Norwegian version of this page

Disputation and trial lecture: Øyvind Sunde

Øyvind Sunde at the Natural History Museum will be defending the thesis "Mineralogy and geochemistry of pegmatites in the Larvik Plutonic Complex, Norway" for the degree of PhD.

Trial lecture

Bildet kan inneholde: botanikk, tre.
Foto: Privat

Time: Friday 27 September at 10:15
Place: Tøyen Hovedgård

The candidate will give a trial lecture on the given topic:

Mineralisation associated with pegmatites

Adjudication committee

  • Professor Frances Wall, University of Exeter, United Kingdom
  • Dr. Erik Jonsson, Sveriges Geologiska Undersökning, Sverige
  • Professor Hans Arne Nakrem, Natural History museum, University of Oslo


Chair of defence

Research director at Natural History Museum Professor Jan Terje Lifjeld

Short presentation of the thesis

Peculiar rocks consisting of large and rare minerals are known as nepheline syenite pegmatites and can be found in larvikite (national rock of Norway!) around the Larvik area. Detailed chemical analyses of a mineral called wöhlerite, which is rare on the global scale but common in the pegmatites, reveal a close relationship of the pegmatites to the host larvikite. These pegmatites have a unique internal structure of mineral distribution, and may be distinguished based on their mineral assemblages. Boron isotopic composition of tourmaline and hambergite reveal that external fluids have interacted with the early melt. Such boron isotope data is particular interesting for the research community, because they represent a unique geochemical system where boron isotopes are poorly studied. Furthermore, this study developed hambergite as a new host for boron isotopes. 
Studies of how these pegmatites form is important scientifically to develop our understanding of these geological systems, and commercially because this group of rocks are potential sources for important strategic elements.


Elisabeth Aronsen


Naturhistorisk museum
Published Sep. 13, 2019 8:48 AM - Last modified Jan. 5, 2021 8:50 PM