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dc.contributor.authorRees Jones, D. W.
dc.contributor.authorRudge, John
dc.date.accessioned2021-05-17T23:51:01Z
dc.date.available2021-05-17T23:51:01Z
dc.date.issued2020-07-15
dc.identifier.citationRees Jones , D W & Rudge , J 2020 , ' Fast magma ascent, revised estimates from the deglaciation of Iceland ' , Earth and Planetary Science Letters , vol. 542 , 116324 . https://doi.org/10.1016/j.epsl.2020.116324en
dc.identifier.issn0012-821X
dc.identifier.otherPURE: 267818112
dc.identifier.otherPURE UUID: 6adb3e96-b1bb-4a89-8742-52862ba8b644
dc.identifier.otherORCID: /0000-0001-8698-401X/work/74510441
dc.identifier.otherWOS: 000537625600020
dc.identifier.otherScopus: 85084650614
dc.identifier.urihttp://hdl.handle.net/10023/23211
dc.descriptionAuthors thank the Leverhulme Trust for financial support.en
dc.description.abstractPartial melting of asthenospheric mantle generates magma that supplies volcanic systems. The timescale of melt extraction from the mantle has been hotly debated. Microstructural measurements of permeability typically suggest relatively slow melt extraction (1 m/yr) whereas geochemical (Uranium-decay series) and geophysical observations suggest much faster melt extraction (100 m/yr). The deglaciation of Iceland triggered additional mantle melting and magma flux at the surface. The rapid response has been used to argue for relatively rapid melt extraction. However, this episode must, at least to some extent, be unrepresentative, because the rates of magma eruption at the surface increased about thirty-fold relative to the steady state. Our goal is to quantify this unrepresentativeness. We develop a one-dimensional, time-dependent and nonlinear (far from steady-state), model forced by the most recent, and best mapped, Icelandic deglaciation. We find that 30 m/yr is the best estimate of the steady-state maximum melt velocity. This is a factor of about 3 smaller than previously claimed, but still relatively fast. We translate these estimates to other mid-ocean ridges accounting for differences in passive and active upwelling and degree of melting. We find that fast melt extraction greater than about 10 m/yr prevails globally.
dc.format.extent9
dc.language.isoeng
dc.relation.ispartofEarth and Planetary Science Lettersen
dc.rightsCopyright © 2020 Elsevier B.V. All rights reserved. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1016/j.epsl.2020.116324en
dc.subjectMagma migrationen
dc.subjectMagma velocityen
dc.subjectMid-ocean ridgesen
dc.subjectIcelanden
dc.subjectDeglaciationen
dc.subjectGE Environmental Sciencesen
dc.subjectQA Mathematicsen
dc.subjectDASen
dc.subjectBDCen
dc.subject.lccGEen
dc.subject.lccQAen
dc.titleFast magma ascent, revised estimates from the deglaciation of Icelanden
dc.typeJournal articleen
dc.description.versionPostprinten
dc.contributor.institutionUniversity of St Andrews.Applied Mathematicsen
dc.identifier.doihttps://doi.org/10.1016/j.epsl.2020.116324
dc.description.statusPeer revieweden
dc.identifier.urlhttps://arxiv.org/abs/1910.08318en


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