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dc.contributor.authorJenkins, Jennifer
dc.contributor.authorMaclennan, John
dc.contributor.authorGreen, Robert
dc.contributor.authorCottaar, Sanne
dc.contributor.authorDeuss, AF
dc.contributor.authorWhite, Robert
dc.date.accessioned2018-09-08T06:29:31Z
dc.date.available2018-09-08T06:29:31Z
dc.date.issued2018-06
dc.identifier.issn2169-9313
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/279760
dc.description.abstractIceland sits astride a mid-ocean ridge underlain by a {mantle} hotspot. The interplay of these two geological processes has the potential to generate a complex and laterally variable crustal structure. The thickness of the Icelandic crust is a long running and controversial debate, with estimates ranging from a "thin'' 20 km crust to a "thick'' 40 km crust. We present new images of the first order seismic discontinuity structure of the Icelandic crust based on a joint inversion of receiver function and ambient noise derived surface wave dispersion data. Inversion results are validated through comparison to receiver functions multi-phase common conversion point stacks across the densely instrumented Northern Volcanic Zone. We find a multi-layered crustal structure consisting of a 6-10 km deep upper crust underlain by either one or two discontinuities. The shallower discontinuity is found at depths of ~20 km throughout Iceland. The deeper discontinuity is only present in some regions, defining the base of a lens-like lower layer with maximum depths of 44 km above the center of the mantle plume. Either of these two discontinuities could be interpreted as the seismic Moho, providing an explanation why previous estimates of crustal thickness have diverged. Such structure may form via underplating of a pre-existing oceanic crust as has been hypothesized in other ocean island plume settings. However we demonstrate with a simple petrological model that variability in seismic discontinuity structure can also be understood as a consequence of compositional variation in melts generated with distance from the plume center.
dc.publisherAmerican Geophysical Union (AGU)
dc.titleCrustal Formation on a Spreading Ridge Above a Mantle Plume: Receiver Function Imaging of the Icelandic Crust
dc.typeArticle
prism.endingPage5208
prism.issueIdentifier6
prism.publicationDate2018
prism.publicationNameJournal of Geophysical Research: Solid Earth
prism.startingPage5190
prism.volume123
dc.identifier.doi10.17863/CAM.27130
dcterms.dateAccepted2018-06-04
rioxxterms.versionofrecord10.1029/2017JB015121
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2018-06-01
dc.contributor.orcidJenkins, Jennifer [0000-0001-8531-8656]
dc.contributor.orcidMaclennan, John [0000-0001-6857-9600]
dc.contributor.orcidGreen, Robert [0000-0002-1614-7133]
dc.contributor.orcidCottaar, Sanne [0000-0003-0493-6570]
dc.contributor.orcidWhite, Robert [0000-0002-2972-397X]
dc.identifier.eissn2169-9356
rioxxterms.typeJournal Article/Review
pubs.funder-project-idEuropean Commission (308377)
pubs.funder-project-idNatural Environment Research Council (NE/H025006/1)
cam.issuedOnline2018-06-29
rioxxterms.freetoread.startdate2018-12-05


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