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Widespread tephra dispersal and ignimbrite emplacement from a subglacial volcano (Torfajökull, Iceland)

Moles, Jonathan D.; McGarvie, Dave; Stevenson, John A.; Sherlock, Sarah C.; Abbott, Peter M.; Jenner, Frances E. and Halton, Alison M. (2019). Widespread tephra dispersal and ignimbrite emplacement from a subglacial volcano (Torfajökull, Iceland). Geology (Early Access).

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DOI (Digital Object Identifier) Link: https://doi.org/10.1130/G46004.1
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Abstract

The tephra dispersal mechanisms of rhyolitic glaciovolcanic eruptions are little known, but can be investigated through the correlation of eruptive products across multiple depositional settings. Using geochemistry and geochronology, we correlate a regionally important Pleistocene tephra horizon—the rhyolitic component of North Atlantic Ash Zone II (II-RHY-1)—and the Thórsmörk Ignimbrite with rhyolitic tuyas at Torfajökull volcano, Iceland. The eruption breached an ice mass >400 m thick, leading to the widespread dispersal of II-RHY-1 across the North Atlantic and the Greenland ice sheet. Locally, pyroclastic density currents traveled across the ice surface, depositing the variably welded Thórsmörk Ignimbrite beyond the ice margin and ~30 km from source. The widely dispersed products of this eruption represent a valuable isochronous tie line between terrestrial, marine, and ice-core paleoenvironmental records. Using the tephra horizon, estimates of ice thickness and extent derived from the eruption deposits can be directly linked to the regional climate archive, which records the eruption at the onset of Greenland Stadial 15.2.

Item Type: Journal Item
Copyright Holders: 2019 The Authors
ISSN: 0091-7613
Project Funding Details:
Funded Project NameProject IDFunding Body
CENTA 2017 intakeNE/L002493/1NERC (Natural Environment Research Council)
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Environment, Earth and Ecosystem Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Item ID: 60532
Depositing User: Frances Jenner
Date Deposited: 24 Apr 2019 08:56
Last Modified: 04 May 2019 20:12
URI: http://oro.open.ac.uk/id/eprint/60532
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