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Le cycle de l'eau dans le manteau terrestre: apport de la modelisation numerique

Abstract : Water is probably present everywhere in the Earth's mantle today. The effects due to its presence in the mantle are numerous. The large scale water distribution question is tackled by using numerical models. Mantle convection mixing is shown to avoid water diffusing to high water-solubility zones. It implies a fluid phase rise in the low solubility zone, the lower mantle. The fluid phase can migrate by percolation and concentrates water at the top of the lower mantle (660 km depth) despite the convective downward flow. Contrary to hydrogen diffusion, the percolation process seems to be able to concentrate water in the Earth's mantle. A water reservoir would form at the upper edge of the lower mantle in the spinel-postspinel phase transition near the subduction zone.
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https://tel.archives-ouvertes.fr/tel-00005286
Contributor : Guillaume Richard <>
Submitted on : Wednesday, March 10, 2004 - 5:26:53 PM
Last modification on : Thursday, October 15, 2020 - 4:06:51 AM
Long-term archiving on: : Friday, April 2, 2010 - 7:58:18 PM

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  • HAL Id : tel-00005286, version 1

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Guillaume Richard. Le cycle de l'eau dans le manteau terrestre: apport de la modelisation numerique. Géophysique [physics.geo-ph]. Université Paul Sabatier - Toulouse III, 2003. Français. ⟨tel-00005286⟩

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