The ups and downs during the eruption of Fagradalsfjall (Iceland): conduit convection recorded in melt embayments?
The recent Fagradasfjall (Iceland) rifting event lasted for 6 months and brought to the surface primitive magma from an around 20km deep source [1]. We gathered olivine-hosted melt embayments from tephra produced by lava fountain events between de 21 th of March and 4 th of April 2021. We measured H...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5019824 2023-10-01T03:56:53+02:00 The ups and downs during the eruption of Fagradalsfjall (Iceland): conduit convection recorded in melt embayments? Georgeais, G. Moussallam, Y. Koga, K. Rose-Koga, E. 2023 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019824 eng eng info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-3997 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019824 XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) info:eu-repo/semantics/conferenceObject 2023 ftgfzpotsdam https://doi.org/10.57757/IUGG23-3997 2023-09-03T23:42:28Z The recent Fagradasfjall (Iceland) rifting event lasted for 6 months and brought to the surface primitive magma from an around 20km deep source [1]. We gathered olivine-hosted melt embayments from tephra produced by lava fountain events between de 21 th of March and 4 th of April 2021. We measured H 2 O, CO 2 and S diffusion profiles by nanoSIMS and obtained mean conduit magma ascent rates ranging between 0.006 and 0.26 MPa/s (0.2 to 10 m/s) from diffusion modeling. During magma ascent, melt embayment typically records simple diffusion profiles with volatile species diffusing from the core of the embayment to the outside. In a few cases, however, we found CO 2 and S profiles indicative of a slow volatile re-enrichment step at-depth. We interpret this behavior as downward magma movement prior to final ascent. We modified our EMBER software to model the impact of magma convection on embayment profiles and explored the timescales involved with such dynamic at the 2021 Fagradasfjall eruption.[1] Halldórsson et al., Nature, 602, 2022 Conference Object Iceland GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
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Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
English |
description |
The recent Fagradasfjall (Iceland) rifting event lasted for 6 months and brought to the surface primitive magma from an around 20km deep source [1]. We gathered olivine-hosted melt embayments from tephra produced by lava fountain events between de 21 th of March and 4 th of April 2021. We measured H 2 O, CO 2 and S diffusion profiles by nanoSIMS and obtained mean conduit magma ascent rates ranging between 0.006 and 0.26 MPa/s (0.2 to 10 m/s) from diffusion modeling. During magma ascent, melt embayment typically records simple diffusion profiles with volatile species diffusing from the core of the embayment to the outside. In a few cases, however, we found CO 2 and S profiles indicative of a slow volatile re-enrichment step at-depth. We interpret this behavior as downward magma movement prior to final ascent. We modified our EMBER software to model the impact of magma convection on embayment profiles and explored the timescales involved with such dynamic at the 2021 Fagradasfjall eruption.[1] Halldórsson et al., Nature, 602, 2022 |
format |
Conference Object |
author |
Georgeais, G. Moussallam, Y. Koga, K. Rose-Koga, E. |
spellingShingle |
Georgeais, G. Moussallam, Y. Koga, K. Rose-Koga, E. The ups and downs during the eruption of Fagradalsfjall (Iceland): conduit convection recorded in melt embayments? |
author_facet |
Georgeais, G. Moussallam, Y. Koga, K. Rose-Koga, E. |
author_sort |
Georgeais, G. |
title |
The ups and downs during the eruption of Fagradalsfjall (Iceland): conduit convection recorded in melt embayments? |
title_short |
The ups and downs during the eruption of Fagradalsfjall (Iceland): conduit convection recorded in melt embayments? |
title_full |
The ups and downs during the eruption of Fagradalsfjall (Iceland): conduit convection recorded in melt embayments? |
title_fullStr |
The ups and downs during the eruption of Fagradalsfjall (Iceland): conduit convection recorded in melt embayments? |
title_full_unstemmed |
The ups and downs during the eruption of Fagradalsfjall (Iceland): conduit convection recorded in melt embayments? |
title_sort |
ups and downs during the eruption of fagradalsfjall (iceland): conduit convection recorded in melt embayments? |
publishDate |
2023 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019824 |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-3997 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019824 |
op_doi |
https://doi.org/10.57757/IUGG23-3997 |
_version_ |
1778527520359972864 |