang;Duofu Chen

Shanghai Engineering Research Center of Hadal Science and Technology,College of Marine Sciences,Shanghai Ocean University,Shanghai 201306,China;Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266061,China;Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou),Guangzhou 511458,China;Institute for Geology,Center for Earth System Research and Sustainability,Universit(a)t Hamburg,Hamburg 20146,Germany;Key Laboratory of Marine Mineral Resources,Guangzhou Marine Geological Survey,Guangzhou 510075,China

科学通报（英文版）

[1]Yu Hu;Xinxin Zhang;Dong Feng;J(o)rn Peckmann;Junxi Feng;Hongbin Wang;Shengxiong Yang;Duofu Chen-.Enhanced sulfate consumption fueled by deep-sourced methane in a hydrate-bearing area)[J].科学通报（英文版）,2022(02):122-124

organoclastic,seeping

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