Tephra layers with Icelandic provenance have been identified across the North Atlantic region in terrestrial, lacustrine, marine and glacial environments. These tephra layers are used as marker horizons in tephrochronology including climate studies, archaeology and environmental change. The major element chemistries of 19 proximally deposited Holocene Icelandic silicic tephra layers confirm that individual volcanic systems have unique geochemical signatures and that eruptions from the same system can often be distinguished. In addition, glass trace element chemistry highlights subtle geochemical variations between tephra layers which appear to have identical major element chemistry and thus allows for the identification of some, if not all, tephra layers previously considered identical in composition. This paper catalogues the compositional variation between the widespread Holocene Icelandic silicic tephra deposits.
We acknowledge and thank the following for their support. Margaret Hartley, Ben Schupack, Anna Jagan, Tomos Davies, Tanya Jude‐Eton, Katie Roberts, Jo Variava, Jónas Guðnason for their assistance with fieldwork. Rannís and the University of Edinburgh for funding the research. Pete Abbott and Siwan Davies for their proofreading and helpful comments. Finally, the reviewers and the Editor are thanked for their comments and suggestions, which have helped to improve the quality of this paper.
Copyright © 2019 John Wiley & Sons, Ltd.