Fractures in a trachyandesitic lava at Öræfajökull, Iceland, used to infer subglacial emplacement in 1727–8 eruption

• Published in: Journal of Volcanology and Geothermal Research
• Main Authors: Forbes, Anne E.S., Blake, Steven, Tuffen, Hugh, Wilson, Andrew
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: 2014
• Subjects: Slaga; glacier; Iceland
• Online Access: https://eprints.lancs.ac.uk/id/eprint/71380/; https://doi.org/10.1016/j.jvolgeores.2014.10.004

We present detailed field observations of cooling fractures in a small-volume trachyandesitic lava, informally named the Slaga lava, on the south west flank of Öræfajökull volcano, south east Iceland. Columnar joints, pseudopillow fracture systems, and curved platy jointing occur in the lava, whose...