FN Archimer Export Format
PT J
TI The 2018-ongoing Mayotte submarine eruption: Magma migration imaged by petrological monitoring
BT 
AF Berthod, Carole
   Médard, Etienne
   Bachèlery, Patrick
   Gurioli, Lucia
   Di Muro, Andrea
   Peltier, Aline
   Komorowski, Jean-Christophe
   Benbakkar, Mhammed
   Devidal, Jean-Luc
   Langlade, Jessica
   Besson, Pascale
   Boudon, Georges
   Rose-Koga, Estelle
   Deplus, Christine
   Le Friant, Anne
   BICKERT, Manon
   Nowak, Sophie
   Thinon, Isabelle
   Burckel, Pierre
   Hidalgo, Samia
   Kaliwoda, Melanie
   Jorry, Stephan
   Fouquet, Yves
   Feuillet, Nathalie
AS 1:1;2:1;3:1;4:1;5:2,3;6:2,3;7:3;8:1;9:1;10:4;11:3;12:3;13:1;14:3;15:3;16:3;17:3;18:5;19:3;20:3;21:6;22:7;23:7;24:3;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;14:;15:;16:;17:;18:;19:;20:;21:;22:PDG-REM-GM-LGS;23:PDG-REM-GM-LCG;24:;
C1 Université Clermont-Auvergne, CNRS, IRD, OPGC, Laboratoire Magmas et Volcans, 6 avenue Blaise Pascal, 63178 Aubière, France
   Observatoire Volcanologique du Piton de la Fournaise, Institut de physique du globe de Paris, F-97418 La Plaine des Cafres, France
   Université de Paris, Institut de physique du globe de Paris, CNRS, F-75005 Paris, France
   CNRS, Ifremer c/Brest, F-29280 Plouzané, France
   BRGM-French geological survey, 3 avenue Claude Guillemin, BP36009, F-45060 Orléans, Cédex 2, France
   Ludwig-Maximilians-Universität München, Theresienstrasse 41, D-80333 München, Germany
   Ifremer, GM, F-29280 Plouzané, France
C2 UNIV CLERMONT-AUVERGNE, FRANCE
   IPGP, FRANCE
   UNIV PARIS, FRANCE
   CNRS, FRANCE
   BRGM, FRANCE
   UNIV MUNICH, GERMANY
   IFREMER, FRANCE
SI BREST
SE PDG-REM-GM-LGS
   PDG-REM-GM-LCG
IN WOS Ifremer UPR
   copubli-france
   copubli-p187
   copubli-europe
   copubli-univ-france
IF 5.785
TC 34
UR https://archimer.ifremer.fr/doc/00711/82273/88208.pdf
LA English
DT Article
CR MAYOBS1
   MAYOBS2
   MAYOBS4
BO Marion Dufresne
DE ;Mayotte;submarine eruption;dredges;petrological model;mantle reservoirs;multiple storage zone
AB Deep-sea submarine eruptions are the least known type of volcanic activity, due to the difficulty of detecting, monitoring, and sampling them. Following an intense seismic crisis in May 2018, a large submarine effusive eruption offshore the island of Mayotte (Indian Ocean) has extruded at least 6.5 km3 of magma to date, making it the largest monitored submarine eruption as well as the largest effusive eruption on Earth since Iceland's 1783 Laki eruption. This volcano is located along a WNW-ESE volcanic ridge, extending from the island of Petite Terre (east side of Mayotte) to about 3,500 m of water depth. We present a detailed petrological and geochemical description of the erupted lavas sampled by the MAYOBS 1, 2, and 4 cruises between May and July 2019 and use these to infer characteristics and changes through time for the whole magmatic system and its dynamics from the source to the surface. These cruises provide an exceptional time-series of bathymetric, textural, petrological, and geochemical data for the 2018-2019 eruptive period, and hence bring an invaluable opportunity to better constrain the evolution of magma storage and transfer processes during a long-lived submarine eruption. Integrating the petrological signatures of dredged lavas with geophysical data, we show that the crystal-poor and gas-rich evolved basanitic magma was stored at mantle depth (>37 km) in a large (≥10 km3) reservoir and that the eruption was tectonically triggered. As the eruption proceeded, a decrease in ascent rate and/or a pathway change resulted in the incorporation of preexisting differentiated magma stored at a shallower level. Magma transfer from the deep mantle reservoir is syn-eruptive, as indicated by transfer times estimated from diffusion in zoned olivine crystals that are much shorter than the total eruption duration. Our petrological model has important hazard implications concerning the rapid and stealthy awakening of a deep gas-rich magma reservoirs that can produce unusually high output rates and long-lived eruption. Sudden tapping of large crystal poor reservoirs may be the trigger mechanism for other rarely witnessed high-volume (>1 km3) effusive events. 
PY 2021
PD OCT
SO Earth And Planetary Science Letters
SN 0012-821X
PU Elsevier BV
VL 571
UT 000684176000001
DI 10.1016/j.epsl.2021.117085
ID 82273
ER

EF