Widespread tephra dispersal and ignimbrite emplacement from a subglacial volcano (Torfajökull, Iceland)
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...
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ftopenunivgb:oai:oro.open.ac.uk:60532 2023-06-11T04:12:10+02:00 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. Halton, Alison M. 2019-06-01 application/pdf https://oro.open.ac.uk/60532/ https://oro.open.ac.uk/60532/1/Geology%202019%20Moles.pdf https://doi.org/10.1130/G46004.1 unknown https://oro.open.ac.uk/60532/1/Geology%202019%20Moles.pdf Moles, Jonathan D. <http://oro.open.ac.uk/view/person/jdm539.html>; McGarvie, Dave <http://oro.open.ac.uk/view/person/dwm4.html>; Stevenson, John A.; Sherlock, Sarah C. <http://oro.open.ac.uk/view/person/scs35.html>; Abbott, Peter M.; Jenner, Frances E. <http://oro.open.ac.uk/view/person/fej25.html> and Halton, Alison M. <http://oro.open.ac.uk/view/person/amh656.html> (2019). Widespread tephra dispersal and ignimbrite emplacement from a subglacial volcano (Torfajökull, Iceland). Geology, 47(6) pp. 577–580. Journal Item Public PeerReviewed 2019 ftopenunivgb https://doi.org/10.1130/G46004.1 2023-05-28T05:59:33Z 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. Article in Journal/Newspaper Greenland ice core Ice Sheet Iceland North Atlantic The Open University: Open Research Online (ORO) Greenland Torfajökull ENVELOPE(-19.027,-19.027,63.898,63.898) Geology 47 6 577 580 |
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Open Polar |
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The Open University: Open Research Online (ORO) |
op_collection_id |
ftopenunivgb |
language |
unknown |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Moles, Jonathan D. McGarvie, Dave Stevenson, John A. Sherlock, Sarah C. Abbott, Peter M. Jenner, Frances E. Halton, Alison M. |
spellingShingle |
Moles, Jonathan D. McGarvie, Dave Stevenson, John A. Sherlock, Sarah C. Abbott, Peter M. Jenner, Frances E. Halton, Alison M. Widespread tephra dispersal and ignimbrite emplacement from a subglacial volcano (Torfajökull, Iceland) |
author_facet |
Moles, Jonathan D. McGarvie, Dave Stevenson, John A. Sherlock, Sarah C. Abbott, Peter M. Jenner, Frances E. Halton, Alison M. |
author_sort |
Moles, Jonathan D. |
title |
Widespread tephra dispersal and ignimbrite emplacement from a subglacial volcano (Torfajökull, Iceland) |
title_short |
Widespread tephra dispersal and ignimbrite emplacement from a subglacial volcano (Torfajökull, Iceland) |
title_full |
Widespread tephra dispersal and ignimbrite emplacement from a subglacial volcano (Torfajökull, Iceland) |
title_fullStr |
Widespread tephra dispersal and ignimbrite emplacement from a subglacial volcano (Torfajökull, Iceland) |
title_full_unstemmed |
Widespread tephra dispersal and ignimbrite emplacement from a subglacial volcano (Torfajökull, Iceland) |
title_sort |
widespread tephra dispersal and ignimbrite emplacement from a subglacial volcano (torfajökull, iceland) |
publishDate |
2019 |
url |
https://oro.open.ac.uk/60532/ https://oro.open.ac.uk/60532/1/Geology%202019%20Moles.pdf https://doi.org/10.1130/G46004.1 |
long_lat |
ENVELOPE(-19.027,-19.027,63.898,63.898) |
geographic |
Greenland Torfajökull |
geographic_facet |
Greenland Torfajökull |
genre |
Greenland ice core Ice Sheet Iceland North Atlantic |
genre_facet |
Greenland ice core Ice Sheet Iceland North Atlantic |
op_relation |
https://oro.open.ac.uk/60532/1/Geology%202019%20Moles.pdf Moles, Jonathan D. <http://oro.open.ac.uk/view/person/jdm539.html>; McGarvie, Dave <http://oro.open.ac.uk/view/person/dwm4.html>; Stevenson, John A.; Sherlock, Sarah C. <http://oro.open.ac.uk/view/person/scs35.html>; Abbott, Peter M.; Jenner, Frances E. <http://oro.open.ac.uk/view/person/fej25.html> and Halton, Alison M. <http://oro.open.ac.uk/view/person/amh656.html> (2019). Widespread tephra dispersal and ignimbrite emplacement from a subglacial volcano (Torfajökull, Iceland). Geology, 47(6) pp. 577–580. |
op_doi |
https://doi.org/10.1130/G46004.1 |
container_title |
Geology |
container_volume |
47 |
container_issue |
6 |
container_start_page |
577 |
op_container_end_page |
580 |
_version_ |
1768387850714218496 |