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International Journal of Earth Sciences

, Volume 91, Issue 6, pp 955–963 | Cite as

U–Pb ages of the Dalsfjord Complex, SW Norway, and their bearing on the correlation of allochthonous crystalline segments of the Scandinavian Caledonides

  • Fernando Corfu
  • Torgeir B. Andersen
Original Paper

Abstract.

The Dalsfjord Complex is an allochthonous crystalline unit in the hanging wall of a major extensional detachment of the Caledonian orogen on the western coast of Norway. U–Pb geochronology has been carried out to test a previously proposed correlation between this unit and the Jotun Nappe Complex, a member of the Middle Allochthon now occupying a foreland position to the east. A monzonite sample of the Dalsfjord suite yields a zircon age of 1,634±3 Ma, whereas a crosscutting gabbro was formed at 1,464±6 Ma. Both rocks were strongly overprinted during the Sveconorwegian orogeny, especially the monzonite whose zircons U–Pb data were strongly pulled towards a lower intercept age of 882±29 Ma, and whose titanite indicates a two-stage growth history at >960 Ma and <920 Ma. These relationships support the correlation of these units with the Jotun Complex, and to some degree also with the Lindås Nappe in the Bergen Arcs.

Caledonides Dalsfjord Jotun U–Pb geochronology Zircon Titanite Proterozoic 

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Copyright information

© Springer-Verlag 2002

Authors and Affiliations

  • Fernando Corfu
    • 1
  • Torgeir B. Andersen
    • 2
  1. 1.Geological Museum, University of Oslo, P.O. Box 1172 Blindern, 0318 Oslo, NorwayOsloNorway
  2. 2.Institute of Geology, University of Oslo, P.O. Box 1047 Blindern, 0316 Oslo, NorwayOsloNorway

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