Using volatiles in magma to decipher subglacial eruption dynamics
Eruptions beneath ice sheets and glaciers can generate hazardous ash plumes and powerful meltwater floods, as demonstrated by the recent Icelandic eruptions at Eyjafjallajökull in 2010 and at Grímsvötn in 2011. A key scientific objective for volcanologists is to better understand the factors control...
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ftulancaster:oai:eprints.lancs.ac.uk:78141 2023-08-27T04:09:19+02:00 Using volatiles in magma to decipher subglacial eruption dynamics Owen, Jacqueline 2016-01-27 https://eprints.lancs.ac.uk/id/eprint/78141/ https://doi.org/10.1111/gto.12127 unknown Owen, Jacqueline (2016) Using volatiles in magma to decipher subglacial eruption dynamics. Geology Today, 32 (1). pp. 30-37. ISSN 0266-6979 Journal Article NonPeerReviewed 2016 ftulancaster https://doi.org/10.1111/gto.12127 2023-08-03T22:28:53Z Eruptions beneath ice sheets and glaciers can generate hazardous ash plumes and powerful meltwater floods, as demonstrated by the recent Icelandic eruptions at Eyjafjallajökull in 2010 and at Grímsvötn in 2011. A key scientific objective for volcanologists is to better understand the factors controlling subglacial eruptions, but the eruptions are mostly hidden beneath ice that is often hundreds of metres thick, thereby preventing direct observation. New approaches are therefore needed to reconstruct the factors driving explosive activity and the response of the overlying ice. The dissolved volatile content, preserved in glassy volcanic rock, offers a useful means of reconstructing palaeo-ice thicknesses. However, for subglacial rhyolite at least, there seems to be little or no correlation between loading pressure and eruptive style. Instead, there is a strong correlation between the pre-eruptive volatile content, degassing path and eruptive behaviour. It seems that the style of many subglacial eruptions is controlled by the same mechanisms as subaerial eruptions, with explosivity strongly influenced by degassing and magmatic fragmentation. Article in Journal/Newspaper Eyjafjallajökull Lancaster University: Lancaster Eprints Geology Today 32 1 30 37 |
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Lancaster University: Lancaster Eprints |
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Eruptions beneath ice sheets and glaciers can generate hazardous ash plumes and powerful meltwater floods, as demonstrated by the recent Icelandic eruptions at Eyjafjallajökull in 2010 and at Grímsvötn in 2011. A key scientific objective for volcanologists is to better understand the factors controlling subglacial eruptions, but the eruptions are mostly hidden beneath ice that is often hundreds of metres thick, thereby preventing direct observation. New approaches are therefore needed to reconstruct the factors driving explosive activity and the response of the overlying ice. The dissolved volatile content, preserved in glassy volcanic rock, offers a useful means of reconstructing palaeo-ice thicknesses. However, for subglacial rhyolite at least, there seems to be little or no correlation between loading pressure and eruptive style. Instead, there is a strong correlation between the pre-eruptive volatile content, degassing path and eruptive behaviour. It seems that the style of many subglacial eruptions is controlled by the same mechanisms as subaerial eruptions, with explosivity strongly influenced by degassing and magmatic fragmentation. |
format |
Article in Journal/Newspaper |
author |
Owen, Jacqueline |
spellingShingle |
Owen, Jacqueline Using volatiles in magma to decipher subglacial eruption dynamics |
author_facet |
Owen, Jacqueline |
author_sort |
Owen, Jacqueline |
title |
Using volatiles in magma to decipher subglacial eruption dynamics |
title_short |
Using volatiles in magma to decipher subglacial eruption dynamics |
title_full |
Using volatiles in magma to decipher subglacial eruption dynamics |
title_fullStr |
Using volatiles in magma to decipher subglacial eruption dynamics |
title_full_unstemmed |
Using volatiles in magma to decipher subglacial eruption dynamics |
title_sort |
using volatiles in magma to decipher subglacial eruption dynamics |
publishDate |
2016 |
url |
https://eprints.lancs.ac.uk/id/eprint/78141/ https://doi.org/10.1111/gto.12127 |
genre |
Eyjafjallajökull |
genre_facet |
Eyjafjallajökull |
op_relation |
Owen, Jacqueline (2016) Using volatiles in magma to decipher subglacial eruption dynamics. Geology Today, 32 (1). pp. 30-37. ISSN 0266-6979 |
op_doi |
https://doi.org/10.1111/gto.12127 |
container_title |
Geology Today |
container_volume |
32 |
container_issue |
1 |
container_start_page |
30 |
op_container_end_page |
37 |
_version_ |
1775350518962454528 |