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Theses

Modélisation thermomécanique et transferts de fluides dans les zones de subduction

Abstract : Volcanism in subduction zones is associated to lithospheric plate dehydration. The presence of water allows pulling down partial melting conditions.

A bi-dimensional finite element model has been developed in order to study the influence of subduction zone geometrical parameters on partial melting. This model incorporates classical fluid mechanics equations and the simultaneous computation of partial melting and water transfers between minerals in the mantle and crust. In the technical part, energy conservation equation is solved using a Galerkin procedure while mass and momentum
equations are solved by a penalty method. Fluid transfers are incorporated with a tracer cell method. Each tracer includes compositional and water content information. The released water content which takes part in partial melting is computed from the temperature and pressure conditions resulting from the thermo-mechanical model.

The results are in line with geochemical data recorded in lavas from volcanic arcs. Thereby, an increasing overriding crustal thickness is related to a decreasing magmatic production, while convergent rate acceleration is correlated with an increasing partial melting rate.
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Theses
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https://tel.archives-ouvertes.fr/tel-00391008
Contributor : Pierre-André Arrial <>
Submitted on : Wednesday, June 3, 2009 - 11:09:09 AM
Last modification on : Wednesday, June 17, 2020 - 6:29:18 PM
Long-term archiving on: : Saturday, November 26, 2016 - 9:48:06 AM

Identifiers

  • HAL Id : tel-00391008, version 1

Citation

Pierre-André Arrial. Modélisation thermomécanique et transferts de fluides dans les zones de subduction. Sciences de la Terre. Université de Nantes, 2009. Français. ⟨tel-00391008⟩

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