Time-window into the transcrustal plumbing system dynamics of Dominica (Lesser Antilles)
| Autor: | Daniel J. Morgan, Hélène Balcone-Boissard, Thiebaut d'Augustin, Lea Ostorero, Georges Boudon, Clara Solaro |
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| Přispěvatelé: | Institut de Physique du Globe de Paris (IPGP), Institut national des sciences de l'Univers (INSU - CNRS)-IPG PARIS-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Institut des Sciences de la Terre de Paris (iSTeP), Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Institut national des sciences de l'Univers (INSU - CNRS), IRCAV - Institut de Recherche sur le Cinéma et l'Audiovisuel - EA 185 (IRCAV), LABEX ICCA, Université Paris 13 (UP13)-Université Sorbonne Nouvelle - Paris 3-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Université Sorbonne Paris Nord-Université Paris 13 (UP13)-Université Sorbonne Nouvelle - Paris 3-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Université Sorbonne Paris Nord |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
[PHYS]Physics [physics]
geography Solid Earth sciences Multidisciplinary geography.geographical_feature_category 010504 meteorology & atmospheric sciences Science Natural hazards Geochemistry 010502 geochemistry & geophysics 01 natural sciences Article Volcanic risk Volcano 13. Climate action Time windows Magma Medicine Geology 0105 earth and related environmental sciences |
| Zdroj: | Scientific Reports, Vol 11, Iss 1, Pp 1-15 (2021) Scientific Reports Scientific Reports, Nature Publishing Group, 2021, 11 (1), ⟨10.1038/s41598-021-90831-1⟩ |
| ISSN: | 2045-2322 |
| DOI: | 10.1038/s41598-021-90831-1⟩ |
| Popis: | A transcrustal mush system has been recognized beneath Dominica (Lesser Antilles) with different magma ponding zones that generated a series of pumiceous eruptions from Morne Trois Pitons–Micotrin volcano. Here, the latest, large, pumiceous eruption (Grand Fond - 24 kyrs cal BP) and four, smaller, Plinian eruptions (18-9 kyrs cal BP) are investigated. Pre-eruptive magma dynamics within the mush are unraveled through orthopyroxene phenocrysts by combining a Crystal System Analysis approach (on unzoned and zoned orthopyroxenes) and timescale estimates derived by intracrystalline Fe-Mg interdiffusion modeling. Two magmatic environments are recognized in the mush and have mixed, more or less vigorously, before the successive eruptions. Few interactions between the two magmas began 15-34 years prior to the small Plinian eruptions, but the sustained mixing occurred in the last 2 years. This contrasts with longer timescales (2-80 years) obtained for the larger eruption of Grand Fond with magmas stored deeper. These magma mixing timescales have significant implications for volcanic risk mitigation, with a growing reactivation signal that could be registered at the surface few years prior to the eruptions. |
| Databáze: | OpenAIRE |
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