A series of offshore intra-basinal igneous centres have been documented across the North Atlantic Igneous Province including the United Kingdom, Ireland and Greenland. However, inconsistent cross-border terminology implies that similar features are not present in the Norwegian offshore which, in turns, leads to misperceptions of cross-border geological differences. This manuscript presents evidence for a series of Norwegian igneous centres and suggests a consistent non-genetic cross-border terminology. In the Møre Basin, several igneous centres sit close to the continent ocean boundary (COB) which have previously been identified as seamounts and/or „outer highs‟. To provide cross-border consistency these features are consolidated under umbrella terms; igneous centres or volcanic fissures. Further centres are likely present within the Møre Basin (east of the COB) where 3D seismic data were not available. In the Vøring Basin two new igneous centres, one intrusive and one extrusive, are identified within the continental domain. Additionally, a possible deep magmatic upwelling associated with the regionally significant T-Reflector is identified. These igneous centre end-members represent the complexity of the magmatic plumbing across the Norwegian margin. With further data it is likely that further igneous centres will be identified offshore mid Norway.
The authors would like to thank A/S Norske Shell for permission to publish this work. Kari Berge, Petter Frantzen, Christian Gibson, and John Keating are thanked for their support, and Sonya Eide is recognised for her mapping help. Tony Doré, Craig Magee and Christian Berndt are thanked for their constructive reviews which greatly improved the manuscript and Douglas Watson is acknowledged for his input on seminal papers. Workers such as Sverre Planke and Laurent Gernigon are thanked for their fundamental contributions to the literature which has made this work possible. All observation and interpretation work were undertaken in Schlumberger‟s Petrel 2018 software with supporting material in ESRI‟s
ArcMap 10.4.1. Seismic data examples are from released datasets. Bouguer gravity residual products are sourced from TGS (licenced by A/S Norske Shell) and the Gravimetric Bureau (freely available to the University of Aberdeen). Magnetic regional grids are sourced from Frogtech Geoscience (licenced by A/S Norske Shell). Funding was provided by A/S Norske Shell.
- Igneous Centres
- Volcanic Systems
- Seismic Interpretation
- United Kingdom