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Origine, évolution et mise en place d’un pluton récent en contexte intraplaque océanique. Exemple du complexe sud de Rallier du Baty, Kerguelen (T.A.A.F.)

Abstract : The study of this alkaline plutonic complex was multidisciplinary, mixing field observations and measurements, AMS, petrography, mineralogy, geochemistry (major and traces), isotopic geochemistry Rb / Sr and Sm / Nd and geochronology U-Pb on zircons. The synthesis of the results shows the minor participation of several sources (metasomatised mantle and continental fragments) in addition to the predominant source which is the typical asthenospheric mantle of the Kerguelen plume. In a dynamic and open magmatic system, the contaminated magmas formed the oldest magmatic and calcic series of the complex. The second and younger magmatic series produced (in a closed environment) more and more agpaitic rocks during differentiation. The incremental emplacement of the intrusions occurred between 11.7 (in the south) and 7.9 Ma (in the north). Finally, the type of construction of this pluton makes it a unique known example of laccolith in oceanic within-plate settings.
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Leandre Ponthus. Origine, évolution et mise en place d’un pluton récent en contexte intraplaque océanique. Exemple du complexe sud de Rallier du Baty, Kerguelen (T.A.A.F.). Sciences de la Terre. Université Toulouse 3 Paul Sabatier (UT3 Paul Sabatier), 2018. Français. ⟨tel-01817935⟩

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