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L'azote, le néon et le xénon dans le manteau : sources, processus et hétérogénéités

Abstract : This study is devoted for (i) the precise ana)yses of noble gas isotopic compositions in plume-related sample from Kola, Russian and (ii) a detailed study on nitrogen isotopic composition in peridotite xenoliths by stepwisecombustion. High 20Ne/22Ne ratio was observed in one of the sam pies, suggesting the presence of solar nebula during the accretion of the earth and its incorporation in the deep mantle. The ratios of radiogenicnoble gases (4He-21Ne-136Xe) in Kola samples implies that whole mantle region was subject to primitive degassing over 560 Ma. A d15N value as low as -17 [pour mille] was observed for the first time as a bulk composition of terrestrial silicate. ln mantle xenoliths, the N2/Ar ratios were significantly enhanced compared to that of thefluid inclusions. An implication of this observation is that the behaviour of nitrogen and argon in the geochemical processes may occasionally differ.
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Submitted on : Thursday, March 29, 2018 - 12:35:45 PM
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Reika yokochi. L'azote, le néon et le xénon dans le manteau : sources, processus et hétérogénéités. Sciences de la Terre. Institut National Polytechnique de Lorraine, 2005. Français. ⟨NNT : 2005INPL045N⟩. ⟨tel-01750005⟩



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