HR: 0800h
AN: T41C-1317    [Abstracts]
TI: Slab dehydration and fluid migration
AU: MONNEREAU, M
EM: marc.monnereau@cnes.fr
AF: UMR5562-DTP, Observatoire Midi-Pyrenees, 14 Av. E. Belin, Toulouse, 31400 France
AU: * RICHARD, G C
EM: guillaume.richard@yale.edu
AF: Dtp of Geology and Geophysics, Yale University, PO Box 208109, New Haven, CT 06520 United States
AU: Bercovici, D
EM: david.bercovici@yale.edu
AF: Dtp of Geology and Geophysics, Yale University, PO Box 208109, New Haven, CT 06520 United States
AB: Water enters the Earth's mantle at trenches by subduction of oceanic crust. Most of this water immediately returns to the atmosphere through back arc volcanism, but a part of it, retained in Dense Hydrous Magnesium Silicates (DHMSs) and Nominally Anhydrous Minerals (NAMs) like olivine, is expected as deep as the bottom of the upper mantle (660 km depth). Then, due to its low solubility in lower mantle minerals, water is likely to be released as an hydrated fluid, during the spinel-postspinel phase change. The dynamics of this fluid phase is investigated through 1-D and 2-D models of compaction, in which a source term has been introduced to take the fluid precipitation into account.
DE: 1037 Magma genesis and partial melting (3619)
DE: 3060 Subduction zone processes (1031, 3613, 8170, 8413)
DE: 3611 Thermodynamics (0766, 1011, 8411)
DE: 3653 Fluid flow
DE: 4255 Numerical modeling (0545, 0560)
SC: Tectonophysics [T]
MN: Fall Meeting 2005