Magma interactions, crystal mush formation, and unrest during caldera collapse and lateral eruption at ocean island basaltic volcanoes (Piton de la Fournaise, La Réunion)
The dynamics of magmatic processes at large mafic ocean island volcanoes control the likely locations (central caldera versus flanks) and timing of their eruptions. Crystals and their melt inclusions are key witnesses of these processes but are rarely studied in detail and in the same samples. Here...
| Autores: | , , , , , |
|---|---|
| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2019 |
| País: | España |
| Recursos: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repositorio: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:2445/226519 |
| Acesso em linha: | https://hdl.handle.net/2445/226519 |
| Access Level: | acceso abierto |
| Palavra-chave: | Magmatisme Vulcanisme Petrologia Roques ígnies Geoquímica Volcans Magmatism Volcanism Petrology Igneous rocks Geochemistry Volcanoes |
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Magma interactions, crystal mush formation, and unrest during caldera collapse and lateral eruption at ocean island basaltic volcanoes (Piton de la Fournaise, La Réunion)Albert Mínguez, HelenaCosta F.Di Muro, A.Herrin, J.Métrich, N.Deloule, E.MagmatismeVulcanismePetrologiaRoques ígniesGeoquímicaVolcansMagmatismVolcanismPetrologyIgneous rocksGeochemistryVolcanoesThe dynamics of magmatic processes at large mafic ocean island volcanoes control the likely locations (central caldera versus flanks) and timing of their eruptions. Crystals and their melt inclusions are key witnesses of these processes but are rarely studied in detail and in the same samples. Here we report the crystal and melt inclusion compositions of the April 2007 caldera-forming eruption of Piton de la Fournaise volcano and discuss how they relate to geophysical unrest monitoring data. Olivine crystals show mainly normal zoning (decrease in Mg/Fe) towards the rims, and also around some melt inclusions. Many crystals also show fine-scale skeletal structures defined by high phosphorus concentrations. Melt inclusions contain 53–205 ppm CO2and 0.25–1.1 wt% H2O, and δD (δD values expressed as δDVSMOW) ranges from −135 to 62. Monitoring data show that inflation of the edifice started about a month before the first 2007 eruption: magma intrusion occurred at ≈3 km below sea level, and quickly migrated towards shallower depths (about 1 km above sea level). Such a time frame of magma movement is recorded in the chemical zoning of the olivine crystals that massively and quickly crystallized when reaching shallow depth, without significant interactions between resident and intruding magmas. The intrusion was followed by lateral flank eruption and caldera collapse. The chemical zoning of the olivine crystal rims and around the melt inclusions indicates that the newly created crystal-mush moved laterally towards the surface in matter of days to 3 months. Post-caldera samples show significant H+loss, likely due to the depressurization of the magmatic system stored at shallow level. Our findings are different from other mafic ocean island volcanoes or stratovolcanoes (e.g. Kilauea, Canary Islands, and Etna), where crystals commonly record magma mixing between evolved and shallow melts and intruding mafic melts. We speculate that the difference between our findings and those of similar mafic ocean island volcanoes is due to the variety of magma supply rates from depth.Elsevier B.V.2026202620192026info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion13 p.application/pdfhttps://hdl.handle.net/2445/226519Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció del document publicat a: https://doi.org/10.1016/j.epsl.2019.02.035Earth and Planetary Science Letters, 2019, vol. 515, p. 187-199https://doi.org/10.1016/j.epsl.2019.02.035cc-by-nc-nd (c) Albert Mínguez, Helena et al., 2019http://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:recercat.cat:2445/2265192026-05-29T05:05:01Z |
| dc.title.none.fl_str_mv |
Magma interactions, crystal mush formation, and unrest during caldera collapse and lateral eruption at ocean island basaltic volcanoes (Piton de la Fournaise, La Réunion) |
| title |
Magma interactions, crystal mush formation, and unrest during caldera collapse and lateral eruption at ocean island basaltic volcanoes (Piton de la Fournaise, La Réunion) |
| spellingShingle |
Magma interactions, crystal mush formation, and unrest during caldera collapse and lateral eruption at ocean island basaltic volcanoes (Piton de la Fournaise, La Réunion) Albert Mínguez, Helena Magmatisme Vulcanisme Petrologia Roques ígnies Geoquímica Volcans Magmatism Volcanism Petrology Igneous rocks Geochemistry Volcanoes |
| title_short |
Magma interactions, crystal mush formation, and unrest during caldera collapse and lateral eruption at ocean island basaltic volcanoes (Piton de la Fournaise, La Réunion) |
| title_full |
Magma interactions, crystal mush formation, and unrest during caldera collapse and lateral eruption at ocean island basaltic volcanoes (Piton de la Fournaise, La Réunion) |
| title_fullStr |
Magma interactions, crystal mush formation, and unrest during caldera collapse and lateral eruption at ocean island basaltic volcanoes (Piton de la Fournaise, La Réunion) |
| title_full_unstemmed |
Magma interactions, crystal mush formation, and unrest during caldera collapse and lateral eruption at ocean island basaltic volcanoes (Piton de la Fournaise, La Réunion) |
| title_sort |
Magma interactions, crystal mush formation, and unrest during caldera collapse and lateral eruption at ocean island basaltic volcanoes (Piton de la Fournaise, La Réunion) |
| dc.creator.none.fl_str_mv |
Albert Mínguez, Helena Costa F. Di Muro, A. Herrin, J. Métrich, N. Deloule, E. |
| author |
Albert Mínguez, Helena |
| author_facet |
Albert Mínguez, Helena Costa F. Di Muro, A. Herrin, J. Métrich, N. Deloule, E. |
| author_role |
author |
| author2 |
Costa F. Di Muro, A. Herrin, J. Métrich, N. Deloule, E. |
| author2_role |
author author author author author |
| dc.subject.none.fl_str_mv |
Magmatisme Vulcanisme Petrologia Roques ígnies Geoquímica Volcans Magmatism Volcanism Petrology Igneous rocks Geochemistry Volcanoes |
| topic |
Magmatisme Vulcanisme Petrologia Roques ígnies Geoquímica Volcans Magmatism Volcanism Petrology Igneous rocks Geochemistry Volcanoes |
| description |
The dynamics of magmatic processes at large mafic ocean island volcanoes control the likely locations (central caldera versus flanks) and timing of their eruptions. Crystals and their melt inclusions are key witnesses of these processes but are rarely studied in detail and in the same samples. Here we report the crystal and melt inclusion compositions of the April 2007 caldera-forming eruption of Piton de la Fournaise volcano and discuss how they relate to geophysical unrest monitoring data. Olivine crystals show mainly normal zoning (decrease in Mg/Fe) towards the rims, and also around some melt inclusions. Many crystals also show fine-scale skeletal structures defined by high phosphorus concentrations. Melt inclusions contain 53–205 ppm CO2and 0.25–1.1 wt% H2O, and δD (δD values expressed as δDVSMOW) ranges from −135 to 62. Monitoring data show that inflation of the edifice started about a month before the first 2007 eruption: magma intrusion occurred at ≈3 km below sea level, and quickly migrated towards shallower depths (about 1 km above sea level). Such a time frame of magma movement is recorded in the chemical zoning of the olivine crystals that massively and quickly crystallized when reaching shallow depth, without significant interactions between resident and intruding magmas. The intrusion was followed by lateral flank eruption and caldera collapse. The chemical zoning of the olivine crystal rims and around the melt inclusions indicates that the newly created crystal-mush moved laterally towards the surface in matter of days to 3 months. Post-caldera samples show significant H+loss, likely due to the depressurization of the magmatic system stored at shallow level. Our findings are different from other mafic ocean island volcanoes or stratovolcanoes (e.g. Kilauea, Canary Islands, and Etna), where crystals commonly record magma mixing between evolved and shallow melts and intruding mafic melts. We speculate that the difference between our findings and those of similar mafic ocean island volcanoes is due to the variety of magma supply rates from depth. |
| publishDate |
2019 |
| dc.date.none.fl_str_mv |
2019 2026 2026 2026 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
| format |
article |
| status_str |
publishedVersion |
| dc.identifier.none.fl_str_mv |
https://hdl.handle.net/2445/226519 |
| url |
https://hdl.handle.net/2445/226519 |
| dc.language.none.fl_str_mv |
Inglés |
| language_invalid_str_mv |
Inglés |
| dc.relation.none.fl_str_mv |
Reproducció del document publicat a: https://doi.org/10.1016/j.epsl.2019.02.035 Earth and Planetary Science Letters, 2019, vol. 515, p. 187-199 https://doi.org/10.1016/j.epsl.2019.02.035 |
| dc.rights.none.fl_str_mv |
cc-by-nc-nd (c) Albert Mínguez, Helena et al., 2019 http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
| rights_invalid_str_mv |
cc-by-nc-nd (c) Albert Mínguez, Helena et al., 2019 http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| eu_rights_str_mv |
openAccess |
| dc.format.none.fl_str_mv |
13 p. application/pdf |
| dc.publisher.none.fl_str_mv |
Elsevier B.V. |
| publisher.none.fl_str_mv |
Elsevier B.V. |
| dc.source.none.fl_str_mv |
Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada) reponame:Recercat. Dipósit de la Recerca de Catalunya instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
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Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
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Recercat. Dipósit de la Recerca de Catalunya |
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Recercat. Dipósit de la Recerca de Catalunya |
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