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Berthod, Carole; Komorowski, Jean-Christophe; Gurioli, Lucia; Médard, Etienne; Bachèlery, Patrick; Besson, Pascale; Verdurme, Pauline; Chevrel, Oryaëlle; Di Muro, Andrea; Peltier, Aline; Devidal, Jean-Luc; Nowak, Sophie; Thinon, Isabelle; Burckel, Pierre; Hidalgo, Samia; Deplus, Christine; Loubrieu, Benoît; Pierre, Delphine; Bermell, Sylvain; Pitel-Roudaut, Mathilde; Réaud, Yvan; Fouchard, Sacha; Bickert, Manon; Le Friant, Anne; Paquet, Fabien; Feuillet, Nathalie; Jorry, Stephan L.; Fouquet, Yves; Rinnert, Emmanuel; Cathalot, Cécile; Lebas, Elodie
Comptes rendus. Geoscience, 2022, Letnik: 354, Številka: S2Journal Article
The “Fani Maoré” eruption off the coasts of Mayotte has been intensively monitored by applying methods similar to those used for subaerial eruptions. Repeated high-resolution bathymetric surveys and dredging, coupled with petrological analyses of time-constrained samples, allowed tracking the evolution of magma over the whole submarine eruptive sequence. Indeed, after one year of direct ascent (Phase 1), basanitic magma switched to a different pathway that sampled a tephri-phonolitic subcrustal reservoir (Phase 2). Later, the magma pathway shifted again in the crust resulting in a new eruption site located 6 km northwest of the main edifice (Phase 3). The petrological signature of lava flows reveals both an evolution by fractional crystallization and syn-eruptive mixing with a tephri-phonolitic magma. We demonstrate that high-flux eruption of large volumes of basanitic magma from a deep-seated reservoir can interact with shallower reservoirs and remobilize eruptible magma. This has significant hazards implications with respect to the capacity of such large eruptions to reactivate shallow-seated inactive reservoirs from a transcrustal magmatic system that could be located potentially at a distance from the high-flux eruptive site.
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