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Time-window into the transcrustal plumbing system dynamics of Dominica (Lesser Antilles)

Abstract : Dominica, one of the most magmatically active islands of the Lesser Antilles through its four active volcanoes, is likely host under its central part, below Morne Trois Pitons-Micotrin, to a wellestablished transcrustal mush system. Pre-eruptive spatiotemporal magma dynamics are examined for five, explosive, pumiceous eruptions of this volcano in the last 24 kyrs through a combined Crystal System Analysis and intracrystalline Fe-Mg interdiffusion timescales modelling approaches. Before all eruptions, two magmatic environments of close compositions have interacted. These interactions began ~ 10-30 years prior to the four smaller of these eruptions, with more sustained mixing in the last decade, accelerated in the last 2 years. This contrasts with the largest pumiceous eruption, involving deeper magmas, with magma interaction starting over roughly a century but with various patterns. This suggests a possibility that increasing reactivation signals could be registered at the surface some years before future eruptions, having significant implications for volcanic risk mitigation.
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Submitted on : Thursday, June 3, 2021 - 4:10:34 PM
Last modification on : Wednesday, June 30, 2021 - 9:40:15 PM

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Lea Ostorero, Georges Boudon, Hélène Balcone-Boissard, Daniel Morgan, Thiebaut D’augustin, et al.. Time-window into the transcrustal plumbing system dynamics of Dominica (Lesser Antilles). Scientific Reports, Nature Publishing Group, 2021, 11 (1), ⟨10.1038/s41598-021-90831-1⟩. ⟨hal-03248535⟩

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