Disputas: Jarkko Tapani Lamminen
Jarkko Tapani Lamminen ved Department of Geosciences vil forsvare sin avhandling for graden ph.d. (philosophiae doctor): Basin analysis using zircon U-Pb and Hf isotopes: Provenance of Mesoproterozoic Telemark Supracrustals and Neoproterozoic Baltoscandian margin sediments, South Norway
Professor Stefan Claesson, Swedish Museum of Natural History, Stockholm
Dr Øystein Nordgulen, The Geological Survey of Norway (NGU), Trondheim
Professor Roy H. Gabrielsen, Department of Geosciences, University of Oslo
Leder av disputas: Professor Nils Roar Sælthun
Veileder: Prof. Tom Andersen and Prof. Johan Petter Nystuen
This thesis is about ca. 1500-600 million years old sedimentary rocks in South Norway deposited when the crust was experiencing rifting during formation and subsequent breakup of an ancient supercontinent with sedimentary basins established at various stages. The geological environment was similar to Mesozoic basins in the North Sea and Norwegian Sea, where petroleum is found today. The source of the sediments is studied using latest geochemical methods. The thesis shows that the sediment sourcing is strongly related to movements in the crust and to changes in landscape and drainage systems through times, in addition to sediment reworking and redistribution within drainage areas and depositional basins. Sediments, like gravel and sand, are mainly locally derived in the beginning of a rifting process and more distally derived at the end. It is also shown that the crustal architecture of the basement rocks can be read from the sediments. This is particularly useful when the basement rocks are covered or otherwise not present anymore. This thesis also points out that geochemical methods can be used as correlation tools for sandstones and by this reason be of practical application in subsurface mapping and exploration of oil bearing rocks in subsurface basins, like the continental shelf of Norway.
For mer informasjon, kontakt Anne Innes.