Origine des fractionnements isotopiques de l'azote et des gaz rares dans les météorites et les atmosphères planétaires

Abstract : Nitrogen and noble gases present in asteroids, comets or planetary atmospheres are trapped in organic matter and bear a composition that is different from the composition of the Sun, which is representative of the primordial gas from which the different objects in the solar system were formed 4.5 billion years ago. During this thesis, experimental syntheses of organic matter from gas mixtures in a plasma setup called the Nebulotron were performed in order to better understand the processes responsible for this chemical difference between the meteorites and the Sun for nitrogen and noble gases. The characteristics of the organic matter and the signature of the noble gases trapped in meteorites are relatively well reproduced in the experiments, whereas the composition of nitrogen is not. These experimental results give hints about the key mechanisms that are responsible for the variations of the volatile elements composition in the solar system objects.
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Maïa Kuga. Origine des fractionnements isotopiques de l'azote et des gaz rares dans les météorites et les atmosphères planétaires. Sciences de la Terre. Université de Lorraine, 2014. Français. ⟨NNT : 2014LORR0087⟩. ⟨tel-01750810⟩

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