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dc.date.accessioned2018-03-06T12:17:46Z
dc.date.available2018-03-06T12:17:46Z
dc.date.created2018-01-03T12:20:33Z
dc.date.issued2017
dc.identifier.citationBreivik, Asbjørn Johan Faleide, Jan Inge Mjelde, Rolf Flueh, Ernst R. Murai, Yoshio . A new tectono-magmatic model for the Lofoten/Vesterålen Margin at the outer limit of the Iceland Plume influence. Tectonophysics. 2017, 718, 25-44
dc.identifier.urihttp://hdl.handle.net/10852/60730
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.languageEN
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleA new tectono-magmatic model for the Lofoten/Vesterålen Margin at the outer limit of the Iceland Plume influenceen_US
dc.typeJournal articleen_US
dc.creator.authorBreivik, Asbjørn Johan
dc.creator.authorFaleide, Jan Inge
dc.creator.authorMjelde, Rolf
dc.creator.authorFlueh, Ernst R.
dc.creator.authorMurai, Yoshio
dc.date.embargoenddate2019-07-05
cristin.unitcode185,15,22,0
cristin.unitnameInstitutt for geofag
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode1
dc.identifier.cristin1534696
dc.identifier.bibliographiccitationinfo:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Tectonophysics&rft.volume=718&rft.spage=25&rft.date=2017
dc.identifier.jtitleTectonophysics
dc.identifier.volume718
dc.identifier.startpage25
dc.identifier.endpage44
dc.identifier.doihttp://dx.doi.org/10.1016/j.tecto.2017.07.002
dc.identifier.urnURN:NBN:no-63369
dc.type.documentTidsskriftartikkelen_US
dc.type.peerreviewedPeer reviewed
dc.source.issn0040-1951
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/60730/1/Breivik_Lofoten-tectonic-model_Postprint-Tectonophysics_2017.pdf
dc.type.versionAcceptedVersion
dc.relation.projectNFR/168605


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