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Étude de l'évolution volcano-structurale et magmatique de Mayotte, Archipel des Comores, océan Indien : approches structurale, pétrographique, géochimique et géochronologique

Abstract : Multi-disciplinary approach in Mayotte island allow to identify two volcanic systems : the South volcano is composed of strong undersaturated lavas forming a continuous series of the post-erosional phase. The "Septentrional" volcano is made up of less undersaturated lavas - which can be induced by a stronger melting degree - which form the shield building phase and post-erosional phase. Strontium and Neodymium isotopic ratios and traces elements studies revel incoherence in the evolution of the volcano in the classic hot-spot model hypothesis (Hawaii). The multikilometer scale extension identified in the North of the island could induce melting by decompression during the lithosphere thinning and explain the strong melting degree of the recent lavas of the North-East. The last ones are characterised by isotopic signature of oceanic lithosphere.
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Submitted on : Wednesday, November 30, 2011 - 7:34:24 AM
Last modification on : Monday, April 6, 2020 - 2:44:49 PM
Long-term archiving on: : Thursday, March 1, 2012 - 2:26:33 AM

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  • HAL Id : tel-00646477, version 1

Citation

Delphine Debeuf. Étude de l'évolution volcano-structurale et magmatique de Mayotte, Archipel des Comores, océan Indien : approches structurale, pétrographique, géochimique et géochronologique. Volcanologie. Université de la Réunion, 2009. Français. ⟨NNT : 2004lare0019⟩. ⟨tel-00646477⟩

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