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Approche expérimentale de la cristallisation dans les chambres magmatiques et étude d'intrusions litées (massif gabbroïque du Skaergaard, Groenland et pluton granitique de Dolbel, Niger)

Abstract : Crystallization of magmatic liquids in plutonic environments is considered from an experimental point of view, through the study of Crystal Size Distribution (CSD), and from the petrological study of two layered intrusions: a mafic complex (Skaergaard, Greenland) and a granitic pluton (Dolbel, Niger). The evolution of plagioclase textures during controlled cooling of a basaltic liquid shows that the CSD cannot be simply used to reconstitute the thermal history. Textural and chemical studies of minerals from layered rocks (plagioclases of the Lower Zone of Skaergaard, amphibole and feldspars of the Dolbel pluton) show the importance of interaction between petrological and mechanical process. In the Skaergaard, convection, magmatic sedimentation and crystallization are inferred to be the dominant factors. In the Dolbel pluton, the successive stages of crystallization result from the interaction between fractional crystallization and deformation.
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Elsa Pupier. Approche expérimentale de la cristallisation dans les chambres magmatiques et étude d'intrusions litées (massif gabbroïque du Skaergaard, Groenland et pluton granitique de Dolbel, Niger). Sciences de la Terre. Université Henri Poincaré - Nancy 1, 2006. Français. ⟨NNT : 2006NAN10005⟩. ⟨tel-01748067⟩

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