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<dc:title xml:lang="fr">Les mécanismes de différenciation magmatique de la croûte continentale : les systèmes magmatiques permiens d'Europe de l'Ouest</dc:title>
<dcterms:alternative xml:lang="en">Magmatic differentiation mechanisms of the continental crust : the permian magmatic systems of Western Europe</dcterms:alternative>
<dc:subject xml:lang="fr">Différenciation</dc:subject>
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<dc:subject xml:lang="fr">Hybridation</dc:subject>
<dc:subject xml:lang="en">Differentiation</dc:subject>
<dc:subject xml:lang="en">Fractional crystallization</dc:subject>
<dc:subject xml:lang="en">Crustal assimilation</dc:subject>
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<dcterms:abstract xml:lang="fr">L’objectif de cette thèse vise à contraindre le rôle du magmatisme sur la diversité en composition et sur la modification de l’architecture de la croûte continentale. Cette étude se focalise sur l’intrusion du complexe gabbroïque de Sondalo (Italie du Nord), mis en place en croûte moyenne dans un contexte post-orogénique. Par des études pétrologiques, géochimiques et isotopiques ainsi que les modélisations thermodynamiques, géochimiques et isotopiques nous montrons que la majeure partie de la différenciation magmatique du complexe suit la différenciation des magmas tholéiitiques en croûte moyenne et qu’elle s’est produite à partir d’une combinaison de cristallisation fractionnée, d’assimilation crustale et d’hybridation des magmas. Ces mécanismes influencent fortement la composition en éléments majeurs, les séquences de cristallisation, les proportions de phases et influencent fortement l’évolution des liquides magmatiques plus différenciés dans les niveaux crustaux plus superficiels.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The aim of this thesis is to constrain the role of magmatism in compositional diversity and in modifying the architecture of continental crust. This study focuses on a mid-crustal intrusion, the Sondalo gabbroic complex (Northern Italy) emplaced in a post-orogenic context. By petrological, geochemical and isotopic evidences as well as thermodynamic, geochemical and isotopic modelling, we show that: most magmatic differentiation of the complex follows the one of tholeiitic magmas in the middle crust and this magmatic differentiation is produced from a combination of fractional crystallization, crustal assimilation and magma hybridization. These mechanisms strongly influence the major element composition, crystallization sequences and phase proportions and have a strong influence on the evolution of the more differentiated magmatic liquids in the shallower crustal levels.</dcterms:abstract>
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