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dc.contributor.authorBreivik, Asbjørn Johan
dc.contributor.authorFaleide, Jan Inge
dc.contributor.authorMjelde, Rolf
dc.contributor.authorFlueh, Ernst R.
dc.contributor.authorMurai, Yoshio
dc.date.accessioned2018-04-27T12:40:12Z
dc.date.available2018-04-27T12:40:12Z
dc.date.issued2017-10
dc.PublishedBreivik AJ, Faleide JI, Mjelde R, Flueh ER, Murai Y. A new tectono-magmatic model for the Lofoten/Vesterålen Margin at the outer limit of the Iceland Plume influence. Tectonophysics. 2017;718:25-44eng
dc.identifier.issn0040-1951en_US
dc.identifier.issn1879-3266en_US
dc.identifier.urihttps://hdl.handle.net/1956/17672
dc.description.abstractThe Early Eocene continental breakup was magma-rich and formed part of the North Atlantic Igneous Province. Extrusive and intrusive magmatism was abundant on the continental side, and a thick oceanic crust was produced up to a few m.y. after breakup. However, the extensive magmatism at the Vøring Plateau off mid-Norway died down rapidly northeastwards towards the Lofoten/Vesterålen Margin. In 2003 an Ocean Bottom Seismometer profile was collected from mainland Norway, across Lofoten, and into the deep ocean. Forward/inverse velocity modeling by raytracing reveals a continental margin transitional between magma-rich and magma-poor rifting. For the first time a distinct lower-crustal body typical for volcanic margins has been identified at this outer margin segment, up to 3.5 km thick and ∼50 km wide. On the other hand, expected extrusive magmatism could not be clearly identified here. Strong reflections earlier interpreted as the top of extensive lavas may at least partly represent high-velocity sediments derived from the shelf, and/or fault surfaces. Early post-breakup oceanic crust is moderately thickened (∼8 km), but is reduced to 6 km after 1 m.y. The adjacent continental crystalline crust is extended down to a minimum of 4.5 km thickness. Early plate spreading rates derived from the Norway Basin and the northern Vøring Plateau were used to calculate synthetic magnetic seafloor anomalies, and compared to our ship magnetic profile. It appears that continental breakup took place at ∼53.1 Ma, ∼1 m.y. later than on the Vøring Plateau, consistent with late strong crustal extension. The low interaction between extension and magmatism indicates that mantle plume material was not present at the Lofoten Margin during initial rifting, and that the observed excess magmatism was created by late lateral transport from a nearby pool of plume material into the lithospheric rift zone at breakup time.en_US
dc.language.isoengeng
dc.publisherElsevieren_US
dc.rightsAttribution CC BY-NC-NDeng
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/eng
dc.subjectOcean bottom seismometerseng
dc.subjectLarge igneous provinceseng
dc.subjectMarine magneticseng
dc.subjectContinental breakupeng
dc.titleA new tectono-magmatic model for the Lofoten/Vesterålen Margin at the outer limit of the Iceland Plume influenceen_US
dc.typePeer reviewed
dc.typeJournal article
dc.date.updated2018-01-11T08:45:30Z
dc.description.versionacceptedVersionen_US
dc.rights.holderCopyright 2017 Elsevier B.V. All rights reserved.en_US
dc.identifier.doihttps://doi.org/10.1016/j.tecto.2017.07.002
dc.identifier.cristin1534696
dc.source.journalTectonophysics
dc.source.pagenumber25-44
dc.relation.projectNorges forskningsråd: 168605
dc.identifier.citationTectonophysics. 2017;718:25-44
dc.source.volume718


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