Raman spectroscopy study of C-O-H-N speciation in reduced basaltic glasses: Implications for reduced planetary mantles

dc.contributor.authorDalou, Celia
dc.contributor.authorHirschmann, Marc
dc.contributor.authorJacobsen, Steven D.
dc.contributor.authorLe Losq, Charles
dc.date.accessioned2020-11-02T00:38:53Z
dc.date.issued2019
dc.date.updated2020-07-06T08:22:59Z
dc.description.abstractTo better understand the solution of volatile species in a reduced magma ocean, we identify via Raman spectroscopy the nature of C-O-H-N volatile species dissolved in a series of reduced basaltic glasses. The oxygen fugacity (f O2) during synthesis varied from highly reduced at two log units below the iron-wustite buffer (IW-2.1) to moderately reduced (IW-0.4), spanning much of the magmatic f O2 conditions during late stages of terrestrial accretion. Raman vibrational modes for H2, NH2 – , NH3, CH4, CO, CN– , N2, and OH– species are inferred from band assignments in all reduced glasses. The integrated area of Raman bands assigned to N2, CH4, NH3 and H2 vibrations in glasses increases with increasing molar volume of the melt, whereas that of CO decreases. Additionally, with increasing f O2, CO band areas increase while those of N2 decrease, suggesting that the solubility of these neutral molecules is not solely determined by the melt molar volume under reduced conditions. Coexisting with these neutral molecules, other species as CN– , NH2 – and OH– are chemically bonded within the silicate network. The observations indicate that, under reduced conditions, (1) H2, NH2 – , NH3, CH4, CO, CN– , N2, and OH– species coexist in silicate glasses representative of silicate liquids in a magma ocean (2) their relative abundances dissolved in a magma ocean depend on melt composition, f O2 and the availability of H and, (3) metal-silicate partitioning or degassing reactions of those magmatic volatile species must involve changes in melt and vapor speciation, which in turn may influence isotopic fractionation.en_AU
dc.description.sponsorshipCD and MH acknowledge support from the National Science Foundation grant AST1344133. SDJ acknowledges support from NSF EAR-1853521 and the David and Lucile Packard Foundation.en_AU
dc.format.mimetypeapplication/pdfen_AU
dc.identifier.issn0016-7037en_AU
dc.identifier.urihttp://hdl.handle.net/1885/213258
dc.language.isoen_AUen_AU
dc.publisherElsevieren_AU
dc.rights© 2019 Elsevier Ltden_AU
dc.sourceGeochimica et Cosmochimica Actaen_AU
dc.subjectMagma oceanen_AU
dc.subjectVolatilesen_AU
dc.subjectOxygen fugacityen_AU
dc.subjectNitrogenen_AU
dc.subjectCarbonen_AU
dc.subjectHydrogenen_AU
dc.subjectRaman spectroscopyen_AU
dc.titleRaman spectroscopy study of C-O-H-N speciation in reduced basaltic glasses: Implications for reduced planetary mantlesen_AU
dc.typeJournal articleen_AU
local.bibliographicCitation.lastpage47en_AU
local.bibliographicCitation.startpage32en_AU
local.contributor.affiliationDalou, Celia, University of Minnesotaen_AU
local.contributor.affiliationHirschmann, Marc, University of Minnesotaen_AU
local.contributor.affiliationJacobsen, Steven D., Northwestern Universityen_AU
local.contributor.affiliationLe Losq, Charles, College of Science, ANUen_AU
local.contributor.authoremailu1016575@anu.edu.auen_AU
local.contributor.authoruidLe Losq, Charles, u1016575en_AU
local.description.embargo2037-12-31
local.description.notesImported from ARIESen_AU
local.identifier.absfor040202 - Inorganic Geochemistryen_AU
local.identifier.absfor040299 - Geochemistry not elsewhere classifieden_AU
local.identifier.absseo970103 - Expanding Knowledge in the Chemical Sciencesen_AU
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciencesen_AU
local.identifier.ariespublicationu3102795xPUB5367en_AU
local.identifier.citationvolume265en_AU
local.identifier.doi10.1016/j.gca.2019.08.029en_AU
local.identifier.scopusID2-s2.0-85072016518
local.identifier.uidSubmittedByu3102795en_AU
local.publisher.urlhttps://www.elsevier.com/en-auen_AU
local.type.statusPublished Versionen_AU

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