1. Institute of Earth Sciences University of Iceland Sturlugata 7 Is‐102 Reykjavík Iceland
2. Department of Earth Sciences University of Gothenburg 405 30 Gothenburg Sweden
3. Icelandic Institute of Natural History Borgir við Norðurslóð 600 Akureyri Iceland
4. Globe Institute University of Copenhagen Øster Voldgade 5 DK‐1350 Copenhagen Denmark
5. British Geological Survey, The Lyell Centre Research Avenue South Edinburgh EH14 4AP UK