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Modélisation 3D de la diffusion atomique dans les minéraux : applications à l'étude des isotopes de l'hydrogène et de l'oxygène, et du couple Al-Si

Abstract : This thesis presents a 3D numerical modelling (finite differences) which can simulate atomic diffusion in single crystals. This new tool allows : to simulate anisotropic diffusion, a large choice of cristal shapes, any initial distribution of concentration, any concentration at surface as a function of time and any temperature change as a function of time.
The 3D modelling has been applied to four cases of study : three of them deal with experimental hydrogen diffusion in diopside, lawsonite and tourmaline, the fourth deals with Al-Si and O natural diffusion profiles in diopsides from Adirondacks. These studies illustrate the power of the 3D modelling developped for the description and the interpretation of diffusion profiles. This new tool will be very useful for the interpretation of detailed zonations at grain scale measured by modern analytical techniques
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Submitted on : Thursday, November 9, 2006 - 11:15:14 AM
Last modification on : Monday, April 5, 2021 - 2:26:09 PM
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Guillaume Desbois. Modélisation 3D de la diffusion atomique dans les minéraux : applications à l'étude des isotopes de l'hydrogène et de l'oxygène, et du couple Al-Si. Minéralogie. Université Paul Sabatier - Toulouse III, 2006. Français. ⟨tel-00112585⟩

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