{"refrec":{"BRefID":331806,"RR":"<b>Sossi, P.A.; Burnham, A.D.; Badro, J.; Lanzirotti, A.; Newville, M.; O’Neill, H.S.C.</b> (2020). Redox state of Earth’s magma ocean and its Venus-like early atmosphere. <i>Science Advances 6(48)</i>: eabd1387. <a href=\"https://dx.doi.org/10.1126/sciadv.abd1387\" target=\"_blank\">https://dx.doi.org/10.1126/sciadv.abd1387</a>","BEntID":325418,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":0,"RefStringPartII":". <i>Science Advances 6(48)</i>: eabd1387. <a href=\"https://dx.doi.org/10.1126/sciadv.abd1387\" target=\"_blank\">https://dx.doi.org/10.1126/sciadv.abd1387</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Sossi, P.A.; Burnham, A.D.; Badro, J.; Lanzirotti, A.; Newville, M.; O’Neill, H.S.C.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Sossi, P.A. <i>et al.</i>","Englishabstract":"Exchange between a magma ocean and vapor produced Earth’s earliest atmosphere. Its speciation depends on the oxygen fugacity (<em>f</em>O<sub>2</sub>) set by the Fe<sup>3+</sup>/Fe<sup>2+</sup> ratio of the magma ocean at its surface. Here, we establish the relationship between <em>f</em>O<sub>2</sub> and Fe<sup>3+</sup>/Fe<sup>2+</sup> in quenched liquids of silicate Earth-like composition at 2173 K and 1 bar. Mantle-derived rocks have Fe<sup>3+</sup>/(Fe<sup>3+</sup>+Fe<sup>2+</sup>) = 0.037 ± 0.005, at which the magma ocean defines an <em>f</em>O<sub>2</sub> 0.5 log units above the iron-wüstite buffer. At this <em>f</em>O<sub>2</sub>, the solubilities of H-C-N-O species in the magma ocean produce a CO-rich atmosphere. Cooling and condensation of H<sub>2</sub>O would have led to a prebiotic terrestrial atmosphere composed of CO<sub>2</sub>-N<sub>2</sub>, in proportions and at pressures akin to those observed on Venus. Present-day differences between Earth’s atmosphere and those of her planetary neighbors result from Earth’s heliocentric location and mass, which allowed geologically long-lived oceans, in-turn facilitating CO<sub>2</sub> drawdown and, eventually, the development of life.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Redox state of Earth’s magma ocean and its Venus-like early atmosphere","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2020,"MonPub":null,"DateUpdate":"2020-12-08","DateCreate":"2020-12-08","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000595928400028","VABBcode":null,"OpenAcc":1,"DOI":"10.1126/sciadv.abd1387"},"refs":null,"anarec":{"AnaID":331806,"PubliDate":2020,"Pagination":"eabd1387","XtraPublOfAnaID":null,"ISBN":null,"Volume":"6","Issue":"48","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":248966,"SerRR":"Science Advances. 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