Morphology and dynamics of inflated subaqueous basaltic lava flows
International audience During eruptions onto low slopes, basaltic Pahoehoe lava can form thin lobes that progressively coalesce and inflate to many times their original thickness, due to a steady injection of magma beneath brittle and viscoelastic layers of cooled lava that develop sufficient streng...
Published in: | Geochemistry, Geophysics, Geosystems |
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Online Access: | https://hal-insu.archives-ouvertes.fr/insu-01003996 https://hal-insu.archives-ouvertes.fr/insu-01003996/document https://hal-insu.archives-ouvertes.fr/insu-01003996/file/ggge.deschamps.pdf https://doi.org/10.1002/2014GC005274 |
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ftinsu:oai:HAL:insu-01003996v1 2023-06-18T03:41:24+02:00 Morphology and dynamics of inflated subaqueous basaltic lava flows Deschamps, Anne Grigné, Cécile Le Saout, Morgane Soule, Samuel Adam Allemand, Pascal van Vliet-Lanoë, Brigitte Floc'H, France Domaines Océaniques (LDO) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Observatoire des Sciences de l'Univers-Institut d'écologie et environnement-Centre National de la Recherche Scientifique (CNRS) Department of Geology and Geophysics Woods Hole Woods Hole Oceanographic Institution (WHOI) Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE) École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS) 2014-06-04 https://hal-insu.archives-ouvertes.fr/insu-01003996 https://hal-insu.archives-ouvertes.fr/insu-01003996/document https://hal-insu.archives-ouvertes.fr/insu-01003996/file/ggge.deschamps.pdf https://doi.org/10.1002/2014GC005274 en eng HAL CCSD AGU and the Geochemical Society info:eu-repo/semantics/altIdentifier/doi/10.1002/2014GC005274 insu-01003996 https://hal-insu.archives-ouvertes.fr/insu-01003996 https://hal-insu.archives-ouvertes.fr/insu-01003996/document https://hal-insu.archives-ouvertes.fr/insu-01003996/file/ggge.deschamps.pdf doi:10.1002/2014GC005274 info:eu-repo/semantics/OpenAccess ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal-insu.archives-ouvertes.fr/insu-01003996 Geochemistry, Geophysics, Geosystems, 2014, 15 (6), pp.2128-2150. ⟨10.1002/2014GC005274⟩ tumulus eruption cooling Pahoehoe East Pacific rise inflation [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2014 ftinsu https://doi.org/10.1002/2014GC005274 2023-06-06T01:28:08Z International audience During eruptions onto low slopes, basaltic Pahoehoe lava can form thin lobes that progressively coalesce and inflate to many times their original thickness, due to a steady injection of magma beneath brittle and viscoelastic layers of cooled lava that develop sufficient strength to retain the flow. Inflated lava flows forming tumuli and pressure ridges have been reported in different kinds of environments, such as at contemporary subaerial Hawaiian-type volcanoes in Hawaii, La Réunion and Iceland, in continental environments (states of Oregon, Idaho, Washington), and in the deep sea at Juan de Fuca Ridge, the Galapagos spreading center, and at the East Pacific Rise (this study). These lava have all undergone inflation processes, yet they display highly contrasting morphologies that correlate with their depositional environment, the most striking difference being the presence of water. Lava that have inflated in subaerial environments display inflation structures with morphologies that significantly differ from subaqueous lava emplaced in the deep sea, lakes, and rivers. Their height is 2-3 times smaller and their length being 10-15 times shorter. Based on heat diffusion equation, we demonstrate that more efficient cooling of a lava flow in water leads to the rapid development of thicker (by 25%) cooled layer at the flow surface, which has greater yield strength to counteract its internal hydrostatic pressure than in subaerial environments, thus limiting lava breakouts to form new lobes, hence promoting inflation. Buoyancy also increases the ability of a lava to inflate by 60%. Together, these differences can account for the observed variations in the thickness and extent of subaerial and subaqueous inflated lava flows. Article in Journal/Newspaper Iceland Institut national des sciences de l'Univers: HAL-INSU Galapagos Pacific Geochemistry, Geophysics, Geosystems 15 6 2128 2150 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
tumulus eruption cooling Pahoehoe East Pacific rise inflation [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
tumulus eruption cooling Pahoehoe East Pacific rise inflation [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology [SDE.MCG]Environmental Sciences/Global Changes Deschamps, Anne Grigné, Cécile Le Saout, Morgane Soule, Samuel Adam Allemand, Pascal van Vliet-Lanoë, Brigitte Floc'H, France Morphology and dynamics of inflated subaqueous basaltic lava flows |
topic_facet |
tumulus eruption cooling Pahoehoe East Pacific rise inflation [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience During eruptions onto low slopes, basaltic Pahoehoe lava can form thin lobes that progressively coalesce and inflate to many times their original thickness, due to a steady injection of magma beneath brittle and viscoelastic layers of cooled lava that develop sufficient strength to retain the flow. Inflated lava flows forming tumuli and pressure ridges have been reported in different kinds of environments, such as at contemporary subaerial Hawaiian-type volcanoes in Hawaii, La Réunion and Iceland, in continental environments (states of Oregon, Idaho, Washington), and in the deep sea at Juan de Fuca Ridge, the Galapagos spreading center, and at the East Pacific Rise (this study). These lava have all undergone inflation processes, yet they display highly contrasting morphologies that correlate with their depositional environment, the most striking difference being the presence of water. Lava that have inflated in subaerial environments display inflation structures with morphologies that significantly differ from subaqueous lava emplaced in the deep sea, lakes, and rivers. Their height is 2-3 times smaller and their length being 10-15 times shorter. Based on heat diffusion equation, we demonstrate that more efficient cooling of a lava flow in water leads to the rapid development of thicker (by 25%) cooled layer at the flow surface, which has greater yield strength to counteract its internal hydrostatic pressure than in subaerial environments, thus limiting lava breakouts to form new lobes, hence promoting inflation. Buoyancy also increases the ability of a lava to inflate by 60%. Together, these differences can account for the observed variations in the thickness and extent of subaerial and subaqueous inflated lava flows. |
author2 |
Domaines Océaniques (LDO) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Observatoire des Sciences de l'Univers-Institut d'écologie et environnement-Centre National de la Recherche Scientifique (CNRS) Department of Geology and Geophysics Woods Hole Woods Hole Oceanographic Institution (WHOI) Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE) École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Deschamps, Anne Grigné, Cécile Le Saout, Morgane Soule, Samuel Adam Allemand, Pascal van Vliet-Lanoë, Brigitte Floc'H, France |
author_facet |
Deschamps, Anne Grigné, Cécile Le Saout, Morgane Soule, Samuel Adam Allemand, Pascal van Vliet-Lanoë, Brigitte Floc'H, France |
author_sort |
Deschamps, Anne |
title |
Morphology and dynamics of inflated subaqueous basaltic lava flows |
title_short |
Morphology and dynamics of inflated subaqueous basaltic lava flows |
title_full |
Morphology and dynamics of inflated subaqueous basaltic lava flows |
title_fullStr |
Morphology and dynamics of inflated subaqueous basaltic lava flows |
title_full_unstemmed |
Morphology and dynamics of inflated subaqueous basaltic lava flows |
title_sort |
morphology and dynamics of inflated subaqueous basaltic lava flows |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal-insu.archives-ouvertes.fr/insu-01003996 https://hal-insu.archives-ouvertes.fr/insu-01003996/document https://hal-insu.archives-ouvertes.fr/insu-01003996/file/ggge.deschamps.pdf https://doi.org/10.1002/2014GC005274 |
geographic |
Galapagos Pacific |
geographic_facet |
Galapagos Pacific |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal-insu.archives-ouvertes.fr/insu-01003996 Geochemistry, Geophysics, Geosystems, 2014, 15 (6), pp.2128-2150. ⟨10.1002/2014GC005274⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2014GC005274 insu-01003996 https://hal-insu.archives-ouvertes.fr/insu-01003996 https://hal-insu.archives-ouvertes.fr/insu-01003996/document https://hal-insu.archives-ouvertes.fr/insu-01003996/file/ggge.deschamps.pdf doi:10.1002/2014GC005274 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2014GC005274 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
15 |
container_issue |
6 |
container_start_page |
2128 |
op_container_end_page |
2150 |
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1769006968457920512 |