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<dc:title xml:lang="fr">Caractériser l’héritage mantellique et les processus magmatiques associés dans une marge passive pauvre en magma : exemple du sud de l’Altantique Nord</dc:title>
<dcterms:alternative xml:lang="en">Characterizing the mantle inheritance and associated magmatic processes in a magma-poor passive margin : example from the southern North Atlantic</dcterms:alternative>
<dc:subject xml:lang="fr">Marge passive pauvre en magma</dc:subject>
<dc:subject xml:lang="fr">Héritage</dc:subject>
<dc:subject xml:lang="fr">Manteau sous-continental</dc:subject>
<dc:subject xml:lang="fr">Fusion partielle</dc:subject>
<dc:subject xml:lang="fr">Interactions magma-manteau</dc:subject>
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<dc:subject xml:lang="en">Magma-poor passive margin</dc:subject>
<dc:subject xml:lang="en">Inheritance</dc:subject>
<dc:subject xml:lang="en">Subcontinental mantle</dc:subject>
<dc:subject xml:lang="en">Partial melting</dc:subject>
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<dcterms:abstract xml:lang="fr">Cette thèse caractérise le manteau sous-continental (SCLM) le long des marges passives pauvres en magma du sud de l’Atlantique Nord. Les péridotites étudiées montrent un manteau hétérogène, avec un héritage ancien et des modifications syn- et post-rift. Les analyses géochimiques et isotopiques (Hf-Nd) permettent de distinguer plusieurs réservoirs mantelliques, identifier des épisodes récents et anciens de fusion partielle et d’interaction magma-manteau. L’ensemble de ces informations indique que la transition continent-océan est progressive, résultante de la surimposition d’héritage pré-rift, d’enrichissement/appauvrissement post-rift et d’interactions localisées avec des magmas intraplaques post-rift. Ces résultats mettent en avant le rôle du manteau lithosphérique sous-continental dans la formation et l’évolution d’une marge passive pauvre en magma, mais aussi comment celui-ci est transformé par les processus magmatiques liés à la mise en place de cette marge.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This thesis characterizes the subcontinental mantle (SCLM) along the magma-poor passive rifted margins of the southern North Atlantic. The peridotites studied show a heterogeneous mantle, with an ancient inheritance and syn- and post-rift modifications. Geochemical and isotopic (Hf-Nd) analyses allow us to distinguish several mantle reservoirs and identify recent and ancient episodes of partial melting and mantle-melt interaction. All of this information indicates that the ocean-continent transition is gradual, resulting from the superimposition of pre-rift inheritance, post-rift enrichment/depletion, and localized interactions with post-rift intraplate magmas. These results highlight the role of the subcontinental lithospheric mantle in the formation and evolution of a magma-poor passive margin, but also how it is transformed by magmatic processes linked to the establishment of this margin.</dcterms:abstract>
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