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Journal of the Geological Society; 2009; v. 166; issue.1; p. 147-158;
DOI: 10.1144/0016-76492008-023
© 2009 Geological Society of London

Research Article

Timing of migmatization and granite genesis in the Northwestern Terrane of Svalbard, Norway: implications for regional correlations in the Arctic Caledonides

C.H. Pettersson1, A.M. Tebenkov2, A.N. Larionov3, A. Andresen4 & V. Pease1

1 Department of Geology and Geochemistry, Stockholm University, Stockholm SE-106 91, Sweden
2 Polar Marine Geological Expedition, Pobeda Street 24, Lomonosov 189 510, Russia
3 A. P. Karpinsky Russian Geological Research Institute (VSEGEI) 74 Sredny Pr., St. Petersburg 199106, Russia
4 Department of Geosciences, PO Box 1047 Blindern, NO-0316 Oslo, Norway

Corresponding author (e-mail: calle{at}geo.su.se)

U–Pb ion microprobe investigations of zircons from gneisses, granites and migmatites of the pre-Devonian Smerenburgfjorden and Richarddalen Complexes constrain the tectonic evolution and origin of Svalbard's Northwestern Terrane. Field relationships combined with U–Pb age data indicate that a late Meso- to Neoproterozoic metapelitic protolith was intruded by Tonian (c. 960 Ma) granitoids and suggest that the entire Northwestern Terrane is underlain by early Neoproterozoic granitoids intruding older metasediments. Both rock types were later involved in Caledonian deformation, with subsequent migmatization and granite genesis at c. 435–420 Ma. Ages of inherited zircons in granites and migmatites reflect anatexis of this late Meso- to Neoproterozoic protolith, with zircon xenocrysts ranging in age from c. 1030 to 1820 Ma. Pronounced lithological, geochronological and tectonothermal similarities to NE Svalbard (Nordaustlandet) and the Krummedal supracrustal sequence of East Greenland suggest a strong correlation between Svalbard and East Greenland prior to Caledonian orogenesis.

Supplementary material: Ion microprobe analytical methods, data table and zircon descriptions are available at http://www.geolsoc.org.uk/SUP18326.





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K.A. CUTTS, M. HAND, D.E. KELSEY, B. WADE, R.A. STRACHAN, C. CLARK, and A. NETTING
Evidence for 930 Ma metamorphism in the Shetland Islands, Scottish Caledonides: implications for Neoproterozoic tectonics in the Laurentia-Baltica sector of Rodinia
Journal of the Geological Society, 2009; 166: 1033 - 1047.
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