Pre-eruptive volatile content, degassing paths and depressurisation explaining the transition in style at the subglacial rhyolitic eruption of Dalakvísl, South Iceland
Many volcanoes express a variety of contrasting eruptive styles with behavioural transitions between explosive and effusive activities. Understanding eruptive mechanisms is of key importance but we currently have little insight into the behavioural controls for rhyolitic eruptions beneath ice. This...
Published in: | Journal of Volcanology and Geothermal Research |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
2013
|
Subjects: | |
Online Access: | https://eprints.lancs.ac.uk/id/eprint/66411/ https://doi.org/10.1016/j.jvolgeores.2013.03.021 |
id |
ftulancaster:oai:eprints.lancs.ac.uk:66411 |
---|---|
record_format |
openpolar |
spelling |
ftulancaster:oai:eprints.lancs.ac.uk:66411 2023-08-27T04:10:08+02:00 Pre-eruptive volatile content, degassing paths and depressurisation explaining the transition in style at the subglacial rhyolitic eruption of Dalakvísl, South Iceland Owen, Jacqueline Tuffen, Hugh McGarvie, Dave 2013-05-15 https://eprints.lancs.ac.uk/id/eprint/66411/ https://doi.org/10.1016/j.jvolgeores.2013.03.021 unknown Owen, Jacqueline and Tuffen, Hugh and McGarvie, Dave (2013) Pre-eruptive volatile content, degassing paths and depressurisation explaining the transition in style at the subglacial rhyolitic eruption of Dalakvísl, South Iceland. Journal of Volcanology and Geothermal Research, 258. pp. 143-162. ISSN 0377-0273 Journal Article PeerReviewed 2013 ftulancaster https://doi.org/10.1016/j.jvolgeores.2013.03.021 2023-08-03T22:25:22Z Many volcanoes express a variety of contrasting eruptive styles with behavioural transitions between explosive and effusive activities. Understanding eruptive mechanisms is of key importance but we currently have little insight into the behavioural controls for rhyolitic eruptions beneath ice. This paper addresses a subglacial rhyolitic eruption at Dalakvísl in South Iceland that involved both explosive and effusive activities. We present measurements of pre- and post-eruptive magmatic volatile contents that we use to track magma degassing from the chamber to the surface and reconstruct pressure conditions during the eruption. Explosive and effusive phases involve significant differences in: (1) pre-eruptive volatile contents; (2) the ‘openness’ of magma degassing; and (3) inferred confining pressure. This final factor is potentially associated with a jökulhlaup-induced decompression. Due to the combination of these factors Dalakvísl experienced a change from effusive to explosive behaviour, although we cannot currently resolve cause from effect. Our work points towards complex interactions between the dynamics of magma ascent and the response of overlying ice and meltwater during rhyolitic eruptions beneath ice. Article in Journal/Newspaper Iceland Lancaster University: Lancaster Eprints Journal of Volcanology and Geothermal Research 258 143 162 |
institution |
Open Polar |
collection |
Lancaster University: Lancaster Eprints |
op_collection_id |
ftulancaster |
language |
unknown |
description |
Many volcanoes express a variety of contrasting eruptive styles with behavioural transitions between explosive and effusive activities. Understanding eruptive mechanisms is of key importance but we currently have little insight into the behavioural controls for rhyolitic eruptions beneath ice. This paper addresses a subglacial rhyolitic eruption at Dalakvísl in South Iceland that involved both explosive and effusive activities. We present measurements of pre- and post-eruptive magmatic volatile contents that we use to track magma degassing from the chamber to the surface and reconstruct pressure conditions during the eruption. Explosive and effusive phases involve significant differences in: (1) pre-eruptive volatile contents; (2) the ‘openness’ of magma degassing; and (3) inferred confining pressure. This final factor is potentially associated with a jökulhlaup-induced decompression. Due to the combination of these factors Dalakvísl experienced a change from effusive to explosive behaviour, although we cannot currently resolve cause from effect. Our work points towards complex interactions between the dynamics of magma ascent and the response of overlying ice and meltwater during rhyolitic eruptions beneath ice. |
format |
Article in Journal/Newspaper |
author |
Owen, Jacqueline Tuffen, Hugh McGarvie, Dave |
spellingShingle |
Owen, Jacqueline Tuffen, Hugh McGarvie, Dave Pre-eruptive volatile content, degassing paths and depressurisation explaining the transition in style at the subglacial rhyolitic eruption of Dalakvísl, South Iceland |
author_facet |
Owen, Jacqueline Tuffen, Hugh McGarvie, Dave |
author_sort |
Owen, Jacqueline |
title |
Pre-eruptive volatile content, degassing paths and depressurisation explaining the transition in style at the subglacial rhyolitic eruption of Dalakvísl, South Iceland |
title_short |
Pre-eruptive volatile content, degassing paths and depressurisation explaining the transition in style at the subglacial rhyolitic eruption of Dalakvísl, South Iceland |
title_full |
Pre-eruptive volatile content, degassing paths and depressurisation explaining the transition in style at the subglacial rhyolitic eruption of Dalakvísl, South Iceland |
title_fullStr |
Pre-eruptive volatile content, degassing paths and depressurisation explaining the transition in style at the subglacial rhyolitic eruption of Dalakvísl, South Iceland |
title_full_unstemmed |
Pre-eruptive volatile content, degassing paths and depressurisation explaining the transition in style at the subglacial rhyolitic eruption of Dalakvísl, South Iceland |
title_sort |
pre-eruptive volatile content, degassing paths and depressurisation explaining the transition in style at the subglacial rhyolitic eruption of dalakvísl, south iceland |
publishDate |
2013 |
url |
https://eprints.lancs.ac.uk/id/eprint/66411/ https://doi.org/10.1016/j.jvolgeores.2013.03.021 |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
Owen, Jacqueline and Tuffen, Hugh and McGarvie, Dave (2013) Pre-eruptive volatile content, degassing paths and depressurisation explaining the transition in style at the subglacial rhyolitic eruption of Dalakvísl, South Iceland. Journal of Volcanology and Geothermal Research, 258. pp. 143-162. ISSN 0377-0273 |
op_doi |
https://doi.org/10.1016/j.jvolgeores.2013.03.021 |
container_title |
Journal of Volcanology and Geothermal Research |
container_volume |
258 |
container_start_page |
143 |
op_container_end_page |
162 |
_version_ |
1775351956673396736 |