Conduit formation and crustal microxenolith entrainment in a basaltic fissure eruption: Observations from Thríhnúkagígur Volcano, Iceland
Thríhnúkagígur Volcano, Iceland, is a composite spatter cone and lava field characteristic of basaltic fissure eruptions. Lava drainback at the end of the eruption left ~60 m of evacuated conduit, and a 4 × 104 m3 cave formed by the erosion of unconsolidated tephra by the feeder dike. Field relation...
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ftopenaccessrep:oai:zenodo.org:119967 2023-10-29T02:37:18+01:00 Conduit formation and crustal microxenolith entrainment in a basaltic fissure eruption: Observations from Thríhnúkagígur Volcano, Iceland Michael R Hudak Maureen D Feineman Peter C LaFemina Halldór Geirsson Samuele Agostini 2022-08-24 https://www.openaccessrepository.it/record/119967 https://doi.org/10.30909/vol.05.02.249270 und unknown url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/119967 doi:10.30909/vol.05.02.249270 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/ NEANIAS Atmospheric Research Community Earth and Planetary Sciences (miscellaneous) Geochemistry and Petrology Geology Geophysics info:eu-repo/semantics/article publication-article 2022 ftopenaccessrep https://doi.org/10.30909/vol.05.02.249270 2023-10-03T22:17:04Z Thríhnúkagígur Volcano, Iceland, is a composite spatter cone and lava field characteristic of basaltic fissure eruptions. Lava drainback at the end of the eruption left ~60 m of evacuated conduit, and a 4 × 104 m3 cave formed by the erosion of unconsolidated tephra by the feeder dike. Field relationships within the shallow plumbing system provide three-dimensional insight into conduit formation in fissure systems. Petrographic estimates and the relative volumes of the cave and erupted lavas both indicate xenolithic tephra comprises 5–10 % of the erupted volume, which cannot be reproduced by geochemical mixing models. Although crustal xenolith entrainment is not geochemically significant, we posit that this process may be common in the Icelandic crust. The Thríhnúkagígur eruption illustrates how pervasive, poorly consolidated tephra or hyaloclastite can act as a mechanically weak pre-existing structure that provides a preferential pathway for magma ascent and may influence vent location. Article in Journal/Newspaper Iceland Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository Volcanica 5 2 249 270 |
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Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository |
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ftopenaccessrep |
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unknown |
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NEANIAS Atmospheric Research Community Earth and Planetary Sciences (miscellaneous) Geochemistry and Petrology Geology Geophysics |
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NEANIAS Atmospheric Research Community Earth and Planetary Sciences (miscellaneous) Geochemistry and Petrology Geology Geophysics Michael R Hudak Maureen D Feineman Peter C LaFemina Halldór Geirsson Samuele Agostini Conduit formation and crustal microxenolith entrainment in a basaltic fissure eruption: Observations from Thríhnúkagígur Volcano, Iceland |
topic_facet |
NEANIAS Atmospheric Research Community Earth and Planetary Sciences (miscellaneous) Geochemistry and Petrology Geology Geophysics |
description |
Thríhnúkagígur Volcano, Iceland, is a composite spatter cone and lava field characteristic of basaltic fissure eruptions. Lava drainback at the end of the eruption left ~60 m of evacuated conduit, and a 4 × 104 m3 cave formed by the erosion of unconsolidated tephra by the feeder dike. Field relationships within the shallow plumbing system provide three-dimensional insight into conduit formation in fissure systems. Petrographic estimates and the relative volumes of the cave and erupted lavas both indicate xenolithic tephra comprises 5–10 % of the erupted volume, which cannot be reproduced by geochemical mixing models. Although crustal xenolith entrainment is not geochemically significant, we posit that this process may be common in the Icelandic crust. The Thríhnúkagígur eruption illustrates how pervasive, poorly consolidated tephra or hyaloclastite can act as a mechanically weak pre-existing structure that provides a preferential pathway for magma ascent and may influence vent location. |
format |
Article in Journal/Newspaper |
author |
Michael R Hudak Maureen D Feineman Peter C LaFemina Halldór Geirsson Samuele Agostini |
author_facet |
Michael R Hudak Maureen D Feineman Peter C LaFemina Halldór Geirsson Samuele Agostini |
author_sort |
Michael R Hudak |
title |
Conduit formation and crustal microxenolith entrainment in a basaltic fissure eruption: Observations from Thríhnúkagígur Volcano, Iceland |
title_short |
Conduit formation and crustal microxenolith entrainment in a basaltic fissure eruption: Observations from Thríhnúkagígur Volcano, Iceland |
title_full |
Conduit formation and crustal microxenolith entrainment in a basaltic fissure eruption: Observations from Thríhnúkagígur Volcano, Iceland |
title_fullStr |
Conduit formation and crustal microxenolith entrainment in a basaltic fissure eruption: Observations from Thríhnúkagígur Volcano, Iceland |
title_full_unstemmed |
Conduit formation and crustal microxenolith entrainment in a basaltic fissure eruption: Observations from Thríhnúkagígur Volcano, Iceland |
title_sort |
conduit formation and crustal microxenolith entrainment in a basaltic fissure eruption: observations from thríhnúkagígur volcano, iceland |
publishDate |
2022 |
url |
https://www.openaccessrepository.it/record/119967 https://doi.org/10.30909/vol.05.02.249270 |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/119967 doi:10.30909/vol.05.02.249270 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.30909/vol.05.02.249270 |
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Volcanica |
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5 |
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2 |
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249 |
op_container_end_page |
270 |
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1781061892494589952 |