Free-surface formulation of mantle convection-II. Implication for subduction-zone observables
نویسندگان
چکیده
منابع مشابه
Free-surface formulation of mantle convection-11. Implication for subduction-zone observables
Viscous and viscoelastic models for a subduction zone with a faulted lithosphere and internal buoyancy can self-consistently and simultaneously predict long-wavelength geoid highs over slabs, short-wavelength gravity lows over trenches, trench-forebulge morphology, and explain the high apparent strength of oceanic lithosphere in trench environments. The models use two different free-surface for...
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Geodynamic simulations increasingly rely on simulations with a true free surface to investigate questions of dynamic topography, tectonic deformation, gravity perturbations, and global mantle convection. However, implementations of free surface boundary conditions have proven challenging from a standpoint of accuracy, robustness, and stability. In particular, free surfaces tend to suffer from s...
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In mantle convection models, the top surface is traditionally approximated as a freeslip boundary, and the dynamic topography is obtained by assuming that the normal stress on the free-slip boundary is compensated instantaneously through surface deformation. It has already been shown that this approximation is valid for longwavelength topography. Based on both viscous and viscoelastic models wi...
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[1] Water enters the Earth’s mantle by subduction of oceanic lithosphere. Most of this water immediately returns to the atmosphere through arc volcanism, but a part of it is expected as deep as the mantle transition zone (410–660 km depth). There, slabs can be deflected and linger before sinking into the lower mantle. Because it lowers the density and viscosity of the transition zone minerals (...
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It is widely accepted that water-rich serpentinite domains are commonly present in the mantle above shallow subducting slabs and play key roles in controlling the geochemical cycling and physical properties of subduction zones. Thermal and petrological models show the dominant serpentine mineral is antigorite. However, there is no good consensus on the amount, distribution and alignment of this...
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ژورنال
عنوان ژورنال: Geophysical Journal International
سال: 1996
ISSN: 0956-540X
DOI: 10.1111/j.1365-246x.1996.tb04050.x