Physics
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984angeo...2..341v&link_type=abstract
Annales Geophysicae (ISSN 0755-0685), vol. 2, May-June 1984, p. 341-352. Research supported by the Centre National de la Recherc
Physics
Convection Currents, Earth Mantle, Earth Movements, Lithosphere, Subduction (Geology), Heat Flux, Mass Transfer, Rheology, Shear Stress, Temperature Distribution, Velocity Distribution, Viscosity
Scientific paper
Two-dimensional convection in a subduction zone with velocity boundary conditions is modelled, the trench moves relative to a fixed mesosphere. The creep law involved a variable transition stress between diffusional and dislocation creep. A small wedge region is decoupled from the main convection cell. Below the intra-arc basin, there is at first a warming of the lithosphere by the induced upwelling. The temperature anomaly of the subducted slab broadens gradually and produces next an inversion of temperature caused by sub-adiabatic temperature gradients. Temperature fluxes and shear stresses under the overriding plate are then constrained by this evolution. The expected effects of the discontinuous evolution of the trench-arc-basin system are inferred from these results and compared with field evidences.
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