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Grenvillian and Caledonian evolution of eastern Svalbard - a tale of two orogenies
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2005 (Engelska)Ingår i: Terra Nova, ISSN 0954-4879, E-ISSN 1365-3121, Vol. 17, nr 4, s. 317-325Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Svalbard is located in the north-west corner of the Barents Sea shelf and the Eurasian Plate, in a key area for interpreting Caledonian and older orogens in the Arctic region. Recent U-Pb dating in the Nordaustlandet Terrane of eastern Svalbard shows this terrane to consist of a Grenville-age basement, overlain by Neoproterozoic to early Palaeozoic platformal sediments, and intruded by Caledonian anatectic granites. Deformation, metamorphism and crustal anatectic magmatism occurred both during the Grenvillian (960-940 Ma) and Caledonian (450-410 Ma) orogenies. This evolution shows great similarities with that of eastern Greenland. In the classical model, eastern Svalbard is placed outboard of central east Greenland in pre-Caledonian time. Alternatively, it may have been located north-east of Greenland and transferred west and rotated anticlockwise during Caledonian continent-continent collision. In the Neoproterozoic, easternmost Svalbard may have been part of a wider area of Grenville-age crust, now fragmented and dispersed around the Arctic.

Ort, förlag, år, upplaga, sidor
Swedish Museum Nat Hist, Lab Isotope Geol, SE-10405 Stockholm, Sweden. Uppsala Univ, Dept Earth Sci, SE-75236 Uppsala, Sweden. Norwegian Polar Res Inst, IASC, NO-0302 Oslo, Norway. Polar Marine Geol Expedit, Lomonosov 189510, Russia., 2005. Vol. 17, nr 4, s. 317-325
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URN: urn:nbn:se:polar:diva-3409DOI: 10.1111/j.1365-3121.2005.00616.xISI: 000230602400003OAI: oai:DiVA.org:polar-3409DiVA, id: diva2:1077432
Tillgänglig från: 2017-02-27 Skapad: 2017-02-27 Senast uppdaterad: 2017-11-29

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