Répertoire du personnel
Jean-Paul Liégeois
Sciences de la Terre
Géodynamique et ressources minérales
Géodynamique et ressources minérales
Détails
Bingen, B, Skår, Ø, Marker, M, Sigmond, E.M.O, Nordgulen, Ø, Ragnhildsveit, J, Mansfeld, J, Tucker, R.D. & Liégeois, J.P. 2005. ‘Timing of continental building in the Sveconorwegian orogen, SW Scandinavia’. Norwegian Journal of Geology 85: 87-116. ISSN: 029-196X. I.F. 0.548.
Article dans une revue scientifique / Article dans un périodique
The timing of continental building in the Sveconorwegian orogen of SW Scandinavia is evaluated with zircon U-Pb geochronology. ID-TIMS, LA-ICPMS and SIMS data are reported for 21 samples of orthogneiss, metarhyolite and metasandstone in S Norway, with emphasis on the Suldal area. The Sveconorwegian orogen is divided into one Fennoscandian 1.80-1.64 Ga parautochtonous segment, the Eastern Segment, and two allochthonous terranes. The Idefjorden terrane is interpreted as a composite 1.66-1.52 Ga arc formed at the margin or near the margin of Fennoscandia. The western terrane, including the Telemark, Hardangervidda, Suldal and Rogaland-Vest Agder sectors, is named Telemarkia. U-Pb zircon data indicate that Telemarkia was build during a short magmatic event between 1.52 and 1.48 Ga, and was located at the margin of a Palaeoproterozoic craton, possibly Fennoscandia. No basement older than 1.5 Ga can be positively identified. In the early stage of the Sveconorwegian orogeny, Telemarkia collided with the Idefjorden terrane. The Bamble-Kongsberg sector, characterized by a mixed lithology and 1.13-1.10 Ga early-Sveconorwegian high-grade metamorphism, is interpreted as the original collision zone between these terranes.