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Phases of Magmatism and Tectonics Along the Madagascar‐Comoros Volcanic Chain, and Synchronous Changes in the Kinematics of the Lwandle and Somalia Plates

dc.rights.licenseopenen_US
dc.contributor.authorRUSQUET, Anaïs
dc.contributor.authorFAMIN, Vincent
dc.contributor.authorMICHON, Laurent
dc.contributor.authorQUIDELLEUR, Xavier
dc.contributor.authorNAURET, François
dc.contributor.authorDANIŠÍK, Martin
dc.contributor.authorRUFFET, Gilles
dc.contributor.authorBERTHOD, Carole
dc.contributor.authorREVILLON, Sidonie
dc.contributor.authorBACHÈLERY, Patrick
dc.contributor.authorTHINON, Isabelle
dc.contributor.authorLEMOINE, Anne
dc.contributor.authorLEROY, Sylvie
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorZARAGOSI, Sebastien
dc.contributor.authorTHIVET, Simon
dc.contributor.authorBERNARD, Julien
dc.contributor.authorGOURBET, Loraine
dc.contributor.authorMÉDARD, Etienne
dc.contributor.authorTOULIER, Alix
dc.date.accessioned2025-01-07T08:59:11Z
dc.date.available2025-01-07T08:59:11Z
dc.date.issued2025-01
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/204162
dc.description.abstractEnThis paper aims to solve the longstanding debate on the origin of the Comoros volcanic archipelago (Mozambique Channel, Indian Ocean) concerning whether it represents a hotspot trail or a boundary between the Lwandle and Somalia plates in possible connection with the East African Rift System (EARS). To achieve this goal, we analyzed rock samples from recently discovered and previously uninvestigated volcanoes and edifices by means of geochemistry and geochronology. Major-trace element analyses and radiometric dating (40Ar/39Ar, K-Ar, and (U-Th)/He) allow us to identify a widespread phase of Comorian volcanism initiated at 9–8 Ma, involving the Zélée, Geyser, and Leven banks, three atolls east of the Comoros. Another tectono-magmatic phase initiated at 2.5 Ma led to a N-S widening of seamount volcanism, and to the progressive development of en-échelon NW-SE structures. With this new addition of atolls and seamounts, the Comoros Archipelago becomes a ∼700 km-long, ∼200 km-wide E-W chain extending from the Cenozoic volcanoes of Madagascar to the EARS. The reactivation of this chain at 9–8 and 2.5 Ma coincides with abrupt changes in the motion of the Somalia plate relative to the Lwandle plate, and with plate boundary modifications. The en-échelon reorganization of structures also matches the kinematic evolution of Somalia relative to Lwandle, from transtension (>3 Ma) to pure dextral slip (≤3 Ma) in the northern Mozambique Channel. We conclude that the Madagascar-Comoros volcanic chain is a branch of the EARS and a plate boundary, further strengthening the link between magmatism and the Rovuma-Lwandle-Somalia plate kinematics.
dc.description.sponsorshipCOmores & maYotte : vOlcanisme, TEctonique et Sismicitéen_US
dc.language.isoENen_US
dc.rightsAttribution 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/us/*
dc.titlePhases of Magmatism and Tectonics Along the Madagascar‐Comoros Volcanic Chain, and Synchronous Changes in the Kinematics of the Lwandle and Somalia Plates
dc.typeArticle de revueen_US
dc.identifier.doi10.1029/2024jb029488en_US
dc.subject.halSciences de l'environnementen_US
bordeaux.journalJournal of Geophysical Research: Solid Earthen_US
bordeaux.volume130en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue1en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamGEOLSEDen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcecrossref
hal.identifierhal-04869482
hal.version1
hal.date.transferred2025-01-07T08:59:16Z
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exporttrue
workflow.import.sourcecrossref
dc.rights.ccCC BYen_US
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