Widespread phosphorous excess in olivine, rapid crystal growth, and implications for magma dynamics

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dc.citation.firstpage433
dc.citation.issueNumber2
dc.citation.journalTitleVolcanica
dc.citation.lastpage450
dc.citation.volumeNumber5
dc.contributor.authorLee, Cin-Ty
dc.contributor.authorSun, Chenguang
dc.contributor.authorSharton-Bierig, Eytan
dc.contributor.authorPhelps, Patrick
dc.contributor.authorBorchardt, Jackson
dc.contributor.authorLiu, Boda
dc.contributor.authorCostin, Gelu
dc.contributor.authorJohnston, A. Dana
dc.date.accessioned2023-03-23T14:10:33Z
dc.date.available2023-03-23T14:10:33Z
dc.date.issued2022
dc.description.abstractTrace element zoning is often used to unravel the crystallization history of phenocrysts in magmatic systems, but interpretation requires quantifying the relative importance of equilibrium versus disequilibrium. Published partition coefficients for phosphorous (P) in olivine vary by more than a factor of ten. After considering kinetic effects, a new equilibrium partition coefficient was extrapolated from a re-examination of natural and experimental systems, indicating that P partition coefficients in olivine are significantly over-estimated. These new partitioning constraints allow us to establish a theoretical P Equilibrium Fractionation Array (PEFA) for mid-ocean ridge basalts (MORBs), revealing that most olivines from MORBs have excess P (2–15 times PEFA) and are thus in disequilibrium. Using an independent case study of natural dendritic olivines, we show that such P enrichments can be explained by diffusion-limited incorporation of P during rapid crystal growth. If growth rate can be related to cooling, the rapid growth rates of olivines have implications for magma system dynamics, such as the size of magma bodies or where crystallization occurs within the body.
dc.identifier.citationLee, Cin-Ty, Sun, Chenguang, Sharton-Bierig, Eytan, et al.. "Widespread phosphorous excess in olivine, rapid crystal growth, and implications for magma dynamics." <i>Volcanica,</i> 5, no. 2 (2022) Presses universitaires de Strasbourg: 433-450. https://doi.org/10.30909/vol.05.02.433450.
dc.identifier.digitalLee-et-al_2022_Volcanica
dc.identifier.doihttps://doi.org/10.30909/vol.05.02.433450
dc.identifier.urihttps://hdl.handle.net/1911/114524
dc.language.isoeng
dc.publisherPresses universitaires de Strasbourg
dc.rightsThis work is licensed under a Creative Commons Attribution 4.0 International License.
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titleWidespread phosphorous excess in olivine, rapid crystal growth, and implications for magma dynamics
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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