Åse Hestnes

Preliminary results from apatite thermochronology and U-Pb calcite geochronology – insight into the topographic evolution of Western Norway

Hestnes, Å.¹, Jacobs, J.¹, Drost, K.², Dunkl, I.³, Gasser, D.^4,5, Ksienzyk, A.K.⁵, Scheiber, T.⁴, Sømme, T.^1,6, Mayer-Ullmann, F.¹, Chew, D.²

¹ Department of Geoscience, University of Bergen
² Department of Geology, Trinity College Dublin, The University of Dublin
³ Sedimentology and Environmental Geology, Geoscience Centre, University of Göttingen
⁴ Department of Environmental Sciences, Western Norway University of Applied Sciences, Campus Sogndal
⁵ Geological Survey of Norway
⁶ Equinor, Oslo

By using apatite in thermochronological studies, we can unravel the cooling history, and thus potentially the erosion history of the uppermost continental crust (<120°C). We have collected an extensive dataset for thermochronological studies from Western Norway, located between the Sognefjorden in the south and the Møre Margin in the north. During Geolunch, I will present new results from both Apatite Fission Track (AFT) and (U-Th)/He apatite thermochronology. These data are combined to make time-temperature models, both for single samples and as a multi-model of a vertical profile. Such a multi-model of a vertical profile has not been done before in Norway and I will illustrate how it can be used as a tool to understand the topographic evolution of a region. In addition, I will show the results from the first U-Pb Calcite analyses done in Norway.