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Leif Johansson

Leif Johansson

Professor

Leif Johansson

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

Author

  • Ulf Söderlund
  • Christine Karlsson
  • Leif Johansson
  • Kent Larsson

Summary, in 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.

Department/s

  • Lithosphere and Biosphere Science

Publishing year

2008

Language

English

Pages

1-10

Publication/Series

GFF

Volume

130

Issue

Part 1

Document type

Journal article

Publisher

Taylor & Francis

Topic

  • Geology

Keywords

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

Status

Published

ISBN/ISSN/Other

  • ISSN: 2000-0863