Molar tooth carbonates and benthic methane fluxes in Proterozoic oceans

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dc.contributor.authorShen, B.en
dc.contributor.authorDong, L.en
dc.contributor.authorXiao, S.en
dc.contributor.authorLang, X.en
dc.contributor.authorHuang, K.en
dc.contributor.authorPeng, Y.en
dc.contributor.authorZhou, C.en
dc.contributor.authorKe, S.en
dc.contributor.authorLiu, P.en
dc.contributor.departmentGeosciencesen
dc.coverage.spatialEnglanden
dc.date.accessioned2017-02-13T19:13:40Zen
dc.date.available2017-02-13T19:13:40Zen
dc.date.issued2016-01-07en
dc.description.abstractMolar tooth structures are ptygmatically folded and microspar-filled structures common in early- and mid-Proterozoic (∼2,500-750 million years ago, Ma) subtidal successions, but extremely rare in rocks <750 Ma. Here, on the basis of Mg and S isotopes, we show that molar tooth structures may have formed within sediments where microbial sulphate reduction and methanogenesis converged. The convergence was driven by the abundant production of methyl sulphides (dimethyl sulphide and methanethiol) in euxinic or H2S-rich seawaters that were widespread in Proterozoic continental margins. In this convergence zone, methyl sulphides served as a non-competitive substrate supporting methane generation and methanethiol inhibited anaerobic oxidation of methane, resulting in the buildup of CH4, formation of degassing cracks in sediments and an increase in the benthic methane flux from sediments. Precipitation of crack-filling microspar was driven by methanogenesis-related alkalinity accumulation. Deep ocean ventilation and oxygenation around 750 Ma brought molar tooth structures to an end.en
dc.description.versionPublished versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1038/ncomms10317en
dc.identifier.eissn2041-1723en
dc.identifier.urihttp://hdl.handle.net/10919/75017en
dc.identifier.volume7en
dc.language.isoenen
dc.relation.urihttp://www.ncbi.nlm.nih.gov/pubmed/26739600en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectCarbonatesen
dc.subjectFossilsen
dc.subjectMagnesiumen
dc.subjectMethaneen
dc.subjectMolaren
dc.subjectOxidation-Reductionen
dc.subjectSulfatesen
dc.subjectSulfidesen
dc.subjectSulfur Isotopesen
dc.titleMolar tooth carbonates and benthic methane fluxes in Proterozoic oceansen
dc.title.serialNature Communicationsen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.otherResearch Support, Non-U.S. Gov'ten
dc.type.otherResearch Support, U.S. Gov't, Non-P.H.S.en
pubs.organisational-group/Virginia Techen
pubs.organisational-group/Virginia Tech/All T&R Facultyen
pubs.organisational-group/Virginia Tech/Scienceen
pubs.organisational-group/Virginia Tech/Science/COS T&R Facultyen
pubs.organisational-group/Virginia Tech/Science/Geosciencesen

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