Basin modelling of a complex rift system: The Northern Vøring Volcanic Margin case example

Extensional processes can lead to complex crustal configuration depending on the mechanisms of lithospheric thinning and impact magmatic additions during rifting breakup. In this context, we studied Vøring volcanic passive margin offshore Norway. The evolution inner Margin is well explained by standard models lithosphere extension. However, these fail reproduce key observations at outer (volcanic) province such as regional uplift time breakup excess magmatism. Therefore, additional are required explain observations. Excess magmatism have been related mantle arrival hot Icelandic ‘plume’ or small-scale convection processes. Melt retention in asthenosphere has also proposed uplift. At last, phase transitions extension may contribute We present tectonic thermal basin along a seismic profile crossing Northern Margin. isostatic history basins constrained through time-forward modelling based an automated inverse reconstruction approach. Two scenarios evaluated: first one includes pronounced stretching last late Cretaceous-Paleocene event, second Paleocene-early Eocene thinning, around 56–54 Ma. Models incorporating taking into account (melt underplate) satisfactorily specific margin. This result supports contribution Iceland plume Our results indicate that thin-crust produce partially serpentinized beneath highly extended parts Basin. model fails suggests serpentinization occur locally but could not entire lower body nature.