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The Kullaberg peninsula – a glimpse of the Proterozoic evolution of SW Fennoscandia

Author:
  • Ulf Söderlund
  • Christine Karlsson
  • Leif Johansson
  • Kent Larsson
Publishing year: 2008
Language: English
Pages: 1-10
Publication/Series: GFF
Volume: 130
Issue: Part 1
Document type: Journal article
Publisher: Taylor & Francis

Abstract english

The Kullaberg peninsula in NW Skåne renders km-long, continuous exposures of the Proterozoic crystalline basement. We report ion microprobe (SIMS) U–Pb zircon ages for six key lithologies at Kullaberg that constrain the geological history of SW Fennoscandia for a considerable time period. Igneous zircon in three varieties of gneiss granite yield ages of 1694±7 Ma, 1693±7 Ma and 1663±14 Ma, in the same age range as orthogneisses further north in the same crustal segment. Partial melting, manifested by formation of pegmatite dykes and veins, occurred at 1473±6 Ma. Emplacement of mafic dykes, today seen as a large number of north-trending amphibolite sheets across the Kullaberg peninsula, is dated at 961±6 Ma. The dykes, which fall in the same age range as the Blekinge-Dalarna dolerites (978–945 Ma) predate an event of amphibolite facies deformation, which presumably relates to exhumation of the crust following shortly after the Sveconorwegian compressional stage. A pegmatite was emplaced at 934±6 Ma after the crust had been exhumed through the ductile-brittle boundary.

Keywords

  • Geology
  • horst-graben
  • zircon
  • U–Pb SIMS
  • Skåne
  • Sorgenfrei-Tornquist zone

Other

Published
  • ISSN: 2000-0863
Leif Johansson
E-mail: leif [dot] johansson [at] geol [dot] lu [dot] se

Professor

Lithosphere and Biosphere Science

+46 46 222 98 87

+46 70 530 76 73

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