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Insights Into the Nature of Plume-Ridge Interaction and Outflux of H2O From the Galápagos Spreading Center

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cam.issuedOnline2021-11-12
dc.contributor.authorGleeson, MLM
dc.contributor.authorGibson, SA
dc.contributor.orcidGleeson, MLM [0000-0003-0839-5492]
dc.contributor.orcidGibson, SA [0000-0002-4835-2908]
dc.date.accessioned2021-11-22T14:34:00Z
dc.date.available2021-11-22T14:34:00Z
dc.date.issued2021
dc.date.submitted2020-11-20
dc.date.updated2021-11-22T14:33:59Z
dc.descriptionFunder: Royal Commission for the Exhibition of 1851; Id: http://dx.doi.org/10.13039/501100000700
dc.description.abstract<jats:title>Abstract</jats:title><jats:p>The flow of high‐temperature and compositionally enriched material between mantle plumes and nearby spreading centers influences up to 30% of the global mid‐ocean ridge system and represents a significant, but currently unconstrained, flux of volatiles out of the mantle. Here, we present new analyses of H<jats:sub>2</jats:sub>O, F, Cl, and S in basaltic glass chips from an archetypal region of plume‐ridge interaction, the Galápagos Spreading Center (GSC). Our data set includes samples from the eastern GSC, on ridge segments that are strongly influenced by the adjacent Galápagos mantle plume, and complements published analyses of volatiles largely from the western GSC. We use forward models of mantle melting to investigate the role of solid and melt‐phase transport from a lithologically heterogeneous (peridotite‐pyroxenite) mantle in plume‐ridge interaction along approximately 1,000 km of the GSC. Our results indicate that the observed geochemical and geophysical variations cannot be recreated by models that only involve solid‐state transfer of material between the Galápagos mantle plume and the GSC. Instead, we show that the geochemical and geophysical data from the GSC are well‐matched by models that incorporate channelized flow of volatile‐rich melts formed at high‐pressures (&gt;3 GPa) in the Galápagos plume stem to the GSC. In addition, our new models demonstrate that channelized flow of enriched, plume‐derived melt can account for up to ∼60% of the H<jats:sub>2</jats:sub>O outgassed from regions of the GSC, which are most strongly influenced by the Galápagos mantle plume.</jats:p>
dc.identifier.citationGeochemistry, Geophysics, Geosystems, volume 22, issue 11, page e2020GC009560
dc.identifier.doi10.17863/CAM.78214
dc.identifier.eissn1525-2027
dc.identifier.issn1525-2027
dc.identifier.otherggge22674
dc.identifier.other2020gc009560
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/330771
dc.languageen
dc.language.isoeng
dc.publisherAmerican Geophysical Union (AGU)
dc.publisher.urlhttp://dx.doi.org/10.1029/2020gc009560
dc.subjectGalapagos
dc.subjectplume-ridge interaction
dc.subjectchannelized flow
dc.subjectmantle dynamics
dc.subjectvolatiles
dc.subjectvolatile flux
dc.titleInsights Into the Nature of Plume-Ridge Interaction and Outflux of H<inf>2</inf>O From the Galápagos Spreading Center
dc.typeArticle
dcterms.dateAccepted2021-10-18
prism.publicationNameGeochemistry, Geophysics, Geosystems
pubs.funder-project-idNatural Environment Research Council (NERC) (NE/L002507/1, RG57434, IMF622/0517)
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0/
rioxxterms.versionVoR
rioxxterms.versionofrecord10.1029/2020GC009560

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