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dc.contributor.authorShen, Ben_US
dc.contributor.authorDong, Len_US
dc.contributor.authorXiao, Sen_US
dc.contributor.authorLang, Xen_US
dc.contributor.authorHuang, Ken_US
dc.contributor.authorPeng, Yen_US
dc.contributor.authorZhou, Cen_US
dc.contributor.authorKe, Sen_US
dc.contributor.authorLiu, Pen_US
dc.coverage.spatialEnglanden_US
dc.date.accessioned2017-02-13T19:13:40Z
dc.date.available2017-02-13T19:13:40Z
dc.date.issued2016-01-07en_US
dc.identifier.urihttp://hdl.handle.net/10919/75017
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_US
dc.format.extent10317 - ? page(s)en_US
dc.languageengen_US
dc.relation.urihttp://www.ncbi.nlm.nih.gov/pubmed/26739600en_US
dc.subjectCarbonatesen_US
dc.subjectFossilsen_US
dc.subjectMagnesiumen_US
dc.subjectMethaneen_US
dc.subjectMolaren_US
dc.subjectOxidation-Reductionen_US
dc.subjectSulfatesen_US
dc.subjectSulfidesen_US
dc.subjectSulfur Isotopesen_US
dc.titleMolar tooth carbonates and benthic methane fluxes in Proterozoic oceans.en_US
dc.typeArticle - Refereed
dc.description.versionPublished online (Publication status)en_US
dc.title.serialNat Communen_US
dc.identifier.doihttps://doi.org/10.1038/ncomms10317
dc.type.otherResearch Support, Non-U.S. Gov'ten_US
dc.type.otherResearch Support, U.S. Gov't, Non-P.H.S.en_US
dc.identifier.volume7en_US
dc.identifier.eissn2041-1723en_US
pubs.organisational-group/Virginia Tech
pubs.organisational-group/Virginia Tech/All T&R Faculty
pubs.organisational-group/Virginia Tech/Science
pubs.organisational-group/Virginia Tech/Science/COS T&R Faculty
pubs.organisational-group/Virginia Tech/Science/Geosciences


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