Berthod C., Komorowski J.C., Gurioli L., Médard E., Bachèlery P., Besson P., Verdurme P., Chevrel Magdalena Oryaelle, Di Muro A., Peltier A., Devidal J.L., Nowak S., Thinon I., Burckel P., Hidalgo S., Deplus C., Loubrieu B., Pierre D., Bermell S., Pitel-Roudat M., Réaud Y., Fouchard S., Bickert M., Le Friant A., Paquet F., Feuillet N., Jorry S.L., Fouquet Y., Rinnert E., Cathalot C., Lebas E. (2023). Temporal magmatic evolution of the Fani Maoré submarine eruption 50 km east of Mayotte revealed by in situ sampling and petrological monitoring. Comptes Rendus Géoscience, 354 (S2), 195-223. ISSN 1631-0713.
Titre du document
Temporal magmatic evolution of the Fani Maoré submarine eruption 50 km east of Mayotte revealed by in situ sampling and petrological monitoring
Année de publication
2023
Auteurs
Berthod C., Komorowski J.C., Gurioli L., Médard E., Bachèlery P., Besson P., Verdurme P., Chevrel Magdalena Oryaelle, Di Muro A., Peltier A., Devidal J.L., Nowak S., Thinon I., Burckel P., Hidalgo S., Deplus C., Loubrieu B., Pierre D., Bermell S., Pitel-Roudat M., Réaud Y., Fouchard S., Bickert M., Le Friant A., Paquet F., Feuillet N., Jorry S.L., Fouquet Y., Rinnert E., Cathalot C., Lebas E.
Source
Comptes Rendus Géoscience, 2023,
354 (S2), 195-223 ISSN 1631-0713
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.
Plan de classement
Géologie et formations superficielles [064]
Localisation
Fonds IRD [F B010088394]
Identifiant IRD
fdi:010088394
