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An 40Ar/39Ar thermochronology of the Ofoten-Troms region: Implications for terrane amalgamation and extensional collapse of the northern Scandinavian Caledonides


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dc.creatorCoker, Janet
dc.creatorSteltenpohl, Mark
dc.creatorAndresen, Arild
dc.creatorKunk, Michael
dc.date.accessioned2022-10-25T20:06:45Z
dc.date.available2022-10-25T20:06:45Z
dc.date.created1995
dc.identifier10.1029/94TC03091en_US
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/94TC03091en_US
dc.identifier.urihttps://aurora.auburn.edu/handle/11200/50422
dc.identifier.urihttp://dx.doi.org/10.35099/aurora-490
dc.description.abstractFifteen Ar-40/Ar-39 cooling ages are reported for metamorphic hornblende and muscovite from far traveled terranes constituting the Ofoten nappe stack of northern Norway. Eight cooling ages on hornblende range from 425 to 394 Ma and seven muscovite ages, from the same or nearby outcrops as the hornblendes, range from 400 to 373 Ma. These data are compared with Ar-40/Ar-39 ages from over a large part of the northern Caledonides to evaluate regional mineral cooling patterns. Results indicate that (1) Scandian (Silurian-Devonian) metamorphism was predominant; (2) most of the nappes investigated contain some vestige of pre-Scandian tectonism and/or metamorphism; (3) hornblende and muscovite cooling ages are progressively younger to the west and south, which suggests a hinged-to-the-east mineral cooling pattern; and (4) a late, out-of-sequence thrust is the only disruption of this cooling pattern. Synmetamorphic amalgamation of the nappes resulted from Scandian A type subduction. The hinged-to-the-east mineral cooling pattern implies isostatic adjustment and exhumation of the footwall of a west clipping, crustal-scale extensional fault, located somewhere west of the present Norwegian coast, during late synorogenic gravitational collapse. The late out-of-sequence fault formed contemporaneously with uplift in the hinterland, implying a kinematic and temporal connection with east directed contractional faulting in the foreland.en_US
dc.formatPDFen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.ispartofTectonicsen_US
dc.relation.ispartofseries0278-7407en_US
dc.rights©American Geophysical Union 1995. This is this the version of record co-published by the American Geophysical Union and John Wiley & Sons, Inc. It is made available under the CC-BY-NC-ND 4.0 license. Item should be cited as: Coker, J. E., Steltenpohl, M. G., Andresen, A., & Kunk, M. J. (1995). An 40Ar/39Ar thermochronology of the Ofoten‐Troms region: Implications for terrane amalgamation and extensional collapse of the northern Scandinavian Caledonides. Tectonics, 14(2), 435-447.en_US
dc.titleAn 40Ar/39Ar thermochronology of the Ofoten-Troms region: Implications for terrane amalgamation and extensional collapse of the northern Scandinavian Caledonidesen_US
dc.typeTexten_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume14en_US
dc.citation.issue2en_US
dc.citation.spage435en_US
dc.citation.epage447en_US
dc.description.statusPublisheden_US
dc.description.peerreviewYesen_US
dc.creator.orcid0000-0003-4424-7825en_US

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